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DRAINAGE STATEMENT (NOV 1999)
HIGH RIDGE PROPERTIES DRAINAGE STATEMENT FOR CLARK CONSTUCTION, INC. The 4.3-acre high Ridge Properties parcel is located in the West 340 feet of the North ~ of the Northwest ~ of the Northwest ~ of Section 16, Township 45 South, Range 43 East. The site has an existing 0.8-acre warehouse facility on the southerly portion with a finished floor elevation of23.00. The proposed site has a total building area of 1.63-acres and a parking area of 2. 15-:acres. Presently storm water run off from the site flows overland to the east. The proposed drainage system consists of a 1,024 feet of 6 feet wide by 4 feet deep exfiltration trench, a six-inch diameter outfall pipe which drains into the City of Boynton Beaches existing roadside swale along Industrial Way, and a perimeter berm at elevation 21.0 feet N.G.Y.D., which is the 25 year- 3 day storm elevation. The loading docks for the existing building are at elevation 19.0 and for the proposed building are at elevation 20.0 feet N.G.V.D., both of which are above the 5 year - 24 hour storm elevation of 16.67 feet N.G.V.D. Parking areas are at elevation 20.0 feet N.G.Y.D., which is above the 5 year- 24-hour storm elevation of 16.67 feet N.G.V.D. Driveways are at or above elevation 20.5 feet N.G. V.D., which is above the 10 year - 3- day storm elevation of20.34 feet N.G.Y.D. The minimum finish floor elevation of23.0 is above the zero discharge elevation of22.96 feet N.G.V.D. Storm water discharge from the site is limited to a 6-inch diameter pipe with an invert elevation of 19.75 feet N.G.V.D., which is located at the southeast comer of the property. The discharge elevation is above the above the 5 year - 24-hour storm elevation of 16.67 feet N.G.V.D. Discharge from the site at elevation 21.0 feet N.G.V.D. The proposed peak discharge from the 25 year - 3 day storm elevation of 1.2 C.F.S., is less than the existing peak discharge from the 10-year- one-hour storm of the for the site, and the predevelopment peak discharge from the I O-year - one-hour storm of the for the site. The existing discharge, for the ten year one hour rainfall, using the Rational Method, since the existing site has no water management facilities is equal to Q=CIA, where C = .4, I = 5.1 inches for a one half hour time of concentration, and A = 4.30 Acres. Therefore Q = 8.8 CFS existing. Using a C =.] for conditions prior to construction of the existing building, and 1= 3.6 inches for a one hour time of concentration, and A = 4.30 Acres, Q= 1.5 CFS. 99-O32( 99032-DR-STMT) II (1Jt1'1 CUNNINGHAM & DURRANCE Consulting Engineers, Inc. WATER MANAGEMENT CALCULATIONS FOR HIGH RIDGE PROPERTIES /. GIVEN: A. ACREAGES 1. TOTAL AREA (AC.) 4.30 2. IMPERVIOUS a. Building (Ae.) 1.64 b. Paved Areas (Ae.) 1.97 3. LAKE 0.00 4. RETENTION AREA 0.08 5.a. PERVIOUS (OPEN SPACE) 0.62 b. PERVIOUS (LAKE BANK) 0.00 e. PERVIOUS (UPLAND PRESERVE) 0.00 TOTAL PERVIOUS 0.70 6. COMMERCIAL (AC.) 4.30 B. MINIMUM ELEVATION 1. ROADS & PARKING 20.0 . 2. FINISHED FLOOR ELEVATION 23.0 C. LAND USE COMMERCIAL D. WATER LEVEL ELEVATION 1. WET SEASON GWT EL. 10.0 2. DRY SEASON GWT EL. 9.0 3. RETENTION AREA EL. 19.5 4. CONTROL WATER EL. (NGVD) 14.0 E. 3 YEAR 24 HOUR RAINFALL (IN.) 6.5 F. 5 YEAR 24 HOUR RAINFALL (IN.) 8.0 G. 10 YEAR 24 HOUR RAINFALL (IN.) 10.0 H. 25 YEAR 24 HOUR RAINFALL (IN.) 12.0 I. 100 YEAR 24 HOUR RAINFALL (IN.) 15.5 J. ALLOWABLE DISCHARGE (CFS) 1.2 WATER MANAGEMENT CALCULATIONS FOR HIGH RIDGE PROPERTIES II. COMPUTATIONS A. QUALITY 1. FIRST 1" RUNOFF (AC. FT.) 0.36 2. 