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HomeMy WebLinkAboutSite Certifications - 09/09/2005 (2)Zed"* & 0444M. 906, 1435 a. e&w&wdAm (1970) 461-000 57W (970) 01-0551 as. September 9, 2005 Vpl Project No. 0 179 Mr. Basil Hamdan City of Fort Collins Stormwater Utility Department 700 Wood St. Fort Collins, CO 80524 Dear Mr. Hamdan: On September 7, 2005, we observed the site located at_ l-I 2.S S---Shields-a.ka-!3ighoth-Village H. - The detention.pond had been final graded. Based on our calculations and the informati -on from Fredrick Land Surveying, the as -built pond volumeapproximately th was approx e y e same as the approved pond volume. The approved water surface elevation was 5027.43 feet and the as -built water surface elevation is 0.01 feet higher, which is insignificant. Please set the attached calculation pages. If you have any questions, please contact me, at the above address or phone number .erel W14, ....... RE Lindsey Smith A BIGHORN VILLAGE II A rp Y6? v e A Detention Pond Volumes POND:A Delta. Volume=(D/3)(A1+A2+SQRT(AlA2)) _ ELEY AREA DELTA VOLUME VOLUME FT - FT2 FT3 FT 5023.63 0 u . v 5024 444 55 . 55 5025 10336 4307 4,362 5026 12750 11522 15,884 5027 15468 14087 29- 971' 5028 19628. 17501 _47,478 Required Volume = .37450 FT3 W.S. Elevation = Elev28 - Elev27 (Vo1Rq,,;neV0121)+EleV27 V0128 = V0127 5027.43 FT 100-year Depth (D) = 3.80 FT Orifice Qpenine Q = CA(2gH)1/2 A— Q C(2gH)12 C = 0.61 Qout = 1.31 cfs $ = 32.2 fps diam _ 0.42 FT H = D-1/2diam 359 FT A = 0.14 FT2 A = 2035 IN2. "a, 11 ory IS zooz diam 5.09 IN Use 5" diameter opening with ,trash screen Emergency Spillway QcLH3/2 = C = 2.67 H 0.5 FT Q 100 23.2 cfs L 24.58 FT BIGHORN VILLAGE II Cv '�^' ty\4� Z 5 Proposed Detention Pond Volumes -POND A Delta Volume-(D/3)(A1+A2+SQRT(AlA2)) DELTA ELEV AREA VOLUME VOLUME -- FT F T2 FT-' FV .5023.55 0, 0 0 5024 .1196.96 180 180 5025 10112.81 .4969 5,148 5026 -.14342.42 12219 11,368 5027 16741.4 15526 32,894:__ 5028 19389.12 18049. 50,943 eq = R uired Volume—:.37450 FT`3 W.S. Elevation _Elev28-.E1ev27 (Vo1R�-Vo127)+E.lev27 V0128 - V0127 _ '5027.25 FT 100=yeas Depth (D) = 3.70 FT BIGHORN VILLAGE II - ASBUILTS Detention Pond Volumes - POND A Delta Volume=(D/3)(A1+A2+SQRT(AIA2)) ELEV AREA DELTA VOLUME VOLUME FT FT2 FT3_ FTa 50213.55 0 1 0 0 5.024 82 12. 12 '5025 10799 3941 3,953 5026, 13605 12175 16,128 5027 16050 14811 30;939 5028 18645 17331 48,270 Required Volume = 37450 FT3 W.S. Elevatlon'= Elev28- Elev27 (VOIR., �Vo127)4lev27 V0128 _ V6127 5027.44 FT 100-year Depth {D) _ 199. FT Freeboard = 0.56 brer� vd PONDASB4A.txt BIGHORN VILLAGE POND AS=BUILT•VOLUME 6 SEPT 2005, GSF ELEVATION AREA(SQ FT) VOLUME(AVG) VOLUME(CONIC) . 5028.0000 18644.4985 4981.7.067.1 482516..7656 5.027.0000 .16049.8692 32469.8832 30925.7744 5026.0000. 