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Home My WebLink AboutLot Certifications - 11/06/1996 (7)STORMWATER RECEIVED Nlov C 1996 Mr. Basil Hamden City of Fort Collins Stormwater Utility Department 235 Mathews Street Fort Collins, CO 80522 Re: Dakota Ridge, P& e 3?Lot 58 Drainage Certification Project No. 10-746-050 Dear Basil: November 4, 1996 We conducted a survey today, November 4, 1996 on Lot 58 of Dakota Ridge; Phase 3 for the purpose of certifying the drainage facilities on or adjacent to this lot. The only facility associated with this lot is a swale along the rear (north) lot line. I have attached hereto a copy of our survey field notes showing an arbitrary bench mark of 100.00 at garage slab, a 101.23 at rear patio door, and from 93.29 to 93.66 at flowline of swale. The swale is defined on both sides by timber planter boxes and as such, we calculated the capacity of the swale which is 13.3 feet wide, approximately 0.75 feet deep and has side slopes that vary from 3:1 to 9.5:1. I have attached a basin delineation map and channel capacity calculations for your review. It is our opinion that the channel, which was designed with 4:1 side slopes is sufficient in its current condition to carry the design flows. It is also our findings that the structure is built at sufficient elevation to be above the 100 year storm flow by more than 5 feet. If you should require any additional information, please donot hesitate to call me. Respectfully, TST, TNC. CONSULTING ENGINEERS Steve F. Human, P.E. SFH/nr TST, INC. Consulting Engineers 748 Whalers Way — BuildingD Fort Collins, CO 80525 (970) 226-0557 Metro Denver (303) 595-9103 Fax (970) 226-0204 102 Invemess Terrace East Suite 105 Englewood, CO 80112 (303)792-0557 Fax (303) 792-9489 ., '. '.'... '. 4.. �..� �rr.� i. iln. i� YJ4 KT� ...-:� .:f 1w.1.T 1. ♦. 1. r. r�A '... . No Text TST, INC. 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DEPTH = TOP WIDTH = FROUDE NUMBER = SPECIFIC ENERGY= INPUT DATA: 6.692673E-01 FT O t 1.054042 FPS 3.345449E-01 FT 6.692673 FT 3.211462E-01 6.865189E-01 FT DISCHARGE = 8.900000E-01 CFS,L� Q a BOTTOM WIDTH = 0.000000E+00 FT BED SLOPE = 8.000000E-03 FT/FT SIDE SLOPE = 5:000000 MANNINGS N = 6.000000E-02 RESULTS: NORMAL DEPTH 4.642465E-01 FT E— O k FLOW VELOCITY = 8.256499E-01 FPS HYDR. DEPTH = 2.321911E-01 FT TOP WIDTH = 4.642465 FT FROUDE NUMBER = 3.019571E-01 SPECIFIC ENERGY= 4.748318E-01 FT 0 PRIVACY FENCE WOM . 1. Cbmiratar MaW nod& the Stofmwater U111ty 48 hours prkr to any constructlon MOM WM7 the IF007MILS RE-GaVAL 0YAMNa 1. The f'&7ch7g Dataff -%)omm 007 AWy To Lots 4 .2 The contractor wil work only h7 the consinvetion limits shown on this plan, and Is ra4ponsig6le for resta-bg, of/ disturbed orea to Its ov-jgkof condilka, this incivalas 2. Each QF Owner MW Be RaWans"s Ar Afarnto seed, mg. See reseedIng 4peciftatim on the rrilht side of this sheet. 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