HomeMy WebLinkAboutDrainage Reports - 02/15/2008City n' Ft Collins A ovP l lans
Approved By
Date a-1 `u -D
FINAL DRAINAGE STUDY
FOR
VERN'S CUSTOM COUNTERTOPS
PREPARED FOR: ,
FREEMAN ARCHITECTS
2026 BLUE MESA COURT
LOVELAND, CO 80538
REVISED: SEPTEMBER 2007
DATE: MAY 2007
PROJECT NO. 213
CONSULTING ENGINEER:
LOONAN AND ASSOCIATES, INC.
1435 N. CLEVELAND AVE.
LOVELAND, CO 80538
I
1
' ,Ljoo�raot � �oQoc, %u,
1435?Z. elwdaadflve.
Z&Idaad, M 9'0539
(970) 461-0550
' 5;W (9701461-0551
September 7, 2007
'
Mr. Matt Johnson
Larimer County Engineering Department
'
200 West Oak Street, Suite 3000
PO Box 1190
Fort Collins, CO 80522-1190
'
'
RE: Vern's Custom Countertop
Dear Matt:
'
Loonan and Associates, Inc. is pleased to submit this Final Drainage Report and Plan for
the proposed Vern's Custom Countertop located on Cairnes Drive and Countryside
'
Drive. This information is provided in conjunction with the site plan for this project.
Please review this Final Drainage Report and Plan at your earliest convenience. We look
forward to your comments and ultimate approval of the Final Drainage Report.
'
Please feel free to contact me at (970) 461-0550, if you have additional questions.
'
Sincerely,
'
.Croon" 44d v% eoetatea,
' James R. Loonan
1
' PROFESSIONAL ENGINEER'S
CERTIFICATION
' I hereby certify that this Final Drainage Plan and Report for Vern's Custom
' Countertops was prepared by me or under my direct supervision in accordance with the
provisions of the Larimer County Storm Drainage Criteria Manual for the owners thereof.
1 Loonan and Associates, Inc.
1
James R. Loonan
Registered Professional Engineer
State of Colorado No. 19195
1
1
1
1
1
1
1
o
\14)
Ld
co
FE.
MULBERRY ST.
(�
FRONTAGE
RD.
FRONTAGE RD.
COUNTRYSIDE
DR.
U
N
N
z
a
v
E
ui
Z
o
BOG
Z� ALgH ST.
U
o
N R
DARREN ST.
OF
TMe�Rv
s• SITE
O
�9
A�
RIVERBEND PONDS
Y
NATURAL AREA
ST.
N
1
1
1
1
1
TABLE OF CONTENTS
SECTION I - GENERAL PROJECT LOCATION AND DESCRIPTION Page No.
Location
I
Description of Property
1
SECTION II - DRAINAGE BASINS & SUB -BASINS
Major Basin Description
1
Sub -Basin Description
1
SECTION III - DRAINAGE DESIGN CRITERIA
Regulations
1
Development Criteria Reference and Constraints
2
Hydrological Criteria
2
Hydraulic Criteria
2
SECTION IV - DRAINAGE FACILITY DESIGN
General Concept
2
Specific Details
2
SECTION V — CONCLUSIONS
Compliance with Standards
3
Drainage Concept
3
SECTION VI — REQUEST FOR VARIANCE
3
SECTION VII — STORMWATER QUALITY TREATMENT
3
SECTION VIII — EROSION AND SEDIMENT CONTROL
Discussion
4
General Erosion and Sediment Control Measures
4
Erosion and Sediment Control Plan
4
APPENDIX
EXHIBIT A - Grading and Drainage Plan
I
11
1
I
C
L
H.
1110
General Location and Description
A. Location
The Vern's Custom Countertops is located at 690 Cairns Drive which is at
the intersection of Caimes Drive and Countryside Drive, in a portion of the
northwest 1/4 of Section 17, Township 7 North, Range 68 West of the 6th
Principal Meridian, County of Larimer, State of Colorado. The site is located
east of Timberline Avenue and south of Highway 14.