13604.6491 - 11642.6240 16115.3460 '5025.0000 10799.:4214 ,5440.5888 3940.2717 5024...0000 81_7561 0.0000 0._0000 09/27/2005 08:00 FAX 9704959735 LOONAN ASSOC INC @ 002/002 Summary Table Bi hom Village II Date Document Volume Required Volume Freeboard Jan-02 Approved Final Drainage Report 47,478 37,450 0.57 Ma -05 Letter W relocate dention pond boundaries 50,943 37,450 0.75 S -05 As ulit leW-cartification 48,270 37,450 0.56 S RECEIVED R S E P 2 7 2005 i PONDASB4A.txt BIGHORN V.ILLAG_E POND AS -BUILT VOLUME 6 SEPT 2005 GSF ELEVATION AREA(SQ FT) VOLUME(AVG) VOLUME(CONIC) . r� N�✓.[vfQ� .i- �ip�',/ 5028.0600 18644_4985 49817.0671 48256.1656 502.1.0000 16049.8692 32469.8832. 30925.7744 6026.0000 13604.64.91 17642.6240 16115.3460 5025.00QO 10799.4214 5440.5888 3940.271.7 5024.0000 81.7561 0.0000 0.0000 Page 1. BIGHORN VILLAGE II Approved,. Detention -Pond Volumes. POND A Delta Volume=(D/3)(Al+A2+SQRT(AlA2)) ELEV AREA DELTA VOLUME VOLUME FT _ FT� - -- FT3- - --- - FT3 5023.63 0 u V 5024 444 5.5 .55 5.02-5 10336 4307 4 362 5026 12750 11522 15;884 5027 15468 14087 29,971' 5028 19628 1.7507 47,478 Required Volume = 37450 Fla W.S. Elevation Elev28 - Elev27. (Vo1p.q=Vo127)+EleV27 Vol28 - V0127 5027.43 FT 100=year Depth. (D) 3.80 FT 'lice . ening Q = CA(2gH)1/2 A= - - Q C(2gH) V2 C = 0.61 Qout = 1.31 efs . g = 32.2 fps diam = 0.42 FT H = D-1/2diam 3.59 FT A = 0.14 FT2 A = 20.35 W2 diam = 5.09 IN Emergency Spillway Q = C - 3/2 - C = 167 H = 0.5 FT Q 100 = 23.2 cfs L = 24:58 FT Use 5" diameter opening with trash screen BIGHORN VILLAGE II ASBUILTS Detention-Pond..Volumes.-.POND A Delta Volume=(D/3)(A1+A2+SQRT(AIA2)) DELTA ELEV AREA VOLUME -- VOLUME - FT - FTC FT3 - FT3 5023.55 0 0 0 5024 82. 12 12 5025 10799 :3041 3,,-953 5026 13605 -12175 10,128 5027 16050 14811 30,939 5028 18645 17331. 48,276 Required Volume = 37450 FT3 W.S. Elevation = Elev2e Elev27 (V01Req,,i.CV0121)+Elev21 V06 - Vo127 _ 5027.44 FT 100=year Depth (D) _ .3.89 FT Freeboard = 0.56 BIGHORN VILLAGE H sU ��` 6%,Aj- Z Go, P��p o s ed hty r S IV .Proposed Detention Pond Volumes - POND A' Delta Voluiiie=(D/3)(A1+A2+SQRT(AlA2)) - DELTA ELEV AREA VOLUME VOLUME - FT - - FT2 - FT-; - - -F 502155 0 0 0 5024 1196.96 180 180 5025 10212.8.1 4969 5,148 5026 14342.42 122.19 17,368 5027 167414 15526 -_ 32,894____ 5028 19389.12 18049 _ 50,943: Required. Volume = 37450 FT3 W.S. Elevation = Elev28 - Elev27 (Vol --Vo127)+Elev27 Volzg = Vol 7 502725 FT 100=year Depth (D) _ .3.70 FT A I A 44.5`1 10 +26 8 cm 0 Z 0 �`� Lo D& �5 LLJ 4-) 0- 0 -(_0 LO 0 0 3: 39004' ♦ 041 4. 44.50 F rt of A 3 24.27 1 31 TOR WAW:'-WA;M,[3 END 26.00 —EXLSTING GB BUNDAhY Ex, h1r117 FL VqtgestrionA VJ E —Z Drainage and Utility] Easement ROPOSED I, I I'BOUNDARY Lj TOE FL PAN' J4 2 L 'PAN PEDESTRIAN., DRAINAGE AND UTILITY EASEMEN --26 - - - - - - - - - - - 27 - - - - ♦JII 11 - I P - - - - - -S—BUILT CONTOURS (TYP) /fr w--t27.87 TOP + 7.25 OE SPILL F-Z 7 r garc_qe� 60 ♦ D OE ( 2 Ae, +-TVEa OE SPILL Df?,,//V29-31 -S"' W,- AG 7 -7-1 EX bldg. 2 �-ng,. 5 T :, � Lz- z -Z -Z CONTOURS (TYP) No Text 41 P'N K: il- ISM Ir