HomeMy WebLinkAboutDrainage Reports - 09/01/1979CORNER CONSU[7INq COMPANY p.o. box 646 foRT colliNs, coloRAdo 80522 Pl w (303) 482-6650 �
MANAgEMENT/ENGINEERING
THE PIER CONDOMINIUMS
DRAINAGE REPORT
September, 1979
CORNE« CONSU[TINq COMPANY P.o. box 646 foRT collet, coloRAdo 80522 Pl-brve (303) 482-6650
MANAGEMENVENCIINEERING
September 6, 1979
Mr Bob Smith
City Drainage Engineer
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Mr. Smith:
We are pleased to submit this Drainage Report for The Pier
Condominiums.
Should you have any questions, please feel free to contact
US.
Sincerely,
CORNELL CONSULTING COMPANY
_ /I
Bill Blackwell, EIT
Chief, Design and Production
BB/ fsr
Enclosure
THE PIER CONDOMINIUMS
DRAINAGE REPORT
ABSTRACT
The Pier Condominiums is a proposed ten (10) acre development to be
located along Boardwalk Drive north of Harmony Road, a portion of
the South Half of Section 36, Township 7 North, Range 69 West, Sixth
Principal Meridian, Larimer County, Colorado. The development is
zoned Residential Planned and will consist of high density residential
units.
This report deals with storm runoff estimates, detention/storage
volume and distribution, and street flows. Calculations and recom-
mendations are based on the final grading plan submitted with the
utility plans.
I. SCOPE
The purpose of this report is to present the developer with final
engineering solutions to storm drainage problems at The Pier Condo-
miniums. In particular, the following items are addressed:
1. An analysis of the impact of a major and a minor storm
(100-year and 2-year frequency events) on the development.
2. Delineation of subbasins within the hydrologic basin and
an analysis of subbasin runoff contribution to street
flows.
3. Reservoir routing to demonstrate the final design's ability
to handle upstream flows without damage to downstream
properties.
-2-
I.I. METHODS
In general, the storm drainage analysis was completed using the
the Preliminary Draft Storm Drainage Design Criteria for the City of
Fort Collins. The Rational Method with overland time of concentration
was used to determine peak street flows for The Pier subbasins. The
Colorado Urban Hydrograph Method was used to produce an inflow hydro -
graph for routing of the upstream storm runoff through the detention
ponds. Both of these methods are more fully explained in the
referenced Design Criteria.
Routing of the major and minor storms were accomplished using a simple
computer reservoir routing model. Input was in the form of discrete
points from the storm hydrographs. Points were separated by 10 minutes
for the duration of the storm. Internally the program calculated
change of volume, head, and release rate on a one minute time interval,
but printed results on a 10-minute interval.
NKIN
III: HYDROLOGIC -HYDRAULIC INVESTIGATIONS
Refer to Appendix B, Fold -Out Drawing, for a map of the drainage
subbasins and a drainage plan showing major and minor storm discharge
rates and patterns. Subbasins on the map are defined with respect
to one or more of the following: property lines, topography, or
grading plan. This drawing is also submitted as Sheet 5 of 6 in
The Pier Condominium final utility plan set. Storm discharges for
this portion were calculated using the Rational Method as explained
in the "Methods" section of this report. Included in Appendix A
are discharges for the 100-year and 2-year frequencies for developed
conditions and the 2-year frequency for historic conditions.
Also in Appendix A are calculations from the reservoir routing for
the entire major drainage way from Larimer County Canal #2 to the
culvert under LeMay Avenue. Calculations include idealized stage -
storage curves and reservoir inflow and outflow hydrographs for
each basin.
-4-
IV. CONCLUSIONS'AND"RECOMMENDATIONS
This drainage design will satisfy all hydraulic considerations as
well as provide the future community with both a safe and equitable
solution to the problem of handling storm water runoff.
We recommend the following:
1. Storm water runoff should be routed as shown in Appendix B,
Fold -Out Drawing.
2. Detention facilities should be located and sized as shown
on Appendix B.
-5 -
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