HomeMy WebLinkAboutDrainage Reports - 12/17/1999f
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STORM DRAINAGE RE ORT
FOR(/'
218 WEST MAGNOLIA STREET.
LOCATED IN THE OLD TOWN BASIN
PREPARED FOR
DAVID EDWARDS
C/O
VAUGHT-FRYE ARCHITECTS
DECEMBER 7, 1999
PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET _
FORT COLLINS, COLORADO 80521
970/482-9331
Table of Contents
1, & 2
Letter and narrative report
3
Vicinity Map
4
Map of lot showing easements
5
Runoff coefficients
6
Historic & developed runoff, release and orifice sizing.
7
Required detention and volume of proposed pond
8, 9 &10
Basin calculations and concentration points_
11, 12, 13, & 14
Concrete drain pan along west side of lot
15
Drain chase at southwest corner of lot
16
Effect of new building on 100 year WSEL
17
Letter from Bill Wyatt, owner of property to west
18, 19 & 20
Alley vacation and easement reservation
21
1978 Photo of site
22, 23 & 24
Tables and map from Old Town Basin Master Plan
Pocket
Drainage and Erosion Control Plan
$TEWAru&sSOCIATE$
Consulting Engineers and Surveyors
' December 7, 1999
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil,
t We have prepared a drainage study of the lot located at 218 West Magnolia Street. This is
Lot 20 of the F. J. Spencer Subdivision of Lots 14, 15 and 16 in Block 103 of the City of Fort
Collins. The lot is 47.50 feet wide and 138.00 feet deep and is located on the north side of Magnolia
' Street and on the west side of a 20 foot wide alley. This site is located in the Old Town Basin, and
is located within the 100 year floodplain. A floodplain use permit application has been delivered to
the City of Fort Collins stormwater utility. The proposed new residence to be constructed on the lot
' will take the place of a residence and detached garage which were taken down a few years ago. This
residence and detached garage are shown as existing on the aerial photo which was used to determine
the floodplain in the Old Town Basin. the new structure will cause no more rise in the floodplain than
' was caused by the previous buildings. We have calculated the rise in water surface elevation to be
0.03 feet, which is less than the allowable rise of 0.04 feet.
Since the new building is located in the 100 year floodplain, no basement will be constructed,
and the floor of the crawl space area will be placed at 1.5 feet above the base flood elevation, which
is 4993.4 at this site. The proposed lowest floor of the residence is at elevation 4997.65 and the
garage floor will be at 4994.90.
The existing site is a graveled parking lot which is used by the First National Bank. There is
a 1978 aerial photo which shows the site with the original residence and detached garage. A site
runoff coefficient of 0.5 is calculated using this original house and garage as hard surface, and that
is equal to the existing graveled site runoff coefficient of 0.5.
The Old Town Master Plan indicates 70 percent. imperviousness for this developed site and
' the proposed new site is about 85 percent impervious. It is proposed to provide detention on the site
for the additional amount of runoff generated by the increase in imperviousness. The amount of
required detention is calculated to be 365 cubic feet, and the proposed detention ponding area will
' be in the new concrete driveway which will be located on the vacated alley along the east side of the
site. This alley was vacated by the Fort Collins City Council by Ordinance No. 160 which was
recorded at reception number 98091890 on October 21, 1998. The vacated alley was reserved as an
' easement for utilities, drainage and emergency access by the Ordinance. .
James H. Stewart
' and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
' 970/482-9331
Fax 970/482-9382
There is offsite runoff onto the site from the existing building and parking lot located just west
of the site. This offsite runoff will be routed south to Magnolia Street in a concrete pan which will
be constructed along the west line of the 218 W. Magnolia site. The west portion of the 218 W.
Magnolia site will also drain off the roofs into this concrete pan. The east portion of the site will
drain into the detention pond in the driveway along the east side of the site. The release from the
detention ponding area will be through the curb which will be installed along the west side of the
driveway. This release flow will be carried from the curb opening by a 4 inch diameter pipe which
will be extended southwesterly across the front of the site, on private property, to tie into the curb
chase which is proposed to be constructed from the west side of the site out into the gutter on
Magnolia Street. A restriction plate with an orifice opening will be placed over the entrance to the
4 inch diameter outflow pipe. The restriction plate will be fastened to the curb face.
Any overflow from this detention ponding area will be over the high spot in the driveway and
into W. Magnolia Street.
The concrete pan to be constructed along the west property line will be set low enough so that
' it does not block any flows from the property to the west, and some minor grading may be required
on the easterly 2 or 3 feet of the property to the west. The owner of the property to the west is Bill
Wyatt, and he has given a license to come onto, and utilize, the easterly portion of his lot to construct
' the drainage facilities on the west side of the 218 site.
There are no practical ways to provide water quality measures for this site. The existing site
' has been used as a parking lot for the First National Bank for several years, and by eliminating the
parking lot and constructing a residence with some landscaping, there will probably be a reduction
in the oils, salts and other harmful particulates which were deposited on the site and then washed into
the street gutters. A variance from the requirement for water quality measures is hereby requested
for the 218 W. Magnolia site.