B. Description of Property
The site consists of approximately 1.7 acres. The site is currently being used
as a landscape nursery. Most of the site is covered with either gravel or
buildings. Please refer to the photos located at the end of this study. In
general, the site slopes southerly at less than 1 percent. The proposed site
consists of 1 commercial site and 2 residential lots (one existing residence and
1 proposed residence). There is approximately 0.42 acres of offsite area that
is tributary to this development. The offsite runoff enters the eastern
boundary of the site.
Drainaee Basins and Sub -Basins
A. Major Basins Description
The site is located in the Cache La Poudre River drainage basin. Between this
site and Cache La Poudre River lies an existing multifamily project and what
appears to be an old gravel pit. The runoff from this site eventually drains
into the storm system, that was install with the construction of the multifamily
development, and into the river.
B. Sub -Basin Description
In the developed condition, there will be eight onsite subbasins considered.
The onsite subbasins consist of the proposed parking lot, existing and
proposed structures, and landscape areas. Runoff from the proposed
development will be directed to the east side of Caimes Drive or southerly to
the existing inlet located within the development to the south. The offsite
tributary basin consists of the back yards and roof tops from the houses
located east of this site.
Drainaee Design Criteria
A. Regulations
The design criteria for this study are directly from the Larimer County
Stormwater Design Standards (LCSDS) which is an addendum to the Urban
Storm Drainage Criteria Manuals Volumes 1, 2 and 3. No deviations were
made for this study.
B. Development Criteria Reference and Constraints
The developed site will convey runoff to the existing discharge points in a
safe and effective manner. The amount of impervious area being removed is
greater than the amount that will be constructed. There will not be an increase
in runoff due to the proposed development of this site.
C. Hydrological Criteria
This development is located within Hydrologic Area I, as identified in the
Latimer County Stormwater Design Standards. In accordance with the
Larimer County Stormwater Design Standards, a minor storm for the Fort
Collins area is identified as a 2-hour design storm with a recurrence interval of
10 years and a total rainfall depth of 1.75 inches. A major storm for the Fort
Collins area has a recurrence interval of 100 years and a total rainfall depth of
3.80 inches for a 2-hour design storm.
These storms have been used as a basis for planning and system design. The
peak flow rates for design points have been calculated based on the Rational
Method as described in the LCSDS with storm duration set equal to the time
of concentration for each subbasin.
D. Hydraulic Criteria
The runoff produced by the site will be conveyed to the existing drainage
discharge points for this site. The amount of impervious area being removed
is greater than the amount that will be constructed. There will not be an
increase in runoff due to the proposed development of this site.
IV. Drainage Facility Design
A. General Concept
Currently, the site drains more or less as sheet flow toward Caimes Drive or
southerly toward the development on the south. The development of this site
will try to maintain the historic flow pattern while decreasing the peak runoff
for the entire site.
B. Specific Details
Drainage from the parking lot will sheet flow toward the south or west and
onto landscape areas. These landscape areas will act as a water quality
features to remove sediment and other pollution. The roof will drain toward
the south and into a proposed grass swale. This landscaping and grass swale
will provide water quality treatment prior to leaving this development.
V. Conclusion
A. Compliance with Standards
All storm drainage calculations followed the guidelines provided by the
Latimer County Stormwater Design Standards, which as described above, is
an Addendum to the Urban Storm Drainage Criteria Manuals. Because the
runoff "c" values are lower for the proposed conditions than the current
conditions, we are requesting that detention ponding requirements be waived.
B. Drainage Concept
The drainage system has been designed to convey the runoff to the designated
design points in a safe manner. The amount of runoff to Design Point 10 (the
existing curb out located in Cairnes Drive) will decrease for all storm events.
The existing 2, 10 and 100 year runoff to Design Point 10 is 1.30, 3.30 and
9.37 cfs, respectfully. The corresponding developed runoff to Design Point 1
is 1.06, 3.03 and 9.23 cfs.
The total existing 100 year runoff for this site is 9.37 cfs and the total 100 year
developed runoff is 9.05 cfs.