2.5" X % IMPERVIOUS (AC. FT.) a. Site Area for Water Quality 2.66 b. Impervious Area 1.97 c. Water Quality % Impervious 0.74 d. 2.5" X % Impervious (In.) 1.85 e. Volume Detention Reqd. (Ae. Ft.) 0.66 3. DRY DETENTION VOLUME REQUIRED FIRST 0.5" RUNOFF (AC. FT.) 0.18 4. QUALITY LAKE VOLUME REQD. (AC.) 0.48 B. STAGE/STORAGE (SEE INDIVIDUAL BASIN CALCULATIONS) C. WEIR CREST EL. (N.G.v.D.) 14.60 D. CONTROL STRUCTURE DETENTION WEIR 1. BASIN DAILY DISCHARGE VOL. (AC.FT.) 0.18 2. TOTAL DAILY DISCHARGE VOL. (AC.FT.) 0.18 3. DISCHARGE VOLUME (C.F.S.) 0.09 4. V NOTCH ORIFICE a. COMPUTE V-NOTCH ANGLE (DEGREES) 18 b. COMPUTE WEIR LENGTH @ CREST (IN.) 2 5. RECTANGULAR ORIFICE a. HEIGHT (FT.) 0.60 b. WIDTH (FT.) 0.06 c. AREA (SQ. FT.) 0.04 6. CIRCULAR ORIFICE a. DIAMETER (FT.) 0.18 WATER MANAGEMENT CALCULATIONS FOR HIGH RIDGE PROPERTIES E. DETERMINE SOIL STORAGE 1. IMPERVIOUS AREA (ACRE) 3.61 2. PERVIOUS AREA (ACRE) 0.70 3. COMPUTE DEPTH TO WATER TABLE a. Avg. finish site elevation (NGVD) 21.7 b. Wet season avg. GWT EL. (NGVD) 10.0 c. Avg. depth to water table (Ft) 11.7 4. AVAILABLE SOIL MOISTURE STORAGE FROM FIGURE C-III-1 (IN.) 8.18 5. COMPOSITE SOIL STORAGE (IN.) 1.3 F. DETERMINE MAXIMUM DESIGN STORM EL. 1. TOTAL 3-DAY RAINFALL (P) (IN.) 8.8 2. TOTAL RUNOFF (INCHES) 7.4 3. TOTAL RUNOFF VOLUME (AC.-FT.) 2.7 4. ZERO DISCHARGE STAGE (FT. NGVD) 17.5 G. DETERMINE OVERFLOW WEIR SIZE 1. MAXIMUM DESIGN HEAD (FT.) 2.9 2. FLOW THRU BLEEDER (CFS) 0.29 3. OVERFLOW WEIR LENGTH (FT.) 0.06 H. CHECK MINIMUM FINISH FLOOR EL. 1. TOTAL 3-DAY RAINFALL (P) (IN.) 21,1 2. TOTAL RUNOFF (INCHES) 19.6 3. TOTAL RUNOFF VOLUME (AC.-FT.) 7.0 4. ZERO DISCHARGE STAGE (FT. NGVD) 23.0 HIGH RIDGE PROPERTIES STAGE/DISCHARGE COMPUTATION BLEEDER SLOT BLEEDER SLOT TYPE: CIRCULAR CIRCULAR Diameter 0.00 IN. 6.00 IN. WIDTH: 0.00 IN. 0.00 IN. AREA: 0.00 SF 0.20 SF ELEV.: 19.83 FT. 19.75 FT. COEF: 0.60 0.60 CA: 0.00 0.12 H2: 0.00 FT. 0.25 FT. STAGE CONTROL OVERFLOW EXFIL TRATION TOTAL FEET DISCH. DISCH. DISCHARGE DISCH. NGVD (CFS) (CFS) (CFS) (CFS) 14.00 0.00 0.00 0.00 0.00 15.00 0.00 0.00 0.12 0.12 16.00 0.00 0.00 0.15 0.15 17.00 0.00 0.00 0.18 0.18 18.00 0.00 0.00 0.20 0.20 18.50 0.00 0.00 0.20 0.20 20.00 0.00 0.07 0.21 0.28 20.50 0.00 0.67 0.23 0.91 21.00 0.00 0.95 0.26 1.20 22.00 0.00 1.34 0.28 1.62 23.00 0.00 1.64 0.30 1.94 HIGH RIDGE PROPERTIES STAGE/STORAGE COMPUTATION FOR HIGH RIDGE PROPERTIES NAME LAKE SITE RETENTION EXFIL TRA TION BUILDING TOTAL GRADING AREA VOLUME AREA (ACRE) (ACRE) (ACRE) (AC-FT) (ACRE) (ACRE) AREA 0.000 2.664 0.080 3.075 1.640 4.304 START EL. 14.00 19.50 18.50 14.00 23.04 END EL. 23.04 23.94 19.50 18.00 STAGE LAKE SITE PRESERVE DETENTION TOTAL AVAILABLE FEET STORAGE STORAGE STORAGE STORAGE STORAGE STORAGE NGVD AC-FT AC-FT AC-FT AC-FT AC-FT AC-FT 14.00 0.00 0.00 0.00 0.00 0.00 0.00 15.00 0.00 0.00 0.00 0.77 0.77 0.77 17.00 0.00 0.00 0.00 2.31 2.31 2.31 18.00 0.00 0.00 0.00 3.07 3.07 3.07 18.50 0.00 0.00 0.00 3.07 3.07 3.07 19.50 0.00 0.00 0.04 3.07 3.11 3.11 20.00 0.00 0.07 0.08 3.07 3.23 3.23 21.00 0.00 0.67 0.16 3.07 3.91 3.91 22.00 0.00 1.87 0.24 3.07 5.19 5.19 23.04 0.00 3.76 0.32 3.07 7.16 7.16 S C S PROGRAM PROJECT NAME ENGINEER PROJECT AREA GROUND STORAGE TERMINATION DISCHARGE DISTRIBUTION TYPE RETURN FREQUENCY RAINFALL DURATION 24-HOUR RAINFALL REPORTING SEQUENCE HIGH RIDGE PROPERTIES CUNNINGHAM & DURRANCE 4.30 ACRES 1.00 INCHES .10 CFS SFWMD 25.00 YEARS 3-DAY 12.00 INCHES STANDARDIZED STAGE STORAGE (FT) (AF) 14.00 .00 15.00 .85 17.00 2.56 18.00 3.41 19.50 3.41 20.00 3.49 20.50 3.72 21.00 4.11 22.00 5.34 23.00 7.18 DISCHARGE (CFS) .00 .13 .19 .21 .21 .29 .92 1.22 1. 64 1. 96 - - - - - - R E S E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DISCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF) (CFS) (CFS) (FT) .00 .00 .00 .0 .0 .0 .0 .0 .0 14.00 4.00 .29 .01 .0 .0 .0 .0 .0 .0 14.00 8.00 .58 .11 .1 .0 .0 .0 .0 .0 14.04. 12.00 .88 .27 .2 .1 .1 .0 .0 .0 14.11 16.00 1.17 .48 .2 .2 .2 .0 .0 .0 14.19 20.00 1.46 .70 .3 .3 .2 .1 .0 .0 14.27 24.00 1. 75 .94 .3 .3 .3 .0 .0 .0 14.36 28.00 2.18 1.31 .4 .5 .4 .1 .1 .1 14.49 32.00 2.60 1. 70 .4 .6 .5 .1 .1 .1 14. 62 36.00 3.03 2.09 .4 .7 .6 .1 .1 .1 14.75 40.00 3.46 2.49 .4 .9 .8 .1 .1 .1 14.88 44.00 3.88 2.90 .4 1.0 .'9 .1 .1 .1 15.00 48.00 4.31 3.30 .4 1.2 1.0 .2 .1 .1 15.12 52.00 4.85 3.83 .7 1.4 1.1 .3 .1 .1 15.29 56.00 5.95 4.90 1.5 1.8 1.4 .4 .2 .1 15.67 58.00 6.86 5.79 2.2 2.1 1.7 .4 .2 .2 16.01 59.00 7.54 6.46 3.3 2.3 2.0 .3 .2 .2 16.26 59.50 8.14 7.05 5.1 2.5 2.2 .3 .2 .2 16.47 - - - - - - R E S E R V 0 I R - - RAIN ACCUM. BAS IN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DISCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF) (CFS) (CFS) (FT) 59.75 9.94 8.83 30.9 3.2 2.8 .4 .2 .2 16.90 60.00 12.18 11.06 38.6 4.0 3.6 .4 .2 .2 17.74 60.50 13.06 11. 