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HomeMy WebLinkAbout20081730 Ver 1_More Info Received_20100211Y : Februrary 11, 2010 North Carolina Department of Environment and Natural Resources Division of Water Quality 401 Oversight/Express Review Permitting Unit 1650 Mail Service Center Raleigh, North Carolina 27699-1650 Attention: Ms. Cyndi Karoly, Supervisor 401 Oversight/Express Review Permitting Unit SUBJECT: Responses to Request for More Information Keith Hills West - Tract A Cape Fear River 1030607,18-(16.7), WSIV} Neills Creek Township Metro Water and Sewer District PN: 07-032 Dear Ms. Karoly, cF R AND warFM1.c?ITY :tr We offer the following responses to your "Request for More Information" letter prepared by your office dated November 12, 2009, and offer new revised plans and calculations: Comment No. 1: Please provide the following information about the proposed stormwater wetland: Response No. 1: The Stormwater wetland has been eliminated. This BMP has been replaced with a wetpond in a new location. After a second site visit with USACOE, it was determined that the existing wetlands were greater than originally delineated. The BMP had to be relocated and a wetland would not work in this area. Comment No. 2: Wetland Impacts: Please furnish this office with an approved wetland jurisdictional determination by the Corps showing all delineated wetlands on the entire project site. (Needed to verify that there are no wetlands impacts at the proposed wetland location or any other location on the project site). Response No. 2: Have met with the Corps on site and the wetlands for this project area have been correctly delineated on this plan. PAPENNW\O7032\0l£ce\cyndi karoly ncdenr tract a kr 02-11-10.doc GREEN ENGINEERING, PLLC WATER, WASTEWATER SURVEYING, PLANNING, PROJECT MANAGEMENT 303 N. GOLDSBORO ST. PO BOX 609 WILSON N.C. 27893 TEL 252.237.5365 FAX 252.243.7489 WWW.GREENENGINEERING.COM o$-?13co v2? We trust that the foregoing responses will be sufficient for you to complete your review. Should you need additional information, please advise. Respectfully, Sean Hein, PLS SH/pbg P:\PENNW\07032\Office\cyndi karoly ncdenr tract a Itr 02-11-10.doc Permit *4 NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information. (to be provided by DWQ) OaO? ?Ar?RPG ?n a:. i', rY.?y, Tak}'Lts y+? s't };.i,ti? •.r??i? rw Project name With Hills Tract "A" Contact person Sean P. Hein Phone number 252-237-5365 - Date 211112010 Drainage area number 1 Site Characteristics Drainage area 397,528 ft3 Impervious area, post-development 196,000 fe % impervious 49.30% Design rainfall depth 1.0 in Storage Volume: Non-SA Waters Minimum volume required 32,464 ft3 OK Volume provided 39,986 ft3 OK, volume provided is equal to or in excess of volume required. Storage Volume: SA Waters 1.5" runoff volume Pre-development 1-yr, 24-hr runoff Post-development 1-yr, 24-hr runoff Minimum volume required Volume provided Peak Flow Calculations Is the pre/post control of the 1yr 24hr stone peak flow required? 