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June 5, 2017
DRAINAGE ANALYSIS LETTER FOR
1212 Riverside
Fort Collins, Colorado
Prepared for:
City of Fort Collins
Prepared by:
■� NORTHERN
ENGINEERING
301 N. Howes Street, Suite 100
Fort Collins, Colorado 80521
Phone: 970.221.4158 Fax: 970.221.4159
www.northernengineering.com
Project Number: 100-021
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NorthernEnnineerino.corn // 970.221.4758
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June 5, 2017
NORTHERN
ENGINEERING
Mr. Shane Boyle
City of Fort Collins
Stormwater
700 Wood Street
Fort Collins, Colorado 80524
RE: 1212 Riverside Avenue, Drainage Analysis
Fort Collins, Colorado
Dear Shane:
The site improvements for 1212 Riverside Avenue consists of renovating the existing building and
parking lot into performing arts school and commercial space. The subject site is currently
composed of a large masonry building and hardscape (asphalt and concrete) parking lot. The
project consists of the eastern half of the existing building, eastern truck dock, and eastern parking
lot.
The site was divided into three drainage basins:
' 1. Basin A: The western driveway of the eastern parking lot up to the covered entrance along
Riverside Avenue. The basin includes roof drainage from the two downspouts immediately
west of the building entrance and surrounding landscaping.
' 2. Basin B: The eastern driveway, parking lot, and roof drainage immediately west of the
covered entrance. Basin B does not include any drainage at the foot of the eastern truck
dock.
1 3. Basin C: The immediate area around the eastern truck dock collected by an existing trench
drain and discharged through the building towards the north.
' Basin A:
' The existing and proposed drainage patterns for Basin A remain unchanged. Drainage from the roof
and covered entrance sheet flows south towards the curb and gutter along the southern edge of the
parking lot. Drainage will then flow along this existing curb and gutter towards the western
' driveway and into the existing curb and gutter on Riverside Avenue.
The proposed improvements to Basin A include realigning the western driveway, a concrete plaza
area at the western end of the proposed improvements, and replacing the sidewalk along the front
' of the building. The improvements to Basin A will increase the impervious area (see Table 1), but
the proposed improvements in the adjacent basins will result in a decrease in the area and flowrate
for Basin A (see Table 1). The proposed 100-year flowrate for Basin A is 3.46 cfs (see Table 1).
' 301 N. Howes Street, Suite 100, Fort Collins, CO 80521 I 970.221.4158 I www.northernengineering.com
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' Basin B:
NORTHERN
ENGINEERING
Table 1: Basin A Drainage
Characteristics
Existing
I Proposed
Basin Area (sq. ft.)
19,508
17,454
Impervious Area (sq. ft.)
17,442
16,272
Percent Impervious
88.2%
89.2%
2-Year Flowrate (cfs)
0.87
0.79
10-Year Flowrate (cfs)
1.48
1.35
100-Year Flowrate (cfs)
3.78
3.46
' The existing drainage pattern for Basin B begins with drainage from the roof discharging from four
downspouts: two in front east of the covered entrance and two near the truck dock behind an
existing transformer. The stormwater will then sheet flow across the existing parking lot towards the
' southeast at the southeast corner of the property. Curb and gutter along the south of the parking
lot, and a retaining wall along the east property line, collects and directs the drainage towards the
existing curb and gutter in Riverside Avenue via the eastern most driveway.
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The proposed drainage patterns from the front two existing downspouts and parking lot will only
vary slightly from the existing drainage pattern. Two proposed sidewalk culverts, one with as swale
and the other with a concrete chase, will direct the drainage away from the eastern driveway and
into the existing curb and gutter along Riverside Avenue. However, the two rear downspouts near
the existing transformer will discharge into the existing trench drain in Basin C. The proposed
improvements in Basin B will result in a decrease in the impervious area, basin area, and flowrate
in Basin B (see Table 2).
Table 2: Basin B Drainage
Characteristics
Existing
Proposed
Basin Area (sq. ft.)
27,899
20,367
Impervious Area (sq. ft.)
26,623
18,361
Percent Impervious
92.9%
86.6%
2-Year Flowrate (cfs)
1.35
0.86
10-Year Flowrate (cfs)
2.31
1.47
100-Year Flowrate (cfs)
5.91
3.76
Basin C:
The existing drainage pattern for Basin C consists of sheet flow across the existing concrete towards
a trench drain at the base of the existing eastern truck dock. The trench drain discharges, under
the existing building, through a 6 inch PVC pipe into the existing Great Western Railway right-of-
way along the northern property line. The overflow for Basin C is through a slot drain in the existing
retaining wall along the east property line, across an existing asphalt parking lot, and into the Great
Western Railway near the discharge of the 6 inch PVC pipe.
301 N. Howes Street, Suite 100, Fort Collins, CO 80521 1 970.221.4158 1 www.northernengineering.com
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NORTHERN
ENGINEERING
Due to the proposed raised plaza, drainage area for Basin C is increased to include the discharge
from two existing roof drains. The two roof drains behind an existing transformer discharges into
Basin B under pre -developed conditions, and they will discharge into the trench drain in Basin C
under post -developed conditions. The area within the immediate vicinity of the truck dock will
continue to discharge into the trench drain in Basin C. The overflow for Basin C remains at the
existing slot drain in the retaining wall along the east property line. The proposed improvements
result in an increase in the basin area and flowrate (see Table 3). The impervious area for Basin C
remains the same (see Table 3).
Table 3: Basin C Drainage
Characteristics
Existing
I Proposed
Basin Area (sq. ft.)
1,360
10,947
Impervious Area (sq. ft.)
1,360
10,947
Percent Impervious
95.0%
95.0%
2-Year Flowrate (cfs)
0.07
0.57
10-Year Flowrate (cfs)
0.12
0.97
100-Year Flowrate (cfs)
0.31
2.47
Total Impervious Area:
Table 4: Total Impervious Area
Existing
Proposed
Basin A (sq. ft.)
17,442
16,272
Basin B (sq. ft.)
26,623
18,361
Basin C (sq. ft.)
1,360
10,947
Total Impervious Area (sq. ft.)
45,425
45,580
' For the entire project, there is a net increase of 155 square feet of impervious area (see Table 4).
City of Fort Collins Stormwater Requirements does not apply since the change in impermeable area
' is less than the allowable increase of 350 square feet.
Impacts to Adjacent Streets and Properties:
' The stormwater impact on the adjacent streets and properties along Riverside Avenue from this
project is negligible. The proposed improvements will result in a decrease of the 100-Year Storm of
2.47 cfs within Riverside Avenue. There will be no adverse impact from the proposed
improvements to the existing infrastructure along Riverside Avenue.
The stormwater impact the Great Western Railway right-of-way is a net increase of 2.16 cfs for the
100-Year Storm.• The Great Western Railway right-of-way consists of an existing swale that
ultimately discharges into the Cache la Poudre River. The additional 2.16 cfs will discharge into
this existing swale. The additional discharge will not have a significant impact on the Great
' Western Railway right-of-way.
' 301 N. Howes Street, Suite 100, Fort Collins, CO 80521 I 970.221.4158 I www.northernengineering.com
NORTHERN
ENGINEERING
NORTHERN ENGINEERING SERVICES, INC.
Frederick S. Wegert, PE
Project Engineer
. Pp 0 L /CF
ry � 'scoir' �iS
45018 ^7
S3/ONA� ECG\
301 N. Howes Street, Suite 100, Fort Collins, CO 80521
970.221.4158 1 www.northernengineering.com
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