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Home My WebLink AboutLot Certifications - 12/30/2014City of Utilities electric. stornwater. wastewater. water 700Wood St. Fort Collins PO Box 580 Fort Collins, CO 80522 / \ 97D.221.6700 970.221.8619619 fax . 970.224.6003 TDD utilitiesofcoovcom . fcgov.comrumities CERTIFICATION OF LOT GRADING Pursuant to City Code 26 6-544 and City Land Use Code 4 3.2.2 (e) Date: December 29, 2014 �FZ Permit Application No. B1401935 CD rataasect Y5'/2o14 Address: 5626 Conoervein Street ' 1 Lot 4 Block: 4 Subdivision: Kechter Crossing Planning Land Division Filing Two I,(Print) Steven M. Stricklino , a Colorado registered professional engineer, verify that the above referenced property in the City of Fort Collins, Colorado, has been inspected by me or an appropriately qualified professional under my direct supervision, and verify that construction of all stormwater facilities and grading is complete, and that the elevations and drainage patterns shown on the attached drawing(s) which were developed from a survey performed on (Date): December 24, 2014 , accurately and truly depict the elevations and drainage patterns as they existed on the date of the survey. Based on this information, I certify that (check one): ❑ The elevations and drainage patterns of the lot/site are in substantial conformance with the City approved yirainage and grading plan for the property (information attached). SEE NOTE. The elevations and drainage patterns of the lot/site as measured are in general conformance with the City approved drainage plan with exceptions (information attached). In my professional judgment the elevations and grading of the IoUsite as constructed are functionally adequate and equivalent to the specifically approved drainage plan, and will affect stormwater drainage on and off the IoUsite in a manner consistent with the approved drainage plan. SEE NOTE. Nn 10056 Brisbane Lane, Littleton CO 80130 (address of signing party) NOTE: A COMPLETE certification must be submitted at least two weeks prior to a request for a Certificate of Occupancy for the lot/site, including but not limited to drawings of the lot/site showing the approved design and as -built surveyed elevations of all structures, drainage and grading features (e.g. swales, retaining walls, lot comers), written information/explanation of discrepancies, and other information necessary to confirm the above certification to: Fort Collins Utilities 700 Wood Street Fort Collins, CO 80521 (970) 221.6700 Pev. t27/12 At least Two Weeks Prior To Requesting A CerGtication Of Occupancy For The Property civas engineering December29, 2014 civil enginaenngwmfuns FORT COLLINS UTILITIES 700 Wood Street Fort Collins, Colorado 80521 Re: Lot 4, Block 4, Kechter Crossing Planning Land Division Filing Two Certification of Lot Grading The lot grading for Lot 4, Block 4, Kechter Crossing Planning Land Division Filing Two is different than that shown on the City approved Final Grading Plan for Kechter Crossing. This is because