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Home My WebLink AboutSW8040345_COMPLIANCE_20040628STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SWTQ90'ZFI� DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE �P COMPLIANCE EVALUATION INSPECTION DOC DATE �{Ib�Ol22�Sf YYYYMMDD INFIL I RATION TRENCH ANALYSIS Filename: S:IWPDATAIWQSIINTRENCH1040345.jun04 Project # 040345.jun04 Project Name Crosswinds Townhomes Phase IV Recvng Stream ICWW Drainage Basin Cape Fear Site Area 1.58 acres Impervious Area Calculation Buildings 6426 Parking/Asphalt 11315 Concrete Total €€a17A 7 Volume/Storage Calculation If Rational Method is used, place a 1 in this box Required Provided Design Storm RV VolU a to store Pipe Diameter Length Of a Single run of Pipe Number of Pipe Runs in Trench Storage In Piping Total Storage in Piping Cross -Sectional Area Of Pipe Runs Length Of Trench Width Of Trench Height Of Trench Cross -Sectional Area Of Trench Voids Volume, 40% Trench Volume per linear foot Minimum Trench length required Total Volume Provided Elevation Of Bottom Of Trench Elevation Of SHWT Overflow Elevation Exfiltration Rate /Drawdown Reported Hydraulic Conductivity Bottom Surface Area Q j�a vi ci ovtii ri T i �i e Date 28-Jun-04 Reviewer L Munn Classification Index # Drainage Area 25854 SF 0.59 Acres Rational Cc (list C after each BUA) 1 1 % Impervious= 68.6% Cc: 0.75 1.5 in 0.67 €29€ CF Pipe Size I Pipe Size 2 0.5 Feet 266 Feet 1 0 52 Cubic Feet 52 Cubic Feet .................... 0.000 0.196 266 Feet 10 Feet 1 Feet 10.00 SF € ;1043€ CF 4`12 Cubic Feet =524 Feet aQ9:5 Cubic Feet Comments: Required volume, storage, and drawdown guidelines are met. 5.25 Mean Sea Level 3.25 Mean Sea Level 7 Mean Sea Level 2.3 Cubic Feet Per Hour Per Sq Ft 2660 Square Feet a`0:3.5 hours 10-IR = 2,11L, ✓ INFILTRATION TRENCH ANALYSIS Filename: Project # 040345.jun04 Date Project Name Crosswinds Townhomes Phase IV Reviewer Recvng Stream ICWW Classification Drainage Basin Cape Fear Index # Site Area 1.58 acres Drainage Area Impervious Area Calculation Buildings 6426 Parking/Asphalt 11315 Concrete Total ' 1'14t:: Volume/Storage Calculation If Rational Method is used, place a 1 in this box 0 Required Design Storm RV .................. 11i71t1rri�€to€$tire Provided Pipe Diameter Length Of a Single run of Pipe Number of Pipe Runs in Trench Storage In Piping Total Storage in Piping Cross -Sectional Area Of Pipe Runs Length Of Trench Width Of Trench Height Of Trench Cross -Sectional Area Of Trench Voids Volume, 40% Trench Volume per linear foot Minimum Trench length required Total Volume Provided Elevation Of Bottom Of Trench Elevation Of SHWT Overflow Elevation Exfil tra Pion Ra to / Drawdown Reported Hydraulic Conductivity Bottom Surface Area .................. Drawdown lt. me S:\WPDATA\WQSkINTRENCH\040345.junO4 28-Jun-04 L Munn 25854 SF 0.59 Acres Rational Cc (list C after each BUA) 1 1 % Impervious- 68.6% Cc: 0.75 1.5 in 0.67 €€2tT CF Pipe Size 1 Pipe Size 2 0.5 Feet 262 Feet 1 0 51 Cubic Feet €€51 Cubic Feet 0.000 0.196 262 Feet 10 Feet 1 Feet 10.00 SF 1:027: CF 412 Cubic Feet i i524'? Feet 1.0.79 Cubic Feet 5.25 Mean Sea Level 3.25 Mean Sea Level 7 Mean Sea Level Comments: Required volume, storage, and drawdown guidelines are met. 2.3 Cubic Feet Per Hour Per Sq Ft 2620 Square Feet '6.36? hours R1 INFILTRATION BASIN ANALYSIS FILENAME: S:IWQSIINBASIN1040345.jun04.XLS PROJECT NUMBER: 040345.jun04 DATE: 29-Jon-04 PROJECT NAME: Crosswinds Townhomes - Phase IV DRAINAGE BASIN: Cape Fear REVIEWER: L Munn R VING STREAM: ICWW CLASS: SA Index No.: If ORW, is site