VI. Request for Variance
Because the runoff "c" values are lower for the proposed conditions than the
current conditions, we are requesting that detention ponding requirements be
waived.
VII. Stormwater Ouality Treatment
After the completion of the removal of the existing buildings and gravel areas,
which is nearly complete, the amount of area that will be disturb with the
construction of the proposed building and parking lot is approximately 0.6
acres. All runoff from the building and parking lot will drain across landscape
areas prior to leaving the site. The landscape area will slow down the runoff
and allow sediment and other pollution to fall out.
VHL Erosion and Sediment Control
This section describes methods recommended to control wind erosion, soil
erosion and sediment from storm runoff during and after the construction of
drainage structures, and site grading. This development of erosion control
criteria establishes the methods and guidelines used to perform the erosion
analysis and develop the erosion control plan.
' A. Discussion
'
The clearing and stripping of land for site grading, overlot grading, or for the
construction of drainage structures, and swales, may cause high -localized
erosion rates with subsequent deposition and damage to offsite properties.
Uncontrolled, such erosion could destroy the aesthetic and practical values of
individual sites, and cause damage to downstream property.
'
In general, erosion and sediment control measures may consist of minimizing
soil exposure, controlled runoff across exposed areas, and sediment control at
drainage structures. Each of these measures is described below and shall be
'
utilized by the developer and/or the contractor during any construction activity
occurring at this site.
'
B. General Erosion and Sediment Control Measures
Minimizing Soil Exposure: Where practical, the construction area and
t
duration of soil exposure should be kept to a minimum. All other areas should
have a good cover of vegetation or mulch. Grading should be completed as
soon as possible after it is begun. A temporary cover crop, a permanent
'
vegetative cover crop, or other landscaping should be established in disturbed
areas. Re -vegetation may consist of native grasses, lawn grasses, or various
winter wheat. Decorative rock, flower gardens, or shrubs may also be utilized
'
in the final landscaping to cover the soil. Re -seeded areas should be mulched
with straw or hay to protect exposed soil until vegetation is established.
'
Controlled Runoff Across Exposed Areas: Where practical, construction may
include constructing temporary swales to intercept and direct storm water
around exposed areas. Swales can be constructed to control surface water,
'
which collects on exposed areas and prevent gross erosion in the form of
gullies. Riprap, straw bale dikes, or other temporary erosion control devices
may be installed to control storm water velocities across exposed areas.
'
Sediment Control: Temporary and/or permanent sediment control devices
may be installed at the major drainage structures and flow concentration
points shown on the Drainage Exhibit. Such structures shall be used to
intercept and trap sediment once it is produced and prevent it from being
conveyed offsite onto downstream property.
C. Erosion and Sediment Control Plan
' The following summarizes the overall erosion control plan for this project.
The details will be shown on the construction drawings.
' 1. Inlet protection will be used on all existing and proposed storm
culverts to help prevent debris from entering the storm system.
1 4
' 2. Other erosion control measures will be used as necessary to help
' minimize erosion for this project such as straw bales in the swales and
vehicle tracking control at the site exit.
3. Permanent seeding will be placed in all swales and other areas as
needed.
4. Silt fence will be placed on the eastern property boundary.
' 5. Vehicle tracking control will be placed at the site exit.
' 6. Other erosion control measures will be used as necessary to help
minimize erosion for this project.
5
I
APPENDIX
I
I
I
H
I
u
I
§:4
§
90M[-
§§
§
§
;lRRgg
!
a
■■r!;!!r
,
j
j\\\\�\aP
Po
|\
\
!
as:#
„ �.
;
!
a
=
-
|
§§§||«r«
§
■
!I
!
!!!!!!!!
!
!
|§
:::
ON
,l
NOR
ggg
§
!
!
!@!!!!!!
!
!
-
|
||■■■■■■
■
|
r
r[RRkoo
§
[
,,
�!
E
EEE0.0..
E
E
.�.�
n.
