HomeMy WebLinkAboutDrainage Reports - 02/13/2020M INOR A MENDMENT - D RAINAGE L ETTER
P LATTE R IVER P OWER A UTHORITY HQ B UILDING E XPANSION
F ORT C OLLINS , CO
1501 ACADEMY CT. STE 203 | FORT COLLINS, CO 80524 | 970-530-4044 | www.unitedcivil.com
November 25, 2019
City of Fort Collins
Stormwater Utility
700 Wood Street
Fort Collins, Colorado 80521
RE: Platte River Power Authority HQ Building Addition
Fort Collins, CO
Project Number: U16014
Dear Staff:
United Civil Design Group, LLC is pleased to submit this Drainage Letter accompanying the Minor Amendment application for
the Platte River Power Authority Building Addition site in Fort Collins, Colorado. In general, this letter serves to document
the storm water impacts associated with the building addition and to confirm that the improvements conform to the
previously approved drainage study for the project.
SITE LOCATION AND PROJECT DESCRIPTION
The Platte River Power Authority Headquarters Campus (referred herein as ”the site” or “the Campus”) is a parcel of land
situated in the Southeast Quarter of Section 30, Township 7 North, Range 68 West of the 6th Principal Meridian to the City
of Fort Collins, Larimer County, Colorado. More specifically, the site is located at the northwest corner of Horsetooth Road
and Timberline Road and is bounded by East Horsetooth Road to the south, Timberline Road to the east, existing commercial
property and Danfield Court to the north, and Union Pacific Railroad right-of-way to the west.
The planned improvements to the site will consist of the following:
The expansion of the south bar of the newly constructed headquarters building.
The reconfiguration of previously designed Phase 2 improvements including hard surfaces adjacent to the building
expansion, roof drain piping systems and the detention pond located east of the proposed expansion.
The addition of an emergency access from Timberline Road to the headquarters building.
PREVIOUS REPORTS AND BACKGROUND INFORMATION
As mentioned, the drainage of the Platte River Power Authority Campus site was previously studied by United Civil with the
report entitled, “Final Drainage Report – Platte River Power Authority HQ Campus”, and dated May 23, 2018. This report
details the drainage design of site including requirements associated with detention, water quality and Low Impact
Development. Revisions to this report required for the building addition are documented in the following sections of this
letter.
PROPOSED HYDROLOGY
The building addition project does not alter overall drainage patterns for the campus and includes only minor revisions to the
hydrology of two (2) basins as shown in previously approved drainage study. The basins altered with the project include Basin
A1 and Basin C1. The table on the following page provides a summary of the proposed site characteristics relative to its
previously approved design condition.
City of Fort Collins Approved Plans
Approved by:
Date:
Matt Simpson
02/13/2020
M INOR A MENDMENT - D RAINAGE L ETTER
P LATTE R IVER P OWER A UTHORITY HQ B UILDING E XPANSION
F ORT C OLLINS , CO
1501 ACADEMY CT. STE 203 | FORT COLLINS, CO 80524 | 970-530-4044 | www.unitedcivil.com
COMPARISON SUMMARY TABLE
PRPA Campus
Previously
Approved Design Proposed Design
Overall Area (acre) 17.9 17.9
Roof (sf) 76,311 73,787
Asphalt (sf) 160,957 160,957
Concrete (sf) 116,895 125,366
Landscape (sf) 412,198 406,251
% Imperviousness 44.8% 45.5%
Note that the overall roof area has decreased from the previous design due to the removal of 8,500 sf of future building
previously assumed for the addition. The actual building addition area is currently set at approximately 5,800 sf.
DETENTION POND CONVERSION
Proposed site improvements include the expansion of the HQ building to the east and over a portion of the previously planned
detention pond (Pond A1) in that area. As a result, the overall pond volume for the site has been slightly reduced.
Additionally, due to the added impervious area, the volume required has slightly increased. The detention and water quality
volumes for the ponds were both previously planned for future improvements so neither condition negatively impacts the
overall storage or water quality volumes. The following table summarizes the revised detention pond design:
Pond
Designation
Detention
Volume
Required
(ac-ft)
Detention
Volume
Provided
(ac-ft)
100-
year
WSEL
Pond
Release
Rate
(cfs)
WQCV
Required
(ac-ft)
WQCV
Provided
(ac-ft)
Water
Quality
WSEL
Top of
Pond
Elevation
Pond A1 2.43 2.71 4952.25 3.15 0.19 0.23 4949.50 4953.25
LOW IMPACT DEVELOPMENT (LID)
The previously approved design for the campus met current City LID requirements by treating 75% of the newly added
impervious area using a combination of LID techniques including underground water quality detention, bioswales and a wet
pond. With the proposed addition, the newly added impervious area for the campus has been increased by approximately
2,800 sf from what was previously planned; all of which is located within Basin A1. The newly added impervious area for the
expansion project is not being treated with LID techniques for the following reasons:
1. The added impervious area is located within Basin A1 which was previously designed without LID improvements.
2. The majority of the drainage basins for the site (13 of 16 basins) do already include LID treatment techniques.
3. Due to proximity of the proposed improvements to existing and proposed drainage features (the wet pond and
detention pond) and the number of existing utilities in the area, the addition of new LID features adjacent to the
improvements is highly constrained. This is particularly true for the additional roof area which is being piped from
the roof directly to the detention pond.
4. Existing utilities and topography north of the addition further limit the ability to provide adequate bioretention or
underground retention facilities and limit the ability to collect the required impervious area. Additionally, due to
the proximity of the detention ponds, the elevation required to provide either type of system are limited as both
require a minimum of 30”-36” to provide for an underdrain or the below ground facilities.
5. As the improvements are adjacent to the proposed extended detention and water quality pond, all of the proposed
improvements will be treated via extended detention prior to being allowed to exit the site.
6. Due to the relatively small amount of added impervious area, the impact to the overall LID treatment percentage
for the site is relatively small, decreasing from 75% to 73%. The added impervious area would require approximately
160 cf of added LID treatment assuming a 12-hour storage time.
Refer to the LID Summary table in Appendix B for additional information and Appendix C for a copy of the Variance Request.
A PPENDIX A
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7
8
43
.
4
%
C/
D
0
.
5
2
0
.
6
5
B-
T
O
T
A
L
B
-
T
O
T
A
L
1.
8
7
8
1
,
4
8
1
-
2
9
,
5
4
7
7
,
4
9
5
-
4
4
,
4
3
9
45
.
6
%
C
/
D
0
.
5
4
0
.
6
8
C-
1
C
-
1
1.
2
8
5
5
,
6
7
0
-
6
,
0
2
0
-
4
9
,
6
5
0
11
.
5
%
C/
D
0
.
2
8
0
.
3
5
C-
T
O
T
A
L
C
-
T
O
T
A
L
1.
2
8
5
5
,
6
7
0
-
-
6
,
0
2
0
-
4
9
,
6
5
0
11
.
5
%
C
/
D
0
.
2
8
0
.
3
5
OS
-
1
O
S
-
1
0.
6
8
2
9
,
5
3
3
2
9
,
5
3
3
2.
0
%
C/
D
0
.
2
0
0
.
2
5
OS
-
2
A
O
S
-
2
A
0.
2
1
8
,
9
4
0
8
,
9
4
0
2.
0
%
C/
D
0
.
2
0
0
.
2
5
OS
-
2
B
O
S
-
2
B
0.
9
3
4
0
,
3
1
0
2
6
,
5
6
8
6
,
2
2
8
7
,
5
1
4
80
.
2
%
C/
D
0
.
8
1
1
.
0
0
OS
-
3
O
S
-
3
0.
5
1
2
2
,
1
1
5
1
5
,
3
0
9
4
,
3
2
1
2
,
4
8
5
87
.
0
%
C/
D
0
.
8
7
1
.
0
0
OS
-
4
O
S
-
4
1.
2
6
5
4
,
6
9
7
3
2
,
2
7
2
5
,
6
6
4
1
6
,
7
6
1
68
.
9
%
C/
D
0
.
7
2
0
.
9
0
OS
-
5
O
S
-
5
0.
5
4
2
3
,
6
6
8
2
3
,
6
6
8
2.
0
%
C/
D
0
.
2
0
0
.
2
5
OS
-
T
O
T
A
L
O
S
-
T
O
T
A
L
4.
1
2
1
7
9
,
2
6
3
-
7
4
,
1
4
9
1
6
,
2
1
3
-
8
8
,
9
0
1
50
.
5
%
C
/
D
0
.
5
8
0
.
7
2
17
.
5
9
7
6
6
,
3
6
1
7
3
,
7
8
7
1
6
0
,
9
5
7
1
2
5
,
3
6
6
-
4
0
6
,
2
5
1
4
5
.
5
%
C
/
D
0
.
5
5
0
.
6
9
No
t
e
s
:
(1
)
R
e
c
o
m
m
e
n
d
e
d
R
u
n
o
f
f
C
o
e
f
f
i
c
i
e
n
t
V
a
l
u
e
s
f
r
o
m
F
C
S
C
M
T
a
b
l
e
R
O
-
1
1
.
(2
)
C
o
m
p
o
s
i
t
e
R
u
n
o
f
f
C
o
e
f
f
i
c
i
e
n
t
i
s
b
a
s
e
d
o
n
F
C
S
C
M
e
q
u
a
t
i
o
n
R
O
-
8
a
n
d
C
o
e
f
f
i
c
i
e
n
t
A
d
j
u
s
t
m
e
n
t
f
a
c
t
o
r
s
p
e
r
T
a
b
l
e
R
O
-
1
2
.
(3
)
B
a
s
i
n
B
-
2
i
n
c
l
u
d
e
s
a
p
p
r
o
x
i
m
a
t
e
l
y
1
0
,
0
0
0
s
f
o
f
f
u
t
u
r
e
p
a
r
k
i
n
g
a
r
e
a
.
(4
)
B
a
s
i
n
A
-
1
2
(
F
u
t
u
r
e
)
i
s
i
n
c
l
u
d
e
d
f
o
r
s
t
o
r
m
s
e
w
e
r
s
i
z
i
n
g
o
n
l
y
a
n
d
i
s
n
o
t
i
n
c
l
u
d
e
d
w
i
t
h
i
n
"
A
-
T
O
T
A
L
"
a
b
o
v
e
.
D
e
t
e
n
t
i
o
n
a
n
d
L
I
D
r
e
q
u
i
r
e
m
e
n
t
s
w
i
l
l
b
e
r
e
q
u
i
r
e
d
f
o
r
B
a
s
i
n
A
-
1
2
w
i
t
h
f
u
t
u
r
e
d
e
v
e
l
o
p
m
e
n
t
.
Pr
o
p
o
s
e
d
T
o
t
a
l
Pr
o
p
o
s
e
d
B
a
s
i
n
s
Ar
e
a
s
Co
m
p
o
s
i
t
e
R
u
n
o
f
f
C
o
e
f
f
i
c
i
e
n
t
s
(2
)
Da
t
e
:
1
0
/
1
5
/
2
0
1
9
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
u
s
\
R
e
p
o
r
t
s
\
D
r
a
i
n
a
g
e
\
C
a
l
c
u
l
a
t
i
o
n
s
\
U
1
6
0
1
4
-
D
r
a
i
n
C
a
l
c
s
_
E
E
C
.
x
l
s
m
2-
Y
e
a
r
T
i
m
e
o
f
C
o
n
c
e
n
t
r
a
t
i
o
n
Pl
a
t
t
e
R
i
v
e
r
P
o
w
e
r
A
u
t
h
o
r
i
t
y
C
a
m
p
u
s
,
F
o
r
t
C
o
l
l
i
n
s
,
C
O
Ba
s
i
n
D
e
s
i
g
n
P
t
.
A
r
e
a
C(1
)
Le
n
g
t
h
S
l
o
p
e
ti(2
)
Le
n
g
t
h
S
l
o
p
e
C
v
Ve
l
o
c
i
t
y
(3
)
tt(4
)
Ch
e
c
k
t
c?
To
t
a
l
L
e
n
g
t
h
tc(5
)
ac
r
e
s
f
t
%
m
i
n
f
t
%
f
p
s
m
i
n
m
i
n
U
r
b
a
n
?
f
t
m
i
n
m
i
n
EX
1
E
X
1
3
.
7
5
0.
5
7
35
3.
8
%
3.
8
39
0
2.
3
%
20
3.
0
2
.
1
5
.
9
Y
e
s
4
2
5
1
2
5.