the location of Lot 4 Block 4 has been revised as part of the Kechter Crossing Planning Land Division Filing Two replat. However, the general stormwater drainage for the revised location of Lot 4, Block 4 is consistent with the City approved Final Grading Plan as demonstrated in the attached Certification of Lot Grading for Lots 4 and 5, Block 4, Kechter Crossing Planning Land Division Filing Two. It is noted that a drainage swale is required to be constructed in Common Area B, Kechter Crossing Planning Land Division Filing Two, adjacent to the rear lot line of Lots 4 and 5, Block 4 in order to adequately convey runoff from Lot 4, Block 4 to the Type C inlet, located in the sump of Common Area B at Design Point 4-B, and in order for the general stormwater drainage to be consistent with the City approved Final Grading Plan. We understand that this work, as well as a few other drainage swales in Common Area B are being designed and are intended to be constructed in the near future. Sincerely, CI\ Ste Principal 10056 Brisbane Lane - Littleton -CO .80130 tel 720-240-5682 -fax 720-223-6092 I i r--2.5 UE _ .. — I B4-1-7 Ira I Tc-4945.50 15'UE I S 15UE r, C EXISTING HOUSE134-1-3 \ o lZa B4-1-2 ^ l 35,863 SF --- EX. TF. 4943.81 `? - 5UE4944 I u n m + B4 L4 m z A 45- PAL1�4G CIS i 5UE V f Ilk 84-1-5 Vt. A A* \ ~ 5UE �!�! 157UE II I I I R4 1` B5-L1 f/ �q — — A / I' ~ P4 1�94b 1�0 B AL3 I B5-L2 R�494SDp 7F-4945.10 PAD.4944.3 PAD-4943.D • �. /� � � i .,Y i�w• �p42 --------- --- - gum M m 130.00 I i y� f` 7i —to-Fz D Z I r4 03 rza oe i. i' L � O Z �. s rx�os'w T m/� `JOYi6`tlD evaEV Nowwo� �ED 00 \s / N \ i Do �a k1 p o z a s S pZ .as 3 K DENWOM DWW 15 >.4mo SYeD.W. CROSSING NM DMS� iR1NG WIO Rwwi tix {G i1 i DECHMR R/JW&E DESIGN COMNDN BD �r.wa m.m.. Iry 9 H N n'Pei "'i�0x �ciue � NOi�' �Surve�ing Inc. ^"-1�1 � r.. 1� nsam a ewe mmr...r"" ATION AND DRAINAGE CERTIFICA 6841 SOUTH YOSEAITTE STREET /100 CENTENNUL, CO 80112 COMMON AREA B e� 1p vRo f 18 R44D I43. k u'z f g 91am SQFT .4.5 N44.6 .4.6 44.5R E Bf Bf 4t 6N fS titl .6 4S �.. 4 4 .0 4 } 45.51 }J 45.9 k OUTLINE OF EXSTING HOUSE RYJti `1' P 2014 1K a 1= .9 WGO N 2 (DRAINAGE CERTIFICATION PASSED ON 04-10-20141 .sa— I TOF�4446.40 5 5 4R 45.1 b IFi 5.6 w m ID Nf n is. I o 4 a COVERED PORCH ., H =4t14.As 9 R 1K .4 CONC. DRIVE � 44. IK f! •�G- >< A 44.4N N44.} 15' U.E Cl 1: 5.6' TP!{YIAWN COP 1 ERVEIN STREET 53'R.O.W. i OF CURB AI. wv Y PROIF O it SR � A '_fie •.. 0 20 40 SCALE: 1'-20' PREPARED FOR: MERRAGE HOMES LOT 4, BLOCK 4, KECHTER CROSSING PLANNED LAND DIVISION. COUNTY OF LARIMER, STATE OF COLORADO; ALSO KNOWN AS:5626 COOPERVEIN STREET, ELEVATION AND DRAINAGE CERTIFICATE I HEREBY CERTIFY THAT THE ELEVATION AND DRAINAGE PATTERNS SHOWN HEREON WERE DEVELOPED FROM AN ELEVATION SURVEY OF THE PROPERTY DESCRIBED HEREON, PERFORMED ON THE DATE SHOWN, AND TO THE BEST OF MY KNOWLEDGE AND BELIEF. ACCURATELY DEPICT THE RELATIVE ELEVATIONS AS THEY EXISTED ON THE DATE OF THE SURVEY. THE RELATIVE ELEVATIONS WERE MEASURED TO THE NEAREST 0.1 FEET. THERE IS SURFACE