93 7.6 4.3 3.9 .4 1.0 ., 20.60 . I 61. 00 13.51 12.38 3.9 4.4 4.0 .4 1.1 1.0 20.80 62.00 14.12 12.99 2.4 4.7 4.1 .6 1.2 1.2 20.98 64.00 14.87 13.73 .1. 6 4.9 4.2 .7 1.2 1.2 21.04 68.00 15.73 14.59 .9 5.2 4.1 1.1 1.2 1.2 20.96 72.00 16.31 15.17 .6 5.4 3.9 1.5 1.1 1.1 20.74 80.00 16.31 15.17 .0 5.4 3.5 1.9 .3 .7 19.93 88.00 16.31 15.17 .0 5.4 3.3 2.1 .2 .2 17.91 96.00 16.31 15.17 .0 5.4 3.2 2.2 .2 .2 17.75 104.00 16.31 15.17 .0 5.4 3.1 2.3 .2 .2 17.59 112.00 16.31 15.17 .0 5.4 2.9 2.5 .2 .2 17.43 120.00 16.31 15.17 .0 5.4 2.8 2.6 .2 .2 17.28 128.00 16.31 15.17 .0 5.4 2.7 2.7 .2 .2 17 .13 136.00 16.31 15.17 .0 5.4 2.5 2.9 .2 .2 16.98 144.00 16.31 15.17 .0 5.4 2.4 3.0 .2 .2 16.83 152.00 16.31 15.17 .0 . 5.4 2.3 3.1 .2 .2 16.69 160.00 16.31 15.17 .0 5.4 2.2 3.2 .2 .2 16.56 168.00 16.31 15.17 .0 5.4 2.1 3.3 .2 .2 16.42 176.00 16.31 15.17 .0 5.4 2.0 3.4 .2 .2 16.29 184.00 16.31 15.17 .0 5.4 1.8 3.6 .2 .2 16.16 192.00 16.31 15.17 .0 5.4 1.7 3.7 .2 ') 16.03 . "- 200.00 16.31 15.17 . 0 5.4 1.6 3.8 .2 . 2 15.91 208.00 16.31 15.17 . 0 5.4 1.5 3.9 .2 . L- 15.79 216.00 16.31 15.17 .0 5.4 1.4 4.0 .2 .2 15.67 224.00 16.31 15.17 .0 5.4 1.3 4.1 .1 .1 15.56 232.00 16.31 15.17 .0 5.4 1.2 4.2 .1 .1 15.45 240.00 16.31 15.17 .0 5.4 1.1 4.3 .1 .1 15.34 248.00 16.31 15.17 .0 5.4 1.0 4.4 .1 .1 15.23 256.00 16.31 15.17 .0 5.4 1.0 4.4 .1 .1 15.12 264.00 16.31 15.17 .0 5.4 .9 4.5 .1 .1 15.02 272.00 16.31 15.17 .0 5.4 .8 4.6 .1 .1 14.92 280.00 16.31 15.17 .0 5.4 .7 4.7 .1 .1 14.84 286.75 16.31 15.17 .0 5.4 .7 4.7 .1 .1 14.77 SUMMARY INFORMATION MAXIMUM STAGE WAS 21.04 FEET AT 64.25 HOURS MAXIMUM DISCHARGE WAS 1.2 CFS AT 64.25 HOURS S C S PRO G RAM PROJECT NAME ENGINEER PROJECT AREA GROUND STORAGE TERMINATION DISCHARGE DISTRIBUTION TYPE RETURN FREQUENCY RAINFALL DURATION 24-HOUR RAINFALL REPORTING SEQUENCE HIGH RIDGE PROPERTIES CUNNINGHAM & DURRANCE 4.30 ACRES 1.00 INCHES .10 CFS S FWMD 10.00 YEARS 3-DAY 10.00 INCHES STANDARDIZED STAGE STORAGE. DISCHARGE (FT) (AF) (CFS) 14.00 .00 .00 15.00 .85 .13 17.00 2.56 .19 18.00 3.41 .21 19.50 3.41 .21 20.00 3.49 .29 20.50 3.72 .92 21. 00 4.11 1.22 22.00 5.34 1. 64 23.00 7.18 1. 96 - - - - - - R E S E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DISCHGE DISCHGE STAGE (HR) ( IN) (IN) (CFS) (AF) (AF) (AF) (CFS) (CFS) (FT) .00 .00 .00 .0 .0 .0 .0 .0 .0 14.00 4.00 .24 .00 .0 .0 .0 .0 .0 .0 14.00 8.00 .49 .06 .1 .0 .0 .0 .0 .0 14.03 12.00 .73 .18 .1 .1 .1 .0 .0 .0 14.07 16.00 .97 .34 .2 .1 .1 .0 .0 .0 14.13 20.00 1.22 .51 .2 .2 .2 .0 .0 .0 14.20 24.00 1. 46 .70 .2 .3 .2 .1 .0 .0 14.27 28.00 1. 82 1.00 .3 .4 .3 .1 .0 .0 14.37 32.00 2.17 1. 31 .3 .5 .4 .1 .1 .1 14.48 36.00 2.53 1. 63 .3 .6 .5 .1 .1 .1 14.59 40.00 2.88 1. 95 .4 .7 .6 .1 .1 .1 14.69 44.00 3.24 2.28 .4 .8 .7 .1 .1 .1 14.80 48.00 3.59 2.62 .4 .9 .8 .1 .1 .1 14.89 52.00 4.04 3.05 .6 1.1 .9 .2 .1 .1 15.02 56.00 4.96 3.93 1.3 1.4 1.1 .3 .1 .1 15.33 58.00 5.72 4.67 1.9 1.7 1.4 .3 .1 .1 15.61 59.00 6.28 5.22 2.7 1.9 1.6 .3 .2 .2 15.81 59.50 6.78 5.71 4.3 2.0 1.7 .3 .2 .2 15.99 - - - - - - R E S E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DISCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF) (CFS) (CFS) (FT) 59.75 8.28 7.19 25.6 2.6 2.3 .3 .2 .2 16.35 60.00 10.15 9.04 32.1 3.2 2.9 .3 .2 .2 17.04 60.50 10.88 9.77 6.3 3.5 3.2 .3 .2 .2 17.65 61.00 11.26 10.14 3.3 3.6 3.3 .3 .2 .2 17.84 62.00 11.77 10.65 2.0 3.8 3.5 .3 .3 .2 19.76 64.00 12.39 11. 27 1.3 4.0 3.6 .4 .6 .4 20.26 68.00 13.11 11.98 .8 4.3 3.7 .6 .7 .7 20.34 72.00 13.59 12.46 .5 4.5 3.6 .9 .6 .7 20.25 80.00 13.59 12.46 .0 4.5 3.4 1.1 .2 .3 17.98 88.00 13.59 12.46 .0 4.5 3.3 1.2 .2 .2 17.82 96.00 13.59 12.46 .0 4.5 3.1 1.4 .2 .2 17.66 104.00 13.59 12.46 .0 4.5 3.0 1.5 .2 .2 17.51 112.00 13.59 12.46 .0 4.5 2.9 1.6 .2 .2 17 .35 120.00 13.59 12.46 .0 4.5 2.7 1.8 .2 .2 17 .20 128.00 13.59 12.46 .0 4.5 2.6 1.9 .2 .2 17.05 136.00 13.59 12.46 .0 4.5 2.5 2.0 .2 .2 16.90 144.00 13.59 12.46 .0 4.5 2.4 2.1 .2 .2 16.76 152.00 13.59 12.46 .0 4.5 2.2 2.3 .2 .2 16.62 160.00 13.59 12.46 .0 4.5 2.1 2.4 .2 .2 16.48 168.00 13 . 59 12.46 .0 4.5 2.0 2.5 .2 .2 16.35 17 6.00 13.59 12.46 .0 4.5 1.9 2.6 .2 .2 16.22 184.00 13.59 12.46 .0 4.5 1.8 2.7 .2 .2 16.09 192.00 13.59 12.46 .0 4.5 1.7 2.8 .2 .2 15.97 200.00 13.59 12.46 .0 4.5 1.6 2.9 .2 .2 15.85 208.00 13.59 12.46 .0 4.5 1.5 3.0 .2 .2 15.73 216.00 13 . 