9
EX
2
E
X
2
2
.
3
8
0
.
4
4
2
7
5
0
.
6
%
2
4
.
2
1
9
0
1
.
0
%
7
0.
7
4
.
5
2
8
.
7
Y
e
s
4
6
5
1
3
12
.
6
EX
3
E
X
3
2
.
1
9
0
.
8
2
2
0
1
.
2
%
2
.
2
4
1
5
1
.
0
%
2
0
2.
0
3
.
5
5
.
7
Y
e
s
4
3
5
1
2
5.
7
EX
4
E
X
4
2
.
3
3
0
.
3
4
5
0
1
.
0
%
1
0
.
1
2
0
5
1
.
1
%
7
0.
7
4
.
7
1
4
.
7
Y
e
s
2
5
5
1
1
11
.
4
EX
5
E
X
5
1
.
3
5
0
.
2
8
1
0
5
1
.
1
%
1
5
.
2
1
3
0
0
.
1
%
7
0.
2
9
.
3
2
4
.
5
Y
e
s
2
3
5
1
1
11
.
3
OS
-
1
O
S
-
1
0
.
3
1
0
.
3
5
7
0
4
.
4
%
7
.
2
2
0
4
.
6
%
2
0
4.
3
0
.
1
7
.
3
Y
e
s
9
0
1
1
7.
3
OS
-
2
A
O
S
-
2
A
0
.
3
3
0
.
3
9
3
0
5
.
9
%
4
.
0
6
0
1
.
2
%
2
0
2.
2
0
.
5
4
.
5
Y
e
s
9
0
1
1
5.
0
OS
-
2
B
O
S
-
2
B
0
.
9
3
0
.
8
1
5
0
2
.
0
%
3
.
0
4
9
0
0
.
7
%
2
0
1.
6
5
.
1
8
.
1
Y
e
s
5
4
0
1
3
8.
1
OS
-
3
O
S
-
3
2
.
2
2
0
.
3
4
3
0
1
0
.
0
%
3
.
6
6
1
0
0
.
4
%
7
0.
4
2
3
.
0
2
6
.
6
Y
e
s
6
4
0
1
4
13
.
6
OS
-
4
O
S
-
4
1
.
2
8
0
.
7
5
6
0
5
.
0
%
3
.
0
2
5
0
1
.
1
%
2
0
2.
1
2
.
0
5
.
0
Y
e
s
3
1
0
1
2
5.
0
OS
-
5
O
S
-
5
0
.
5
4
0
.
2
0
3
0
1
0
.
0
%
4
.
3
2
0
0
0
.
7
%
7
0.
6
5
.
7
1
0
.
0
Y
e
s
2
3
0
1
1
10
.
0
No
t
e
s
:
(1
)
C
=
C
x*C
f
(2
)
ti =
[
1
.
8
7
(
1
.
1
-
C
xCf)L
1/
2
]/
S
1/
3
,
S
=
s
l
o
p
e
i
n
%
,
L
=
l
e
n
g
t
h
o
f
o
v
e
r
l
a
n
d
f
l
o
w
(
4
0
0
'
m
a
x
)
(3
)
V=
C
vS0.
5
,
S
=
w
a
t
e
r
c
o
u
r
s
e
s
l
o
p
e
i
n
f
t
/
f
t
,
U
D
F
C
D
E
q
u
a
t
i
o
n
R
O
-
4
(4
)
tt=L
/
(
V
*
6
0
s
e
c
/
m
i
n
)
(5
)
tc c
h
e
c
k
(
f
o
r
u
r
b
a
n
o
r
d
e
v
e
l
o
p
e
d
a
r
e
a
s
o
n
l
y
)
=
t
o
t
a
l
l
e
n
g
t
h
/
1
8
0
+
1
0
(6
)
mi
n
t
c =
5
m
i
n
Ex
i
s
t
i
n
g
B
a
s
i
n
s
In
i
t
i
a
l
O
v
e
r
l
a
n
d
F
l
o
w
T
i
m
e
(
t
i)
Tr
a
v
e
l
/
C
h
a
n
n
e
l
i
z
e
d
T
i
m
e
o
f
F
l
o
w
(
t
t)
ti+t
t
tc
Ch
e
c
k
f
o
r
U
r
b
a
n
i
z
e
d
B
a
s
i
n
s
Fi
n
a
l
tc(6
)
Da
t
e
:
1
0
/
1
5
/
2
0
1
9
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
u
s
\
R
e
p
o
r
t
s
\
D
r
a
i
n
a
g
e
\
C
a
l
c
u
l
a
t
i
o
n
s
\
U
1
6
0
1
4
-
D
r
a
i
n
C
a
l
c
s
_
E
E
C
.
x
l
s
m
2-
Y
e
a
r
T
i
m
e
o
f
C
o
n
c
e
n
t
r
a
t
i
o
n
Pl
a
t
t
e
R
i
v
e
r
P
o
w
e
r
A
u
t
h
o
r
i
t
y
C
a
m
p
u
s
,
F
o
r
t
C
o
l
l
i
n
s
,
C
O
Ba
s
i
n
D
e
s
i
g
n
P
t
.
A
r
e
a
C(1
)
Le
n
g
t
h
S
l
o
p
e
ti(2
)
Le
n
g
t
h
S
l
o
p
e
C
v
Ve
l
o
c
i
t
y
(3
)
tt(4
)
Ch
e
c
k
t
c?
To
t
a
l
L
e
n
g
t
h
tc(5
)
ac
r
e
s
f
t
%
m
i
n
f
t
%
f
p
s
m
i
n
m
i
n
U
r
b
a
n
?
f
t
m
i
n
m
i
n
A-
1
A
-
1
3
.
3
3
0.
3
6
23
5
1.
5
%
18
.
6
46
5
0.
5
%
20
1.
4
5
.
5
2
4
.
0
Y
e
s
7
0
0
1
4
13
.
9
A-
2
A
-
2
0
.
9
1
0
.
8
3
1
0
2
.
0
%
1
.
2
8
3
0
5
0
.
5
%
2
0
1.
4
3
.
6
4
.
9
Y
e
s
3
1
5
1
2
5.
0
A-
3
A
-
3
0
.
3
7
0
.
9
5
5
0
1
2
.
5
%
0
.
8
6
1
5
3
0
.
0
%
2
0
11
.
0
0
.
0
0
.
9
Y
e
s
6
5
1
0
5.
0
A-
4
A
-
4
0
.
5
7
0
.
8
6
3
6
2
.
0
%
2
.
1
2
2
4
2
2
.
0
%
2
0
2.
8
1
.
4
3
.
5
Y
e
s
2
7
8
1
2
5.
0
A-
5
A
-
5
0
.
4
0
0
.
8
4
5
0
2
.
0
%
2
.
7
6
1
3
3
1
.
5
%
2
0
2.
4
0
.
9
3
.
7
Y
e
s
1
8
3
1
1
5.
0
A-
6
A
-
6
0
.
5
1
0
.
6
4
1
7
2
.
0
%
2
.
8
5
1
2
3
2
.
0
%
2
0
2.
8
0
.
7
3
.
6
Y
e
s
1
4
0
1
1
5.
0
A-
7
A
-
7
0
.
3
2
0
.
6
3
6
4
1
.
5
%
6
.
1
2
2
1
0
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.
0
%
1
5
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5
2
.
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5
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e
s
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7
4
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2
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5
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8
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8
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2
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0
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4
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5
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0
%
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0
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0
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8
0
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3
2
.
4
Y
e
s
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5
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0
5.
0
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9
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9
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6
4
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9
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5
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2
.
5
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6
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2
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0
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4
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1
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e
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0
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6
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9
2
6
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4
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0
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6
7
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0
0
1
.
5
%
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0
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4
1
.
4
3
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0
Y
e
s
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1
1
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0
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1
1
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1
1
0
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9
7
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4
1
2
0
7
.
0
%
3
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0
3
1
9
0
0
.
5
%
1
5
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1
3
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0
6
.
0
Y
e
s
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1
0
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1
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0
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1
2
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-
1
2
1
.
1
5
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2
3
2
0
7
.
0
%
3
.
8
1
2
0
5
0
.
5
%
1
5
1.
1
3
.
2
7
.
0
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e
s
2
2
5
1
1
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0
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1
2
(
F
u
t
u
r
e
)
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-
1
2
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u
t
u
r
e
)
1
.
1
5
0
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8
7
1
0
2
.
0
%
1
.
0
7
2
0
5
2
.
0
%
2
0
2.
8
1
.
2
2
.
3
Y
e
s
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1
5
1
1
5.
0
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1
3
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-
1
3
0
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2
6
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9
5
7
2
1
2
.
5
%
1
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0
3
1
5
3
0
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0
%
2
0
11
.
0
0
.
0
1
.
1
Y
e
s
8
7
1
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0
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T
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T
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L
A
-
T
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T
A
L
1
0
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3
3
0
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5
8
5
1
1
.
5
%
6
.
1
0
9
8
5
0
.
4
%
2
0
1.
3
1
3
.
0
1
9
.
1
Y
e
s
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0
3
6
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6
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5
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8
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1
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1
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4
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6
1
7
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0
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0
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4
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.
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0
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8
0
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2
6
.
3
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e
s
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1
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3
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2
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-
2
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.
4
5
0
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5
2
5
0
2
5
.
0
%
2
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5
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9
0
0
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5
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1
5
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1
4
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2
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s
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4
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2
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T
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L
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L
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.
8
7
0
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5
4
5
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2
5
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0
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.
5
6
2
9
0
0
.
5
%
1
5
1.
1
4
.
6
7
.
1
Y
e
s
3
4
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1
2
7
.
1
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1
C
-
1
1
.
2
8
0
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2
8
1
6
2
.
0
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4
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8
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5
1
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0
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7
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3
5
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1
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e
s
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1
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T
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T
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L
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T
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1
.
2
8
0
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2
8
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6
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.
0
%
4
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8
7
7
5
1
0
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0
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5
4.
7
0
.
3
5
.
1
Y
e
s
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1
1
1
5
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1
OS
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O
S
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1
0
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6
8
0
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2
0
7
0
4
.
4
%
8
.
6
4
2
0
4
.
6
%
2
0
4.
3
0
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1
8
.
7
Y
e
s
9
0
1
1
8.
7
OS
-
2
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O
S
-
2
A
0
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2
1
0
.
2
0
3
0
5
.
9
%
5
.
1
3
6
0
1
.
2
%
2
0
2.
2
0
.
5
5
.
6
Y
e
s
9
0
1
1
5.
6
OS
-
2
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O
S
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2
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0
.
9
3
0
.
8
1
5
0
2
.
0
%
3
.
0
5
4
9
0
0
.
7
%
2
0
1.
6
5
.
1
8
.
1
Y
e
s
5
4
0
1
3
8.
1
OS
-
3
O
S
-
3
0
.
5
1
0
.
8
7
1
4
0
1
.
5
%
4
.
5
3
1
6
5
0
.
7
%
2
0
1.
7
1
.
6
6
.
2
Y
e
s
3
0
5
1
2
6.
2
OS
-
4
O
S
-
4
1
.
2
6
0
.
7
2
6
0
5
.
0
%
3
.
2
3
2
5
0
1
.
1
%
2
0
2.
1
2
.
0
5
.
2
Y
e
s
3
1
0
1
2
5.
2
OS
-
5
O
S
-
5
0
.
5
4
0
.
2
0
3
0
1
0
.
0
%
4
.
3
1
2
0
0
0
.
7
%
7
0.
6
5
.
7
1
0
.
0
Y
e
s
2
3
0
1
1
10
.
0
No
t
e
s
:
(1
)
C
=
C
x*C
f
(2
)
ti =
[
1
.
8
7
(
1
.
1
-
C
xCf)L
1/
2
]/
S
1/
3
,
S
=
s
l
o
p
e
i
n
%
,
L
=
l
e
n
g
t
h
o
f
o
v
e
r
l
a
n
d
f
l
o
w
(
4
0
0
'
m
a
x
)
(3
)
V=
C
vS0.