A silt fence shall be installed along the south and east property he during the grading process.
The minimum erosion control collateral of $1000 will apply on this project.
Drainage calculation sheets are included in this report
' A copy of the 1978 aerial photo showing the original residence and garage is also included
in this report, along with tables and a flood plain map from the Old Town Master Drainage Plan.
' A copy of the Drainage and Erosion Control plan is included in the pocket of this report.
This report was made in compliance wittyofFort Collins Criteria.
*seeSincerely, �a����e(jNsTE
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PH. 482-FAX 482-9382
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PH. 482-9331 FAX 482-9382
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City of Fort Collins
Planning Department
Fort Collins, Colorado
Vaught -Frye Architects
I10 Stoney Hill Drive
Fort Collins, Colorado 80525
Re: David and Paula Edwards Project
218 West Magnolia Street
Fort Collins, Colorado
Ladies and Gentlemen:
970 =4 1662 F. 01: c 1
This letter will confirm that I am an owner of 222 West Magnolia Street, which lies
adjacent to the lot at 218 West Magnolia Street owned by David Edwards and Paula Edwards.
I am aware that there will be a drainage easement on the western portion of the Edwards'
property, adjacent to my property, that will drain water from the Edwards' lot into Magnolia
Street. I am also aware that when the drain is constructed, it will be necessary for the contractor
to come onto the easterly portion of my lot.
The purpose of this letter is to confirm to you that the Edwards and their contractor are
granted a license to come onto, and utilize; the easterly portion of my lot (between my building
and the Edwards' lot) to construct the drainage easement facilities on the westerly portion of the
Edwards' property. Such license shall endure for one year from the date of this letter.
Sincerely, _...J
r�
Tf-MAI P . n I
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ORDNANCE NO. 160, 1998
OF THE COUNCIL OF THE CITY OF FORT COLLINS
VACATING PORTIONS OF THE RIGHT-OF-WAY FOR AEI
ALLEY DEDICATED N BLOCK 103 OF THE CITY OF FORT COLLINS
wi
w w WHEREAS, the plat of the Original City of Fort Collins dedicated to the public an alley
n
ty right-of-way within Block 103; and
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a WHEREAS, the Current Planning Department is considering a proposal for a project entitled
NF "Kruger OfficeBuilding,(Lot20ofF.J.SpencerSubdivision)",whichabutssaidalleyright-of-way;
w a and
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a rn
WHEREAS, the approval of said project requires the vacation of the alley right-of-way
" 0 dedicated adjacent to Lot 20 more particularly described on Exhibit "A", attached hereto and
incorporated herein by this reference; and
o >.
o e-
o z WHEREAS, said portion of the alley right-of-wav is no longer necessary or desirable to
" retain because a portion of the alley was previously vacated and the portion proposed for vacation
w serves only driveway and emergency access purposes; and
s
m z WHEREAS, pertinent City agencies and private utility companies have been contacted and
a reported no objection to the proposed vacation, provided that an easement for utility, drainage and
emergency access be reserved unto the City; and
a:
ow
WHEREAS, the rights of the residents of the City of Fort Collins will not be prejudiced or
o w injured by the vacation of said alley right-of-way.
as
a NOW, THEREFORE, BE IT ORDAINED BY THE COUNCIL OF THE CITY OF FORT
c 0 COLLINS that the portion ofalley right-of-way more particularly described on Exhibit "A"is hereby
co w vacated, abated and abolished, reserving the same unto the City as an easement for utility, drainage
u z and emergency access purposes.
w
zc
ate. z Introduced, considered favorably on first reading, and ordered published this kith day of
a s September, A.D. 1998, and to be presented for final passage o y of October . . 1 98
�.
Mayor
ATTEST:... ,
City Clerk p
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r•,:
Ira
Passed and adopted on final reading this 6th day of October 11998.
Mayor
City.CWrk '"'
PROPOSEo ALLEY VACATION -IN BLOCK 14
C/TY OF FORT COL-UN5. COt09.920
Exhibit A
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DESGB=OZN OFALLBYTO BE VACATED
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A twenty (20.00) foot wide Cley located m Bloctc 103 ofthe Cly ofF= Ca bL% Color -do,
vAlich is corrzked within the 6ossdary fixes whkh bed at the Southwest come: ofLot 1 k said,
Block 103 =d = these West 20.00 feet to the South= came: of Lot 20 is said Block 103;.
the=ce Ncra 150.Oo fe-- ^� the easte3y L^e cfLot 20 =d along the c=cdy E e of a 12 fact
wider v. d: ve to the Sota`rst cow ofIat 133 m said Black 103; thece E= 20.00.4 a to
the Nozd ik. came: of Lot 3 a said Block 103; then South 150.00 fc--•along the wexe3y
lives of Lots 1, 2, and 3 itt said Block 103, to the point of begi=kS.
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:. i�JY'.s��:�: � - -? : ! ' t ♦ 1 �'; i(r v.t...c a..�'♦'`sftid. +�A
IF
:I1Ili .1, •. � IT� „_� " ''�• -. �,1
•� II,i III :•• y 'GF._ - _ / •.
il,t ..4 r r I. s .IR • f
Lt
,j
r.. Ulm
R L.
