HomeMy WebLinkAboutPEAK VIEW - MAJOR AMENDMENT - 26-00B - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT-0,
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*** PROJECT TITLE: Peeakview Sub
*** CURB OPENING INLET HYDRAULICS AND SIZING:
INLET ID NUMBER: 2
INLET HYDRAULICS: IN A SUMP.
GIVEN INLET DESIGN INFORMATION:
T r-tr� ",
GIVEN CURB OPENING LENGTH (ft)= 10.00
HEIGHT OF CURB OPENING (in)= 6.00
INCLINED THROAT ANGLE (degree)= 0.00
LATERAL WIDTH OF DEPRESSION (ft)= 2.00
SUMP DEPTH (ft)= 0.25
Note: The sump depth is additional depth to flow depth.
STREET GEOMETRIES:
STREET
LONGITUDINAL
SLOPE (%) =
1.00
STREET
CROSS SLOPE
(%) =
2.00
STREET
MANNING N
=
0.016
GUTTER
DEPRESSION
(inch)=
1.50
GUTTER
WIDTH
(ft) =
2.00
STREET FLOW HYDRAULICS:
WATER SPREAD ON STREET (ft) = 20.13
GUTTER FLOW DEPTH (ft) = 0.531*'�
FLOW VELOCITY ON STREET (fps)= 3.96
FLOW CROSS SECTION AREA (sq ft)= 4.18
GRATE CLOGGING FACTOR (%)= 50.00
CURB OPENNING CLOGGING FACTOR(%)= 20.00
INLET INTERCEPTION CAPACITY:
IDEAL INTERCEPTION CAPACITY (cfs)= 23.70
BY FAA HEC-12 METHOD: DESIGN FLOW (cfs)=
FLOW INTERCEPTED (cfs)=
CARRY-OVER FLOW (cfs)=
BY DENVER UDFCD METHOD: DESIGN..FLOW (cfs)=
FLOW INTERCEPTED (cfs)=
CARRY-OVER FLOW (cfs)=
16.50
16.50
0.00
16.50
16.50
0.00
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D .'P 2-
•---------------------------------------- -----F_ irme�-----------
UDINLET INLET HYDARULICS AND SIZING DrAanAf6 �)tj
10 DEVELOPED BY 1
DR. JAMES GUO, CIVIL ENG DEPT. U OF COLORADO AT DENVER
SUPPORTED BY METRO DENVER CITIES/COUNTIES AND UD&FCD
- ---------------------------------------------------------------------
SER:KEVIN GINGERY-RDB INC FT. COLLINS COLORADO..................
ON DATE 01-28-2002 AT TIME 12:05:09
** PROJECT TITLE: Design Pt 2
�O 2
*** CURB OPENING INLET HYDRAULICS AND SIZING:
p^2
INLET ID NUMBER: 2
INLET HYDRAULICS: IN A SUMP.
GIVEN INLET DESIGN INFORMATION:
GIVEN CURB OPENING LENGTH (ft)=
10.00
HEIGHT OF CURB OPENING (in)=
6.00
INCLINED THROAT ANGLE (degree)=
0.00
LATERAL WIDTH OF DEPRESSION (ft)=
2.00
SUMP DEPTH (ft)=
0.25
Note: The sump depth is additional
depth to flow
depth.
STREET GEOMETRIES:
STREET LONGITUDINAL SLOPE (%) =
1.00
STREET CROSS SLOPE M =
2.00
STREET MANNING N =
0.016
GUTTER DEPRESSION (inch)=
1.50
GUTTER WIDTH (ft) =
2.00
STREET FLOW HYDRAULICS:
WATER SPREAD ON STREET (ft) =
19.19
GUTTER FLOW DEPTH (ft) =
0.51
FLOW VELOCITY ON STREET (fps)=
3.85
FLOW CROSS SECTION AREA (sq ft)=
3.81
GRATE CLOGGING FACTOR (%)=
50.00
CURB OPENNING CLOGGING FACTOR(%)=
20.00
INLET INTERCEPTION CAPACITY:
IDEAL INTERCEPTION CAPACITY (cfs)=
23.42 '�
BY FAA HEC-12 METHOD: DESIGN FLOW
(cfs)=
14.53
FLOW INTERCEPTED (cfs)=
14.53
CARRY-OVER
FLOW (cfs)=
0.00
BY DENVER UDFCD METHOD: DESIGN FLOW
(cfs)=
14.53
FLOW INTERCEPTED
(cfs)=
14.53
CARRY-OVER
FLOW (cfs)=
0.00
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In summary the proposed siteplan change increases the flow slightly and thus the depth of flow
increases at the catch basin design (point 2) about 1/4 of an inch. The increase in the flow depth
meets the city criteria.
Please call after your review so we may discuss the steps needed to get final approval for the
proposed siteplan change.
Sincerely,
EDRC
traij C. Hgtudeshell, P.E.
President Jj
cc: Design Development
Loonan and Associates
Vicki Wagner
enclosure
•
July 31, 2002
•
P
RING DESIGN &H CORPORATION
Mr. Glenn Schlueter
City of Fort Collins, Utilities Department
700 West Street
Fort Collins, CO 80521
RE: Drainage Revisions
Peakview Subdivision
Dear Glenn:
co"
Attached for your review are revised hydrology calculations needed due to proposed revisions of
the subject site. The City approved siteplan had single family homes that are proposed to be
replaced with five town homes. Thus, the amount of imperious area has slightly increased. The
purpose of this letter is to show that the approved drainage collection system is. capable of
conveying and containing the slight increase in discharge.
The following table summarizes the approved condition and the newly proposed condition. The
"approved" condition parameters listed below are from the project's final drainage report as
approved by the City.
SUMMARY TABLE OF HYDROLOGIC
AND HYDRAULIC CONDITIONS
PARAMETER
APPROVED
PROPOSED
Impervious Ratio
0.72/1.25
0.83/1.25
2-year design discharge
2.67
3.7
100-year design discharge
14.42
16.5
Depth of gutter flow (100-yr)
0.51
0.53
Attached to this letter is:
1) Revised Time to concentration for sub -basin F
2) Revised post -development hydrology for sub -basin F
3) Approved inlet capacity calculations for curb inlet
4) Revised inlet calculation for additional flow
303-873-6603 • Fax - 303-873-6604
2280 South Xanadu Way • Suite 350 • Aurora, Colorado 80014