5
,
S
=
w
a
t
e
r
c
o
u
r
s
e
s
l
o
p
e
i
n
f
t
/
f
t
,
U
D
F
C
D
E
q
u
a
t
i
o
n
R
O
-
4
(4
)
tt=L
/
(
V
*
6
0
s
e
c
/
m
i
n
)
(5
)
tc c
h
e
c
k
(
f
o
r
u
r
b
a
n
o
r
d
e
v
e
l
o
p
e
d
a
r
e
a
s
o
n
l
y
)
=
t
o
t
a
l
l
e
n
g
t
h
/
1
8
0
+
1
0
(6
)
mi
n
t
c =
5
m
i
n
Pr
o
p
o
s
e
d
B
a
s
i
n
s
In
i
t
i
a
l
O
v
e
r
l
a
n
d
F
l
o
w
T
i
m
e
(
t
i)
Tr
a
v
e
l
/
C
h
a
n
n
e
l
i
z
e
d
T
i
m
e
o
f
F
l
o
w
(
t
t)
ti+t
t
tc
Ch
e
c
k
f
o
r
U
r
b
a
n
i
z
e
d
B
a
s
i
n
s
Fi
n
a
l
tc(6
)
Da
t
e
:
1
0
/
1
5
/
2
0
1
9
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
u
s
\
R
e
p
o
r
t
s
\
D
r
a
i
n
a
g
e
\
C
a
l
c
u
l
a
t
i
o
n
s
\
U
1
6
0
1
4
-
D
r
a
i
n
C
a
l
c
s
_
E
E
C
.
x
l
s
m
10
0
-
Y
e
a
r
T
i
m
e
o
f
C
o
n
c
e
n
t
r
a
t
i
o
n
Pl
a
t
t
e
R
i
v
e
r
P
o
w
e
r
A
u
t
h
o
r
i
t
y
C
a
m
p
u
s
,
F
o
r
t
C
o
l
l
i
n
s
,
C
O
Ba
s
i
n
D
e
s
i
g
n
P
t
.
A
r
e
a
C(1
)
Le
n
g
t
h
S
l
o
p
e
ti(2
)
Le
n
g
t
h
S
l
o
p
e
C
v
Ve
l
o
c
i
t
y
(3
)
tt(4
)
Ch
e
c
k
t
c?
To
t
a
l
L
e
n
g
t
h
tc(5
)
ac
r
e
s
f
t
%
m
i
n
f
t
%
f
p
s
m
i
n
m
i
n
U
r
b
a
n
?
f
t
m
i
n
m
i
n
EX
1
E
X
1
3
.
7
5
0.
7
1
35
3.
8
%
2.
8
39
0
2.
3
%
20
3.
0
2
.
1
4
.
9
Y
e
s
4
2
5
1
2
5.
0
EX
2
E
X
2
2
.
3
8
0
.
5
5
2
7
5
0
.
6
%
2
0
.
2
1
9
0
1
.
0
%
7
0.
7
4
.
5
2
4
.
7
Y
e
s
4
6
5
1
3
12
.
6
EX
3
E
X
3
2
.
1
9
1.
0
0
20
1.
2
%
0.
8
41
5
1.
0
%
20
2.
0
3
.
5
4
.
2
Y
e
s
4
3
5
1
2
5.
0
EX
4
E
X
4
2
.
3
3
0
.
4
2
5
0
1
.
0
%
8
.
9
2
0
5
1
.
1
%
7
0.
7
4
.
7
1
3
.
6
Y
e
s
2
5
5
1
1
11
.
4
EX
5
E
X
5
1
.
3
5
0.
3
5
10
5
1.
1
%
13
.
9
13
0
0.
1
%
7
0.
2
9
.
3
2
3
.
2
Y
e
s
2
3
5
1
1
11
.
3
OS
-
1
O
S
-
1
0
.
3
1
0.
4
3
70
4.
4
%
6.
4
20
4.
6
%
20
4.
3
0
.
1
6
.
5
Y
e
s
9
0
1
1
6.
5
OS
-
2
A
O
S
-
2
A
0
.
3
3
0
.
4
9
3
0
5
.
9
%
3
.
5
6
0
1
.
2
%
2
0
2.
2
0
.
5
3
.
9
Y
e
s
9
0
1
1
5.
0
OS
-
2
B
O
S
-
2
B
0
.
9
3
1.
0
0
50
2.
0
%
1.
1
49
0
0.
7
%
20
1.
6
5
.
1
6
.
1
Y
e
s
5
4
0
1
3
6.
1
OS
-
3
O
S
-
3
2
.
2
2
0
.
4
3
3
0
1
0
.
0
%
3
.
2
6
1
0
0
.
4
%
7
0.
4
2
3
.
0
2
6
.
2
Y
e
s
6
4
0
1
4
13
.
6
OS
-
4
O
S
-
4
1
.
2
8
0.
9
3
60
5.
0
%
1.
4
25
0
1.
1
%
20
2.
1
2
.
0
3
.
4
Y
e
s
3
1
0
1
2
5.
0
OS
-
5
O
S
-
5
0
.
5
4
0
.
2
5
3
0
1
0
.
0
%
4
.
1
2
0
0
0
.
7
%
7
0.
6
5
.
7
9
.
8
Y
e
s
2
3
0
1
1
9.
8
No
t
e
s
:
(1
)
C
=
C
x*C
f
(2
)
ti =
[
1
.
8
7
(
1
.
1
-
C
xCf)L
1/
2
]/
S
1/
3
,
S
=
s
l
o
p
e
i
n
%
,
L
=
l
e
n
g
t
h
o
f
o
v
e
r
l
a
n
d
f
l
o
w
(
4
0
0
'
m
a
x
)
(3
)
V=
C
vS0.
5
,
S
=
w
a
t
e
r
c
o
u
r
s
e
s
l
o
p
e
i
n
f
t
/
f
t
,
U
D
F
C
D
E
q
u
a
t
i
o
n
R
O
-
4
(4
)
tt=L
/
(
V
*
6
0
s
e
c
/
m
i
n
)
(5
)
tc c
h
e
c
k
(
f
o
r
u
r
b
a
n
o
r
d
e
v
e
l
o
p
e
d
a
r
e
a
s
o
n
l
y
)
=
t
o
t
a
l
l
e
n
g
t
h
/
1
8
0
+
1
0
(6
)
mi
n
t
c =
5
m
i
n
Ex
i
s
t
i
n
g
B
a
s
i
n
s
ti+t
t
Fi
n
a
l
tc(6
)
tc
Ch
e
c
k
f
o
r
U
r
b
a
n
i
z
e
d
B
a
s
i
n
s
In
i
t
i
a
l
O
v
e
r
l
a
n
d
F
l
o
w
T
i
m
e
(
t
i)
Tr
a
v
e
l
/
C
h
a
n
n
e
l
i
z
e
d
T
i
m
e
o
f
F
l
o
w
(
t
t)
Da
t
e
:
1
0
/
1
5
/
2
0
1
9
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
u
s
\
R
e
p
o
r
t
s
\
D
r
a
i
n
a
g
e
\
C
a
l
c
u
l
a
t
i
o
n
s
\
U
1
6
0
1
4
-
D
r
a
i
n
C
a
l
c
s
_
E
E
C
.
x
l
s
m
10
0
-
Y
e
a
r
T
i
m
e
o
f
C
o
n
c
e
n
t
r
a
t
i
o
n
Pl
a
t
t
e
R
i
v
e
r
P
o
w
e
r
A
u
t
h
o
r
i
t
y
C
a
m
p
u
s
,
F
o
r
t
C
o
l
l
i
n
s
,
C
O
Ba
s
i
n
D
e
s
i
g
n
P
t
.
A
r
e
a
C(1
)
Le
n
g
t
h
S
l
o
p
e
ti(2
)
Le
n
g
t
h
S
l
o
p
e
C
v
Ve
l
o
c
i
t
y
(3
)
tt(4
)
Ch
e
c
k
t
c?
To
t
a
l
L
e
n
g
t
h
tc(5
)
ac
r
e
s
f
t
%
m
i
n
f
t
%
f
p
s
m
i
n
m
i
n
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r
b
a
n
?
f
t
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1
3
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3
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4
5
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5
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5
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3
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5
%
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4
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e
s
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5
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12
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7
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6
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7
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8
No
t
e
s
:
(1
)
C
=
C
x*C
f
(2
)
ti =
[
1
.
8
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(
1
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1
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C
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1/
2
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3
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S
=
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,
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=
l
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4
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5
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D
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t
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4
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tt=L
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(
V
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6
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m
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tc c
h
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c
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(
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)
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t
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t
a
l
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n
g
t
h
/
1
8
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+
1
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(6
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mi
n
t
c =
5
m
i
n
Pr
o
p
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d
B
a
s
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n
s
In
i
t
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a
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d
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l
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t
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T
i
m
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f
F
l
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t
t)
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t
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r
b
a
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d
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n
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tc(6
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t
e
:
1
0
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1
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2
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1
9
P:
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U
1
6
0
1
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a
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t
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a
m
p
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o
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t
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s
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r
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mi
n
m
i
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h
r
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f
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EX
1
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1
3
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7
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6
5
0
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5
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7
1
2
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6
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2
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2
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3
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3
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4
4
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5
5
1
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3
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4
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4
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Ex
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B
a
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T
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Ru
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Da
t
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:
1
0
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1
5
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2
0
1
9
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\
U
1
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tc
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n
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A PPENDIX B
D ETENTION AND W ATER Q UALITY C ALCULATIONS
Dention Pond Volume (FAA Method)
Platte River Power Authority Campus, Fort Collins, CO
POND ID:POND A1
100 Year Storm Into Detention Facility
Area =580,678 square feet
Area =13.33 acres
C 100 = 0.73
Q 100 = 59.59 cfs (Total flows from Basins A and B)
Release Rate Out of Pond
Q OUT = 3.15 cfs
Unit Flow =0.24 cfs/acre
T C =15.8 minutes
Notes:
1. Release Rate limited by the existing 12" outfall capacity in Timberline Road.
2. Pond area includes all of Basins A, B and OS-2 but excludes "Basin A-12 (Future)".
Detention Volume Calculations
Rainfall Rainfall Inflow Rate Inflow Volume Adjustment Average Outflow Volume Required
Duration (T) Intensity (I) Qin 100*Area*I Vi=(Qin*T*60) Factor Outflow Rate Vo=Qav*T *60 Storage Volume
m= 0.5(1 + Tc/T) Qav = m*Qout Vs=Vi-Vo
min in/hr cfs ft 3 cfs ft 3 ft 3
5 9.95 96.5 28,962 1.00 3.15 945 28,017
10 7.72 74.9 44,943 1.00 3.15 1,890 43,053
15 6.52 63.3 56,935 1.00 3.15 2,835 54,100
20 5.60 54.3 65,202 1.00 3.15 3,780 61,422
25 4.98 48.3 72,479 1.00 3.15 4,725 67,754
30 4.52 43.9 78,941 1.00 3.15 5,670 73,271
35 4.08 39.6 83,132 1.00 3.15 6,615 76,517
40 3.74 36.3 87,091 1.00 3.15 7,560 79,531
45 3.46 33.6 90,642 1.00 3.15 8,505 82,137
50 3.23 31.3 94,019 1.00 3.15 9,450 84,569
55 3.03 29.4 97,017 1.00 3.15 10,395 86,622
60 2.86 27.7 99,898 1.00 3.15 11,340 88,558
70 2.59 25.1 105,545 1.00 3.15 13,230 92,315
80 2.38 23.1 110,843 1.00 3.15 15,120 95,723
90 2.21 21.4 115,791 1.00 3.15 17,010 98,781
100 2.06 20.0 119,925 1.00 3.15 18,900 101,025
110 1.94 18.8 124,233 1.00 3.15 20,790 103,443
120 1.84 17.9 128,541 1.00 3.15 22,680 105,861
Required Detention Volume
V 100 = 105,861 cubic feet
V 100 = 2.43 acre-ft
Date: 10/15/2019 P:\U16014 - PRPA Campus\Reports\Drainage\Calculations\U16014-Drain Calcs_EEC.xlsm
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4
0
1%
A-
1
3
1
1
,
5
1
7
No
n
e
-
0%
B-
1
1
0
,
1
2
5
Bi
o
s
w
a
l
e
1
0
,
1
2
5
4%
B-
2
2
6
,
9
1
7
Bi
o
s
w
a
l
e
(3
)
26
,
9
1
7
10
%
C-
1
6
,
0
2
0
We
t
P
o
n
d
6
,
0
2
0
2%
To
t
a
l
S
i
t
e
26
6
,
5
4
2
1
9
3
,
9
1
8
73
%
(1
)
B
a
s
i
n
A
-
1
e
x
c
l
u
d
e
s
a
p
p
r
o
x
i
m
a
t
e
l
y
3
,
2
0
0
s
f
o
f
b
u
i
l
d
i
n
g
a
n
d
c
o
n
c
r
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t
e
a
r
e
a
t
h
a
t
e
x
i
s
t
e
d
p
r
i
o
r
t
o
t
h
e
c
a
m
p
u
s
r
e
d
e
v
e
l
o
p
m
e
n
t
.