DRAINAGE AWAY FROM THE FOUNDATION AND THE ELEVATION AND DRAINAGE PATTERNS MEET THE REQUIREMENTS AS SHOWN ON THE PLOT PLAN, DATED 04-14-14 . THE ELEVATIONS DEPICTED HEREON MAY CHANGE SUBSEQUENT TO THE DATE HEREON DUE TO SUBSIDENCE OR UPHEAVAL OF SOILS, ADDITION OR REMOVAL OF SOILS, EROSION OF SOILS BY WIND OR WATER OR OTHER FACTORS. DRAINAGE DRAINAGE SWALES OR FLOW MAY BE BLOCKED BY FENCES, WALKS, LANDSCAPING OR OTHER IMPROVEMENTS, THEREFORE THIS SURVEY MAY NOT ACCURATELY DEPICT THE ELEVATION AND DRAINAGE PATTERNS SUBSEQUENT TO THE DATE OF THIS SURVEY. INS BOCLWFNI E; Nor AN MPRvt'Y[M VJGTION CERImnTE OR wa 6URm Pur. TN6 ADOW STAt pL6 NOT WNRIMTHS PWVERM1 M BE FIQ FROM MSTWC6 OF STANDING OR 9 g1VNHC WATER A FRON THEFOVNC1T CIVAs ensineerintg May 7, 2014 FORT COLLINS UTILITIES 700 Wood Street Fort Collins, Colorado 80521 Re: Lots 4 and 5, Block 4, Kechter Crossing Planning Land Division Filing Two Certification of Lot Grading Kechter Crossing Planning Land Division Filing Two is a replat of Lots 4 and 5, Block 4 and Common Area B of Kechter Crossing Planned Land Division. The purpose of the replat is to relocate Lots 4 and 5, Block 4 so that they front Coppervein Street instead of of Kadenwood Drive and to move the majority of Common Area B so that it fronts Kadenwood Drive instead of Coppervein Street. It is our understanding that no revised Grading or Drainage Plan was required for the replat and therefore the intent of this letter report is to affirm that the general stormwater drainage, as a result of the grading and drainage revisions for the replat is still consistent with the City approved Final Grading. Lots 4 and 5, Block 4 were originally Type A draining lots and were part of Basin A-5, Basin C-1 and Basin C-13, as shown on the Drainage Plan Map for Kechter Crossing. As a result of the replat, Lots 4 and 5, Block 4 are now Type B draining lots and are part of Basin C-6, Basin C-10 and a very small portion of Basin A-4. The characteristics and sizes of the basins were re- evaluated, the 2-year and 100-year runoff values were re -calculated and the design point summary runoff table was revised, based upon the changes to Basins C-1, C-13, C-6 and C-10. The impacts to Basin A-5 and Basin A-1 were considered very insignificant and were not part of the re-evaluation. The results of our analysis are summarized below and the supporting calculations and exhibits are attached to this letter report. It should be noted that the original drainage design was based upon the SWMM Method of hydrology and that our analysis was based upon the Rational Method of hydrology, due to the size of the basins being re-evaluated. The values of the Original Design shown in the summary below are based upon the Rational Method and vary slightly from the values based upon the SWMM Method stated in the Final Stormwater Management Plan for Kechter Crossing. Original Design Replat Basin C-6 Area 0.12 ac. 0.17 ac. Imperviousness 86 % 71 % 2-year runoff 0.4 cfs 0.5 cfs 100-year runoff 1.0 cfs 1.2 cfs Basin C-10 Area 0.86 