00000000
!§
f\
(}
\
§/
!�
_om
' N w
?r
❑ g
N J
' U
Z
Z
Z_ Z_
Z_
E
Q
Q
Q Q
Q Q
Q
y
N
N
N
N N
N N
N N
N
n
LL
RI
O
N
N
O
Y
U
w
U
O
m
m
m
<
r
O
r
O�
N
N
m
t0
N
m
W
N
O
a
m
a
LL
O
N
O
o
m
O
O
W
A
�
f
U
N
n
N
O
O
QW
ll
r
�
4
N
D
N
O
p
oc
c
c
c
o
O
N
N
N
M
o
N
O
C7
Z
m
N
Q
N
F
p
g
W
n
o
o
0
0
rc
a
0
0
0
�O
C
G
G
o
O
N
Q
r
Z
i
r
N
<
O
N
O
m
J
Q
r
Q
n
0
0
0 N
pp
0 0
h09 0
r
V
00000000
o
Z
<
N
N
Z
m
p
N
wU
2�
�'m�
Gc�
0
Fo
oiccoco00
zOo
O
Z
UO
U
w
1
W
WO
N
JON
r
O
O
Q
m
U O
W LL
(� S
w
w
N
O
op
m
w
a
O
0¢
N
a
r
0
I
1
1
1
1
1
z W C
m�0
00N
=w' 'az
m� S2
OW W
O
f
via
00
O
_2
J
02
2°
N
1
�NII��■1
1
�■■Y■■111
��mw�u�nn
�wmu■�muu�
�in
�misini
�mmimumnn�i
I�IIII
■
:
IIIWI
INS
I
1
1
11
1
1
O H f
z U
W Q
m'F
zW 'mz
U
m wh
W
ow 0
s�
�O
O
�w
O0
�F
Y~l�
�imdn�■i
I
Y�
�1�1@I�■YR
��191111,
Curb Cut
Q = CLH"
C = 2.67
H = height of curb = 0.5 ft
L
(length of
curb opening)
Q
(capacity of
curb cut
(ft)
(cfs)
1
0.94
1.5
1.42
2
1.89
3
2.83
4
3.78
5
4.72
6
5.66
7
6.61
8
7.55
9
8.50
10
9.44
11
10.38
12
11.33
13
12.27
14
13.22
15
14.16
16
15.10
17
16.05
18
16.99
Giro
Q/ov
USE
OP -I
a,/3
0,z9
z4"
OP-z
0,09
0,/9
Zv r
D1.2- 3
o, 2 i
0, 5 z
z,,/„
0P-S
0,L/93
/109
zy,.
r-_Z'!" Cu2,B CHT
' ,L'oa�r�us ��ia.¢auated, �Ke.
(970) 461-0550 Fax (970) 461-0551
' PROJECT NAME V��eti s
1
1
1
1
t
PROJECT NO. Z )3
BY r% DATE 9 7107
SHEET — OF —
'
r
U
W
O
^
�
4N
M
O
�D
M
O,
�O
N
3
T
v
^
v4
v�
v
v�
v�
v
N
N
N
N
Nv4
N
N
m
O
O
O
O
O
O
O
o
o
ri
�
..
O
kn
O
�/1
O
V'�
O
ij 11 (J
O
II II II II II II II
to
s
o
nov
ov
o
.a
O
1�
V)
?
a
w
o
h
am
m
o
00
O
r-
00
O
•
�
a
CG
^
�i
V1
O
M
�n
l-
DD
CD
O
Vn
O
kn
O
O
h
O
N
U
O
C
O
•--�
--�
--
,--
f V
ell
kn
v,
to
CD
0
0
0
0
0
0
U
6;i
u
a
H
x
� a II II I
M
M
M
M
M
M
0
0
0
0
0
0
0
3
p
d
o
0
0
0
0
o
c
w
o
a
�
A
x
C
U
a
o
0
0
0
0
o
c
c
o
0
0
0
0
0
0
0
0
0
0
0
F
\O
of
O
O
M
00
•--
C
R
�D
�O
--
D\
W
M
M
<
�
U
O
O
G
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
y
d
y
C
��
rn
m
�
n
o0
0o
rn
..