(2
)
B
a
s
i
n
A
-
1
2
F
u
t
u
r
e
w
i
l
l
b
e
r
e
q
u
i
r
e
d
t
o
p
r
o
v
i
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L
I
D
t
r
e
a
t
m
e
n
t
a
t
t
i
m
e
o
f
f
u
t
u
r
e
d
e
v
e
l
o
p
m
e
n
t
(3
)
B
a
s
i
n
B
-
2
i
n
c
l
u
d
e
s
1
0
,
0
0
0
s
f
o
f
f
u
t
u
r
e
t
r
e
a
t
e
d
a
r
e
a
b
y
t
h
e
f
u
t
u
r
e
e
x
t
e
n
s
i
o
n
o
f
t
h
e
p
r
o
p
o
s
e
d
b
i
o
s
w
a
l
e
Lo
w
I
m
p
a
c
t
D
e
v
e
l
o
p
m
e
n
t
(
L
I
D
)
T
r
e
a
t
e
d
A
r
e
a
s
Ca
l
c
u
l
a
t
i
o
n
s
b
y
:
K
R
B
Da
t
e
:
1
0
/
1
5
/
2
0
1
9
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
u
s
\
R
e
p
o
r
t
s
\
D
r
a
i
n
a
g
e
\
C
a
l
c
u
l
a
t
i
o
n
s
\
U
1
6
0
1
4
-
D
r
a
i
n
C
a
l
c
s
_
E
E
C
.
x
l
s
m
STAGE STORAGE TABLE
ELEV
AREA
(sq. ft.)
DEPTH
(ft)
AVG END
INC. VOL.
(cu. ft.)
AVG END
TOTAL VOL.
(cu. ft.)
CONIC
INC. VOL.
(cu. ft.)
CONIC
TOTAL VOL.
(cu. ft.)
4,948.200 188.23 N/A N/A 0.00 N/A 0.00
4,948.400 1,037.66 0.200 122.59 122.59 111.19 111.19
4,948.600 2,931.58 0.200 396.92 519.51 380.89 492.08
4,948.800 5,765.90 0.200 869.75 1389.26 853.92 1346.00
4,949.000 9,301.26 0.200 1506.72 2895.98 1492.69 2838.70
4,949.200 12,888.17 0.200 2218.94 5114.92 2209.21 5047.91
4,949.400 16,487.21 0.200 2937.54 8052.46 2930.16 7978.07
4,949.600 20,423.50 0.200 3691.07 11743.53 3684.05 11662.13
4,949.800 23,793.84 0.200 4421.73 16165.26 4417.45 16079.57
4,950.000 26,925.84 0.200 5071.97 21237.23 5068.74 21148.31
4,950.200 29,934.56 0.200 5686.04 26923.27 5683.39 26831.70
4,950.400 32,392.72 0.200 6232.73 33156.00 6231.11 33062.81
4,950.600 34,097.07 0.200 6648.98 39804.98 6648.25 39711.06
4,950.800 35,422.51 0.200 6951.96 46756.93 6951.54 46662.60
4,951.000 36,392.35 0.200 7181.49 53938.42 7181.27 53843.87
4,951.200 37,318.53 0.200 7371.09 61309.51 7370.89 61214.76
4,951.400 38,267.07 0.200 7558.56 68868.07 7558.36 68773.12
4,951.600 39,241.04 0.200 7750.81 76618.88 7750.61 76523.73
4,951.800 40,246.81 0.200 7948.78 84567.66 7948.57 84472.30
4,952.000 41,385.33 0.200 8163.21 92730.88 8162.95 92635.25
4,952.200 42,668.52 0.200 8405.38 101136.26 8405.06 101040.31
4,952.400 42,816.19 0.200 8548.47 109684.73 8548.47 109588.77
103,177 cf @ 4952.25
24,764 cf @ 4952.25
136,451 cf total volume (2.96 ac-ft)
2.43 ac-ft required for detention
(2.71 ac-ft provided)
0.19 ac-ft required for water quality
(0.24 ac-ft provided)
SMALL POND
ELEV
AREA
(sq. ft.)
DEPTH
(ft)
AVG END
INC. VOL.
(cu. ft.)
AVG END
TOTAL VOL.
(cu. ft.)
CONIC
INC. VOL.
(cu. ft.)
CONIC
TOTAL VOL.
(cu. ft.)
4,949.000 1.33 N/A N/A 0.00 N/A 0.00
4,949.200 192.84 0.200 19.42 19.42 14.01 14.01
4,949.400 1,025.70 0.200 121.85 141.27 110.89 124.90
4,949.600 2,391.16 0.200 341.69 482.96 332.20 457.09
4,949.800 4,180.67 0.200 657.18 1140.14 648.90 1106.00
4,950.000 5,923.45 0.200 1010.41 2150.55 1005.36 2111.36
4,950.200 7,238.27 0.200 1316.17 3466.72 1313.98 3425.34
4,950.400 8,208.17 0.200 1544.64 5011.37 1543.63 4968.97
4,950.600 8,963.94 0.200 1717.21 6728.58 1716.66 6685.62
4,950.800 9,577.86 0.200 1854.18 8582.76 1853.84 8539.47
4,951.000 10,109.16 0.200 1968.70 10551.46 1968.46 10507.93
4,951.200 10,580.66 0.200 2068.98 12620.44 2068.80 12576.73
4,951.400 11,001.73 0.200 2158.24 14778.68 2158.10 14734.83
4,951.600 11,381.33 0.200 2238.31 17016.99 2238.20 16973.03
4,951.800 11,742.83 0.200 2312.42 19329.40 2312.32 19285.35
4,952.000 12,110.39 0.200 2385.32 21714.73 2385.23 21670.58
4,952.200 12,484.28 0.200 2459.47 24174.19 2459.37 24129.96
4,952.400 12,864.71 0.200 2534.90 26709.09 2534.80 26664.76
4,952.600 13,251.46 0.200 2611.62 29320.71 2611.52 29276.28
4,952.800 13,645.14 0.200 2689.66 32010.37 2689.56 31965.85
A PPENDIX C
R EFERENCED M ATERIALS
1501 Academy Ct. Ste. 203 Fort Collins, Colorado 80524 (970) 530-4044
Final Drainage Report
Platte River Power Authority HQ
Campus
Fort Collins, CO
Prepared for:
Platte River Power Authority
2000 East Horsetooth Road
Fort Collins, CO 80525
May 23, 2018
APPENDIX A
Hydrology Computations
Ru
n
o
f
f
C
o
e
f
f
i
c
i
e
n
t
s
a
n
d
%
I
m
p
e
r
v
i
o
u
s
Pl
a
t
t
e
R
i
v
e
r
P
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u
t
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o
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y
C
a
m
p
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s
,
F
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t
C
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,
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s
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e
s
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n
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t
.
C
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p
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e
N
R
C
S
S
o
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l
To
t
a
l
T
o
t
a
l
Ro
o
f
(1
)
As
p
h
a
l
t
Co
n
c
r
e
t
e
(1
)
Gr
a
v
e
l
(1
)
La
w
n
s
(1
)
Im
p
e
r
v
i
o
u
s
n
e
s
s
T
y
p
e
C2
C10
0
%I
=
9
0
%
%
I
=
1
0
0
%
%
I
=
9
0
%
%
I
=
4
0
%
%
I
=
2
%
(
%
I
)
ac
r
e
s
s
f
sf
s
f
s
f
s
f
s
f
EX
1
E
X
1
3.
7
5
1
6
3
,
5
5
3
1
9
,
3
7
0
5
1
,
6
2
7
8
,
6
2
7
2
,
6
7
0
8
1
,
2
5
9
48
.
6
%
C/
D
0
.
5
7
0
.
7
1
EX
2
E
X
2
2.
3
8
1
0
3
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4
8
5
2
,
8
8
3
2
2
,
0
3
3
7
,
5
0
6
1
,
7
6
7
6
9
,
2
9
6
32
.
3
%
C/
D
0
.
4
4
0
.
5
5
EX
3
E
X
3
2.
1
9
9
5
,
2
3
3
1
7
,
6
8
3
5
4
,
4
0
8
6
,
1
0
4
1
,
0
2
9
1
6
,
0
0
9
80
.
4
%
C/
D
0
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8
2
1
.
0
0
EX
4
E
X
4
2.
3
3
1
0
1
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3
2
5
9
,
0
1
2
5
,
2
0
8
4
,
3
1
6
8
1
0
8
1
,
9
7
9
18
.
9
%
C/
D
0
.
3
4
0
.
4
2
EX
5
E
X
5
1.
3
5
5
8
,
6
5
2
1
6
,
1
9
4
4
2
,
4
5
8
12
.
5
%
C/
D
0
.
2
8
0
.
3
5
OS
-
1
O
S
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1
0.
3
1
1
3
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4
0
9
9
2
8
3
4
3
3
,
3
3
1
8
,
8
0
7
20
.
5
%
C/
D
0
.
3
5
0
.
4
3
OS
-
2
A
O
S
-
2
A
0.
3
3
1
4
,
3
0
2
2
,
5
3
9
1
,
1
7
7
1
0
,
5
8
6
26
.
6
%
C/
D
0
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3
9
0
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4
9
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-
2
B
O
S
-
2
B
0.
9
3
4
0
,
3
1
0
2
6
,
5
6
8
6
,
2
2
8
7
,
5
1
4
80
.
2
%
C/
D
0
.
8
1
1
.
0
0
OS
-
3
O
S
-
3
2.
2
2
9
6
,
5
7
6
1
4
,
3
8
6
4
,
1
1
0
7
8
,
0
8
0
20
.
3
%
C/
D
0
.
3
4
0
.
4
3
OS
-
4
O
S
-
4
1.
2
8
5
5
,
8
4
6
3
8
,
6
8
2
2
,
0
6
1
1
5
,
1
0
3
73
.
1
%
C/
D
0
.
7
5
0
.
9
3
OS
-
5
O
S
-
5
0.
5
4
2
3
,
6
6
8
2
3
,
6
6
8
2.
0
%
C/
D
0
.
2
0
0
.
2
5
17
.
5
9
7
6
6
,
3
6
1
4
8
,
9
4
8
2
1
6
,
3
7
9
4
0
,
4
7
2
2
5
,
8
0
1
4
3
4
,
7
6
1
4
1
.
2
%
C
/
D
0
.
5
1
0
.
6
4
No
t
e
s
:
(1
)
R
e
c
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m
m
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d
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d
R
u
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o
f
f
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f
f
i
c
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t
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a
l
u
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s
f
r
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m
F
C
S
C
M
T
a
b
l
e
R
O
-
1
1
.
(2
)
C
o
m
p
o
s
i
t
e
R
u
n
o
f
f
C
o
e
f
f
i
c
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n
t
i
s
b
a
s
e
d
o
n
F
C
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C
M
e
q
u
a
t
i
o
n
R
O
-
8
a
n
d
C
o
e
f
f
i
c
i
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n
t
A
d
j
u
s
t
m
e
n
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f
a
c
t
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s
p
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r
T
a
b
l
e
R
O
-
1
2
.
Co
m
p
o
s
i
t
e
R
u
n
o
f
f
C
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f
f
i
c
i
e
n
t
s
(2
)
Ar
e
a
s
Ex
i
s
t
i
n
g
B
a
s
i
n
s
Ex
i
s
t
i
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g
T
o
t
a
l
Da
t
e
:
4
/
9
/
2
0
1
8
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
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s
\
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p
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s
\
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r
a
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\
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1
6
0
1
4
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r
a
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a
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.
x
l
s
m
Ru
n
o
f
f
C
o
e
f
f
i
c
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e
n
t
s
a
n
d
%
I
m
p
e
r
v
i
o
u
s
Pl
a
t
t
e
R
i
v
e
r
P
o
w
e
r
A
u
t
h
o
r
i
t
y
C
a
m
p
u
s
,
F
o
r
t
C
o
l
l
i
n
s
,
C
O
Ba
s
i
n
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e
s
i
g
n
P
t
.