59 12.46 .0 4.5 1.4 3.1 .1 .2 15.61 224.00 13.59 12.46 .0 4.5 1.3 3.2 .1 .1 15.50 232.00 13.59 12.46 .0 4.5 1.2 3.3 .1 .1 15.39 240.00 13.59 12.46 .0 4.5 1.1 3.4 .1 .1 15.28 248.00 13.59 12.46 .0 4.5 1.0 3.5 .1 .1 15.17 256.00 13.59 12.46 .0 4.5 .9 3.6 .1 .1 15.07 264.00 13.59 12.46 .0 4.5 .8 3.7 .1 .1 14.97 272.00 13.59 12.46 .0 4.5 .7 3.8 .1 .1 14.88 280.00 13.59 12.46 .0 4.5 .7 3.8 .1 .1 14.79 282.50 13.59 12.46 .0 4.5 .7 3.8 .1 .1 14.77 SUMMARY INFORMATION MAXIMUM STAGE WAS 20.34 FEET AT 68.00 HOURS MAXIMUM DISCHARGE WAS .7 CFS AT 68.00 HOURS S C S PRO G RAM PROJECT NAME ENGINEER PROJECT AREA GROUND STORAGE TERMINATION DISCHARGE DISTRIBUTION TYPE RETURN FREQUENCY RAINFALL DURATION 24-HOUR RAINFALL REPORTING SEQUENCE . . HIGH RIDGE PROPERTIES CUNNINGHAM & DURRANCE 4.30 ACRES 1.00 ,INCHES .10 CFS S FWMD 5.00 YEARS I-DAY 8.00 INCHES STANDARDIZED STAGE STORAGE. DrSCHARGE (FT) (AF) (CFS) 14.00 .00 .00 15.00 .85 .13 17.00 2.56 .19 18.00 3.41 .21 19.50 3.41 .21 20.00 3.49 .29 20.50 3.72 .92 21. 00 4.11 1.22 22.00 5.34 1. 64 23.00 7.18 1. 96 - - - - - - R E S E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DrSCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF) (CFS) (CFS) (FT) .00 .00 .00 .0 .0 .0 .0 .0 .0 14.00 4.00 .36 .02 .1 .0 .0 .0 .0 .0 14.01 8.00 1.10 .42 .7 .2 .1 .1 .0 .0 14.17 10.00 1. 70 .90 1.3 .3 .3 .0 .0 .0 14.36 11.00 2.15 1.29 2.0 .5 .4 .1 .1 .1 14.51 11. 50 2.55 1. 65 3.1 .6 .6 .0 .1 .1 14.64 11.75 3.75 2.77 19.4 1.0 1.0 .0 .1 .1 14.91 12.00 5.25 4.21 25.0 1.5 1.5 .0 .1 .1 15.45 12.50 5.83 4.78 4.9 1.7 1.7 .0 .2 .2 15.92 13.00 6.14 5.08 2.6 1.8 1.8 .0 .2 .2 16.06 14.00 6.54 5.48 1.6 2.0 1.9 .1 .2 .2 16.23 16.00 7.04 5.97 1.0 2.1 2.1 .0 .2 .2 16.41 20.00 7.62 6.53 .6 2.3 2.2 .1 .2 .2 16.58 24.00 8.00 6.91 .4 2.5 2.3 .2 .2 .2 16.67 30.00 8.00 6.91 .0 2.5 2.2 .3 .2 .2 16.57 36.00 8.00 6.91 .0 2.5 2.1 .4 .2 .2 16.47 42.00 8.00 6.91 .0 2.5 2.0 .5 .2 .2 16.37 48.00 8.00 6.91 .0 2.5 1.9 .6 .2 .2 16.27 - - - - - - RES E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DISCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF) . (CFS) (CFS) (FT) 54.00 8.00 6.91 .0 2.5 1.9 .6 .2 .2 16.18 60.00 8.00 6.91 .0 2.5 1.8 .7 .2 .2 16.08 66.00 8.00 6.91 .0 2.5 1.7 .8 .2 .2 15.99 72.00 8.00 6.91 .0 2.5 1.6 .9 .2 .2 15.90 78.00 8.00 6.91 .0 2.5 1.5 1.0 .2 .2 15.81 84.00 8.00 6.91 .0 2.5 1.5 1.0 .2 .2 15.72 90.00 8.00 6.91 .0 2.5 1.4 1.1 .1 .2 15.63 96.00 8.00 6.91 .0 2.5 1.3 1.2 .1 .1 15.55 102.00 8.00 6.91 .0 2.5 1.2 1.3 .1 . ..L 15.46 108.00 8.00 6.91 .0 2.5 1.2 1.3 .1 .1 15.38 114.00 8.00 6.91 .0 2.5 1.1 1.4 .1 .1 15.30 120.00 8.00 6.91 .0 2.5 1.0 1.5 .1 .1 15.22 126.00 8.00 6.91 .0 2.5 1.0 1.5 .1 . - 15.14 132.00 8.00 6.91 .0 2.5 .9 1.6 .1 .1 15.06 138.00 8.00 6.91 .0 2.5 .8 1.7 .1 .1 14.99 144.00 8.00 6.91 .0 2.5 .8 1.7 .1 .1 14.91 150.00 8.00 6.91 .0 2.5 .7 1.8 .1 . ..L 14.85 156.00 8.00 6.91 .0 2.5 .7 1.8 .1 .1 14.79 157.75 8.00 6.91 .0 2.5 .7 1.8 .1 .1 14.77 SUMMARY INFORMATION MAX IMUM STAGE WAS 16.67 FEET AT 24.25 HOURS MAX IMUM DISCHARGE WAS .2 CFS AT 24.25 HOURS S C S PRO G RAM PROJECT NAME ENGINEER PROJECT AREA GROUND STORAGE TERMINATION DISCHARGE DISTRIBUTION TYPE RETURN FREQUENCY RAINFALL DURATION 24-HOUR RAINFALL REPORTING SEQUENCE .' HIGH RIDGE PROPERTIES CUNNINGHAM & DURRANCE 4.30 ACRES 1.0q INCHES .10 CFS S FWMD 3.00 YEARS I-DAY 6.50 INCHES STANDARDIZED STAGE STORAGE DISCHARGE (FT) (AF) (CFS) 14.00 .00 .00 15.00 .85 .13 17 .00 2.56 .19 18.00 3.41 .21 19.50 3.41 .21 20.00 3.49 .29 20.50 3.72 .92 21. 00 4.11 1.22 22.00 5.34 1. 64 23.00 7.18 1. 96 - - - - - - R E S E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DISCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF) (CFS) (CFS) (FT) .00 .00 .00 .0 .0 .0 .0 .0 .0 14.00 4.00 .29 .01 .1 .0 .0 .0 .0 .0 14.00 8.00 .89 .28 .5 .1 .1 .0 .0 .0 14.11 10.00 1. 38 .64 1.0 .2 .2 .0 .0 . C 14.25 11.00 1. 