1-yr, 24-hr rainfall depth Rational C, pre-development Rational C, post-development Rainfall intensity: 1-yr, 24-hr storm Pre-development 1-yr, 24-hr peak flow Post-development 1-yr, 24-hr peak flow Pre/Post 1-yr, 24-hr peak flow control Elevations Temporary pool elevation Permanent pool elevation SHWT elevation (approx. at the perm. pool elevation) Top of 1Oft vegetated shelf elevation Bottom of 1 Oft vegetated shelf elevation Sediment cleanout, top elevation (bottom of pond) Sediment cleanout, bottom elevation Sediment storage provided Is there additional volume stored above the state-required temp. pool? Elevation of the top of the additional volume fill ft3 to ft3 fill n (Y or N) 0.6 in 0.20 (unitless) 0.50 (unitless) 2.54 in/hr OK 4.14 ft3/sec 8.27 ft3/sec 4.13 ft3/sec 130.00 hsl 128.00 hsl fmsl 128.50 hsl 127.50 hsl Data not needed for calculation option #1, but OK if provided. 125.00 hsl 124.00 hsl Data not needed for calculation option #1, but OK if provided. 1.00 ft y (Y or N) 130.0 hsl OK Form SW401-Wet Detention Basin-Rev.8-9/17/09 Parts I. & II. Design Summary, Page 1 of 2 Permit No. (to be provided by DWQ) 11. D :. ! A WWATION Surface Areas Area, temporary pool 13,071 fe Area REQUIRED, permanent pool 8,189 if SAIDA ratio 2 06 (unitless) Area PROVIDED, permanent pool, Apm_p o, 8,502 ft` OK Area, bottom of 1Oft vegetated shelf, AWLAeff 5,307 Area, sediment cleanout, top elevation (bottom of pond), Abo,yond 3,351 f? Volumes Volume, temporary pool 39,986 ft3 OK Volume, permanent pool, Vp,,„ -,.l 17,776 ft3 Volume, forebay (sum of forebays if more than one forebay) 3,769 ft3 Forebay % of permanent pool volume 21.2% % OK SAIDA Table Data Design TSS removal 85% Coastal SAIDA Table Used? n (Y or N) Mountain/Piedmont SAIDA Table Used? y (Y or N) SAIDA ratio 2.06 (unitless) Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10-2b) y (Y or N) Volume, permanent pool, Vp,--,-i 17776 ft° Area provided, permanent pool, AP,-_P-1 8,502 ft Average depth calculated 3.00 ft OK Average depth used in SAIDA, d.„ (Round to nearest 0.5ft) 3.0 ft OK Calculation option 2 used? (See Figure 10-2b) n (Y or N) Area provided, permanent pool, Apa.yoo, 8,502 ft` Area, bottom of 1Oft vegetated shelf, Abotehe„ 5,307 fe Area, sediment cleanout, top elevation (bottom of pond), AboLa«,d 3,351 fe "Depth" (distance b/w bottom of 1Oft shelf and top of sediment) 2.50 It Average depth calculated 3.00 ft OK Average depth used in SAIDA, d,,, (Round to nearest 0.5ft) 3.0 ft OK Drawdown Calculations Drawdown through orifice? y (Y or N) Diameter of orifice (if circular) 2,00 in Area of orifice (if-non-circular) in, Coefficient of discharge (CO) 0.60 (unitless) Driving head (Ho) 2,00 ft Drawdown through weir? n (Y or N) Weir type (unitless) Coefficient of discharge (CW) (unitless) Length of weir (L) ft Driving head (H) ft Pre-development 1-yr, 24-hr peak flow 4.14 ft3/sec Post-development 1-yr, 24-hr peak flow 8.27 ft3/sec Storage volume discharge rate (through discharge orifice or weir) 0.09 ft3/sec Storage volume drawdown time 2.06 days Additional Information Vegetated side slopes 3 :1 Vegetated shelf slope 10 :1 Vegetated shelf width 10.0 ft Length of flowpath to width ratio 3 :1 Length to width ratio 2.0 :1 Trash rack for overflow & orifice? y (Y or N) Freeboard provided 1.0 ft Vegetated filter provided? y (Y or N) Recorded drainage easement provided? y (Y or N) Capures all runoff at ultimate build-out? y (Y or N) Drain mechanism for maintenance or emergencies is: Forth SW401-Wet Detention Basin-Rev.8-9/17/09 OK, draws down in 2-5 days. OK OK OK OK OK OK OK OK OK OK Parts I. & II. Design Summary, Page 