C
o
m
p
o
s
i
t
e
N
R
C
S
S
o
i
l
To
t
a
l
T
o
t
a
l
Ro
o
f
(1
)
As
p
h
a
l
t
Co
n
c
r
e
t
e
(1
)
Gr
a
v
e
l
(1
)
La
w
n
s
(1
)
Im
p
e
r
v
i
o
u
s
n
e
s
s
T
y
p
e
C2
C10
0
ac
r
e
s
s
f
%I
=
9
0
%
%
I
=
1
0
0
%
%
I
=
9
0
%
%
I
=
4
0
%
%
I
=
2
%
(
%
I
)
sf
s
f
s
f
s
f
s
f
A-
1
A
-
1
3.
3
4
1
4
5
,
5
9
4
1
1
,
0
2
9
-
1
1
,
4
1
0
-
1
2
3
,
1
5
5
15
.
6
%
C/
D
0
.
3
2
0
.
3
9
A-
2
A
-
2
0.
9
1
3
9
,
8
2
4
-
2
6
,
6
9
1
6
,
6
0
4
-
6
,
5
2
9
82
.
3
%
C/
D
0
.
8
3
1
.
0
0
A-
3
A
-
3
0.
3
7
1
6
,
2
4
2
1
6
,
2
4
2
-
-
-
-
90
.
0
%
C/
D
0
.
9
5
1
.
0
0
A-
4
A
-
4
0.
5
7
2
4
,
6
8
1
3
,
1
9
9
1
6
,
7
3
9
1
,
8
7
3
-
2
,
8
7
0
86
.
5
%
C/
D
0
.
8
6
1
.
0
0
A-
5
A
-
5
0.
4
0
1
7
,
3
4
4
-
1
3
,
8
3
1
9
0
5
-
2
,
6
0
8
84
.
7
%
C/
D
0
.
8
4
1
.
0
0
A-
6
A
-
6
0.
5
1
2
2
,
2
9
4
1
1
7
-
1
2
,
8
4
4
-
9
,
3
3
3
53
.
2
%
C/
D
0
.
6
4
0
.
8
0
A-
7
A
-
7
0.
3
2
1
4
,
0
1
0
7
,
9
6
5
-
1
0
6
-
5
,
9
3
9
52
.
7
%
C/
D
0
.
6
3
0
.
7
9
A-
8
A
-
8
0.
2
1
9
,
0
9
7
3
,
3
0
8
3
,
2
3
1
-
2
,
5
5
8
65
.
3
%
C/
D
0
.
7
4
0
.
9
2
A-
9
A
-
9
0.
6
4
2
8
,
0
4
6
5
,
8
2
6
-
2
2
,
2
0
0
-
2
0
89
.
9
%
C/
D
0
.
9
5
1
.
0
0
A-
1
0
A
-
1
0
0.
6
8
2
9
,
5
0
4
5
,
8
7
2
-
2
2
,
5
2
1
-
1
,
1
1
1
86
.
7
%
C/
D
0
.
9
2
1
.
0
0
A-
1
1
A
-
1
1
0.
9
7
4
2
,
1
8
6
1
1
,
2
3
5
-
6
0
3
-
3
0
,
3
4
8
26
.
7
%
C/
D
0
.
4
1
0
.
5
1
A-
1
2
A
-
1
2
1.
1
5
5
0
,
0
2
0
-
-
2
,
2
4
0
-
4
7
,
7
8
0
5.
9
%
C/
D
0
.
2
3
0
.
2
9
A-
1
2
(
F
u
t
u
r
e
)
A
-
1
2
(
F
u
t
u
r
e
)
1.
1
5
5
0
,
0
2
0
-
4
4
,
9
0
0
-
-
5
,
1
2
0
90
.
0
%
C/
D
0
.
8
7
1
.
0
0
A-
1
3
A
-
1
3
0.
2
6
1
1
,
5
1
7
1
1
,
5
1
7
-
-
-
-
90
.
0
%
C/
D
0
.
9
5
1
.
0
0
A-
T
O
T
A
L
A
-
T
O
T
A
L
10
.
3
4
4
5
0
,
3
5
9
7
6
,
3
1
1
5
7
,
2
6
1
8
4
,
5
3
7
-
2
3
2
,
2
5
1
45
.
9
%
C
/
D
0
.
5
6
0
.
7
0
B-
1
B
-
1
0.
4
2
1
8
,
4
8
6
-
5
,
9
0
7
4
,
2
1
8
-
8
,
3
6
1
53
.
4
%
C/
D
0
.
6
1
0
.
7
6
B-
2
B
-
2
1.
4
5
6
2
,
9
9
5
-
2
3
,
6
4
0
3
,
2
7
7
-
3
6
,
0
7
8
43
.
4
%
C/
D
0
.
5
2
0
.
6
5
B-
T
O
T
A
L
B
-
T
O
T
A
L
1.
8
7
8
1
,
4
8
1
-
2
9
,
5
4
7
7
,
4
9
5
-
4
4
,
4
3
9
45
.
6
%
C
/
D
0
.
5
4
0
.
6
8
C-
1
C
-
1
1.
2
7
5
5
,
2
5
8
-
-
8
,
6
5
1
-
4
6
,
6
0
7
15
.
8
%
C/
D
0
.
3
2
0
.
4
0
C-
T
O
T
A
L
C
-
T
O
T
A
L
1.
2
7
5
5
,
2
5
8
-
-
8
,
6
5
1
-
4
6
,
6
0
7
15
.
8
%
C
/
D
0
.
3
2
0
.
4
0
OS
-
1
O
S
-
1
0.
6
8
2
9
,
5
3
3
2
9
,
5
3
3
2.
0
%
C/
D
0
.
2
0
0
.
2
5
OS
-
2
A
O
S
-
2
A
0.
2
1
8
,
9
4
0
8
,
9
4
0
2.
0
%
C/
D
0
.
2
0
0
.
2
5
OS
-
2
B
O
S
-
2
B
0.
9
3
4
0
,
3
1
0
2
6
,
5
6
8
6
,
2
2
8
7
,
5
1
4
80
.
2
%
C/
D
0
.
8
1
1
.
0
0
OS
-
3
O
S
-
3
0.
5
1
2
2
,
1
1
5
1
5
,
3
0
9
4
,
3
2
1
2
,
4
8
5
87
.
0
%
C/
D
0
.
8
7
1
.
0
0
OS
-
4
O
S
-
4
1.
2
6
5
4
,
6
9
7
3
2
,
2
7
2
5
,
6
6
4
1
6
,
7
6
1
68
.
9
%
C/
D
0
.
7
2
0
.
9
0
OS
-
5
O
S
-
5
0.
5
4
2
3
,
6
6
8
2
3
,
6
6
8
2.
0
%
C/
D
0
.
2
0
0
.
2
5
OS
-
T
O
T
A
L
O
S
-
T
O
T
A
L
4.
1
2
1
7
9
,
2
6
3
-
7
4
,
1
4
9
1
6
,
2
1
3
-
8
8
,
9
0
1
50
.
5
%
C
/
D
0
.
5
8
0
.
7
2
17
.
5
9
7
6
6
,
3
6
1
7
6
,
3
1
1
1
6
0
,
9
5
7
1
1
6
,
8
9
5
-
4
1
2
,
1
9
8
4
4
.
8
%
C
/
D
0
.
5
5
0
.
6
8
No
t
e
s
:
(1
)
R
e
c
o
m
m
e
n
d
e
d
R
u
n
o
f
f
C
o
e
f
f
i
c
i
e
n
t
V
a
l
u
e
s
f
r
o
m
F
C
S
C
M
T
a
b
l
e
R
O
-
1
1
.
(2
)
C
o
m
p
o
s
i
t
e
R
u
n
o
f
f
C
o
e
f
f
i
c
i
e
n
t
i
s
b
a
s
e
d
o
n
F
C
S
C
M
e
q
u
a
t
i
o
n
R
O
-
8
a
n
d
C
o
e
f
f
i
c
i
e
n
t
A
d
j
u
s
t
m
e
n
t
f
a
c
t
o
r
s
p
e
r
T
a
b
l
e
R
O
-
1
2
.
(3
)
B
a
s
i
n
A
-
1
i
n
c
l
u
d
e
s
a
p
p
r
o
x
i
m
a
t
e
l
y
8
,
5
0
0
s
f
o
f
f
u
t
u
r
e
b
u
i
l
d
i
n
g
.
B
a
s
i
n
B
-
2
i
n
c
l
u
d
e
s
a
p
p
r
o
x
i
m
a
t
e
l
y
1
0
,
0
0
0
s
f
o
f
f
u
t
u
r
e
p
a
r
k
i
n
g
a
r
e
a
.
(4
)
B
a
s
i
n
A
-
1
2
(
F
u
t
u
r
e
)
i
s
i
n
c
l
u
d
e
d
f
o
r
s
t
o
r
m
s
e
w
e
r
s
i
z
i
n
g
o
n
l
y
a
n
d
i
s
n
o
t
i
n
c
l
u
d
e
d
w
i
t
h
i
n
"
A
-
T
O
T
A
L
"
a
b
o
v
e
.
D
e
t
e
n
t
i
o
n
a
n
d
L
I
D
r
e
q
u
i
r
e
m
e
n
t
s
w
i
l
l
b
e
r
e
q
u
i
r
e
d
f
o
r
B
a
s
i
n
A
-
1
2
w
i
t
h
f
u
t
u
r
e
d
e
v
e
l
o
p
m
e
n
t
.
Pr
o
p
o
s
e
d
T
o
t
a
l
Pr
o
p
o
s
e
d
B
a
s
i
n
s
Ar
e
a
s
Co
m
p
o
s
i
t
e
R
u
n
o
f
f
C
o
e
f
f
i
c
i
e
n
t
s
(2
)
Da
t
e
:
4
/
9
/
2
0
1
8
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
u
s
\
R
e
p
o
r
t
s
\
D
r
a
i
n
a
g
e
\
C
a
l
c
u
l
a
t
i
o
n
s
\
U
1
6
0
1
4
-
D
r
a
i
n
C
a
l
c
s
.
x
l
s
m
2-
Y
e
a
r
T
i
m
e
o
f
C
o
n
c
e
n
t
r
a
t
i
o
n
Pl
a
t
t
e
R
i
v
e
r
P
o
w
e
r
A
u
t
h
o
r
i
t
y
C
a
m
p
u
s
,
F
o
r
t
C
o
l
l
i
n
s
,
C
O
Ba
s
i
n
D
e
s
i
g
n
P
t
.
A
r
e
a
C(1
)
Le
n
g
t
h
S
l
o
p
e
ti(2
)
Le
n
g
t
h
S
l
o
p
e
C
v
Ve
l
o
c
i
t
y
(3
)
tt(4
)
Ch
e
c
k
t
c?
To
t
a
l
L
e
n
g
t
h
tc(5
)
ac
r
e
s
f
t
%
m
i
n
f
t
%
f
p
s
m
i
n
m
i
n
U
r
b
a
n
?
f
t
m
i
n
m
i
n
EX
1
E
X
1
3
.
7
5
0.
5
7
35
3.
8
%
3.
8
39
0
2.
3
%
20
3.
0
2
.
1
5
.
9
Y
e
s
4
2
5
1
2
5.
9
EX
2
E
X
2
2
.
3
8
0
.
4
4
2
7
5
0
.
6
%
2
4
.
2
1
9
0
1
.
0
%
7
0.
7
4
.
5
2
8
.
7
Y
e
s
4
6
5
1
3
12
.
6
EX
3
E
X
3
2
.
1
9
0
.
8
2
2
0
1
.
2
%
2
.
2
4
1
5
1
.
0
%
2
0
2.
0
3
.
5
5
.
7
Y
e
s
4
3
5
1
2
5.
7
EX
4
E
X
4
2
.
3
3
0
.
3
4
5
0
1
.
0
%
1
0
.
1
2
0
5
1
.
1
%
7
0.
7
4
.
7
1
4
.
7
Y
e
s
2
5
5
1
1
11
.
4
EX
5
E
X
5
1
.
3
5
0
.
2
8
1
0
5
1
.
1
%
1
5
.
2
1
3
0
0
.
1
%
7
0.
2
9
.
3
2
4
.
5
Y
e
s
2
3
5
1
1
11
.
3
OS
-
1
O
S
-
1
0
.
3
1
0
.
3
5
7
0
4
.
4
%
7
.
2
2
0
4
.
6
%
2
0
4.
3
0
.
1
7
.
3
Y
e
s
9
0
1
1
7.
3
OS
-
2
A
O
S
-
2
A
0
.
