HomeMy WebLinkAboutGrading Plans - 06/23/2025TRI-PEAKS
306 E. Elizabeth St. • Fort Collins • Colorado • 80524
office (970) 232-9482
cthew@tri-peaks.com
June 12, 2025
City of Fort Collins
Stormwater Utility
700 Wood Street
Fort Collins, CO 80521
Re: Drainage Memorandum
1616 S. Whitcomb Street
Fort Collins, CO 80526
We are pleased to submit this letter to for the analysis of 1616 S. Whitcomb
located in Fort Collins Colorado. In general this is a summary of the stormwater
impacts associated with the proposed site improvements shown on the attached
Site/Grading Plan.
The 1616 S. Whitcomb Residence site (referred herein as “site”) is situated 300
feet south of Prospect Ave on the East side of S. Whitcomb Street. This site is
also known as Lot 89 of the Arthur C. Shelly 3rd Subdivision. The planned
improvements on the site consist of the demolition of the existing structure and
construction of a new single-family residence utilizing the existing foundation with
the addition/expansion of the residence placed over a crawlspace. Removals
and additions to the concrete hard surfacing of sidewalks and patios to support
the structure are shown as planned.
The existing site is located in the Spring Creek Drainage Basin and is a 7200
square foot lot/parcel. The site drains via overland flow to the east and west with
a “Type B” grading per the Fort Collins Stormwater Criteria Manual (FCSCM).
The roofline of the existing structure similarly drained east and west split at the
centerline peak of the residence. Drainage along the front of the site then flows
north via the roadway infrastructure, and in the back of the site flows are directed
south along an existing retaining wall through the back of adjacent lots.
The proposed site improvements as shown in the Site/Grading Plan were found
to increase the Overall Site Impervious area of the site by 792 square feet. The
peak of the residence is proposed to be rotated shedding flows north/south with
the proposed gutters intended to direct the majority of the proposed roof drainage
to the front to the lot. An analysis to the back of the lot was performed and it
would found to decrease the impervious area drained to the east by 92 square
feet. Gutter direction and downspouts are shown on the Site/Grading Plan to
direct flows as intended.
Grading/Stormwater Plan Accepted
(Building Permit Released)
Accepted by:
Date :
Dan Mogen
06/23/2025
LOT 89, ARTHUR C SHEELY 3RD, FTC
Permit B2501887
N 89°59'00" W 102.01' (M)
N
0
0
°
0
8
'
2
5
"
E
6
9
.
8
9
'
(
M
)
N 89°55'26" W 102.63' (M)
S
0
0
°
2
2
'
0
0
"
E
7
0
.
0
0
'
(
R
)
31
5
.
0
0
'
(
R
)
N 90°00'00" W 101.83' (R)
N 90°00'00" W 102.28' (R)
N
0
0
°
0
0
'
0
0
"
W
7
0
.
0
0
'
(
R
)
52
.
0
'
24.0'
52
.
0
'
24.0'
10
.
6
'
7.
3
'
30.1'
EXISTING
RESIDENCE ON
FOUNDATION
TO BE REPLACED
FF = 5020.4
1248 S.F.
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10' UTILITY EASEMENT (PLAT)
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CONCRETE WALL WITH
CHAIN LINK FENCE
LIES +/- 1.2' EAST
OF PARCEL LINE
LOT 89
THE ARTHUR C. SHEELY
THIRD SUBDIVISION
RECEPTION NO. 686675 (1954)
12
.
5
'
30.3'
EXISTING CONC.
DRIVE AND SIDEWALK
645 S.F.
TO REMAIN/
BE REPLACED
30.2'
4.
0
'
EXISTING CONC. WALK
AND STEPS
TO BE REMOVED
121 S.F.
PROPOSED
ADDITION
ON CRAWLSPACE
FF TO MATCH
520 S.F.
13.0'
40
.
0
'
13.0'
PROPOSED
CONC. PATIO
@ FF ELEV.
325 S.F.
EX.F.G.=5017.9
EX.F.G.=5017.2
EX.F.G.=5017.6
EX.F.G.=5017.9
EX.F.G.=5019.1
EX.F.G.=5019.1
EX.F.G.=5019.4
EX.F.G.=5019.4
21.0'
24
.
0
'
12.0'
3.0'
5.
0
'
STEPS
AS NEEDED
15 S.F.
30.2'
4.
0
'
PROPOSED WALK
AND ENTRYWAY 121 S.F.4.
0
'
EX
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W
A
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4.
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9.0'
20
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10
.
6
'
35.0'
7.
4
'
10
.
6
'
GUTTER
PROPOSED PEAK
EXISTING
ROOF DRAINAGE
REMOVED
FROM BACK YARD
624 S.F.
GUTTER GUTTER
GUTTER
GUTTER
EX
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T
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P
E
A
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ADDITIONAL (HATCHED) DRAINAGE
AREA TO BACK YARD (EAST)
532 S.F.
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BRONER SITE/GRADING PLAN
,
SITE INFO:
LOT 89, ARTHUR C SHEELY 3RD, FTC
1616 SOUTH WHITCOMB STREET,
FORT COLLINS, COLORADO 80526.
OWNER:
ISREAL BRONER
ISBRONER@GMAIL.COM
EXISTING IMPERVIOUS AREA:
RESIDENCE:1,248 S.F.
WALK/DRIVEWAY 834 S.F.
TOTAL 2,082 S.F.
PROPOSED IMPERVIOUS AREA:
REPLACED RESIDENCE 1,248 S.F
ADDITION 520 S.F.
PATIO/STEPS 340 S.F
WALK/DRIVEWAY/ENTRYWAY 766 S.F.
TOTAL 2,874 S.F.
NET IMPERVIOUS AREA: 792 S.F.
SETBACKS:
NORTH / SIDE: 5 FT.
REAR / EAST SIDE: 15 FT.
SOUTH / SIDE: 5 FT.
FRONT / WEST SIDE: 20 FT.
DS
DS
DS
BACK YARD (EAST) IMPERVIOUS AREA:
EXISTING ROOF REMOVAL 624 S.F
ADDITIONAL IMP. AREA (HATCHED)532 S.F
NET -92 S.F.
Grading/Stormwater Plan Accepted
(Building Permit Released)
Accepted by:
Date:
Dan Mogen
06/23/2025
Permit B2501887