�n
,�
•7
v
rn
rn
S w
..
a
c
o:
u
v
y
O
'C
C
Y
d
u
�
L
U
=
u
m
�
.c
3
d
F
d
C
0�
4d
'C
.0
td.
d
.•
�
W
9
�
d
R
U
�'
y
C
•.
d
^c
�
�O
y
V
';
L
S'
C
�
.''-'
.'__"
W
L
"
�
O
�
W
L
�
•vi
'O
N
40
U',Z
'S�
'oxC7
y
A�
d
�
C
C
y•v���xQ,o
..1
ms
0
' CITY OF FORT COLLINS
1
1
I (in/hr)
time (min)
2
10
100
` 5
.2.85 .,!
- 4187
'. •9.95
- .
6
2.67
4.56
9.31
7
2.52
4.31
8.80
8
2.40
4.10
8.38
9
2.30
3.93
8.03
10
2.21
3.78
7.72 1
11
2.13
3.63
7.42
12
2.05
3.50
7.16
13
1.98
3.39
6.92
14
1.92
3.29
6.71
15
1.87 ,
3.19
6.52:
16
1.81
3.08
6.30
17
1.75
2.99
6.10
18
1.70
2.90
5.92
19
1.65
2.82
5.75
20
1.61
2.74
5.60
21
1.56
2.67
5.46
22
1.53
2.61
5.32
23
1.49
2.55
5.20
24
1.46
2.49
5.09
25:
1.43 .:
,244,
::_, 4198 -;
26
1.40
2.39
487
27
1.37
2.34
4.78
28
1.34
2.29
4:69
29
1.32
2.25
4.60
30
.. 1.30: -
.: 211 ...
432 _.
31
1.27
2.16
4.'42
32
1.24
2.12
4.33
33
1.22
2.08
4.24
34
1.19
2.04
4.16
- 35 . -
117 .:.'
2.00 ,
�_ .4?08;,-.
36
1.15
1.96
4:01
37
1.13
1.93
3.93
38
1.11
1.89 1
3.87
39
1.09
1.86
3.80
40
- L07 ..
1.83
.3i74.
41
1.05
1.80
3.68
42
1.04
1.77
3.62
43
1.02
1.74
3.56
44
1.01
1.72
331
45 _
0.99
169
3:46
46
0.98
1.67
3.41
47
0.96
1.64
3.36
48
0.95
1.62
3.31
49
0.94
1.60
3.27
50
. - 0.92�
1:58
3:23-
51
0.91
1.56
3.18
52
0.90
1.54
314
53
0.89
1.52
3.10
54
0.88
1.50
3.07
. 55
0.87
1.48
3.03
56
0.86
1.47
2.99
57
0.85
1.45
2.96
58
0.84
1.43
2.92
59
0.83
1.42
2.89
. 60
0.82 ". -
1:40.:: -
-2i86
I oaft)
time (min)
2
10
100
61
0.82
1.39
2.84
62
0.81
1.38
2.82
63
0.81
1.37
2.79
64
0.80
1.36
2.77
65• :.;%.080:
135
-, :2.75
66
0.79
1.34
2.73
67
0.78
1.33
2.71
68
0.77
1.32
2.69
69
0.76
1.31
2.67
70 "
! 475'....
:. ':I 30.
:. ;. 2.65
71
0.74
1.29
2.62
72
0.73
1.28
2.59
73
0.72
1.27
2.56
74
0.71
1.26
2.53
75.
-0:70.:
_ 1.25
2.50
76
0.69
1.23
2.48
77
0.68
1.21
2.46
78
0.67
1.19
2.44
79
0.66
1.17
2.42
-180.
`_ 065x
.:. :1 15
-_: 2.40::.
81
0.65
1.14
2.39
82
0.64
1.13
2.38
83
0.64
1.12
2.37
84
0.63
1.11
2.36
85 ...
�,0 63
' `1 10 7
235.: :
86
0.62
1.09
2.33
87
0.62
1.08
2.31
88
0.61
1.07
2.29
89
0.61
1.06
2.27
90
i' 060. _
�,-.i105 .