II
II
Table 4.3. Differences in Impervious Area Percentages for
Existing and Future Conditions.
Subcatchment
Number
Percent Impervious
Existing
Future
6
40
70
102
50
70
108
40
60
109
40
60
201
40
60
203
50
70
204
60
70
205
50
70
206
40
60
211
40
60
304
40
60
305
40
60
312
40
50
360
20
40
361
60
100
Z3
m
N
u)
m
m
uD
m
m
Lq
N
O
r`
N
LLt
to
cD
m
m
f
m
m
m
m
m
O
m
N
m
N
m
m
m
m
m
m
m
a
m
a
m
m
m
v
m
m
m
m
m
m
m
m
m
m
m
m
a
m
a
m
a
m
a
m
a
a
a
a
a
a
a
a
a
a
a
m
r
0
a
a
m
;
0
0
0
0
0
0
0
0
0
0
0
0
0
o
0
m
0
o
0
0
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
co
m
m
n
m
m
m
O
m
m
m
m
CO
o
a
m
N
a
iD
O
lD
"'•
.4
ui
r
ai
O
N
m
N
m
ci
m
m
m
of
ar
d
m
a
m
m
-
N.K..
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
r
o
0
$
0
0
0
0
0
0
0
0
0
0
0
0
0
y
n
U
0
0
0
o
m
m
m
m
a
D
u1
m
ID
0
m
o
N
m
N
0
to
0
rD
IJ.:
ID
lD
tD
u1
in
C
>j
Y
C
0
U
m
m
m
m
m
m
m
m
a
m
m
m
m
m
u
a
m
m
m
m
f`
m
m
m
m
ma)
N
N
m
m
m
m
m
m
m
m
m
a
m
m
m
c
m
m
m
m
m
m
m
rn
m
m
m
m
m
m
m
m
m
t
m
r
N
O
O
O
0
O
0
O
O
O
O
0
O
m
O
0
O
a
O
m
O
m
m
U
N
N
m
C
> tL
N
N
N
N
N
0
.Y
m
m
m
0
—
m
m
u7
m
N
N
N
m
N
Na)
ul.
a
ui
m
m
r�
m
m
N
N
N
m
vi
m
m
m
m
m
m
m
m
a
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
>,
s W
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
m
C
m
y
r
c
d
O
0
0
0
0
0
0
0
0
00
m
o
o
m
m
�
V
m
N
m
m
'a
0
Q
0
n
m
0
r,
a
m
n
r`
N
0
U�a
vi
av
co
m
m
00
a
co
C`
m
of
m
m
m
vi
m
v
m
m
mmma)a)avas
aa
a
a
a
a
a
�
c 3
�
O
O
O
O
O
O
O
O
N 0
0
O
0
0
O
O
m
�
c
m
m
m
m
m
m
o
v
m
m
ro
ai
rn
0
m
m
N
m
m
m
m
m
D
m
> 3=
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
= o
m
a
m
a
m
a
m
a
a
a
a
a
a
a
a
a
a
a
a
m
c
e
b:
c
0
0
0
0
0
0
0
0
0
N
0
m
0
a
0
0
0
r`
0
m
0
m
D
m
m
m
n
rn
m
n
O
m
m
m
m
m
m
m
r,
n
m
m
m
m
m
m
L
m°
a
N
m
a
rD
m
n
m
a
m
a
O
m
m
N
m
m
m
a
m
tD
D
U
d
U
Q z
a
a
a
a
a
a
�i
5.17
All V
w
4 AL \: •'%� �..� . ^ . • raw_ i' (. � ` � ' n ' . , 1
• , �•
r 04
II11
�•F•A)�s"jy
A r= I
OIL
-00
.� YMeA j j � ,�, . •rr' l� .'� Y, •• y,.. <a. a-' JI ,` ,l � !`0
•+! `.�,�` .Si.�• �.i_ UP
J � k
. vt :r. ) i..../�,./'� •l`" _'�•'% '-.,y+`y„HrF a tra29Y6?k1V.'
-,MASON A
14
1 a
• a
'4' ra(� e'F7 k � r • A v, �
•� r.
t;
V.
70+00 /902
Ilk A
I 'VHIYM,r~ �vMYl,n1iMOINg�P'..Ner4ii•WYxM.I.n..
.iia.+.rn�Yi1•�
Figure 5.6: REACH 4
FLOODED AREAS
OLD TOWN MASTER DRAINAGE
BASIN PLAN
CITY of FORT COLLINS
DECEMBER , 1992
NOTES:
1. For Location of Map, see ktdoa• Figure 5.1
2. For Prolifo, see Figure 5.15
3• For Flood Elevations, see Table 5.1
4. 0oso Mop from May -July 1978 Aerial Photographs
by M&I Consulting Engineers and from May 1984
Aerial Photographs oy Arix Corp.
it
LEGEND:
I
TJ
M
too Year rood Limits
10 Year Flood Limits
Cross Section I.ncauon
and noforonco (tanner
5000
100 Yr. Flood Water
Surface Contours
4k