2 of 2 Permit No. (to be provided by DWQ) Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Page/ Plan Initials Sheet No. 1. Plans (1" - 50' or larger) of the entire site showing: - Design at ultimate build-out, - Off-site drainage (if applicable), - Delineated drainage basins (include Rational C coefficient per basin), - Basin dimensions, - Pretreatment system, - High flow bypass system, - Maintenance access, - Proposed drainage easement and public right of way (ROM, - Overflow device, and I) - Boundaries of drainage easement. 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing: - Outlet structure with trash rack or similar, - Maintenance access, - Permanent pool dimensions, - Forebay and main pond with hardened emergency spillway, - Basin cross-section, - Vegetation specification for planting shelf, and - Filter strip. b ? ' / ?1 " ' { 3. Section view of the wet detention basin (1 = 20 or larger) showing: - Side slopes, 3:1 or lower, - Pretreatment and treatment areas, and - Inlet and outlet structures. 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified on the plans prior to use as a wet detention basin. r 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay, to verify volume provided. 6 . A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. 7 The su ortin l l ti . pp g ca cu a ons. 8. A copy of the signed and notarized operation and maintenance (0&M) agreement. ?r •? 9. A copy of the deed restrictions (if required). S 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County soil maps are not an acceptable source of soils information. Form SW401-Wet Detention Basin-Rev.8-9/17/09 Part III. Required Items Checklist, Page 1 of 1 Keith Hills Tract "A" Wet Pond Calculations February 11, 2010 Design Criteria: 1. Use Schueler's Method for calculating required volume of storage for first 1" of rainfall run-off given site impervious area. 2. Site impervious area = 4.5 acres Site area = 9.126 acres Percent impervious = 49.31 % 3. Design with a minimum 3 foot permanent pool depth and 85% TSS Removal. Results in a SD/SA Ratio of 2.24 Percent Impervious SD/SA 50 2.06 Pond Design: 1. Pond surface area required = ((2.06/100) * 9.126) * 43,560 = 8,190 sf Pond surface area provided at elevation 128.00' = 8,502 sf 2. Minimum storage volume required for treatment of 2 to 5 day drawdown = Rv = 0.05 + 0.009 (I) Rv = Runoff coefficient = 0.05 + 0.009 (49.31) I = Impervious Area (%) = 0.4938 in/in Required Volume = (Design Rainfall) (Rv) (Drainage Area) _ (1") (0.49 in/in) (1 ft/ 12 in) (9.126 ac) = 0.3726 ac - ft = 16,232 cf Surface Area at Permanent Pool = 8,502 sf Need approximately 2.00 feet of storage (Vol/SA) = (16232/8502) Provided storage for 2.0' to elevation 130.00' P:\PENNW\07032.2\Engineering\pond calculations.doc 1 Surface area at top of riser elevation 130.0' = 13,071 sf Volume provided = 39,986 cf (from stage storage chart) 3. Determine total pond volume: Stage Surface Area Storage 124.0 2669 sf 0 cf 125.0 4168 sf 0 cf 126.0 5176 sf 4672 cf 127.0 6265 sf 10392 cf 128.0 8502 sf 17776 cf 129.0 1-1424 sf 27739 cf 130.0 13071 sf 39986 cf 131.0 16007 sf 54525 cf 132.0 17547 sf 71302 cf 4. Determine required volume of forebay. Provided volume in permanent pool = 17776 cf Volume required in forebay = 3555 cf (17776 cf * 0.2) Volume provided in forebay = 