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HomeMy WebLinkAboutStormwater Report - 1789 GREAT POND ROAD 6/21/1999 & ATLANTIC E NGINEERING SURVEY CONSULTANTS, INC. Land Surveyors Civil Engineers Planners MRINED r7r , NC)RTH ANDOVER JU 1999 PLANNING C)EPARTMENT Hydrologic Report CONSERV'AT NGOW IA SON 4V for LOT A - GREAT POND ROAD CONTEMPORARY BUILDERS NORTH ANDOVER. MASSACHUSETTS 114 OF MARTIN M. 3F KALLERAN 33968 T Ann 2, 10& 10O Year Storm 24 Hour Duration Date:May 5, 1999 Revised: June 18, 1999 97 Tenney Street—Suite 5— Georgetown,MA 01833 (978) 352-7870 — (978) 948-7677 FAX — (978) 352-9940 AssuMptions: The following assumptions are being used for design purposes: 1) Annual, 2, 10& 100 year storm frequency. 2) 24 hour storm duration (min.) 4) Hydrologic soils groups for the run-off areas are classified "C"soil groups under U.S.D.A. Soil Conservation Service guidelines 5) The property lines are considered the design point for the hydraulic calculations Sub-catchment 4 will remain the same pre and post and as such will be excluded from this study.. Design Criteria: 1) Run-off quantities are calculated using TR-20 2) I=2.3 for Annual/24 hr. duration, 3.2 12yr., 4.8 i&110 yr. & 7.0 in✓100 yr. 3) Cn = 70 for undisturbed areas, 74 for grassed or landscaped areas, and 98 for impervious areas 4) Hyetrograph shape=S.C.S.III(eastern U.S.) 5) The maximum flow rate and total volume of run-off for the Annual, 2,& 10 yr. design storms which are routed thru drainage system will not exceed preconstruction conditions 7) The first 114 inch of run-off(MIA9 from the proposed impervious surfaces will be re-infiltrated on site. (9100£f*114"=190 CF req. :225 CFprovided in sump) TECHNICAL APPENDIX PRE-DEVELOPMENT Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 2.30 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems WATERSHED ROUTING =----------------------------------------------------- ------ < i> OSUBCATCHMENT Q REACH Q POND LINK SUBCATCHMENT 1 = EXISTING LOT -> Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 2.30 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 6.01 001066 (c) 1986-1998 Applied Microcomputer Systems RUNOFF BY SCS TR-20 METHOD: TYPE III 24-HOUR RAINFALL= 2.30 IN, SCS U.H. RUNOFF SPAN = 4-18 HRS, dt= .03 HRS, 468 POINTS SUBCAT AREA Tc WGT'D PEAK Tpeak VOL NUMBER (ACRE) (MIN) --GROUND COVERS (%CN)-- CN C (CFS) (HRS) (AF) 1 1 .28 4.4 40%74 5%98 55%70 73 - .59 12.07 .04 Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 2.30 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 1 EXISTING LOT PEAK= .59 CFS @ 12.07 HRS, VOLUME= .04 AF PERCENT CN SCS TR-20 METHOD 40.00 74 CLEARED LAND GOOD CONDITION TYPE III 24-HOUR 5.00 98 EXIST. DRIVEWAY RAINFALL= 2.30 IN 55.00 70 UNDISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS 100.00 73 TOTAL AREA = 1 .28 AC Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 3.5 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.46 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .9 Unpaved Kv=16. 1345 L=329' s=. 142 '/' V=6.08 fps Total Length= 379 ft Total Tc= 4.4 SUBCATCHMENT 1 RUNOFF EXISTING LOT .55 AREA= 1 .28 AC ,50 Tc= 4. 4 MIN CN= 73 .45 . . ,4e SCS TR-20 METHOD + 35 TYPE III 24-HOUR U RAINFALL= 2. 30 IN . '30 - 25 PEAK= .59 CFS 0 .20 UOLUME= . 04 AF J LL . 1 5 . 