ac. 0.81 ac. Imperviousness 2 % 16 2-year runoff 0.2 cfs 0.5 cfs 100-year runoff 4.4 cfs 4.3 cfs 10056 Brisbane Lane - Littietcn -CO .80130 tel 720-240-5882 -fax 720-223.6092 Original Design Replat Basin C-1 Area 0.25 ac. 0.25 ac. Imperviousness 61 % 44 % 2-year runoff 0.6 cfs 0.4 cfs 100-year runoff 1.7 cfs 1.6 cfs Basin C-13 Area 0.31 ac. 0.31 ac. Imperviousness 16 % 2 % 2-year runoff 0.2 cfs 1.7 cfs 100-year runoff 0.1 cfs 1.6 cfs Design Point 4-A (Gutter Flow at the intersection of Coppervein Street and Kadenwood Drive) 2-year peak runoff 2.0 cfs 100-year peak runoff 17.2 cfs Design Point 4-B (Type C Inlet in Common Area B) 2-year peak runoff 0.2 cfs 100-year peak runoff 4.4 cfs Design Point 4-C (10' Curb Inlet in Kadenwood Drive) 2-year peak runoff 3.0 cfs 100-year peak runoff 2.7 cfs 2.1 cfs 17.3 cfs 0.5 cfs 4.3 cfs 24.6 cfs 24.4 cfs Based upon our analysis, the grading and drainage revisions as a result of the replat, will not have any significant impact on the storm sewer system for Kechter Crossing. Therefore, it is our professional opinion that these revisions are not significant and will still allow for general stormwater drainage to be consistent with the City approved Final Grading Plan. Sincerely, CIVAS Steven Principal ^ � � �� { } �� } r u \\ \\ \! a m -- Ira ` - m\:� .� - \ 111 1, 1 1; It I \\(; re A I t 0 a I m f M.0 it P M m > 00 Z 0 -0 —10 ;u 0 z > z G) 0 dE lit, z > Z C) z z Z 00 ZA z G)q ��\\� j! VA 2z M�z ix, "N no ,I \}�\ Ono C > 0 Off tit oy< ilk z k0 0 Z 00 G) m 0 > z 0 {! 0 0 f . wo KIECHTER CROSSIFNIG P�114114G 1�10 DIVISION! L'"a TWO NORTHEa ,I]U CITY OF FORT COLLINS ENGINEER 1 7 � . - 0 = a L i -' rn 0 x � rn �I 0 N A ,\rI•I'tRYE7\cEREtT COPPMEIN STREET 1 A ROW \.TeN15\R\Mi4KU '— - 139a15 \u \nl.tn, '... .... ..,..<. S ' .tea.. mk lYt � i iC7i93- 1-f; 5 •Q 1 _ + .fit j `�'y%r'v �- i ` i .; •, '' It ,,•• y �, a ", ', ==r h' t- -. 03 sr 19 t. /mom m X y N Boa 30 ADz miz � cn C o<a x<z a 0 co z r z Lti , E �. 7anENwmouwt� -- E J.EC,fl CW)nl G P SS .G 111) DVS,O nu+: YC un u.. s.� -.x •. s... i i :' 9I 'OPoGGMrr,C Su9\£r CO Wr Y 9 - RXr s � '�-'P.f3:6"o.n"'r'$ •°"� \TfNI1fVBy1119. IIfC. '•• ,xr, n;-m. e YY _L� n� •,��..s_ No Text ®wr�a��a>ra I ; NV J10Y OO NOK a dV W NVId 39VNIVtlO 3LS 0340I3A30 9NISSOHO M31N33X / },fp I / 1 /I Q - — - - - - - - - - •9 s a I - — - - - - - - - - •9 s a I DRAINAGE CRITERIA MANUAL (V. 1) Table RO-5- Runoff Coefficients, (' RUNOFF Percentage Imperviousness Type C and D NRCS Hydrologic Soil Groups 2- r 5- r 10- r 25- r 50- r 100- r 0% 0.04 0.15 0.25 0.37 0.44 0.50 5% 0.08 0.18 0.28 0.39 0.46 0.52 10% 0.11 0.21 0.30 0.41 0.47 0.53 15% 0.14 0.24 0.32 0.43 0.49 0.54 20% 0.17 0.26 0.34 0.44 0.50 0.55 25% 0.20 0.28 0.36 0.46 0.51 0.56 30% 0.22 030 0.38 0.47 0.52 0.57 35% 0.25 0.33 0.40 0.48 0.53 0.57 40% 0.28 0.35 0.42 0.50 0.54 0.58 45% 0.31 0.37 0.44 0.51 0.55 0.59 50% 0.34 0.40 0.46 0.53 0.57 0.60 55% 0.37 0.43 0.48 0.55 0.58 0.62 60% 041 0,46 0.51 0.57 0.60 0.63 65% 045 0.49 0.54 0.59 0.62 0.65 70% 049 053 0.57 0.62 0.65 0.68 75% 054 0.58 