75 .94 1.5 .3 .3 .0 .0 . C 14.37 11.50 2.07 1.22 2.5 .4 .4 .0 .1 .1 14.47 11.75 3.05 2.11 15.4 .8 .7 .1 .1 .1 14.69 12.00 4.26 3.26 20.0 1.2 1.2 .0 .1 .1 15.11 12.50 4.74 3.72 4.0 1.3 1.3 .0 .1 .1 15.49 13.00 4.99 3.96 2.1 1.4 1.4 .0 .1 .1 15.61 14.00 5.32 4.28 1.3 1.5 1.5 .0 .2 . L 15.74 16.00 5.72 4.67 .8 1.7 1.6 .1 .2 .2 15.88 20.00 6.19 5.13 .5 1.8 1.7 .1 .2 " 16.01 . L 24.00 6.50 5.44 .3 1.9 1.8 .1 .2 .2 16.08 30.00 6.50 5.44 .0 1.9 1.7 .2 .2 " 15.99 . L 36.00 6.50 5.44 .0 1.9 1.6 .3 .2 .2 15.90 42.00 6.50 5.44 .0 1.9 1.5 .4 .2 .2 15.81 48.00 6.50 5.44 .0 1.9 1.5 .4 .2 .2 15.72 - - - - - - RES E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW OISCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF) . (CFS) (CFS) (FT) 54.00 6.50 5.44 .0 1.9 1.4 .5 .1 .2 15.63 60.00 6.50 5.44 .0 1.9 1.3 .6 .1 .1 15.55 66.00 6.50 5.44 .0 1.9 1.2 .7 .1 .1 15.46 72.00 6.50 5.44 .0 1.9 1.2 .7 .1 .1 15.38 78.00 6.50 5.44 .0 1.9 1.1 .8 .1 .1 15.30 84.00 6.50 5.44 .0 1.9 1.0 .9 .1 .1 15.22 90.00 6.50 5.44 .0 '1.9 1.0 .9 .1 .1 15.14 96.00 6.50 5.44 .0 1.9 .9 1.0 .1 .1 15.06 102.00 6.50 5.44 .0 1.9 .8 1.1 .1 .1 14.99 108.00 6.50 5.44 .0 1.9 .8 1.1 .1 .1 14.92 114.00 6.50 5.44 .0 1.9 .7 1.2 .1 .1 14.85 120.00 6.50 5.44 .0 1.9 .7 1.2 .1 .1 14.79 122.00 6.50 5.44 .0 1.9 .7 1.2 .1 .1 14.77 SUMMARY INFORMATION MAX IMUM STAGE WAS 16.08 FEET AT 24.25 HOURS MAX I MUM DISCHARGE WAS .2 CFS AT 24.25 HOURS S C S PROGRAM PROJECT NAME ENGINEER PROJECT AREA GROUND STORAGE TERMINATION DISCHARGE DISTRIBUTION TYPE RETURN FREQUENCY RAINFALL DURATION 24-HOUR RAINFALL REPORTING SEQUENCE ., HIGH RIDGE PROPERTIES CUNNINGHAM & DURRANCE 4.30 ACRES 1.00 ,INCHES .10 CFS S FWMD 100.00 YEARS 3-DAY 15.50 INCHES STANDARDIZED STAGE STORAGE. DISCHARGE (FT) (AF) (CFS) 14.00 .00 .00 15.00 .85 .13 17.00 2.56 .19 18.00 3.41 .21 19.50 3.41 .21 20.00 3.49 .29 20.50 3.72 .92 21.00 4.11 1.22 22.00 5.34 1. 64 23.00 7.18 1. 96 - - - - - - R E S E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DISCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF) (CFS) (CFS) (FT) .00 .00 .00 .0 .0 .0 .0 .0 .0 14.00 4.00 .38 .03 .1 .0 .0 .0 .0 .0 14.01 8.00 .75 .20 .2 .1 .1 .0 .0 .0 14.08 12.00 1.13 .45 .3 .2 .2 .0 .0 .0 14.18 16.00 1. 51 .74 .3 .3 .2 .1 .0 .0 14.29 20.00 1. 89 1. 06 .4 .4 .3 .1 .1 .0 14.40 24.00 2.26 1. 39 .4 .5 .4 .1 .1 .1 14.52 28.00 2.81 1. 89 .6 .7 .6 .1 .1 .1 14.70 32.00 3.36 2.40 .6 .9 .7 .2 .1 .1 14.87 36.00 3.91 2.93 .6 1.0 .9 .1 .1 .1 15.05 40.00 4.46 3.45 .6 1.2 1.0 .2 .1 .1 15.22 44.00 5.01 3.99 .6 1.4 1.2 .2 .1 .1 15.39 48.00 5.56 4.52 .6 1.6 1.3 .3 .1 .1 15.55 52.00 6.26 5.20 .9 1.9 1.5 .4 .2 .1 15.78 56.00 7.69 6.61 2.0 2.4 2.0 .4 .2 .2 16.29 58.00 8.87 7.77 2.9 2.8 2.4 .4 .2 .2 16.73 59.00 9.73 8.63 4.3 3.1 2.7 .4 .2 .2 17.06 59.50 10.51 9.40 6.7 3.4 2.9 .5 .2 .2 17.34 - - - - - - RES E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DISCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF) (CFS) (CFS) (FT) 59.75 12.83 11.71 40.1 4.2 3.7 .5 .2 .2 17.91 60.00 15.73 14.59 50.0 5.2 4.8 .4 1.3 .7 21.11 60.50 16.86 15.72 9.8 5.6 5.1 .5 1.5 1.4 21.73 61. 00 17.45 16.31 5.1 5.8 5.3 .5 1.6 1.6 21. 89 62.00 18.24 17.10 3.1 6.1 5.4 .7 1.6 1.6 22.02 64.00 19.20 18.05 -2.0 6.5 5.5 1.0 1.7 1.7 22.06 68.00 20.32 19.17 1.2 6.9 5.3 1.6 1.6 1.6 21. 98 72.00 21. 06 19.91 .8 7.1 5.1 2.0 1.5 1.6 21.77 80.00 21. 06 19.91 .0 7.1 4.2 2.9 1.2 1.4 21.03 88.00 21. 06 19.91 .0 7.1 3.5 3.6 .5 .9 20.13 96.00 21.06 19.91 .0 7.1 3.4 3.7 .2 .3 17.96 104.00 21.06 19.91 .0 7.1 3.2 3.9 .2 .2 17.80 112.00 21. 06 19.91 .0 7.1 3.1 4.0 .2 .2 17.64 120.00 21. 06 19.91 .0 7.1 3.0 4.1 .2 .2 17.48 128.00 21.06 19.91 .0 7.1 2.8 4.3 .2 .2 17.33 136.00 21. 06 19.91 .0 7.1 2.7 4.4 .2 .2 17.17 144.00 21. 06 19.91 .0 7.1 2.6 4.5 .2 .2 17.02 152.00 21. 06 19.91 .0 7.1 2.5 4.6 .2 .2 16.88 160.00 21.06 19.91 .0 7.1 2.3 4.8 .2 .2 16.74 168.00 21. 06 19.91 .0 7.1 2.2 4.9 .2 .2 16.60 176.00 21. 06 19.91 .0 7.1 2.1 5.0 .2 .2 16.46 184.00 21.06 19.91 .0 7.1 2.0 5.1 .2 .2 16.33 192.00 21.06 19.91 .0 7.1 1.9 5.2 .2 .2 16.20 200.00 21.06 19.91 .0 7.1 1.8 5.3 .2 .2 16.07 208.00 21. 06 19.91 .0 7.1 1.7 5.4 .2 .2 15.95 216.00 21.06 19.91 .0 7.1 1.6 5.5 .2 .2 15.83 224.00 21. 06 19.91 .0 7.1 1.5 5.6 .2 .2 15.71 232.00 21.06 19.91 .0 7.1 1.4 5.7 .1 .1 15.59 240.00 21. 06 19.91 .0 7.1 1.3 5.8 .1 .1 15.48 248.00 21. 06 19.91 .0 7.1 1.2 5.9 .1 .1 15.37 256.00 21. 06 19.91 .0 7.1 1.1 6.0 .1 .1 15.26 264.00 21. 