within the 575' AEC? (�DA#2 AREA 1.58 acres DRAINAGE AREA: 139 SF IMPERVIOUS AREA CALCULATION BUILDINGS PARKING/ASPHALT CONCRETE OTHER TOTAL % IMPERVIOUS, I= ELEVATION OF SEASONAL HIGH WATER TABLE REPORTED INFILTRATION RATE SURFACE AREAS AND ELEVATIONS Rational C 12852 0.95 Place a "1" here if Rational RV= .05+.009 (I) FEET MSL i27i5 INCHES/HOUR or 0.000637 FPS Elev. (ft) Area, sq ft Inc. Volume Acc. Volume BOTTOM 5.25 516 -1354.5-1354.5 0-1354.5 TOP 7 1233 4315.5 2961 VOLUME 1 DEPTH 1 DRAWDOWN CALCULATION DESIGN STORM, INCHES DESIGN VOLUME TOTAL VOLUME AVAILABLE DEPTH OF RUNOFF TIME TO DRAWDOWN 25 YEAR 24 HOUR STORM NIA Intensity, i = .33 inches 1 hour Qr=CiA= Qp through the bottom of the basin= 10 YEAR 10 MIN HIGH INTENSITY EVENT Intensity, i = 6.3 inches I hour Volume for 10 yr. 10 min. event = CUBIC FEET CUBIC FEET FEET HOURS MUST BE <120 0.09 CFS 0.33 CFS Must be > Qr 1067.77 CF < 1530.375 CF COMMENTS Volume and drawdown are (not) within Design Requirements. INFILTRATION BASIN ANALYSIS PROJECT NUMBER: PROJECT NAME: DRAINAGE BASIN: R VING STREAM: Index No.: DA ITE AREA 1. FILENAME: S:1WQS11NBASIN1040345.jun04.XLS 040345.jun04 DATE: 29-Jun-04 Crosswinds Townhomes - Phase IV Cape Fear REVIEWER: L Munn ICW W CLASS: SA If ORW, is site within the 575' AEC? acres DRAINAGE AREA: 13d6$ SF IMPERVIOUS AREA CALCULATION BUILDINGS PARKING/ASPHALT CONCRETE OTHER TOTAL % IMPERVIOUS, 1= ELEVATION OF SEASONAL HIGH WATER TABLE REPORTED INFILTRATION RATE SURFACE AREAS AND ELEVATIONS Rational C 6426 0.95 Elev. (ft) Area, sq ft Inc. Volume Acc, Volume BOTTOM 5.25 219 -574.875-574.875 0-574.875 TOP 7 736 2576 2001.125 VOLUME I DEPTH I DRAWDOWN CALCULATION DESIGN STORM, INCHES DESIGN VOLUME TOTAL VOLUME AVAILABLE DEPTH OF RUNOFF TIME TO DRAWDOWN 25 YEAR 24 HOUR STORM NIA Intensity, i = .33 inches 1 hour Qr=CiA= Qp through the bottom of the basin= 10 YEAR 10 MIN HIGH INTENSITY EVENT Intensity, i = 6.3 inches 1 hour Volume for 10 yr. 10 min. event = y 805 CUBIC FEET 835625 CUBIC FEET : 7.5 FEET €:1 HOURS MUST BE <120 0.06 CFS 0.14 CFS Must be > Qr 645.02 CF < 835,625 CF COMMENTS Volume and drawdown are (not) within Design Requirements. INFILTRATION TRENCH ANALYSIS Filename Project # 040345.jun04 Date Project Name Crosswinds Townhomes Phase IV Reviewer Recvng Stream ICWW Classification Drainage Basin Cape Fear Index # Site Area 1.58 acres Drainage Area OA-6,q Impervious Area Calculation Buildings 0 Parking/Asphalt 3920 Concrete Total 3920: Volume/Storage Calculation If Rational Method is used, place a 1 in this box Required Provided Design Storm RV :Vol iris:#� Store Pipe Diameter Length Of a Single run of Pipe Number of Pipe Runs in Trench Storage In Piping Total Storage in Piping Cross -Sectional Area Of Pipe Runs Length Of Trench Width Of Trench Height Of Trench Cross -Sectional Area Of Trench Voids Volume, 40% Trench Volume per linear foot Minimum Trench length required Total Volume Provided Elevation Of Bottom Of Trench Elevation Of SHWT Overflow Elevation Exfiltration Rate/Drawdown Reported Hydraulic Conductivity Bottom Surface Area D awdq.wn JIr; ie S:\WPDATA\WQS\INTRENCH\040345.junO4 28-Jun-04 L Munn 3920 SF 0.09 Acres Rational Cc (list C after each BUA) 1 % Impervious: 100.0% Cc: 1.00 1.5 in 0.95 it6t ': CIF Pipe Size I Pipe Size 2 0.5 Feet 114 Feet 1 0 22 Cubic Feet 2i Cubic Feet 0.000 0.195 114 Feet 10 Feet 1 Feet 10.00 SF CF 1:2 Cubic Feet '1113',i Feet Cubic Feet Mean Sea Level Mean Sea Level Mean Sea Level 2.3 Cubic Feet Per Hour Per Sq Ft 1140 Square Feet hours Comments: Required volume, storage, and drawdown guidelines are met.