3769 cf 5. Determine orifice size for drawdown of 1" runoff Volume of first 1" runoff = 16,232 cf (Sediment Cleanout) (Bottom of Pond) (Permanent Pool) (Top of Riser) (Emergency Spillway) Two day drawdown flow: Q(2) = 16232 cf/1 min/1 hr / two days = 0.0939 cf/sec Five day drawdown flow: Q(5) = 16232 cf/1 min/l hr / five days = 0.0376 cf/sec Try 1" orifice: Q=cd *A* sqrt (2gh) cd = 0.60 Q=(0.60) * (0.0055) * (sgrt(2*32.2*0.75)) Q=0.023 cfs With a 1 "orifice, the 1" runoff will take approximately 8 days to drain. Try 2" Orifice:Q = cd *A* sgrt (2gh) cd = 0.60 Q = (0.60) * (0.0218) * (sgrt(2* 32.2 * 0.75) Q = 0.091 cfs With a 2"orifice, the 1" runoff will take approximately 2 days and 1.5 hours to drain. Try 4" Orifice:Q = cd *A* sqrt (2gh) cd = 0.60 Q = (0.60) * (0.0855) * (sgrt(2* 32.2 * 0.75) Q = 0.3565 cfs PAPENW07032.2\Engineering\pond catculations.doc 2 With a 4"orifice, the 1" runoff will take approximately 12.5 hours to drain. Use 2" orifice See enclosed routing chart for Time and flows. 6. Verify spillway will control larger storms. Drainage area = 9.126 acres Impervious surface area = 4.5 acres Rational coefficient = 0.6 Rainfall Frequency Intensity Q 10 year 7.50 41.1 25 year 8.19 44.8 100 year 9.72 53.2 Provide 5'x5' inside diameter concrete riser with top elevation at 130.00' 36" RCP leaving riser with invert elevation of 125.00' Frequency Flow Above Riser Elevation Culvert Flow Height Elevation 10 year 0.78' 130.78' 1.90' 126.90' 25 year 0.82' 130.82' 2.10' 127.10' 100 year 0.92' 138.92' 2.40' 127.40' Top of pond =132.00' Max height of 100 year storm = 130.92' (1.08' freeboard) Note: 100 year flow calculation did not include detention area in pond which will lower the overall effect of a 100 year storm event. See enclosed routing for time and flows. P:\PENNW\07032.2\Engineering\pond calculations.doc 3 Stage Storage Weir 1 Q Weir 2 Q Discharge (ft) (ac-ft) (cfs) (cfs) (cfs) 125.00 0.00 0.00 0.00 0.00 126.00 0.11 0.00 0.00 0.00 127.00 0.24 0.00 0.00 0.00 128.00 0.41 0.00 0.00 0.00 129.00 0.64 0.10 0.00 0.10 130.00 0.92 0.15 0.00 0.15 131.00 1.25 0.19 66.60 66.79 132.00 1.63 0.22 188.37 188.59 Weir Numberl Type : Circular Orifice Equation : Q = C*A*2g^.5*H^n Weir Invert (ft) : 128.00 C: 0.60 n: 0.50 Orifice Diameter (ft) : 0.17 Weir Number2 Type : Rect. No End Contractions Equation : Q = B*C*H^n Weir Invert (ft) : 130.00 C: 3.33 n: 1.50 Pond Routing 8 6 Flow (cfs) 4 2 0 Pond Flow In Pond Flow Out Time (hours) Hydrograph Type :SCS 484 Hydrograph Time Time Rain C Rain Infiltration Excess Excess Outflow (hr) HHMM (in) (in) (in) (in) (cfs) (cfs) 0.083 00005 0.001 0.001 0.000 0.000 0.036 0.017 0.167 00010 0.001 0.001 0.000 0.000 0.036 0.033 0.250 00015 0.001 0.002 0.000 0.000 0.036 0.039 0.333 00020 0.001 0.003 0.001 0.000 0.054 0.045 0.417 00025 0.001 0.004 0.001 0.000 0.054 0.053 0.500 00030 0.001 0.005 0.001 0.000 0.054 0.056 0.583 00035 0.001 0.006 0.001 0.000 0.054 0.054 0.667 00040 0.001 0.007 0.001 0.000 0.054 0.054 0.750 00045 0.001 0.008 0.001 0.000 0.054 0.054 0.833 00050 0.001 0.009 0.001 0.000 0.054 0.054 0.917 00055 0.001 0.010 0.001 0.000 0.054 0.054 1.000 00100 0.001 0.011 0.001 0.000 0.054 0.054 1.083 00105 0.001 0.012 0.001 0.000 0.054 0.054 1.167 00110 0.001 0.013 0.001 0.000 0.054 0.054 1.250 00115 0.001 0.014 0.001 0.000 0.054 0.054 1.333 00120 0.001 