3
3
0
.
3
9
3
0
5
.
9
%
4
.
0
6
0
1
.
2
%
2
0
2.
2
0
.
5
4
.
5
Y
e
s
9
0
1
1
5.
0
OS
-
2
B
O
S
-
2
B
0
.
9
3
0
.
8
1
5
0
2
.
0
%
3
.
0
4
9
0
0
.
7
%
2
0
1.
6
5
.
1
8
.
1
Y
e
s
5
4
0
1
3
8.
1
OS
-
3
O
S
-
3
2
.
2
2
0
.
3
4
3
0
1
0
.
0
%
3
.
6
6
1
0
0
.
4
%
7
0.
4
2
3
.
0
2
6
.
6
Y
e
s
6
4
0
1
4
13
.
6
OS
-
4
O
S
-
4
1
.
2
8
0
.
7
5
6
0
5
.
0
%
3
.
0
2
5
0
1
.
1
%
2
0
2.
1
2
.
0
5
.
0
Y
e
s
3
1
0
1
2
5.
0
OS
-
5
O
S
-
5
0
.
5
4
0
.
2
0
3
0
1
0
.
0
%
4
.
3
2
0
0
0
.
7
%
7
0.
6
5
.
7
1
0
.
0
Y
e
s
2
3
0
1
1
10
.
0
No
t
e
s
:
(1
)
C
=
C
x*C
f
(2
)
ti =
[
1
.
8
7
(
1
.
1
-
C
xCf)L
1/
2
]/
S
1/
3
,
S
=
s
l
o
p
e
i
n
%
,
L
=
l
e
n
g
t
h
o
f
o
v
e
r
l
a
n
d
f
l
o
w
(
4
0
0
'
m
a
x
)
(3
)
V=
C
vS0.
5
,
S
=
w
a
t
e
r
c
o
u
r
s
e
s
l
o
p
e
i
n
f
t
/
f
t
,
U
D
F
C
D
E
q
u
a
t
i
o
n
R
O
-
4
(4
)
tt=L
/
(
V
*
6
0
s
e
c
/
m
i
n
)
(5
)
tc c
h
e
c
k
(
f
o
r
u
r
b
a
n
o
r
d
e
v
e
l
o
p
e
d
a
r
e
a
s
o
n
l
y
)
=
t
o
t
a
l
l
e
n
g
t
h
/
1
8
0
+
1
0
(6
)
mi
n
t
c =
5
m
i
n
Ex
i
s
t
i
n
g
B
a
s
i
n
s
In
i
t
i
a
l
O
v
e
r
l
a
n
d
F
l
o
w
T
i
m
e
(
t
i)
Tr
a
v
e
l
/
C
h
a
n
n
e
l
i
z
e
d
T
i
m
e
o
f
F
l
o
w
(
t
t)
ti+t
t
tc
Ch
e
c
k
f
o
r
U
r
b
a
n
i
z
e
d
B
a
s
i
n
s
Fi
n
a
l
tc(6
)
Da
t
e
:
4
/
9
/
2
0
1
8
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
u
s
\
R
e
p
o
r
t
s
\
D
r
a
i
n
a
g
e
\
C
a
l
c
u
l
a
t
i
o
n
s
\
U
1
6
0
1
4
-
D
r
a
i
n
C
a
l
c
s
.
x
l
s
m
2-
Y
e
a
r
T
i
m
e
o
f
C
o
n
c
e
n
t
r
a
t
i
o
n
Pl
a
t
t
e
R
i
v
e
r
P
o
w
e
r
A
u
t
h
o
r
i
t
y
C
a
m
p
u
s
,
F
o
r
t
C
o
l
l
i
n
s
,
C
O
Ba
s
i
n
D
e
s
i
g
n
P
t
.
A
r
e
a
C(1
)
Le
n
g
t
h
S
l
o
p
e
ti(2
)
Le
n
g
t
h
S
l
o
p
e
C
v
Ve
l
o
c
i
t
y
(3
)
tt(4
)
Ch
e
c
k
t
c?
To
t
a
l
L
e
n
g
t
h
tc(5
)
ac
r
e
s
f
t
%
m
i
n
f
t
%
f
p
s
m
i
n
m
i
n
U
r
b
a
n
?
f
t
m
i
n
m
i
n
A-
1
A
-
1
3
.
3
4
0.
3
2
23
5
1.
5
%
19
.
7
46
5
0.
5
%
20
1.
4
5
.
5
2
5
.
2
Y
e
s
7
0
0
1
4
13
.
9
A-
2
A
-
2
0
.
9
1
0
.
8
3
1
0
2
.
0
%
1
.
2
8
3
0
5
0
.
5
%
2
0
1.
4
3
.
6
4
.
9
Y
e
s
3
1
5
1
2
5.
0
A-
3
A
-
3
0
.
3
7
0
.
9
5
5
0
1
2
.
5
%
0
.
8
6
1
5
3
0
.
0
%
2
0
11
.
0
0
.
0
0
.
9
Y
e
s
6
5
1
0
5.
0
A-
4
A
-
4
0
.
5
7
0
.
8
6
3
6
2
.
0
%
2
.
1
2
2
4
2
2
.
0
%
2
0
2.
8
1
.
4
3
.
5
Y
e
s
2
7
8
1
2
5.
0
A-
5
A
-
5
0
.
4
0
0
.
8
4
5
0
2
.
0
%
2
.
7
6
1
3
3
1
.
5
%
2
0
2.
4
0
.
9
3
.
7
Y
e
s
1
8
3
1
1
5.
0
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6
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-
6
0
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5
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0
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6
4
1
7
2
.
0
%
2
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8
5
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2
3
2
.
0
%
2
0
2.
8
0
.
7
3
.
6
Y
e
s
1
4
0
1
1
5.
0
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7
A
-
7
0
.
3
2
0
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6
3
6
4
1
.
5
%
6
.
1
2
2
1
0
1
.
0
%
1
5
1.
5
2
.
3
8
.
5
Y
e
s
2
7
4
1
2
8.
5
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8
A
-
8
0
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2
1
0
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7
4
1
5
2
.
0
%
2
.
0
8
5
0
2
.
0
%
2
0
2.
8
0
.
3
2
.
4
Y
e
s
6
5
1
0
5.
0
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9
A
-
9
0
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6
4
0
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9
5
2
5
1
2
.
5
%
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6
1
2
1
0
0
.
5
%
2
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4
2
.
5
3
.
1
Y
e
s
2
3
5
1
1
5.
0
A-
1
0
A
-
1
0
0
.
6
8
0
.
9
2
6
3
4
.
0
%
1
.
6
7
2
0
0
1
.
5
%
2
0
2.
4
1
.
4
3
.
0
Y
e
s
2
6
3
1
1
5.
0
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1
1
A
-
1
1
0
.
9
7
0
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4
1
2
0
7
.
0
%
3
.
0
3
1
9
0
0
.
5
%
1
5
1.
1
3
.
0
6
.
0
Y
e
s
2
1
0
1
1
6.
0
A-
1
2
A
-
1
2
1
.
1
5
0
.
2
3
2
0
7
.
0
%
3
.
8
1
2
0
5
0
.
5
%
1
5
1.
1
3
.
2
7
.
0
Y
e
s
2
2
5
1
1
7.
0
A-
1
2
(
F
u
t
u
r
e
)
A
-
1
2
(
F
u
t
u
r
e
)
1
.
1
5
0
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8
7
1
0
2
.
0
%
1
.
0
7
2
0
5
2
.
0
%
2
0
2.
8
1
.
2
2
.
3
Y
e
s
2
1
5
1
1
5.
0
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1
3
A
-
1
3
0
.
2
6
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9
5
7
2
1
2
.
5
%
1
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0
3
1
5
3
0
.
0
%
2
0
11
.
0
0
.
0
1
.
1
Y
e
s
8
7
1
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5.
0
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T
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T
A
L
A
-
T
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T
A
L
1
0
.
3
4
0
.
5
6
5
1
1
.
5
%
6
.
2
7
9
8
5
0
.
4
%
2
0
1.
3
1
3
.
0
1
9
.
2
Y
e
s
1
0
3
6
1
6
1
5
.
8
B-
1
B
-
1
0
.
4
2
0
.
6
1
7
0
2
.
0
%
6
.
0
9
4
0
2
.
0
%
2
0
2.
8
0
.
2
6
.
3
Y
e
s
1
1
0
1
1
6.
3
B-
2
B
-
2
1
.
4
5
0
.
5
2
5
0
2
5
.
0
%
2
.
6
5
2
9
0
0
.
5
%
1
5
1.
1
4
.
6
7
.
2
Y
e
s
3
4
0
1
2
7.
2
B-
T
O
T
A
L
B
-
T
O
T
A
L
1
.
8
7
0
.
5
4
5
0
2
5
.
0
%
2
.
5
6
2
9
0
0
.
5
%
1
5
1.
1
4
.
6
7
.
1
Y
e
s
3
4
0
1
2
7
.
1
C-
1
C
-
1
1
.
2
7
0
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3
2
1
6
2
.
0
%
4
.
6
6
7
5
1
0
.
0
%
1
5
4.
7
0
.
3
4
.
9
Y
e
s
9
1
1
1
5.
0
C-
T
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T
A
L
C
-
T
O
T
A
L
1
.
2
7
0
.
3
2
1
6
2
.
0
%
4
.
6
6
7
5
1
0
.
0
%
1
5
4.
7
0
.
3
4
.
9
Y
e
s
9
1
1
1
5
.
0
OS
-
1
O
S
-
1
0
.
6
8
0
.
2
0
7
0
4
.
4
%
8
.
6
4
2
0
4
.
6
%
2
0
4.
3
0
.
1
8
.
7
Y
e
s
9
0
1
1
8.
7
OS
-
2
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O
S
-
2
A
0
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2
1
0
.
2
0
3
0
5
.
9
%
5
.
1
3
6
0
1
.
2
%
2
0
2.
2
0
.
5
5
.
6
Y
e
s
9
0
1
1
5.
6
OS
-
2
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O
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-
2
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0
.
9
3
0
.
8
1
5
0
2
.
0
%
3
.
0
5
4
9
0
0
.
7
%
2
0
1.
6
5
.
1
8
.
1
Y
e
s
5
4
0
1
3
8.
1
OS
-
3
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S
-
3
0
.
5
1
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.
8
7
1
4
0
1
.
5
%
4
.
5
3
1
6
5
0
.
7
%
2
0
1.
7
1
.
6
6
.
2
Y
e
s
3
0
5
1
2
6.
2
OS
-
4
O
S
-
4
1
.
2
6
0
.
7
2
6
0
5
.
0
%
3
.
2
3
2
5
0
1
.
1
%
2
0
2.
1
2
.
0
5
.
2
Y
e
s
3
1
0
1
2
5.
2
OS
-
5
O
S
-
5
0
.
5
4
0
.
2
0
3
0
1
0
.
0
%
4
.
3
1
2
0
0
0
.
7
%
7
0.
6
5
.
7
1
0
.
0
Y
e
s
2
3
0
1
1
10
.
0
No
t
e
s
:
(1
)
C
=
C
x*C
f
(2
)
ti =
[
1
.
8
7
(
1
.
1
-
C
xCf)L
1/
2
]/
S
1/
3
,
S
=
s
l
o
p
e
i
n
%
,
L
=
l
e
n
g
t
h
o
f
o
v
e
r
l
a
n
d
f
l
o
w
(
4
0
0
'
m
a
x
)
(3
)
V=
C
vS0.