06 19.91 .0 7.1 1.0 6.1 .1 .1 15.16 272.00 21.06 19.91 .0 7.1 .9 6.2 .1 .1 15.05 280.00 21.06 19.91 .0 7.1 .8 6.3 .1 .1 14.95 288.00 21.06 19.91 .0 7.1 .7 6.4 .1 .1 14.86 296.00 21.06 19.91 .0 7.1 .7 6.4 .1 .1 14.78 297.00 21.06 19.91 .0 7.1 .7 6.4 .1 .1 14.77 SUMMARY INFORMATION MAX IMUM STAGE WAS 22.06 FEET AT 64.00 HOURS MAX IMUM DISCHARGE WAS 1.7 CFS AT 64.00 HOURS S C S PROGRAM PROJECT NAME ENGINEER PROJECT AREA GROUND STORAGE TERMINATION DISCHARGE DISTRIBUTION TYPE RETURN FREQUENCY RAINFALL DURATION 24-HOUR RAINFALL REPORTING SEQUENCE . . HIGH RIDGE PROPERTIES CUNNINGHAM & DURRANCE 4.30 ACRES 1.00, INCHES .10 CFS S FWMD 100.00 YEARS 3-DAY 15.50 INCHES STANDARDIZED STAGE STORAGE (FT) (AF) 14.00 .00 15.00 .85 17.00 2.56 18.00 3.41 19.50 3.41 20.00 3.49 20.50 3.72 21.00 4.11 22.00 5.34 23.00 7.18 DISCHARGE (CFS) .00 .00 .00 .21 .00 .00 .00 .00 .00 .00 - - - - - - R E S E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DISCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF) (CFS) (CFS) (FT) .00 .00 .00 .0 .0 .0 .0 .0 .0 14.00 4.00 .38 .03 .1 .0 .0 .0 .0 .0 14.01 8.00 .75 .20 .2 .1 .1 .0 .0 .0 14.08 12.00 1.13 .45 .3 .2 .2 .0 .0 .0 14.19 16.00 1. 51 .74 .3 .3 .3 .0 .0 .0 14.31 20.00 1. 89 1. 06 .4 .4 .4 .0 .0 .0 14 .44 24.00 2.26 1.39 .4 .5 .5 .0 .0 .0 14.58 28.00 2.81 1. 89 .6 .7 .7 .0 .0 .0 14.79 32.00 3.36 2.40 .6 .9 .9 .0 .0 .0 15.01 36.00 3.91 2.93 .6 1.0 1.0 .0 .0 .0 15.23 40.00 4.46 3.45 .6 1.2 1.2 .0 .0 .0 15.45 44.00 5.01 3.99 .6 1.4 1.4 .0 .0 .0 15.67 48.00 5.56 4.52 .6 1.6 1.6 .0 .0 .0 15.89 52.00 6.26 5.20 .9 1.9 1.9 .0 .0 .0 16.18 56.00 7.69 6.61 2.0 2.4 2.4 .0 .0 .0 16.75 58.00 8.87 7.77 2.9 2.8 2.8 .0 .0 .0 17.23 59.00 9.73 8.63 4.3 3.1 3.1 .0 .1 . .i 17.56 59.50 10.51 9.40 6.7 3.4 3.4 .0 .2 .1 17.85 - - - - - - RES E R V 0 I R - - RAIN ACCUM. BASIN ACCUM. ACCUM. INSTANT AVERAGE TIME FALL RUNOFF DISCHGE INFLOW VOLUME OUTFLOW DISCHGE DISCHGE STAGE (HR) (IN) (IN) (CFS) (AF) (AF) (AF)' (CFS) (CFS) (FT) 59.75 12.83 11.71 40.1 4.2 4.2 .0 .0 , 20.56 . -'- ... 60.00 15.73 14.59 50.0 5.2 5.2 .0 .0 .0 21. 48 60.50 16.86 15.72 9.8 5.6 5.6 .0 .0 .0 22.10 61. 00 17.45 16.31 5.1 5.8 5.8 .0 .0 .0 22.24 62.00 18.24 17.10 3.1 6.1 6.1 .0 .0 .0 22.40 64.00 19.20 18.05 .2.0 6.5 6.5 .0 .0 .0 22.59 68.00 20.32 19.17 1.2 6.9 6.9 .0 .0 . C 22.82 72.00 21. 06 19.91 .8 7.1 7.1 .0 .0 .0 22.96 SUMMARY INFORMATION MAX I MUM STAGE WAS 22.96 FEET AT 72.00 HOURS MAX I MUM DISCHARGE WAS .2 CFS AT 59.50 HOURS Water Management Computations for HIGH RIDGE PROPERTIES at 2900 HIGH RIDGE ROAD, BOYNTON BEACH, FLORIDA November 8, 1999 .. ~ Site Data Impervious Area Building Parking 71,454 S. F. 85,680 S. F. 38% 46% Total Impervious 157,134 S. F. 84% Pervious Area Retention Area Open Space 3,490 S. F. 26,863 S. F. 2% 14% Total Pervious 30,353 S. F. 16% Total Area 187,487 S. F. 100% Drainage Computations A. . Criteria: Design system to retain the first inch of runoff, or the runoff from a three year, one hour rainfall, which ever is greater. 1 . Compute the first inch of Runoff 187,487 S.F. x 1" = 15,624 C. F. 2. Compute the runoff from a three year - one hour rainfall. Volume = Q= C= A= 1= Q CIA 0.84 187,487 S. F. 2.5 inches Q= 32740 C. F. 3. 32740 C. F. > 15624 C. F., therefore use 32740 C. F. B. Compute storage available in Dry Retention Area: 1. Area @ Top = 2. Area @ Bottom = 3. Average Area 4. Top Elevation 5. Bottom Elevation 6. Depth = 7. Volume = 3,490 S. F. 150 S. F. 1,820 S. F. 19.5 Ft. NGVD 18.5 Ft. NGVD 1.0 Ft. NGVD 1820 C. F. C. Compute storage required in Exfiltration system: 1. Total Volume Required 2. Volume = 3. Volume for Exfiltration 32740 C. F. 1820 C. F. 30920 C. F. D. CALCULATE LENGTH OF EXFILTRATION TRENCH 1. 2. . 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 C = RUNOFF COEFFICIENT (RATIONAL METHOD) A = DRAINAGE AREA (ACRES) R = RAINFALL (INCHES) S = VOLUME TO BE STORED ONSITE (AC-IN) o = EQUIVALENT RETENTION VOLUME TO BE STORED (AC-IN) V = VOLUME TO BE EXFILTRATED (AC-IN) W = TRENCH WIDTH (FEET) K = HYDRAULIC CONDUCTIVITY (CFS/SQ. FT-FT HEAD) H2 = DEPTH TO WATER TABLE (FEET) DU = NON-SATURATED TRENCH DEPTH (FEET) OS = SATURATED TRENCH DEPTH (FEET) L = LENGTH OF TRENCH REQUIRED (FEET) FORMULA FOR TRENCH LENGTH OBTAINED FROM SOUTH FLORIDA WATER MANAGEMENT DISTRICT, MANAGEMENT AND STORAGE OF SURFACE WATERS, PERMIT INFORMATION MANUAL, VOLUME IV, SEPT. 1986, PAGE C-76. 