0.015 0.001 0.000 0.054 0.054 1.417 00125 0.001 0.016 0.001 0.000 0.054 0.054 1.500 00130 0.001 0.017 0.001 0.000 0.054 0.054 1.583 00135 0.001 0.018 0.001 0.000 0.054 0.054 1.667 00140 0.001 0.019 0.001 0.000 0.054 0.054 1.750 00145 0.001 0.020 0.001 0.000 0.054 0.054 1.833 00150 0.001 0.021 0.001 0.000 0.054 0.054 1.917 00155 0.001 0.022 0.001 0.000 0.054 0.054 2.000 00200 0.001 0.023 0.001 0.000 0.054 0.054 2.083 00205 0.001 0.024 0.001 0.000 0.054 0.054 2.167 00210 0.001 0.025 0.001 0.000 0.054 0.054 2.250 00215 0.001 0.026 0.001 0.000 0.054 0.054 2.333 00220 0.001 0.027 0.001 0.000 0.054 0.054 2.417 00225 0.001 0.028 0.001 0.000 0.054 0.054 2.500 00230 0.001 0.029 0.001 0.000 0.054 0.054 2.583 00235 0.001 0.030 0.001 0.000 0.054 0.054 2.667 00240 0.001 0.031 0.001 0.000 0.054 0.054 2.750 00245 0.001 0.032 0.001 0.000 0.054 0.054 2.833 00250 0.001 0.033 0.001 0.000 0.054 0.054 2.917 00255 0.001 0.034 0.001 0.000 0.054 0.054 3.000 00300 0.001 0.035 0.001 0.000 0.054 0.054 3.083 00305 0.001 0.036 0.001 0.000 0.054 0.054 3.167 00310 0.001 0.037 0.001 0.000 0.054 0.054 3.250 00315 0.001 0.038 0.001 0.000 0.054 0.054 3.333 00320 0.001 0.039 0.001 0.000 0.054 0.054 3.417 00325 0.001 0.040 0.001 0.000 0.054 0.054 3.500 00330 0.001 0.041 0.001 0.000 0.054 0.054 3.583 00335 0.001 0.042 0.001 0.000 0.054 0.054 3.667 00340 0.001 0.043 0.001 0.000 0.054 0.054 3.750 00345 0.001 0.044 0.001 0.000 0.054 0.054 3.833 00350 0.001 0.045 0.001 0.001 0.073 0.063 3.917 00355 0.001 0.047 0.001 0.001 0.073 0.071 4.000 00400 0.001 0.048 0.001 0.001 0.073 0.074 4.083 00405 0.001 0.049 0.001 0.001 0.073 0.073 4.167 00410 0.001 0.051 0.001 0.001 0.073 0.073 4.250 00415 0.001 0.052 0.001 0.001 0.073 0.073 4.333 00420 0.001 0.053 0.001 0.001 0.073 0.073 4.417 00425 0.001 0.055 0.001 0.001 0.073 0.073 4.500 00430 0.001 0.056 0.001 0.001 0.073 0.073 4.583 00435 0.001 0.057 0.001 0.001 0.073 0.073 4.667 00440 0.001 0.059 0.001 0.001 0.073 0.073 4.750 00445 0.001 0.060 0.001 0.001 0.073 0.073 4.833 00450 0.001 0.061 0.001 0.001 0.073 0.073 4.917 00455 0.001 0.063 0.001 0.001 0.073 0.073 5.000 00500 0.001 0.064 0.001 0.001 0.073 0.073 5.083 00505 0.001 0.065 0.001 0.001 0.073 0.073 5.167 00510 0.001 0.067 0.001 0.001 0.073 0.073 5.250 00515 0.001 0.068 0.001 0.001 0.073 0.073 5.333 00520 0.001 0.069 0.001 0.001 0.073 0.073 5.417 00525 0.001 0.071 0.001 0.001 0.073 0.073 5.500 00530 0.001 0.072 0.001 0.001 0.073 0.073 5.583 00535 0.001 0.073 0.001 0.001 0.073 0.073 5.667 00540 0.001 0.075 0.001 0.001 0.073 0.073 5.750 00545 0.001 0.076 0.001 0.001 0.073 0.073 5.833 00550 0.001 0.077 0.001 0.001 0.073 0.073 5.917 00555 0.001 0.079 0.001 0.001 0.073 0.073 6.000 00600 0.001 0.080 0.001 0.001 0.073 0.073 6.083 00605 0.002 0.082 0.001 0.001 0.091 0.081 6.167 00610 0.002 0.083 0.001 0.001 0.091 0.089 6.250 00615 0.002 0.085 0.001 0.001 0.091 0.092 6.333 00620 0.002 0.087 0.001 0.001 0.091 0.091 6.417 00625 0.002 0.088 0.001 0.001 0.091 0.091 6.500 00630 0.002 0.090 0.001 0.001 0.091 0.091 6.583 00635 0.002 0.092 0.001 0.001 '0.091 0.091 6.667 00640 0.002 0.093 0.001 0.001 0.091 0.091 6.750 00645 0.002 0.095 0.001 0.001 0.091 0.091 6.833 00650 0.002 0.097 0.001 0.001 0.091 0.091 6.917 00655 0.002 0.098 0.001 0.001 0.091 0.091 7.000 00700 0.002 0.100 0.001 0.001 0.091 0.091 7.083 00705 0.002 0.102 0.001 0.001 