.,�•2i2Ss'..r
91
0.60
1.04
2.24
92
0.59
1.03
2.23
93
0.59
1.02
2.22
94
0.58
1.01
2.21
95' -'
'0.58 :
,1.00 -;,
-
2.20...
96
0.58
1.00
2.18
97
0.58
0.99
2.16
98
0.58
0.99
2.14
99
0.58
0.98
2.12
- 100:.
` 0:58: _.`'-
0.98 .
2.10
101
0.57
0.97
2.09
102
0.57
0.97
2.08
103
0.56
0.96
2.07
104
0.56
0.96
2.06
105,%:,-055
„;..
50.95...?
--2:05
106
0.55
0.95
2.04
107
0.55
0.94
2.03
108
0.55
0.94
2.02
109
0.55
0.93
2.01
110 .'_=0:55
:_'_0.93
_-,2.00
111
0.55
0.92
1.99
112
0.54
-0.92
1.98
113
0.54
0.91
1.97
114
0.53
0.91
1.96
115 :'''053
';"0.90--
..1.95''
6
0.52
0.90
1.97
0.52
0.89
1.93
8
L
0.51
0.899
0.51
0.80
0.50
0:88
1.90
No Text
SOIL SURVEY
130
'
3. Soil and water features
indicatesthe
i
cern See text for bols
kinds tion of of soils.
uch
and sm mapping
See
rms as
unit descri�ption� for
" eeof an'entry
atis
and[Absence
es
fefeature
unit
consists of two or more dominant
The symbol < means less
than; means more
than]
' composition and behavior
of the
whole mapping
unit.
Flooding
Depth to
Bedrock
Hydro-
seasonal
high
F
' Soil name and
map symbol
logic
Months
stableater
Depth
Hardness
group
Frequency
Duration
table
Feet
[.hee
t
Altvan:
_____
>6.0
>60
-----------
Moderate.
1. 2 ------------------
B
one ------'-
--------------
-
' •3, 4:
B
None --------
--------------
--------------
>6.0
j6
--- ________
-----------
Moderate.
Moderate.
Altvan part --------
B
None
--------------
--------------
Satanta part -------
--------
Aquepts:
D
Rare --------
--------------
---
0.0-1.----------
0-1.6
-----------
High.
High.
'
5 --------------------
D
Frequent ----
Long ----'---
April -June
A ril-June ---
P
----------
----------'
6--------------------
Ascalon:
>6.0
>60
-----------
Moderate. -
a ------------------
B
None ----------------------
- _____________
'7,
Bainville:
•9,
"
>6.0
20-40
Rippable __
Moderate.
Bainville part ------
C
None _--------
_____________
______________
>6.0
9-20
Rippable __
Moderate.
Epping part --------
D
None ----------------------
--------------
•10:
>6.0
20-40
Rippable __
Moderate.
Bainville Part ------
C
None --------
--------------
___._________
__-------------
j6.0
>60
-----------
Moderate.
Keith Part ---------
B
None --------
--------------
-
' Buller:
II:
>6.0
10-20
Hard -----
Low.
Buller Part ---------
D
None--------
-
- -------- ---
--------------
>6.0
20-40
Hard _--_-
Moderate.
Carnero Part _______
C
None ___________________-_
______________
•12:
_
>6.0
10-20
Hard -----
Low.
'
Buller part ---------
D
None ---------
------------
-------------
Rock outcrop part.
Blackwell:
D
Common ----
Brief -------
May -June ---
1.5
>60
-----------
High.
13 -------- -----'-----
'
Boyle:
>6.0
9-20
Rippable __
Moderate.
14, IS ----------------
D
None --------
--------------
_ _____________
•16,
>6.0
9-20
Rippable __
Moderate.
'
e part ---------
Boyle
D
None --------
--------------
--------------
>6.0
7-20
Rippable __
Moderate.
Ratake Part --------
D
None --------
--------------
--------------
Breece:
None
--------------
>6.0
>60
-----------
Moderate.