10 .05 (3 .0 0v d5 � i- ao m m - cv m v u-) ko o0 TIME Choursa Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 3.20 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems WATERSHED ROUTING ------------------------------------------------------------- 1 OSUBCATCHMENT E-1 REACH POND LINK SUBCATCHMENT 1 = EXISTING LOT -> Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 3.20 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems RUNOFF BY SCS TR-20 METHOD: TYPE III 24-HOUR RAINFALL= 3.20 IN, SCS U.H. RUNOFF SPAN = 4-18 HRS, dt= .03 HRS, 468 POINTS SUBCAT AREA Tc WGT'D PEAK Tpeak VOL NUMBER (ACRE) (MIN) --GROUND COVERS (%CN)-- CN C (CFS) (HRS) (AF) 1 1 .28 4.4 40%74 5%98 55%70 73 - 1 .45 12,06 .09 Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 3.20 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 1 EXISTING LOT PEAK= 1 .45 CFS @ 12.06 HRS, VOLUME= .09 AF PERCENT CN SCS TR-20 METHOD 40.00 74 CLEARED LAND GOOD CONDITION TYPE III 24-HOUR 5.00 98 EXIST. DRIVEWAY RAINFALL= 3.20 IN 55.00 70 UNDISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS 100.00 73 TOTAL AREA = 1 .28 AC Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 3.5 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.46 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .9 Unpaved Kv=16.1345 L=329' s=. 142 '/' V=6.08 fps Total Length= 379 ft Total Tc= 4.4 SUBCATCHMENT 1 RUNOFF EXISTING LOT 1 .4 1 .3 AREA= 1 .2B AC 1 2 Tc= 4. 4 MIN CN= 73 it 1 .8 SCS TR-20 METHOD 9 TYPE III 24-HOUR u B RAINFALL= 3. 20 IN v 7 6 PEAK= 1 .45 CFS a 5 e 12 .06 HRS VOLUME= 0, AF ti .4 2 . 1 TIME Choura7 Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 4.80 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems WATERSHED ROUTING =--------------=---=----------------------------------------- ----------------------------------- 1 SUBCATCHMENT a REACH POND LINK SUBCATCHMENT 1 = EXISTING LOT -> Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 4.80 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 5 01 001066 (c) 1886-1998 Applied Microcomputer Systems RUNOFF BY SCS TR-20 METHOD: TYPE III 24-HOUR RAINFALL= 4.80 IN, SCS U.N. RUNOFF SPAN = 4-18 HRS, dt= .03 HRS, 468 POINTS SUBCAT AREA Tc WGT'D PEAK Tpeak VOL NUMBER (ACRE) (MIN) --GROUND COVERS (%CN)-- CN C (CFS) (HRS) (AF) 1 1 .28 4.4 40%74 5%98 55%70 73 - 3.32 12.05 .20 Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 4.80 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HYdroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 1 EXISTING LOT PEAK= 3.32 CFS @ 12.05 HRS, VOLUME= .20 AF PERCENT CN SCS TR-20 METHOD 40.00 74 CLEARED LAND GOOD CONDITION TYPE III 24-HOUR 5.00 98 EXIST. DRIVEWAY RAINFALL= 4.80 IN 55.00 70 UNDISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS 100.00 73 TOTAL AREA = 1 .28 AC Method Comment Tc (min) TR-55 SHEET FLOW ^SHEET FLOW 3.5 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.46 '/' SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .9 Unpaved Kv=16. 1345 L=329' s=. 142 '/' V=6.08 fps Total Length= 379 ft Total Tc= 4.4 SUBCATCHMENT 1 RUNOFF EXISTING LOT 3 .2 3 ,0 AREA= 1 .28 AC 2 .8 - Tc= 4. 4 MIN 2 .6 - CN= 73 2 '4 SCS TR-20 METHOD 2 '2 TYPE III 24-HOUR LO C'' �` '6 RAINFALL= 4. 80 IN U 1 .$ 1 '6 PEAK= 3 .32 CFS CD 1 2 e 12 .05 HRS 1 1 ,0 VOLUME= . 20 AF Lj- B .6 .4 2 0 .0 TIME (hour-s) Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 7.00 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems WATERSHEDROUTING ---------- ------------------------------------------------ 1 C)SURCATCHMENT El REACH POND LINK SUBCATCHMENT 1 = EXISTING LOT -> Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 7.00 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems RUNOFF BY SCS TR-20 METHOD: TYPE III 24-HOUR RAINFALL= 7.00 IN, SCS U.H. RUNOFF SPAN = 4-18 HRS, dt= .03 HRS, 468 POINTS SUBCAT AREA Tc WGT'D PEAK Tpeak VOL NUMBER (ACRE) (MIN) --GROUND COVERS (%CN)-- CN C (CFS) (HRS) (AF) 1 1 .28 