0.62 0.66 0.68 0.71 80% 0.60 0.63 0.66 0.70 0.72 0.74 85% 0.66 0.68 0.71 0.75 0.77 0.79 90% 0.73 0.75 0.77 0.80 0.82 0.83 95% 0.80 0.82 0.84 0.87 0.88 0.89 100% 0.89 0.90 0.92 0.94 0.95 0.96 TYPE B NRCS HYDROLOGIC SOILS GROUP 0% 0.02 0.08 0.15 0.25 0.30 0.35 5% 0.04 0.10 0.19 0.28 0.33 0.38 10% 0.06 0.14 0.22 0.31 0.36 0.40 15% 0.08 0.17 0.25 0.33 0.38 0.42 20% 0.12 0.20 0.27 0.35 0.40 0.44 25% 0.15 0.22 0.30 0.37 0.41 046 30% 018 025 0.32 0.39 0.43 0.47 35% 0.20 0.27 0.34 0.41 0.44 0.48 40% 0.23 0.30 0.36 0.42 0.46 0.50 45% 0.26 0.32 0.38 0.44 048 0.51 50% 0.29 0.35 0A0 0.46 0.49 0.52 55% 0.33 0.38 0.43 0.48 0.51 0.54 60% 0.37 0.41 0.46 0.51 0.54 0.56 65% 041 0.45 0.49 0.54 0.57 0.59 70% 0.45 0.49 0.53 0.58 0.60 0.62 75% 0.51 0.54 0.58 0.62 0.64 0.66 80% 0.57 0.59 0.63 0.66 0-68 0.70 85% 0.63 0.66 0.69 0.72 0,73 0.75 90% 0.71 0.73 0.75 0.78 0.80 0.81 95% 0.79 0.81 0.83 0.85 0.87 0.88 100% 0.89 0.90 0.92 0.94 0.95 0.96 2007-01 RO-11 Urban Drainage and Flood Control District COMPOSITE 'C' and % IMPERVIOUS CALCULATIONS Project Name: Kechter Crossing Project No. 13-203 Calculated By: SMS Checked By: Date: 5/7/2014 Basin C-1 0.25 acres Land Use JImp. I C2 I C5 ICiool Area I%Imp.1 % C2 I % C5 I % C 100 Right -of -Way 86 0.67 0.69 050 0.13 43 034 0.35 0.40 Residential 36 0.25 0.33 0.57 0.13 18 1 0.13 0.17 029 Open Space 2 0 05 0 16 051 0.00 1 D 1 0.00 1 000 000 TOTAL 0.25 1 61 1 0.46 1 0.51 0.69 Ravin C-1A 029 acres Land Use Imp C2 C5 C 100 Area I % Imp. % C2 % C5 % C 100 Right -of -Way 86 0.67 0.69 0 80 0.13 43 0.34 0.35 0.40 Residential 36 0.25 0.33 0.57 0.00 0 0.00 0.00 0.00 Open Space 2 0.05 015 051 013 1 0.03 0.08 0.26 TOTAL 0.25 44 0.36 0.43 0.65 Ravin C-6 0.12 acres Land Use Imp.1 C2 I C5 JC10CJ Area I%Imp. I % C2 I % C5 I % C 100 Ri ht-of-Wa 86 1167 0.65 0.80 0.12 B6 0.67 069 0.80 Residential 36 0.25 0.33 0.57 0.00 0 0.00 0.00 000 Open Space 2 1 0.05 0.16 0.51 0.00 0 0.00 0.00 0.00 TOTAL 0.12 86 0.67 0.69 0.30 Basin C-6A 0.17 acres Land Use imp. C2 I CS IC1001 Area % lm % C2 I % C5 I % C 100 Right -of -Way 86 0.67 069 080 0.12 61 0.47 0.49 0.56 Residential 36 0.25 0.33 1 0.57 0.05 11 0.07 0.10 0.17 Open Space 2 0.05 0.16 1 0.51 0 00 0 0.00 1 0.00 000 TOTAL 0.17 71 0.55 1 0.58 0.73 Rasin C-10 0.86 acres Land Use Imp. C2 C5 I C 100 Area % Imp. % C2 % C5 % C 100 Right -of -Way 86 0.67 0.69 0.80 0.00 0 0.00 0.00 0.00 Residential 36 0.25 0,33 057 0.00 0 0.00 no 0.00 Open Space 2 0.05 016 051 085 2 0.05 0.16 0.51 TOTAL 0.55 2 0.05 0.16 0.51 Basin C-10A 0.81 acres Land Use Imp. C2 C5 I C 100 1 Area % Imp. % C2 % C5 I % C 100 Right -of -Way 86 0.67 0.69 0.80 0.00 0 0.00 0.00 0.00 Residential 36 0.25 0.33 0.57 0.34 15 0.10 014 024 Open Space 2 005 0.16 0.51 0.47 1 1 0.03 009 0.30 TOTAL 0.81 1 16 0.13 0.23 0.54 Page 1 Basin C-13 0.31 acres Land Use jImp. I C2 I C5 IC1001 Area I%Imp.1 % C2 I % C5 I % C 100 Right -of -Way 86 0.67 0.69 0.80 0.00 0 0.00 0.00 0.00 Residential 36 1 0.25 0.33 0.57 1 0.15 17 0.12 0.16 0.28 Open Space 2 1 0.05 0.16 0.51 1 0.16 1 1 0.03 1 0.05 0.26 TOTAL 1 0.31 1 18 0.15 1 