99-032 (99032-DR-CALC) x 4.00 0.84 4.30 2.50 9.02 0.50 8.52 5.50 8.34E-05 9.50 4.00 0.00 686 Water Management Computations for HIGH RIDGE PROPERTIES at 2900 HIGH RIDGE ROAD, BOYNTON BEACH, FLORIDA November 8, 1999 Site Data Impervious Area Building Parking Walks 71,454 S. F. 85,680 S. F. OS. F. 38% 46% 0% Total Impervious 157,134 S. F. 84% Pervious Area Retention Area Open Space 3,490 S. F. 26,863 S. F. 2% 14% Total Pervious 30,353 S. F. 16% Total Area 187,487 S. F. 100% Drainage Computations A. Criteria: Design system to retain the first inch of runoff, or the runoff from a ten year, one hour rainfall, which ever is greater. 1. Compute the first inch of Runoff 187,487 S.F. x 1" = 15,624 C. F. 2. Compute the runoff from a ten year - one hour rainfall. Volume = Q= C= A= 1= Q CIA 0.84 187,487 S. F. 3.6 inches Q= 47140 C. F. 3. 47140 C. F. > 15624 C. F., therefore use 47140 C. F. B. Compute storage available in Dry Retention Area: 1. Area @Top= 2. Area @ Bottom = 3. Average Area 4. Top Elevation 5. Bottom Elevation 6. Depth = 7. Volume = 3,490 S. F. 150 S. F. 1,829 S. F. 19.5 Ft. NGVD 18.5 Ft. NGVD 1.0 Ft. NGVD 1820 C. F. C. Compute storage required in Exfiltration system: 1. Total Volume Required 2. Volume = 3. Volume for Exfiltration 47140 C. F. 1820 C. F. 45320 C. F. D. CALCULATE LENGTH OF EXFILTRATION TRENCH 1. 2. , 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 C = RUNOFF COEFFICIENT (RATIONAL METHOD) A = DRAINAGE AREA (ACRES) R = RAINFALL (INCHES) S = VOLUME TO BE STORED ONSITE (AC-IN) o = EQUIVALENT RETENTION VOLUME TO BE STORED (AC-IN) V = VOLUME TO BE EXFIL TRATED (AC-IN) W = TRENCH WIDTH (FEET) K = HYDRAULIC CONDUCTIVITY (CFS/SQ. FT-FT HEAD) H2 = DEPTH TO WATER TABLE (FEET) DU = NON-SATURATED TRENCH DEPTH (FEET) OS = SATURATED TRENCH DEPTH (FEET) L = LENGTH OF TRENCH REQUIRED (FEET) Volume Stored in trench (Ac.ln.) Volume EXFIL TRATED in trench (Ac.ln.) Hourly Discharge Rate after Reducing Volume by 50% for dry retention system Credit & using a safety factor of 2 in the SFWMD formula (AC. IN. I Day) Discharge Rate (CFS) FLORIDA WATER MANAGEMENT DISTRICT, MANAGEMENT AND STORAGE OF SURFACE WATERS, PERMIT INFORMATION MANUAL, VOLUME IV, SEPT. 1986, PAGE C-76. 99-032 (99032-DR-CALC) x 4.00 0.84 4.30 3.60 12.99 0.50 12.48 5.50 8,34E-05 9.50 4.00 0.00 1005 3.075 9.410 4.705 0.198 E. CALCULATE DISCHARGE STAGES OF EXFILTRATION TRENCH 1. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 x 3.00 2. W = TRENCH WIDTH (FEET) 5.50 3. K = HYDRAULIC CONDUCTIVllY (CFS/SQ. FT-FT HEAD) 8. 34E-05 4. DU = NON-SATURATED TRENCH DEPTH (FEET) 3.00 5. DS = SATURATED TRENCH DEPTH (FEET) 0.00 6. L = LENGTH OF TRENCH (FEET) 1005 7. V = VOLUME (AC-IN) 10.71 8. Volume Stored in trench (Ac.ln.) 2.306 9. Volume EXFIL TRATED in trench (Ac.ln.) 8.404 10. Hourly Discharge Rate after Reducing Volume by 50% for dry retention system Credit & using a safety factor of 2 in the' SFWMD formula (AC. IN. I Day) 4.202 11. Discharge Rate (CFS) 0.177 12. Elevation (Ft. N.G.V.D.) 17.00 1. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 x 2.00 2. W = TRENCH WIDTH (FEET) 5.50 3. K = HYDRAULIC CONDUCTIVllY (CFS/SQ. FT-FT HEAD) 8. 34E-05 4. DU = NON-SATURATED TRENCH DEPTH (FEET) 2.00 5. DS = SATURATED TRENCH DEPTH (FEET) 0.00 6. L = LENGTH OF TRENCH (FEET) 1005 7. V = VOLUME (AC-IN) 8.77 8. Volume Stored in trench (Ac.ln.) 1.537 9. Volume EXFIL TRATED in trench (Ac.ln.) 7.231 10. Hourly Discharge Rate after Reducing Volume by 50% for dry retention system Credit & using a safety factor of 2 in the SFWMD formula (AC. IN. I Day) 3.615 11. Discharge Rate (CFS) 0.152 12. Elevation (Ft. N.G.V.D.) 16.00 1. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 x 1.00 2. W = TRENCH WIDTH (FEET) 5.50 3. K = HYDRAULIC CONDUCTIVllY (CFS/SQ. FT-FT HEAD) 8. 34E-05 4. DU = NON-SA TURA TED TRENCH DEPTH (FEET) 1.00 5. DS = SATURATED TRENCH DEPTH (FEET) 0.00 6. L = LENGTH OF TRENCH (FEET) 1005 7. V = VOLUME (AC-IN) 6.66 8. Volume Stored in trench (Ac.ln.) 0.769 9. Volume EXFIL TRATED in trench (Ac.ln.) 5.889 10. Hourly Discharge Rate after Reducing Volume by 50% for dry retention system Credit & using a safety factor of 2 in the SFWMD formula (AC. IN. I Day) 2.945 11. Discharge Rate (CFS) 0.124 12. Elevation (Ft. N.G.V.D.) 15.00 1. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 x 0.00 2. W = TRENCH WIDTH (FEET) 5.50 3. K = HYDRAULIC CONDUCTIVITY (CFS{Sa. FT-FT HEAD) 8. 34E-05 4. DU = NON-SATURATED TRENCH DEPTH (FEET) 0.00 5. OS = SATURATED TRENCH DEPTH (FEET) 0.00 6. L = LENGTH OF TRENCH (FEET) 1005 7. V = VOLUME (AC-IN) 4.38 8. Volume Stored in trench (Ac.ln.) 0.000 9. Volume EXFIL TRATED in trench (Ac.ln.) 4.380 10. Hourly Discharge Rate after Reducing Volume by 50% for dry retention system Credit & using a safety factor of 2 in the SFWMD formula (AC. IN. I Day) 2.190 11. Discharge Rate (CFS) 0.092 12. Elevation (Ft. N.G.V.D.) 14.00 1. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 x 4.00 2. W = TRENCH WIDTH (FEET) 5.50 3. K = HYDRAULIC CONDUCTIVITY (CFS/Sa. FT-FT HEAD) 8. 34E-05 4. H2 = DEPTH TO WATER TABLE (FEET) 10.00 5. DU = NON-SA TURA TED TRENCH DEPTH (FEET) 4.00 6. DS = SATURATED TRENCH DEPTH (FEET) 0.00 7. L = LENGTH OF TRENCH (FEET) 1005 8. V = VOLUME (AC-IN) 13.05 9. Volume Stored in trench (Ac.ln.) 3.075 10. Volume EXFIL TRATED in trench (Ac.ln.) 9.976 11. Hourly Discharge Rate after Reducing Volume by 50% for dry retention system Credit & using a safety factor of 2 in the SFWMD formula (AC. IN. I Day) 4.988 12. Discharge Rate (CFS) 0.210 13. Elevation (Ft. N.G.V.D.) 20.00 1. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 x 4.00 2. W = TRENCH WIDTH (FEET) 5.50 3. K = HYDRAULIC CONDUCTIVITY (CFS/Sa. FT-FT HEAD) 8. 34E-05 4. H2 = DEPTH TO WATER TABLE (FEET) 11.00 5. DU = NON-SATURATED TRENCH DEPTH (FEET) 4.00 6. OS = SATURATED TRENCH DEPTH (FEET) 0.00 7. L = LENGTH OF TRENCH (FEET) 1005 8. V = VOLUME (AC-IN) 14.18 9. Volume Stored in trench (Ac.ln.) 3.075 10. Volume EXFIL TRATED in trench (Ac.ln.) 11 . 1 08 11. Hourly Discharge Rate after Reducing Volume by 50% for dry retention system Credit & using a safety factor of 2 in the SFWMD formula (AC. IN. I Day) 5.554 12. Discharge Rate (CFS) 0.233 13. Elevation (Ft. N.G.V.D.) 20.50 1. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 x 4.00 2. W = TRENCH WIDTH (FEET) 5.50 3. K = HYDRAULIC CONDUCTIVITY (CFS/SQ. FT-FT HEAD) 8. 34E..o5 u 4. H2 = DEPTH TO WATER TABLE (FEET) 12.00 5. DU = NON-SA TURA TED TRENCH DEPTH (FEET) 4.00 6. OS = SATURATED TRENCH DEPTH (FEET) 0.00 7. L = LENGTH OF TRENCH (FEET) 1005 8. V = VOLUME (AC-IN) 15.31 9. Volume Stored in trench (Ac.ln.) 3.075 10. Volume EXFIL TRATED in trench (Ac.ln.) 12.240 11. Hourly Discharge Rate after Reducing Volume by 50% for dry retention system Credit & using a safety factor of 2 in the SFWMD formula (AC. IN. I Day) 6.120 12. Discharge Rate (CFS) 0.257 13. Elevation (Ft. N.G.v.D.) 21.00 1. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 x 4.00 . 2. W = TRENCH WIDTH (FEET) 5.50 3. K = HYDRAULIC CONDUCTIVITY (CFS/SQ. FT-FT HEAD) 8. 34E..o5 4. H2 = DEPTH TO WATER TABLE (FEET) 13.00 5. DU = NON-SATURATED TRENCH DEPTH (FEET) 4.00 6. OS = SATURATED TRENCH DEPTH (FEET) 0.00 7. L = LENGTH OF TRENCH (FEET) 1005 8. V = VOLUME (AC-IN) 16.45 9. Volume Stored in trench (Ac.ln.) 3.075 10. Volume EXFIL TRATED in trench (Ac.ln.) 13.371 11. Hourly Discharge Rate after Reducing Volume by 50% for dry retention system Credit & using a safety factor of 2 in the SFWMD formula (AC. IN. / Day) 6.686 12. Discharge Rate (CFS) 0.281 13. Elevation (Ft. N.G.V.D.) 22.00 1. TRENCH DIMENSIONS (WIDTH X DEPTH) (FEET) 5.50 x 4.00 2. W = TRENCH WIDTH (FEET) 5.50 3. K = HYDRAULIC CONDUCTIVITY (CFS/SQ. FT-FT HEAD) 8. 34E..o5 4. H2 = DEPTH TO WATER TABLE (FEET) 14.00 5. OU = NON-SATURATED TRENCH DEPTH (FEET) 4.00 6. OS = SATURATED TRENCH DEPTH (FEET) 0.00 7. L = LENGTH OF TRENCH (FEET) 1005 8. V = VOLUME (AC-IN) 17.58 9. Volume Stored in trench (Ac.ln.) 3.075 10. Volume EXFIL TRATED in trench (Ac.ln.) 14.503 11. Hourly Discharge Rate after Reducing Volume by 50% for dry retention system Credit & using a safety factor of 2 in the SFWMD formula (AC. IN. I Day) 7.252 12. Discharge Rate (CFS) 13. Elevation (Ft. N.G.V.D.) 0.305 23.00 .il