18, 19, 20 -------------
B
--------
--------------
'
Carnero:
None
- -------------
>6.0
20-40
Hard -----
Moderate.
____----
-'------------
Caruso:
C
Occasional -_-
Very brief -__
April-
>2.0
>60
-----------
Moderate.
22-------------------
September,
Clergern:
None
--------------
>6.0.
>60
-----------
Moderate.
_____---
- -------------
Connerton:
024,25:
60
-----------
Moderate.
Con____
part -----
B
Occasional
--_
Brief ---- ____
------'
---- __________
May -July ____
>6.0
>60
-----------
Moderate.
Barnum Part ____---
Barnum p
'
Cushman:
- >6.0
20-40
Rippable
-_ Moderate.
26, 27 ----------------
C
None ________
_ -------------
-------------
Dnggs'
B
None ---------
-_---___---_-
_ -------------
>6.0
>60
-----------
Moderate.
'
28, 29----------------
1
1
1
I
I
I
I
I
1
b
M
✓ / / T' 1 I
I /
I /
I /
I
I
I
1
1
/ `DEVELOPED CONDITIONS I
SUB -BASIN
DESIGN
AREA
COMPOSITE
COMPOSITE
02
010
i Q100
DESIGNATION
POINT
(AC)
C2
C100
(CFS)
(Cis)
I (CPS)
TOTAL SITE
DP10
1 1.74
0.23
0.59
15
OP2
09
096
06A
0.0133
0.2293
0B 02
0.96
0.05
0.09
0.19
C
DP3
0.07
0.50
0.74
0.10
0.21
0.52
D
DP4
0.21
0.40
0.67
0.24
0.53
1.41
101i
-19J1_-_�.: •\\ i� /i�9 CONC.RE/AIF1ING WALL
COUNTRYSIDE DRIVE
'r
I
I
t
1N t9¢Acanl
FF-14.0
uil
o i \Irr/ \�?°'�i�I
A it
v � I
I 2 1 I
/ 11 I xme All ROOF
i71 I DRAINAGE IS TO I I
\ II -
\a---�--�- -
tt I PARCEL C
_ ,
PREDEVELOPED CONDITIONS
SUB -BASIN
DESIGNATION
DESIGN
POINT
AREA
(AC)
COMPOS
C2
COMPOST
C100
Q2a
(CM)
TOTAL SIM
DP10
1.74
0.30
0.61
1.30
OFFSITE CONDITIONS
SUB -BASIN
DESIGNATION
I DESIGN
POINT
AREA
(AC)
COMPOS
C2
COMPOST
C100
Q2
(CFS)
010
(CFS)
Q100
I (CFS)
OS-1
I OP9
0.42
0.2J
0.40
0.29
0.]J
225
so
WT
T r-1 a
------------ --
_ tl
SPEED BUMP
Iar _
I
I
1
1
I
I
I
/
1
I
1
LEGEND
Renewed by
I
I
I
I
I
I
1
I
I
I
I
I
I
I
1
I
1
I
I 1
1
1
I
1
1
,
,
1
I
I
CALL BEFORE
YOU DIG
CALL UTILITY NOnFICATION
CENTER OF COLORADO AT
1-800-922-1987
www.uncc.org
GRAPHIC SCALE
m 9 10 ]0 w ao
( IN FEET )
1 Fch=20 tL
FIXFOUB loss
v
crow; eeux eoumur LARIMER COUNTY ENGINEERING DAZE PROJECT NO.
p
ASx mG m e "dinner y review constitutes compliance with these standards. Renew by the county 0213
am was maw aAsn IIHt does not constitute sprawl of the plan deign.
16Y t"o�SHEET
lnla own da a plans
ns are
renew/approval at any yrevie mf site Improvements whirl may
DP-1 % rasoste u5d qxr be spoxn. These pima are Intended! on -site
to iv for county review ai public improvements adjacent to 3A
the c warty Conor stare f on -site private it pmvmimts cannot ce until all requited
traffic plate, a r smdy(d rna ewrelapment plaunt special renew(e), and bwlamq oermns(s)
are complete, approved ma on Ale with wane, county.