HomeMy WebLinkAboutSite Certifications - 11/12/1992Engineering Cons ulta nts
2900 South Co llege Avenu e
Fort Collins , Co lorado 80525
303/226 -4955
FAX : 303/226-49 71
November 12, 1992
Ms. Kathy Malers
City of Fort Collins
Utility Services Stormwater
235 Mathews Street
Fort Collins, Colorado 80522
RE: The Gates at Woodridge -First Filing
The Overlook at Woodridge -First Filing
Drainage Certification
PROJECT NO.: 434-002
Dear Kathy:
Please find enclosed sheets 2 and 7 of 20 from the Gates at
Woodridge -First Filing, and the overlook at Woodridge -First
Filing Utility Plans. Indicated in red on the sheets are the
verified elevations of the storm drainage facilities for Woodridge
First Filings. RBD also verified the rear lot elevations and the
flowline elevations of the channel.
As of this date, all of the drainage improvements have been
installed. The interim channel section has been graded to the
elevations as shown in red and seed and mulch has been appli e d. The
storm sewer improvements at Seneca Street are also in place, with
inverts shown in red.
In summary, the drainage improvements for the First Filing should
perform in compliance with the intent of the drainage report . The
Regional channel section does comply with the interim grading per
sheet 3 of 20 (2.5 1 min. depth), and for the ultimate grass lined
channel section, as attached and included in the Second Filing
Drainage Report (2 .8 1 depth for QlOO plus 1 1 freeboard = 3 .8 1 min
depth). When the City of Fort Collins reaches a decision regarding
the ultimate location and configuration of the future regional
detention pond in this area, the location of the concrete trickle
low flow pan can be determined.
Othe r offices : Denve r 303/458 -5526 • Va il 303/4 76-6340 • Longmo nt 303/678-9584
Thank you for your time and consideration of this Certification
submittal.
Sincerely,
RBD Inc. Engineering
Roger Curtiss, P.E.
cc: Mr.
Mr.
Gary Berger
John Hutchinson
RBD INC. ENGINEERING CONSULTANTS
CHANNEL RATING INFORMATION
ULTIMATE GRASS LINED CHANNEL ~!TH CONCRETE TRICKLE PAN
'(\ =
STA ELEV
~I 8 .,
11 I
0.00 50.00
4.00 49.00
14.00 49.00
24.80 46.30 I
27.80 46.30
27.80 45.80
31.80 45.80
31.80 46.30
34.80 46.30
49.60 50.00
g-8
SLOPE (ft/ft) ~l i -,r 'N' VALUE
................
0.033 0.0060
ELEVATION AREA VELOCITY DISC HARGE FROUDE
(feet) (sq ft) (fps) (cfs) NO.
...... ---.... --.. -.... -.. .. .. --.........
46.00 0.8 1. 1 0.90 0.44
46.20 1.6 1. 7 2.69 0.47
46.40 3.0 1.4 4.30 0.47
46.60 5.4 1.9 10. 15 0.51
46.80 8.0 2.3 18.31 0.53
47.00 11.0 2.6 28.87 0.55
47.20 14.2 2.9 41.96 0.57
47.40 17.8 3 .2 . 57.69 0.58
47.60 21.8 3.5 76.20 0.60
47.80 26.0 3.8 97.63 0.61
48.00 30.6 4.0 122.12 0.62
48.20 35.4 4 .2 149 .80 0.63
48.40 40.6 4.4 180.80 0.64
48.60 46.2 4.7 215.27 0.64
48.80 52.0 4.9 253.33 0.65
49.00 58.2 4.3 247.71 0.63
49.20 66.6 4.5 303.12 0.65
49.40 75.4 4.8 363.85 0.65
49.60 84.6 5.1 429.96 0.66
49.80 94.0 5.3 501.50 0.67
uw,. 14-A/ 32 ____ _
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