0.091 0.091 7.167 00710 0.002 0.103 0.001 0.001 0.091 0.091 7.250 00715 0.002 0.105 0.001 0.001 0.091 0.091 7.333 00720 0.002 0.107 0.001 0.001 0.091 0.091 7.417 00725 0.002 0.108 0.001 0.001 0.091 0.091 7.500 00730 0.002 0.110 0.001 0.001 0.091 0.091 7.583 00735 0.002 0.112 0.001 0.001 0.091 0.091 7.667 00740 0.002 0.113 0.001 0.001 0.091 0.091 7.750 00745 0.002 0.115 0.001 0.001 0.091 0.091 7.833 00750 0.002 0.117 0.001 0.001 0.091 0.091 7.917 00755 0.002 0.118 0.001 0.001 0.091 0.091 8.000 00800 0.002 0.120 0.001 0.001 0.091 0.091 8.083 00805 0.002 0.122 0.001 0.001 0.109 0.099 8.167 00810 0.002 0.124 0.001 0.001 0.109 0.107 8.250 00815 0.002 0.126 0.001 0.001 0.109 0.110 8.333 00820 0.002 0.128 0.001 0.001 0.127 0.117 8.417 00825 0.002 0.131 0.001 0.001 0.127 0.125 8.500 00830 0.002 0.133 0.001 0.001 0.127 0.129 8.583 00835 0.002 0.135 0.001 0.001 0.127 0.127 8.667 00840 0.002 0.138 0.001 0.001 0.127 0.127 8.750 00845 0.002 0.140 0.001 0.001 0.127 0.127 8.833 00850 0.002 0.142 0.001 0.001 0.127 0.127 8.917 00855 0.002 0.145 0.001 0.001 0.127 0.127 9.000 00900 0.002 0.147 0.001 0.001 0.127 0.127 9.083 00905 0.003 0.150 0.001 0.001 0.145 0.135 9.167 00910 0.003 0.152 0.001 0.001 0.145 0.143 9.250 00915 0.003 0.155 0.001 0.001 0.145 0.147 9.333 00920 0.003 0.158 0.001 0.001 0.145 0.145 9.417 00925 0.003 0.160 0.001 0.001 0.145 0.145 9.500 00930 0.003 0.163 0.001 0.001 0.145 0.145 9.583 00935 0.003 0.166 0.002 0.001 0.163 0.154 9.667 00940 0.003 0.169 0.002 0.001 0.163 0.162 9.750 00945 0.003 0.172 0.002 0.001 0.163 0.165 9.833 00950 0.003 0.175 0.002 0.001 0.163 0.163 9.917 00955 0.003 0.178 0.002 0.001 0.163 0.163 10.00 01000 0.003 0.181 0.002 0.001 0.163 0.163 10.08 01005 0.003 0.184 0.002 0.002 0.181 0.172 10.16 01010 0.003 0.188 0.002 0.002 0.181 0.180 10.25 01015 0.003 0.191 0.002 0.002 0.181 0.183 10.33 01020 0.004 0.195 0.002 0.002 0.218 0.198 10.41 01025 0.004 0.199 0.002 0.002 0.218 0.214 10.50 01030 0.004 0.203 0.002 0.002 0.218 0.221 10.58 01035 0.005 0.208 0.003 0.002 0.272 0.243 10.66 01040 0.005 0.213 0.003 0.002 0.272 0.267 10.75 01045 0.005 0.218 0.003 0.002 0.272 0.277 10.83 01050 0.006 0.224 0.003 0.003 0.327 0.297 10.91 01055 0.006 0.230 0.003 0.003 0.327 0.322 11.00 01100 0.006 0.236 0.003 0.003 0.327 0.331 11.08 01105 0.007 0.243 0.004 0.003 0.381 0.352 11.16 01110 0.007 0.250 0.004 0.003 0.381 0.376 11.25 01115 0.007 0.257 0.004 0.003 0.381 0.386 11.33 01120 0.009 0.266 0.004 0.004 0.472 0.423 11.41 01125 0.009 0.274 0.004 0.004 0.472 0.463 11.50 01130 0.009 0.283 0.004 0.004 0.472 0.480 11.58 01135 0.035 0.318 0.018 0.017 1.887 1.127 11.66 01140 0.035 0.352 0.018 0.017 1.887 1.756 11.75 01145 0.035 0.387 0.017 0.017 1.923 2.026 11.83 01150 0.092 0.479 0.043 0.049 5.442 3.548 11.91 01155 0.092 0.571 0.039 0.053 5.879 5.322 12.00 01200 0.092 0.663 0.035 0.057 6.259 6.319 12.08 01205 0.015 0.678 0.005 0.009 1.029 3.842 12.16 01210 0.015 0.692 0.005 0.009 1.038 1.550 12.25 01215 0.015 0.707 0.005 0.009 1.046 0.588 12.33 01220 0.009 0.716 0.003 0.006 0.670 0.872 12.41 01225 0.009 0.726 0.003 0.006 0.673 0.707 12.50 01230 0.009 0.735 0.003 0.006 0.676 0.641 12.58 01235 0.008 0.743 0.003 0.005 0.557 0.621 12.66 01240 0.008 0.750 0.003 0.005 0.559 0.570 12.75 01245 0.008 0.758 0.003 0.005 0.562 0.550 12.83 01250 0.006 0.764 0.002 0.004 0.441 0.506 12.91 01255 