4.4 40%74 5%98 55%70 73 - 6.22 12.05 .37 Data for GREATPOND EXIST. TYPE III 24-HOUR RAINFALL= 7.00 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 11 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 1 EXISTING LOT PEAK= 6.22 CFS @ 12.05 HRS, VOLUME= .37 AF PERCENT CN SCS TR-20 METHOD 40.00 74 CLEARED LAND GOOD CONDITION TYPE III 24-HOUR 5.00 98 EXIST. DRIVEWAY RAINFALL= 7.00 IN 55.00 70 UNDISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS 100.00 73 TOTAL AREA = 1 .28 AC Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 3.5 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.46 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .9 Unpaved Kv=18.1345 L=329' s=.142 '/' V=6.08 fps Total Length= 379 ft Total Tc= 4.4 SUBCATCHMENT 1 RUNOFF EXISTING LOT 6 .0 5 .5 AREA= 1 .26 AC T== 4. 4 MIN 5 ,0 CN= 73 4 .5 SC5 TR-20 METHOD 4 .8 TYPE III 24-HOUR u 3 .5 RAINFALL= 7. 00 IN 2 ,5 PEAK= 6 .22 CFS e 12 .05 HRS CD 2 .8 VOLUME= . 37 AF 1 .0 .5 0 ,0� in r- OD rn m - cv rn in .n r ao TIME Chours� PaST DE T EL 4PMENT Data for GREATPOND B TYPE III 24-,HOUR RAINFALL= 2.30 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems WATERSHED ROUTING ----- - ----------------------------------------------------- 0 O O CDSUBCATCHMENT a REACH POND LLNK SUBCATCHMENT 1 = SUB1 -> POND 2 SUBCATCHMENT 2 = SUB2 -> POND 1 SUBCATCHMENT 3 = SUB3 -> POND 2 POND 1 = DETENSION BASIN -> POND 2 POND 2 = -> Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 2.30 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems RUNOFF BY SCS TR-20 METHOD: TYPE III 24-HOUR RAINFALL= 2.30 IN, SCS U.H. RUNOFF SPAN = 4-18 HRS, dt= .03 HRS, 468 POINTS SUBCAT AREA Tc WGT'D PEAK Tpeak VOL NUMBER (ACRE) (MIN) --GROUND COVERS (%CN)-- CN C (CFS) (HRS) (AF) 1 .52 4.4 8%98 2%98 10%74 81%70 73 - .24 12.07 .02 2 .57 4. 1 49%74 11%98 7%98 5%98 78 - .43 12.06 .03 28%70 3 . 19 5.5 21%98 5%98 5%74 68%70 78 - .14 12.08 .01 Data for GREATPOND S TYPE III 24-HOUR RAINFALL= 2.30 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems POND ROUTING BY STOR-IND METHOD POND START FLOOD PEAK PEAK ------ PEAK FLOW ------- ---Qout--- NO. ELEV. ELEV. ELEV. STORAGE Qin Qout Qpri Qsec ATTEN. LAG (FT) (FT) (FT) (AF) (CFS) (CFS) (CFS) (CFS) (%) (MIN) 1 134.0 136.5 134.8 .01 .43 .04 .04 0.00 90 88.5 2 0.0 0.0 0.0 0.00 .38 .38 0 0.0 N Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 2.30 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 1 SUB1 PEAK= .24 CFS @ 12.07 HRS, VOLUME= .02 AF ACRES CN SCS TR-20 METHOD .04 98 PAVED TYPE III 24-HOUR .01 98 HOUSE RAINFALL= 2.30 IN .05 74 DISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS .42 70 UNDISTURBED AREA .52 73 Method Comment _ Tc (min) TR-55 SHEET FLOW SHEET FLOW 4. 1 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.32 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND .3 Unpaved Kv=16.1345 L=142' s=.2 '/' V=7.22 fps Total Length= 192 ft Total Tc= 4.4 SUBCATCHMENT 2 SUB2 PEAK= .43 CFS @ 12.06 HRS, VOLUME= .03 AF ACRES CN SCS TR-20 METHOD .28 74 DISTURBED AREA TYPE III 24-HOUR .06 98 PAVED RAINFALL= 2.30 IN .04 98 BASIN SPAN= 4-18 HRS, dt=.03 HRS .03 98 HOUSE . 16 70 UNDISTURBED AREA .57 78 Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 3.5 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.46 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .6 Unpaved Kv=16. 1345 L=234' s=. 15 '/' V=6.25 fps Total Length= 284 ft Total Tc= 4.1 Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 2.30 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 901066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 3 SUB3 PEAK= . 