0.24 0.64 Basin C-13A 0.31 acres Land Use Imp. C2 C5 C too Area % Imp. % C2 % C5 % C too Right -of -Way 86 0.67 0-69 0.80 0.00 0 0.00 0.00 0.00 Residential 36 0.25 033 0.57 0.00 0 O.Oo 0.00 0.00 Open Space 2 0.05 0 16 0.51 0.31 2 0.05 0.15 0.51 TOTAL 0.31 2 0.05 0.16 0.51 Page 2 U u w O IX 2 Z ~ N ~U W Z w p 0ao a Z ( M W tr N 2 o W U } a O N O W 13 0 7 Q Z o a Q oQ 0 �< o -- ■ �IIIII� M LL N d' O LL 0 Qom' Z H V) U) II�:��IIIC� lovIll— flisaae i� Design Point Summary - (modified based upon Rational Method) Design Point Contributing BasinsDesign Basin Area Q 2-year Q t -year (ID) 8 Feature Point (Acres) (CFS) (CFS) 4-A Design Point 3-E 066 0.0 9.5 C-5 0.66 0.5 44 C-6 0.12 01 1.2 C-7 0.37 0.6 3.5 C-11 1.45 0.9 9.1 C-12 045 0.6 42 SUM 3.71 3.0 31.9 Estimated Peak 2.1 17.3 4-B C-10 0.86 05 4.3 STM-2 SURFACE FLOW SUM 0.86 0.5 4 Estimated Peak 0.5 4.3 4-C Design Point 4-A 3.71 2.0 17 3 (STM4-4) Design Point 4-B 0.86 00 4.3 SURFACE FLOW C-1 0.25 04 1 6 C-3 070 0.5 - C-13 0.31 0.1 1 6 SUM 5.83 31 299 Estimated Peak 2.7 24A Page '. Design Point Summary - Original (modified based upon Rational Method) Design Point Contnbuting BasinsDesign Basin Area U 2-year 0 1 -year (10) & Feature Point (Acres) (CFS) (CFS) 4-A Design Point 3-E 066 0.0 9.5 C-5 066 05 44 C-6 012 04 1.0 C-7 037 06 35 C-11 1.45 09 9 1 C-12 0.45 0.6 42 sum 3.71 2.9 31 7 Estimated Peak 2.0 17.2 4.8 C-10 0.86 0.2 4.4 STM-2 SURFACE FLOW SUM 0.86 0.2 4.4 Estimated Peak 0.2 4.4 4-C Design Point 4-A 3.71 20 172 (STM4-4) Design Point 4-B 0.86 0.0 4.4 SURFACE FLOW C-1 0.25 0.6 1.7 C-3 0.70 0.5 51 C-13 0.31 0.2 1.7 SUM 5.83 3.4 301 Estimated Peak 3.0 24 5 Pape 1 Foit oNc.y Design Point Summary - Original (based upon SWMM Method) Design Point Contributing Basins esign Basin Area 0 2-year 0 100-year (to) & Feature Point (Acres) (CFS) (CFS) 4-A Design Point 3-E 0.66 00 95 C-5 0.66 0.5 4.4 C-6 0.12 0.3 1.2 C-7 0.37 0.6 35 C-11 145 0.9 91 C-12 0.45 0.6 42 SUM 371 2.8 31.9 Estimated Peak 2.0 17.3 4-8 C-10 086 00 46 STM-2 SURFACE FLOW sum 0.86 00 46 Estimated Peak 0.0 4.6 4-C Design Point 4-A 371 20 17 3 (STM4-4) Design Point 4-8 085 00 46 SURFACE FLOW C-1 025 03 24 C-3 0 7C 0.5 5 1 C-13 031 0.0 23 sum 5.83 29 31 7 Estimated Peak 2.6 25.9 Page i Design assumptions are outlined as follows: Estimates for Impervious areas are based on measured areas from the provided site development plan and other listed assumptions: Area Right -of -Way Open -space Residential Impervious Surfacing: % of Total % Impervious 22% 86% 31% 2% 47% 36% Assumptions related to impervious surfacing for a typical residential lot are as follows: Residential Lots 8,500 sf (average lot size) Home (w/garage) 2,475 sf Driveway 550 sf Total Impervious 3,025 sf (36% impervious) Attached Impervious Area 1,000 sf (33%) Detached Impervious Area 2,230 sf (67%) Assumptions related to Impervious surfacing for road right-of-ways are as follows: Right-of-way 53 ft width % Impervious 86% - 3,295 sf / 3,816 sf (includes driveway, sidewalk and roadway for a typical 72' frontage). Detached Impervious