5
,
S
=
w
a
t
e
r
c
o
u
r
s
e
s
l
o
p
e
i
n
f
t
/
f
t
,
U
D
F
C
D
E
q
u
a
t
i
o
n
R
O
-
4
(4
)
tt=L
/
(
V
*
6
0
s
e
c
/
m
i
n
)
(5
)
tc c
h
e
c
k
(
f
o
r
u
r
b
a
n
o
r
d
e
v
e
l
o
p
e
d
a
r
e
a
s
o
n
l
y
)
=
t
o
t
a
l
l
e
n
g
t
h
/
1
8
0
+
1
0
(6
)
mi
n
t
c =
5
m
i
n
Pr
o
p
o
s
e
d
B
a
s
i
n
s
In
i
t
i
a
l
O
v
e
r
l
a
n
d
F
l
o
w
T
i
m
e
(
t
i)
Tr
a
v
e
l
/
C
h
a
n
n
e
l
i
z
e
d
T
i
m
e
o
f
F
l
o
w
(
t
t)
ti+t
t
tc
Ch
e
c
k
f
o
r
U
r
b
a
n
i
z
e
d
B
a
s
i
n
s
Fi
n
a
l
tc(6
)
Da
t
e
:
4
/
9
/
2
0
1
8
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
u
s
\
R
e
p
o
r
t
s
\
D
r
a
i
n
a
g
e
\
C
a
l
c
u
l
a
t
i
o
n
s
\
U
1
6
0
1
4
-
D
r
a
i
n
C
a
l
c
s
.
x
l
s
m
10
0
-
Y
e
a
r
T
i
m
e
o
f
C
o
n
c
e
n
t
r
a
t
i
o
n
Pl
a
t
t
e
R
i
v
e
r
P
o
w
e
r
A
u
t
h
o
r
i
t
y
C
a
m
p
u
s
,
F
o
r
t
C
o
l
l
i
n
s
,
C
O
Ba
s
i
n
D
e
s
i
g
n
P
t
.
A
r
e
a
C(1
)
Le
n
g
t
h
S
l
o
p
e
ti(2
)
Le
n
g
t
h
S
l
o
p
e
C
v
Ve
l
o
c
i
t
y
(3
)
tt(4
)
Ch
e
c
k
t
c?
To
t
a
l
L
e
n
g
t
h
tc(5
)
ac
r
e
s
f
t
%
m
i
n
f
t
%
f
p
s
m
i
n
m
i
n
U
r
b
a
n
?
f
t
m
i
n
m
i
n
EX
1
E
X
1
3
.
7
5
0.
7
1
35
3.
8
%
2.
8
39
0
2.
3
%
20
3.
0
2
.
1
4
.
9
Y
e
s
4
2
5
1
2
5.
0
EX
2
E
X
2
2
.
3
8
0
.
5
5
2
7
5
0
.
6
%
2
0
.
2
1
9
0
1
.
0
%
7
0.
7
4
.
5
2
4
.
7
Y
e
s
4
6
5
1
3
12
.
6
EX
3
E
X
3
2
.
1
9
1.
0
0
20
1.
2
%
0.
8
41
5
1.
0
%
20
2.
0
3
.
5
4
.
2
Y
e
s
4
3
5
1
2
5.
0
EX
4
E
X
4
2
.
3
3
0
.
4
2
5
0
1
.
0
%
8
.
9
2
0
5
1
.
1
%
7
0.
7
4
.
7
1
3
.
6
Y
e
s
2
5
5
1
1
11
.
4
EX
5
E
X
5
1
.
3
5
0.
3
5
10
5
1.
1
%
13
.
9
13
0
0.
1
%
7
0.
2
9
.
3
2
3
.
2
Y
e
s
2
3
5
1
1
11
.
3
OS
-
1
O
S
-
1
0
.
3
1
0.
4
3
70
4.
4
%
6.
4
20
4.
6
%
20
4.
3
0
.
1
6
.
5
Y
e
s
9
0
1
1
6.
5
OS
-
2
A
O
S
-
2
A
0
.
3
3
0
.
4
9
3
0
5
.
9
%
3
.
5
6
0
1
.
2
%
2
0
2.
2
0
.
5
3
.
9
Y
e
s
9
0
1
1
5.
0
OS
-
2
B
O
S
-
2
B
0
.
9
3
1.
0
0
50
2.
0
%
1.
1
49
0
0.
7
%
20
1.
6
5
.
1
6
.
1
Y
e
s
5
4
0
1
3
6.
1
OS
-
3
O
S
-
3
2
.
2
2
0
.
4
3
3
0
1
0
.
0
%
3
.
2
6
1
0
0
.
4
%
7
0.
4
2
3
.
0
2
6
.
2
Y
e
s
6
4
0
1
4
13
.
6
OS
-
4
O
S
-
4
1
.
2
8
0.
9
3
60
5.
0
%
1.
4
25
0
1.
1
%
20
2.
1
2
.
0
3
.
4
Y
e
s
3
1
0
1
2
5.
0
OS
-
5
O
S
-
5
0
.
5
4
0
.
2
5
3
0
1
0
.
0
%
4
.
1
2
0
0
0
.
7
%
7
0.
6
5
.
7
9
.
8
Y
e
s
2
3
0
1
1
9.
8
No
t
e
s
:
(1
)
C
=
C
x*C
f
(2
)
ti =
[
1
.
8
7
(
1
.
1
-
C
xCf)L
1/
2
]/
S
1/
3
,
S
=
s
l
o
p
e
i
n
%
,
L
=
l
e
n
g
t
h
o
f
o
v
e
r
l
a
n
d
f
l
o
w
(
4
0
0
'
m
a
x
)
(3
)
V=
C
vS0.
5
,
S
=
w
a
t
e
r
c
o
u
r
s
e
s
l
o
p
e
i
n
f
t
/
f
t
,
U
D
F
C
D
E
q
u
a
t
i
o
n
R
O
-
4
(4
)
tt=L
/
(
V
*
6
0
s
e
c
/
m
i
n
)
(5
)
tc c
h
e
c
k
(
f
o
r
u
r
b
a
n
o
r
d
e
v
e
l
o
p
e
d
a
r
e
a
s
o
n
l
y
)
=
t
o
t
a
l
l
e
n
g
t
h
/
1
8
0
+
1
0
(6
)
mi
n
t
c =
5
m
i
n
Ex
i
s
t
i
n
g
B
a
s
i
n
s
ti+t
t
Fi
n
a
l
tc(6
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tc
Ch
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c
k
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r
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d
B
a
s
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n
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In
i
t
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a
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r
l
a
n
d
F
l
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w
T
i
m
e
(
t
i)
Tr
a
v
e
l
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C
h
a
n
n
e
l
i
z
e
d
T
i
m
e
o
f
F
l
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w
(
t
t)
Da
t
e
:
4
/
9
/
2
0
1
8
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
u
s
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R
e
p
o
r
t
s
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D
r
a
i
n
a
g
e
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C
a
l
c
u
l
a
t
i
o
n
s
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U
1
6
0
1
4
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D
r
a
i
n
C
a
l
c
s
.
x
l
s
m
10
0
-
Y
e
a
r
T
i
m
e
o
f
C
o
n
c
e
n
t
r
a
t
i
o
n
Pl
a
t
t
e
R
i
v
e
r
P
o
w
e
r
A
u
t
h
o
r
i
t
y
C
a
m
p
u
s
,
F
o
r
t
C
o
l
l
i
n
s
,
C
O
Ba
s
i
n
D
e
s
i
g
n
P
t
.
A
r
e
a
C(1
)
Le
n
g
t
h
S
l
o
p
e
ti(2
)
Le
n
g
t
h
S
l
o
p
e
C
v
Ve
l
o
c
i
t
y
(3
)
tt(4
)
Ch
e
c
k
t
c?
To
t
a
l
L
e
n
g
t
h
tc(5
)
ac
r
e
s
f
t
%
m
i
n
f
t
%
f
p
s
m
i
n
m
i
n
U
r
b
a
n
?
f
t
m
i
n
m
i
n
A-
1
A
-
1
3
.
3
4
0.
3
9
23
5
1.
5
%
17
.
7
46
5
0.
5
%
20
1.
4
5
.
5
2
3
.
2
Y
e
s
7
0
0
1
4
13
.
9
A-
2
A
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2
0
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9
1
1
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0
0
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0
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0
%
0
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4
7
3
0
5
0
.
5
%
2
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4
3
.
6
4
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1
Y
e
s
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1
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2
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0
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3
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3
0
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3
7
1.
0
0
50
12
.
5
%
0.
5
7
15
30
.
0
%
20
11
.
0
0
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0
0
.
6
Y
e
s
6
5
1
0
5.
0
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4
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4
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0
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0
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8
9
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4
2
2
.
0
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0
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8
1
.
4
2
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3
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e
s
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8
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2
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0
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5
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5
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4
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0
0
50
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0
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0
5
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3
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5
%
20
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4
0
.
9
2
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0
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e
s
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3
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1
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0
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6
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6
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5
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0
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8
7
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2
3
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.
0
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0
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8
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7
2
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6
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e
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4
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0
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7
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3
2
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7
9
64
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5
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4.
0
6
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0
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15
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5
2
.
3
6
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4
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e
s
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7
4
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2
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4
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8
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-
8
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1
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9
2
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0
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0
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0
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2
0
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8
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3
1
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3
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e
s
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5
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0
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0
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9
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9
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12
.
5
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4
1
21
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5
%
20
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4
2
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5
2
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9
Y
e
s
2
3
5
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1
5.
0
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1
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1
0
0
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6
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1
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0
0
6
3
4
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0
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0
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9
4
2
0
0
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.
5
%
2
0
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4
1
.
4
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3
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e
s
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6
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5.
0
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1
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9
7
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5
1
20
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0
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2.
5
8
19
0
0.
5
%
15
1.
1
3
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0
5
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6
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e
s
2
1
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1
5.
6
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1
2
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-
1
2
1
.
1
5
0
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2
9
2
0
7
.
0
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3
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5
6
2
0
5
0
.
5
%
1
5
1.
1
3
.
2
6
.
8
Y
e
s
2
2
5
1
1
6.
8
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1
2
(
F
u
t
u
r
e
)
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1
2
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F
u
t
u
r
e
)
1
.
1
5
1.
0
0
10
2.
0
%
0.
4
7
20
5
2.
0
%
20
2.
8
1
.
2
1
.
7
Y
e
s
2
1
5
1
1
5.
0
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1
3
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-
1
3
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2
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.
0
0
7
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1
2
.
5
%
0
.
6
9
1
5
3
0
.
0
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2
0
11
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0
0
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0
0
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7
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e
s
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7
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0
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0
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1
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4
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7
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51
1.
5
%
4.
6
3
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5
0.
4
%
20
1.
3
1
3
.
0
1
7
.
6
Y
e
s
1
0
3
6
1
6
1
5
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8
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1
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1
0
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4
2
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7
6
70
2.
0
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4.
1
9
40
2.
0
%
20
2.
8
0
.
2
4
.
4
Y
e
s
1
1
0
1
1
5.
0
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2
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2
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.
4
5
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6
5
5
0
2
5
.
0
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2
.
0
5
2
9
0
0
.
5
%
1
5
1.
1
4
.
6
6
.
6
Y
e
s
3
4
0
1
2
6.
6
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T
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T
A
L
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T
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T
A
L
1
.
8
7
0.
6
8
50
25
.
0
%
1.
9
4
29
0
0.
5
%
20
1.
4
3
.
4
5
.
4
Y
e
s
3
4
0
1
2
5
.
4
C-
1
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1
1
.
2
7
0.
4
0
16
2.
0
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4.
1
8
75
10
.
0
%
15
4.
7
0
.
3
4
.
4
Y
e
s
9
1
1
1
5.
0
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T
O
T
A
L
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-
T
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T
A
L
1
.
2
7
0
.
4
0
1
6
2
.
0
%
4
.
1
8
7
5
1
0
.
0
%
1
5
4.
7
0
.
3
4
.
4
Y
e
s
9
1
1
1
5
.
0
OS
-
1
O
S
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1
0
.
6
8
0
.
2
5
7
0
4
.
4
%
8
.
1
6
2
0
4
.
6
%
2
0
4.
3
0
.
1
8
.
2
Y
e
s
9
0
1
1
8.
2
OS
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2
A
O
S
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2
A
0
.
2
1
0.
2
5
30
5.
9
%
4.
8
5
60
1.
2
%
20
2.
2
0
.
5
5
.
3
Y
e
s
9
0
1
1
5.
3
OS
-
2
B
O
S
-
2
B
0
.
9
3
1
.
0
0
5
0
2
.
0
%
1
.
0
5
4
9
0
0
.
7
%
2
0
1.
6
5
.
1
6
.
1
Y
e
s
5
4
0
1
3
6.
1
OS
-
3
O
S
-
3
0
.
5
1
1.
0
0
14
0
1.
5
%
1.
9
4
16
5
0.
7
%
20
1.
7
1
.
6
3
.
6
Y
e
s
3
0
5
1
2
5.
0
OS
-
4
O
S
-
4
1
.
2
6
0
.
9
0
6
0
5
.
0
%
1
.
7
0
2
5
0
1
.
1
%
2
0
2.
1
2
.
0
3
.
7
Y
e
s
3
1
0
1
2
5.
0
OS
-
5
O
S
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5
0
.
5
4
0.