0.006 0.770 0.002 0.004 0.442 0.453 13.00 01300 0.006 0.776 0.002 0.004 0.443 0.432 13.08 01305 0.005 0.781 0.002 0.003 0.370 0.410 13.16 01310 0.005 0.786 0.002 0.003 0.371 0.378 13.25 01315 0.005 0.791 0.002 0.003 0.372 0.365 13.33 01320 0.004 0.795 0.001 0.003 0.323 0.349 13.41 01325 0.004 0.800 0.001 0.003 0.324 0.328 13.50 01330 0.004 0.804 0.001 0.003 0.324 0.320 13.58 01335 0.004 0.808 0.001 0.002 0.275 0.301 13.66 01340 0.004 0.811 0.001 0.002 0.275 0.280 13.75 01345 0.004 0.815 0.001 0.002 0.276 0.271 13.83 01350 0.003 0.818 0.001 0.002 0.251 0.264 13.91 01355 0.003 0.822 0.001 0.002 0.251 0.253 14.00 01400 0.003 0.825 0.001 0.002 0.252 0.249 14.08 01405 0.003 0.828 0.001 0.002 0.227 0.240 14.16 01410 0.003 0.831 0.001 0.002 0.227 0.229 14.25 01415 0.003 0.834 0.001 0.002 0.227 0.225 14.33 01420 0.003 0.837 0.001 0.002 0.202 0.216 14.41 01425 0.003 0.839 0.001 0.002 0.203 0.205 14.50 01430 0.003 0.842 0.001 0.002 0.203 0.200 14.58 01435 0.002 0.844 0.001 0.002 0.178 0.191 14.66 01440 0.002 0.847 0.001 0.002 0.178 0.180 14.75 01445 0.002 0.849 0.001 0.002 0.178 0.176 14.83 01450 0.002 0.851 0.001 0.002 0.178 0.178 14.91 01455 0.002 0.854 0.001 0.002 0.178 0.178 15.00 01500 0.002 0.856 0.001 0.002 0.178 0.178 15.08 01505 0.002 0.858 0.001 0.002 0.179 0.179 15.16 01510 0.002 0.861 0.001 0.002 0.179 0.179 15.25 01515 0.002 0.863 0.001 0.002 0.179 0.179 15.33 01520 0.002 0.865 0.001 0.001 0.153 0.167 15.41 01525 0.002 0.867 0.001 0.001 0.154 0.156 15.50 01530 0.002 0.869 0.001 0.001 0.154 0.151 15.58 01535 0.002 0.871 0.001 0.001 0.154 0.154 15.66 01540 0.002 0.873 0.001 0.001 0.154 0.154 15.75 01545 0.002 0.875 0.001 0.001 0.154 0.154 15.83 01550 0.002 0.877 0.001 0.001 0.154 0.154 15.91 01555 0.002 0.879 0.001 0.001 0.154 0.154 16.00 01600 0.002 0.881 0.001 0.001 0.154 0.154 16.08 01605 0.002 0.883 0.001 0.001 0.155 0.154 16.16 01610 0.002 0.885 0.001 0.001 0.155 0.155 16.25 01615 0.002 0.887 0.001 0.001 0.155 0.155 16.33 01620 0.002 0.889 0.001 0.001 0.155 0.155 16.41 01625 0.002 0.891 0.001 0.001 0.155 0.155 16.50 01630 0.002 0.893 0.001 0.001 0.155 0.155 16.58 01635 0.002 0.895 0.000 0.001 0.129 0.143 16.66 01640 0.002 0.896 0.000 0.001 0.129 0.132 16.75 01645 0.002 0.898 0.000 0.001 0.130 0.127 16.83 01650 0.002 0.900 0.000 0.001 0.130 0.130 16.91 01655 0.002 0.901 0.000 0.001 0.130 0.130 17.00 01700 0.002 0.903 0.000 0.001 0.130 0.130 17.08 01705 0.002 0.905 0.000 0.001 0.130 0.130 17.16 01710 0.002 0.906 0.000 0.001 0.130 0.130 17.25 01715 0.002 0.908 0.000 0.001 0.130 0.130 17.33 01720 0.002 0.910 0.000 0.001 0.130 0.130 17.41 01725 0.002 0.911 0.000 0.001 0.130 0.130 17.50 01730 0.002 0.913 0.000 0.001 0.130 0.130 17.58 01735 0.002 0.915 0.000 0.001 0.130 0.130 17.66 01740 0.002 0.916 0.000 0.001 0.130 0.130 17.75 01745 0.002 0.918 0.000 0.001 0.130 0.130 17.83 01750 0.001 0.919 0.000 0.001 0.104 0.118 17.91 01755 0.001 0.921 0.000 0.001 0.104 0.107 18.00 01800 0.001 0.922 0.000 0.001 0.105 0.102 18.08 01805 0.001 0.923 0.000 0.001 0.105 0.105 18.16 01810 0.001 0.925 0.000 0.001 0.105 0.105 18.25 01815 0.001 0.926 0.000 0.001 0.105 0.105 18.33 01820 0.001 0.927 0.000 0.001 0.105 0.105 18.41 01825 0.001 0.929 0.000 0.001 0.105 0.105 18.50 01830 0.001 0.930 0.000 0.001 0.105 0.105 18.58 01835 0.001 0.931 0.000 0.001 0.105 0.105 18.66 01840 0.001 0.933 0.000 