surfacing is limited to 100% of total impervious surfacing. Based on the proceeding information, the full build out site plan Is estimated to be 36.4% impervious (0.22 x 86) + (0.31 x 2) + (0.47 x 36)). SWMM Imput parameters used 37.2% impervious area across the development. See spreadsheet calculations for SWMM basin input in appendix B. ' C.2 Developed Flow Rates For analysis of the developed site areas, the overlot grading plan is subdivided into local sub - basins. These sub -basins represent relatively planar SWMM subcatchments tributary to either a full street section, 1/2 gutter section, storm sewer Inlet locations, or detention ponds as Final Stormwater Management Plan - Kechter Crossing Subdivision Project No. 0727.07 c Larimer County, CO Page 13 of 26 Ifhi. unofficial copy tcu> downloaded on Stay-0 2013 from the Ciq of Fort Collins Public Records W cbsite: hup.'cit-vdoo.fcpoc.com k it additional information or an official ttrov. oleasc contact C-hv of Fort Collins Utilities 700 Wood Strect Fort Collins. CO 805N USA Project: Kuchler Crossing TABLE 2. DEVELOPED BASIN RUNOFF SUMMARY Notes: Scorano 2 2-Year Event 100-Year Event Basin ID ID Area acres Avenge Slope Equivalent Width fl Impervious Ame Total Precipitation inch" Total Infiltration inches Total Runoff inches Peak Runoff C% Total Precipitation Indw Infiltration Inches Total Runoff inches Peak Runoff cb Element ID BASIN-901-1 2.09 1,5200 274.19 8.00 0,98 0.8900 0,06 0.52 3.67 1M60 1 1 77 4.81 BASIN-901.1 BASIN-901.2 21.22 1.0900 1015.D0 10.00 0.98 0.8810 0.09 4.86 3.67 2.1210 1 138 20.74 BASIW901-2 BASIN-9013 8.30 1.0000 455.D0 2.00 0.98 0.9590 0.02 0.5 3.57 24700 1,12 6.49 BASIN-9013 BASIN-9014 10.55 1.OD00 450.00 1.00 0.93 0.9590 0.02 0.6 3.67 2.3080 1.17 7.80 BASIN-901.4 BASIN-901.6 58.50 1.0000 1756.00 1.00 0.98 0,9590 0.03 3.2 3.67 2.3080 0.99 32.26 BASIN-901.6 BASIN-901.6 14.61 1.OD00 107753 10.00 0.98 0.9660 0,D4 3.7 3.87 1.5310 0.61 24.06 BASIN401A BASIN-A-1 0.25 1.5000 205.00 14.00 0.98 0.9270 0.04 0.0 3.67 1.6220 2.03 1.29 BASIN-A.1 BASIN-A-2 1.51 7.OD00 99824 19.00 0.98 0.9110 0.05 0.2 3.67 1.4960 2.16 10.82 BASIN-A-2 BASIN-A-3 1.14 3,5000 527.40 74.00 0.98 0.4200 0.49 1.4 3.67 0.5040 3,10 10.57 BASIN.A-3 BASIN-A4 1.03 3.5000 531.60 49.00 0.98 0.6490 0.28 0.9 3.67 0.9600 2.66 8.20 BASIN.A4 BASIN-A-5 0.77 3.5000 291.64 34.00 0.95 0.7470 0.20 0.5 3.67 1.2580 2.38 4.63 BASIN-A-6 BASIN-A.6 0.63 3.5000 462.64 60.00 0.98 0.5580 0.36 0.7 3.67 0.7440 2.87 5.T7 BASt".6 BASIN-A-7 0.15 2.0000 16643 78.00 0.98 0.3340 0.57 0.3 3.67 OA100 3.18 1 1All BASIN-A-7 BASINS-1 5.24 3.5000 1561,51 10.00 0.98 0.9240 0.04 0.8 3.67 1.8120 1.55 16.58 BASIN-B-1 BASIN-6-2 1.88 4.5000 345.D0 13.00 0.98 0.9080 0.06 0.3 3.117 1.7510 1.91 5.32 BASIN-B4 BASIN-83 0.50 3.5000 375.13 79.00 0.98 0.3340 0.57 0.9 3.67 0.3960 3.19 4,87 BASi"3 BASIN48.4 0.26 2.0000 318.14 86.00 0,98 0.2000 0,69 1 0.6 3.67 02560 3.33 2.57 BASIN-34 BASIN43-5 0.10 2.0000 157.14 86.D0 0.98 0.1990 0.69 0.2 3.67 0.2550 3.33 0.99 BASIN-8-5 BASIN-e-6 0.49 3.5000 363.12 72.00 0.98 