2
5
30
10
.
0
%
4.
0
7
20
0
0.
7
%
7
0.
6
5
.
7
9
.
8
Y
e
s
2
3
0
1
1
9.
8
No
t
e
s
:
(1
)
C
=
C
x*C
f
(2
)
ti =
[
1
.
8
7
(
1
.
1
-
C
xCf)L
1/
2
]/
S
1/
3
,
S
=
s
l
o
p
e
i
n
%
,
L
=
l
e
n
g
t
h
o
f
o
v
e
r
l
a
n
d
f
l
o
w
(
4
0
0
'
m
a
x
)
(3
)
V=
C
vS0.
5
,
S
=
w
a
t
e
r
c
o
u
r
s
e
s
l
o
p
e
i
n
f
t
/
f
t
,
U
D
F
C
D
E
q
u
a
t
i
o
n
R
O
-
4
(4
)
tt=L
/
(
V
*
6
0
s
e
c
/
m
i
n
)
(5
)
tc c
h
e
c
k
(
f
o
r
u
r
b
a
n
o
r
d
e
v
e
l
o
p
e
d
a
r
e
a
s
o
n
l
y
)
=
t
o
t
a
l
l
e
n
g
t
h
/
1
8
0
+
1
0
(6
)
mi
n
t
c =
5
m
i
n
Pr
o
p
o
s
e
d
B
a
s
i
n
s
In
i
t
i
a
l
O
v
e
r
l
a
n
d
F
l
o
w
T
i
m
e
(
t
i)
Tr
a
v
e
l
/
C
h
a
n
n
e
l
i
z
e
d
T
i
m
e
o
f
F
l
o
w
(
t
t)
ti+t
t
tc
Ch
e
c
k
f
o
r
U
r
b
a
n
i
z
e
d
B
a
s
i
n
s
Fi
n
a
l
tc(6
)
Da
t
e
:
4
/
9
/
2
0
1
8
P:
\
U
1
6
0
1
4
-
P
R
P
A
C
a
m
p
u
s
\
R
e
p
o
r
t
s
\
D
r
a
i
n
a
g
e
\
C
a
l
c
u
l
a
t
i
o
n
s
\
U
1
6
0
1
4
-
D
r
a
i
n
C
a
l
c
s
.
x
l
s
m
Ra
t
i
o
n
a
l
M
e
t
h
o
d
P
e
a
k
R
u
n
o
f
f
Pl
a
t
t
e
R
i
v
e
r
P
o
w
e
r
A
u
t
h
o
r
i
t
y
C
a
m
p
u
s
,
F
o
r
t
C
o
l
l
i
n
s
,
C
O
Ba
s
i
n
D
e
s
i
g
n
P
t
.
A
r
e
a
2
-
y
e
a
r
1
0
0
-
y
e
a
r
ac
r
e
tc
tc
C2
C10
0
I2
I10
0
Q2
Q10
0
mi
n
m
i
n
i
n
/
h
r
i
n
/
h
r
c
f
s
c
f
s
EX
1
E
X
1
3
.
7
5
6
5
0
.
5
7
0
.
7
1
2
.
6
7
9
.
9
5
5
.
7
1
2
6
.
6
2
EX
2
E
X
2
2
.
3
8
1
3
1
3
0
.
4
4
0
.
5
5
1
.
9
8
6
.
9
2
2
.
0
7
9
.
0
4
EX
3
E
X
3
2
.
1
9
6
5
0
.
8
2
1
.
0
0
2
.
6
7
9
.
9
5
4
.
7
8
2
1
.
7
5
EX
4
E
X
4
2
.
3
3
1
1
1
1
0
.
3
4
0
.
4
2
2
.
1
3
7
.
4
2
1
.
6
8
7
.
3
3
EX
5
E
X
5
1
.
3
5
1
1
1
1
0
.
2
8
0
.
3
5
2
.
1
3
7
.
4
2
0
.
8
1
3
.
5
3
OS
-
1
O
S
-
1
0
.
3
1
7
6
0
.
3
5
0
.
4
3
2
.
5
2
9
.
9
5
0
.
2
7
1
.
3
2
OS
-
2
A
O
S
-
2
A
0
.
3
3
5
5
0
.
3
9
0
.
4
9
2
.
8
5
9
.
9
5
0
.
3
7
1
.
6
1
OS
-
2
B
O
S
-
2
B
0
.
9
3
8
6
0
.
8
1
1
.
0
0
2
.
4
0
9
.
3
1
1
.
8
0
8
.
6
2
OS
-
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APPENDIX B
Detention and Water Quality Calculations
Dention Pond Volume (FAA Method)
Platte River Power Authority Campus, Fort Collins, CO
POND ID:POND A1
100 Year Storm Into Detention Facility
Area =581,090 square feet
Area =13.34 acres
C 100 = 0.71
Q 100 = 58.44 cfs (Total flows from Basins A and B)
Release Rate Out of Pond
Q OUT = 3.15 cfs
Unit Flow =0.24 cfs/acre
T C =15.8 minutes
Notes:
1. Release Rate limited by the existing 12" outfall capacity in Timberline Road.
2. Pond area includes all of Basins A, B and OS-2 but excludes "Basin A-12 (Future)".
Detention Volume Calculations
Rainfall Rainfall Inflow Rate Inflow Volume Adjustment Average Outflow Volume Required
Duration (T) Intensity (I) Qin 100*Area*I Vi=(Qin*T*60) Factor Outflow Rate Vo=Qav*T *60 Storage Volume
m= 0.5(1 + Tc/T) Qav = m*Qout Vs=Vi-Vo
min in/hr cfs ft 3 cfs ft 3 ft 3
5 9.95 94.7 28,418 1.00 3.15 945 27,473
10 7.72 73.5 44,098 1.00 3.15 1,890 42,208
15 6.52 62.1 55,866 1.00 3.15 2,835 53,031
20 5.60 53.3 63,977 1.00 3.15 3,780 60,197
25 4.98 47.4 71,117 1.00 3.15 4,725 66,392
30 4.52 43.0 77,458 1.00 3.15 5,670 71,788
35 4.08 38.8 81,571 1.00 3.15 6,615 74,956
40 3.74 35.6 85,455 1.00 3.15 7,560 77,895
45 3.46 32.9 88,939 1.00 3.15 8,505 80,434
50 3.23 30.8 92,253 1.00 3.15 9,450 82,803
55 3.03 28.8 95,194 1.00 3.15 10,395 84,799
60 2.86 27.2 98,022 1.00 3.15 11,340 86,682
70 2.59 24.7 103,563 1.00 3.15 13,230 90,333
80 2.38 22.7 108,761 1.00 3.15 15,120 93,641
90 2.21 21.0 113,616 1.00 3.15 17,010 96,606
100 2.06 19.6 117,672 1.00 3.15 18,900 98,772
110 1.94 18.5 121,899 1.00 3.15 20,790 101,109
120 1.84 17.5 126,126 1.00 3.15 22,680 103,446
Required Detention Volume
V 100 = 103,446 cubic feet
V 100 = 2.37 acre-ft
Date: 4/9/2018 P:\U16014 - PRPA Campus\Reports\Drainage\Calculations\U16014-Drain Calcs.xlsm
STAGE STORAGE TABLE - POND A1 NORTH
ELEV
AREA
(sq. ft.)
DEPTH
(ft)
AVG END
INC. VOL.
(cu. ft.)
AVG END
TOTAL VOL.
(cu. ft.)
CONIC
INC. VOL.
(cu. ft.)
CONIC
TOTAL VOL.
(cu. ft.)
4,948.200 137.56 N/A N/A 0.00 N/A 0.00
4,948.400 1,094.72 0.200 123.23 123.23 108.02 108.02
4,948.600 3,133.91 0.200 422.86 546.09 405.39 513.41
4,948.800 6,000.79 0.200 913.47 1459.56 898.09 1411.50
4,949.000 9,570.39 0.200 1557.12 3016.68 1543.30 2954.79
4,949.200 13,193.81 0.200 2276.42 5293.10 2266.75 5221.54
4,949.400 16,829.99 0.200 3002.38 8295.48 2995.01 8216.55
4,949.600 20,811.40 0.200 3764.14 12059.62 3757.10 11973.65
4,949.800 24,256.08 0.200 4506.75 16566.36 4502.35 16476.00
4,950.000 27,457.60 0.200 5171.37 21737.73 5168.06 21644.07
4,950.200 30,539.89 0.200 5799.75 27537.48 5797.02 27441.08
4,950.400 33,087.44 0.200 6362.73 33900.21 6361.03 33802.12
4,950.600 34,901.34 0.200 6798.88 40699.09 6798.07 40600.19
4,950.800 36,320.29 0.200 7122.16 47821.26 7121.69 47721.88
4,951.000 37,391.61 0.200 7371.19 55192.45 7370.93 55092.81
4,951.200 38,356.39 0.200 7574.80 62767.25 7574.59 62667.41
4,951.400 39,341.32 0.200 7769.77 70537.02 7769.56 70436.97
4,951.600 40,353.45 0.200 7969.48 78506.49 7969.26 78406.23
4,951.800 41,397.19 0.200 8175.06 86681.56 8174.84 86581.07
4,952.000 42,572.75 0.200 8396.99 95078.55 8396.72 94977.79
4,952.200 43,891.77 0.200 8646.45 103725.00 8646.12 103623.91
4,952.400 45,220.87 0.200 8911.26 112636.27 8910.93 112534.84
STAGE STORAGE TABLE - POND A1 SOUTH
ELEV
AREA
(sq. ft.)
DEPTH
(ft)
AVG END
INC. VOL.
(cu. ft.)
AVG END
TOTAL VOL.
(cu. ft.)
CONIC
INC. VOL.
(cu. ft.)
CONIC
TOTAL VOL.
(cu. ft.)
4,949.000 1.34 N/A N/A 0.00 N/A 0.00
4,949.200 237.76 0.200 23.91 23.91 17.13 17.13
4,949.400 1,075.80 0.200 131.36 155.27 121.29 138.41
4,949.600 2,508.89 0.200 358.47 513.74 348.51 486.92
4,949.800 4,404.37 0.200 691.33 1205.06 682.50 1169.42
4,950.000 6,253.35 0.200 1065.77 2270.83 1060.38 2229.80
4,950.200 7,637.64 0.200 1389.10 3659.93 1386.79 3616.59
4,950.400 8,940.94 0.200 1657.86 5317.79 1656.15 5272.74
4,950.600 10,218.98 0.200 1915.99 7233.78 1914.57 7187.31
4,950.800 11,462.58 0.200 2168.16 9401.94 2166.97 9354.28
4,951.000 12,663.01 0.200 2412.56 11814.50 2411.56 11765.84
4,951.200 13,750.96 0.200 2641.40 14455.89 2640.65 14406.49
4,951.400 14,634.78 0.200 2838.57 17294.47 2838.12 17244.60
4,951.600 15,276.37 0.200 2991.12 20285.58 2990.89 20235.49
4,951.800 15,698.81 0.200 3097.52 23383.10 3097.42 23332.91
4,952.000 16,080.80 0.200 3177.96 26561.06 3177.89 26510.80
4,952.200 16,467.22 0.200 3254.80 29815.86 3254.73 29765.52
4,952.400 16,858.99 0.200 3332.62 33148.49 3332.54 33098.07
4,952.600 17,256.19 0.200 3411.52 36560.00 3411.44 36509.51
4,952.800 17,658.48 0.200 3491.47 40051.47 3491.39 40000.90
105,852 cf @ 4952.25
30,599 cf @ 4952.25
136,451 cf total volume (3.13 ac-ft)
2.37 ac-ft required for detention
(2.89 ac-ft provided)
0.18 ac-ft required for water quality
(0.24 ac-ft provided)
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a
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C
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.
x
l
s
m
A PPENDIX D
D RAINAGE E XHIBIT
SOUTH TIMBERLINE ROAD
UNION PACIFIC RAILROAD
MAINTENANCE SHOP
/ TRUCK WASH
SUBSTATION GARAGE
FLEET PARKING GARAGE A
FLEET PARKING
GARAGE B
PLATTE RIVER POWER AUTHORITY05/23/18
PLATTE RIVER POWER AUTHORITY HQ
DRAINAGE PLAN
PREPARED FOR:DATE SUBMITTED:
The engineer preparing these plans will not be responsible
for, or liable for, unauthorized changes to or uses of these
plans. All changes to the plans must be in writing and
must be approved by the preparer of these plans.