0.001 0.105 0.105 18.75 01845 0.001 0.934 0.000 0.001 0.105 0.105 18.83 01850 0.001 0.935 0.000 0.001 0.105 0.105 18.91 01855 0.001 0.937 0.000 0.001 0.105 0.105 19.00 01900 0.001 0.938 0.000 0.001 0.105 0.105 19.08 01905 0.001 0.939 0.000 0.001 0.105 0.105 19.16 01910 0.001 0.941 0.000 0.001 0.105 0.105 19.25 01915 0.001 0.942 0.000 0.001 0.105 0.105 19.33 01920 0.001 0.943 0.000 0.001 0.105 0.105 19.41 01925 0.001 0.945 0.000 0.001 0.105 0.105 19.50 01930 0.001 0.946 0.000 0.001 0.105 0.105 19.58 01935 0.001 0.947 0.000 0.001 0.105 0.105 19.66 01940 0.001 0.949 0.000 0.001 0.105 0.105 19.75 01945 0.001 0.950 0.000 0.001 0.106 0.105 19.83 01950 0.001 0.951 0.000 0.001 0.079 0.093 19.91 01955 0.001 0.952 0.000 0.001 0.079 0.082 20.00 02000 0.001 0.953 0.000 0.001 0.079 0.077 20.08 02005 0.001 0.954 0.000 0.001 0.079 0.079 20.16 02010 0.001 0.955 0.000 0.001 0.079 0.079 20.25 02015 0.001 0.956 0.000 0.001 0.079 0.079 20.33 02020 0.001 0.957 0.000 0.001 0.079 0.079 20.41 02025 0.001 0.958 0.000 0.001 0.079 0.079 20.50 02030 0.001 0.959 0.000 0.001 0.079 0.079 20.58 02035 0.001 0.960 0.000 0.001 0.079 0.079 20.66 02040 0.001 0.961 0.000 0.001 0.079 0.079 20.75 02045 0.001 0.962 0.000 0.001 0.079 0.079 20.83 02050 0.001 0.963 0.000 0.001 0.079 0.079 20.91 02055 0.001 0.964 0.000 0.001 0.080 0.079 21.00 02100 0.001 0.965 0.000 0.001 0.080 0.080 21.08 02105 0.001 0.966 0.000 0.001 0.080 0.080 21.16 02110 0.001 0.967 0.000 0.001 0.080 0.080 21.25 02115 0.001 0.968 0.000 0.001 0.080 0.080 21.33 02120 0.001 0.969 0.000 0.001 0.080 0.080 21.41 02125 0.001 0.970 0.000 0.001 0.080 0.080 21.50 02130 0.001 0.971 0.000 0.001 0.080 0.080 21.58 02135 0.001 0.972 0.000 0.001 0.080 0.080 21.66 02140 0.001 0.973 0.000 0.001 0.080 0.080 21.75 02145 0.001 0.974 0.000 0.001 0.080 0.080 21.83 02150 0.001 0.975 0.000 0.001 0.080 0.080 21.91 02155 0.001 0.976 0.000 0.001 0.080 0.080 22.00 02200 0.001 0.977 0.000 0.001 0.080 0.080 22.08 02205 0.001 0.978 0.000 0.001 0.080 0.080 22.16 02210 0.001 0.979 0.000 0.001 0.080 0.080 22.25 02215 0.001 0.980 0.000 0.001 0.080 0.080 22.33 02220 0.001 0.981 0.000 0.001 0.080 0.080 22.41 02225 0.001 0.982 0.000 0.001 0.080 0.080 22.50 02230 0.001 0.983 0.000 0.001 0.080 0.080 22.58 02235 0.001 0.984 0.000 0.001 0.080 0.080 22.66 02240 0.001 0.985 0.000 0.001 0.080 0.080 22.75 02245 0.001 0.986 0.000 0.001 0.080 0.080 22.83 02250 0.001 0.987 0.000 0.001 0.080 0.080 22.91 02255 0.001 0.988 0.000 0.001 0.080 0.080 23.00 02300 0.001 0.989 0.000 0.001 0.080 0.080 23.08 02305 0.001 0.990 0.000 0.001 0.080 0.080 23.16 02310 0.001 0.991 0.000 0.001 0.080 0.080 23.25 02315 0.001 0.992 0.000 0.001 0.080 0.080 23.33 02320 0.001 0.993 0.000 0.001 0.080 0.080 23.41 02325 0.001 0.994 0.000 0.001 0.080 0.080 23.50 02330 0.001 0.995 0.000 0.001 0.080 0.080 23.58 02335 0.001 0.996 0.000 0.001 0.080 0.080 23.66 02340 0.001 0.997 0.000 0.001 0.080 0.080 23.75 02345 0.001 0.998 0.000 0.001 0.080 0.080 23.83 02350 0.001 0.999 0.000 0.000 0.054 0.068 23.91 02355 0.001 0.999 0.000 0.000 0.054 0.056 24.00 00000 0.001 1.000 0.000 0.000 0.054 0.051 24.08 00005 0.000 1.000 0.000 0.000 0.000 0.029 1.000 0.419 0.581 0.581 Totals for Watershed in inches over 9.13 acres Rational Coefficient = 0.581 Peak Flow (cfs) = 06.32 90 3• $? ? ?g E ? 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