1 0.4210 0.48 0.7 3.67 0.5250 3.07 4.70 BASIN-B-6 BASIN-B-7 1.40 3.5000 653.81 56.00 0.95 0.6290 0.29 1.3 3.67 0.9380 2.78 11.60 13ASIN-8.7 SASIN-13-8 0.35 20D00 44528 86.00 0.98 0.2D00 0.69 0.8 3.67 0.2560 3.33 3.47 BASIM434 BASINS 0.89 3.5000 474 58 59.00 0.98 0.5620 0.35 0.8 3.67 0.7540 2.85 6.2a BASIN-8-9 BASING-1 0.25 3.5000 250.91 61.00 0.98 0.5580 0.38 0.3 3.67 0.7220 2.89 2.40 1 BASIN-C-1 BASING-2 D.90 2.0000 156.47 86.00 0.98 0.1990 0.69 02 1 3.67 0.2540 3.33 0.99 1 BASIN-C-2 BASM44 D.70 2.0000 430.29 43.00 0.98 0.6970 0.24 0.5 3.67 1.0780 2.55 5.08 BASINC3 BASING 0.31 2.DOOD 349.56 68.00 0.98 0,4030 0.51 0.5 3.87 0.5850 3.02 2.96 BASING-4 BASIN-C-5 0.66 3.5DOD 194.13 48.00 0.98 0.6600 0.27 0.5 3.67 1.0080 2.81 4,35 BASINC3 BASINC-6 0.12 2.0000 124.73 86.00 0.98 0.2060 0.69 0.3 3.67 0.2580 3.33 1.2 1 BASING BASING-7 0.37 2.5000 205.90 75.00 0,98 0.3050 0.54 0.6 3.67 0.47DO 3.12 3.5 1 BASINC-7 BASING-8 0.43 ZOOM 199.35 20.00 0.98 0.9050 0.05 0.1 3.67 1.5490 2.10 1.9 BASINC-8 BASING-9 0.26 1.OD00 375,00 8.00 0.98 1 0.9530 0.02 0.0 3.67 1.7040 1.96 1.5 BASINC-9 BASING-10 0,86 4.0000 375.00 2.00 0.98 0.9750 0.00 0.0 3.67 1.8080 1.16 4.6 BASINC-10 BASING-11 1.45 3.5D00 435.00 44.00 0.98 0.7370 0.20 0.9 3.67 1.D930 2.53 9.1 BASING-11 BASING-12 0.45 2.OD00 325.00 70.00 0.98 0.4550 0.45 0.6 3.67 0.5690 3.03 4.2 1 BASINC-12 BASING-13 0.31 4.0000 296.52 18.00 0,98 0.9160 0.04 O.D 3.67 1.5090 2.14 23 1 BASINC-13 BASIN4D-1 0.42 2.0000 550.00 78.00 0.98 0.3210 0.58 0.8 3.67 1 0.4370 3.16 42 1 BASIN-D-1 BASIN-D-2 1.28 2.5DOO 572.37 49.00 0.98 0.6080 0.24 1.0 1 3.67 D.9800 2.64 9.3 BASIN-13-2 BASIN-0-3 1.43 2.0D00 %0.50 18.00 0.98 0.9230 0.D4 0.2 3.67 1.8460 2.01 5.3 BASIN-0-3 BASIN-3-4 0.44 3.5000N22 5 65.00 0.98 0.5040 0.41 0.6 3.67 0.6520 2.95 4.1 BASIN-D-4 BASIN -OS 2.39 3.5DDO5 43.00 0.95 0.7730 0.16 12 3.67 1.1160 2.51 14.8 BASIN-" BAStN-E.1 0.17 2.00000 80.00 0.93 0.1990 0.69 04 3.87 0.2550 3.33 1.7 BASINE-1 BASIN-E-2 0.75 5.00004 16.00 0.98 0.5820 0.00 00 3.67 1,5790 2.08 4.4 BASINE-2 BASIN-E3 0.09 SADDO8 ZOO 0.98 0.9740 O.DO 0.0 3.67 1.7490 1.92 0.5 BASIN.E3 BASINE-4 O.09 5.OD002 2.00 0.93 0.9730 O.DO 0.0 3.67 1.7420 1.93 0.5 BASINE4 BASIN-K-1 0.52 2.00002 25.00 0.98 0.7340 0.22 0.4 3.67 1.3130 2.33 4.3 BASIN-K-1 BASIN-K4 0.47 200001 33.00 0.98 0.6550 0.29 0.4 3.67 1,2070 2.43 3.9 BASIN-K4 BASIN -KS 027 2.00002 33.00 0.98 0.6550 0.29 0.3 3.67 12190 2.42 2.1 BASIN-K-5 BASIN -KS 0.20 2.00006 25.00 0.98 0.7340 0.22 0.1 3.67 1.3430 2.31 1.7 BASIN-K4i BASIN-K-9 0.35 3.50006 35.00 0.98 0.6360 0.31 0.4 3.67 1.1740 2.47 2.9 BASIN-K-9 BASIN-K-10 0.14 3.5000 15326 35.00 0.98 0.6360 0.31 0.1 3.57 1.1630 2.48 12 BASIN-K-10 BASIN-K41 0.44 1 3.5000 435.79 35.00 0.98 0.6360 0.31 0 4 1 1 3.67 1.1670 2A7 1 3.8 1 BASIN-K-11 z F F W W W W Z+l Z Z 4 h W Z Z W w Z 7 p h z N d O m m Q O O d w o O d w m m o rn O �- Co d w w V1 LA ob rn Vi F Z N z m Z z t9 O 0 l7 z O _ Q w w wL11 u V w z W 3 3 3 zOf 6 a q W m W lD U LL 1p a m U N W p �'• W W n Z z Q i U ^ cs. 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