14 CFS @ 12.08 HRS, VOLUME= .01 AF ACRES CN SCS TR-20 METHOD .04 98 EXISTING DRIVEWAY TYPE III 24-HOUR .01 98 PROP. DRIVEWAY RAINFALL= 2.30 IN .01 74 DISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS . 13 70 UNDISTURBED AREA . 19 78 Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 4.7 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.22 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .4 Unpaved Kv=16. 1345 L=113' s=.07 '/' V=4.27 fps SHALLOW CONCENTRATED/UPLAND FLOW SHALLOW FLOW .4 Paved Kv=20.3282 L=128' s=.07 '/' V=5.38 fps Total Length= 291 ft Total Tc= 5.5 Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 2.30 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems POND 1 DETENSION BASIN Qin = .43 CFS @ 12.06 HRS, VOLUME= .03 AF Qout= .04 CFS @ 13.53 HRS, VOLUME= .01 AF, ATTEN= 90%, LAG= 88.5 MIN Qpri= .04 CFS @ 13.53 HRS, VOLUME= .01 AF Qsec= 0.00 CFS @ 13.53 HRS, VOLUME= 0.00 AF ELEVATION AREA INC.STOR CUM.STOR STOR-IND METHOD (FT) (SF) (CF) (CF) PEAK STORAGE = 619 CF 134.0 428 0 0 PEAK ELEVATION= 134.8 FT 136.0 1050 1478 1478 FLOOD ELEVATION= 136.5 FT 136.5 1483 633 2111 START ELEVATION= 134.0 FT SPAN= 4-18 HRS, dt=.03 HRS 4 x FINER ROUTING Tdet= 159 MIN ( .01 AF) _# ROUTE INVERT OUTLET DEVICES 1 S 0.0' EXFILTRATION V= .0001 FPM over SURFACE AREA 2 P 136.0' 2.5' BROAD-CRESTED RECTANGULAR WEIR X 1.81 Q=C L H"1 .5 C=1 .95, 1 .98, 0, 0, 0, 0, 0, 0 3 P 134.6' 2" CULVERT n=.011 L=50 ' S=. 11/' Ke=.5 Cc=.9 Cd=.6 Primary Discharge _2=Broad-Crested Rectangular Weir 3=Culvert Secondary Discharge I 1=ExfiItration POND 2 Not described Qin = .38 CFS @ 12.07 HRS, VOLUME= .04 AF Qout= .38 CFS @ 12.07 HRS, VOLUME= .04 AF, ATTEN= 0%, LAG= 0.0 MIN ELEVATION AREA INC.STOR CUM-.STOR - METHOD (FT) (AC) (AF) (AF) PEAK STORAGE = 0.00 AF PEAK ELEVATION= 0.0 FT FLOOD ELEVATION= 0.0 FT START ELEVATION= 0.0 FT SPAN= 4-18 HRS, dt=.03 HRS # ROUTE INVERT OUTLET DEVICES Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 3.20 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) .1986-1998 Applied Microcomputer Systems WATERSHEDROUTING ---------------------------------------------------�__----- O O O OSUBCATCHMENT F-1 REACH POND LINK SUBCATCHMENT 1 = SUB1 -> POND 2 SUBCATCHMENT 2 = SUB2 -> POND 1 SUBCATCHMENT 3 = SUB3 -> POND 2 POND 1 = DETENSION BASIN -> POND 2 POND 2 - -> Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 3.20 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems RUNOFF BY SCS TR-20 METHOD: TYPE III 24-HOUR RAINFALL= 3.20 IN, SCS U.H. RUNOFF SPAN = 4-18 HRS, dt= .03 HRS, 468 POINTS SUBCAT AREA Tc WGT'D PEAK Tpeak VOL NUMBER (ACRE) (MIN) --GROUND COVERS (%CN)-- CN C (CFS) (HRS) (AF) 1 .52 4.4 8%98 2%98 10%74 81%70 73 - .59 12.06 .04 2 .57 4.1 49%74 11%98 7%98 5%98 78 - .89 12.05 .05 28%70 3 . 19 5.5 21%98 5%98 5%74 68%70 78 - .28 12.07 .02 Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 3.20 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems POND ROUTING BY STOR-IND METHOD POND START FLOOD PEAK PEAK ------ PEAK FLOW ------- ---Qout--- NO. ELEV. ELEV. ELEV. STORAGE Qin Qout Qpri Qsec ATTEN. LAG (FT) (FT) (FT) (AF) (CFS) (CFS) (CFS) (CFS) (%) (MIN) 1 134.0 136,5 135.6 .03 .89 . 10 . 10 0.00 89 50.3 2 0.0 0.0 0.0 0.00 .91 .91 0 0.0 N Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 3.20 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HvdroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 1 SUB1 PEAK= .59 CFS @ 12.06 HRS, VOLUME= .04 AF ACRES CN SCS TR-20 METHOD .04 98 PAVED TYPE III 24-HOUR .01 98 HOUSE RAINFALL= 3.20 IN .05 74 DISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS .42 70 UNDISTURBED AREA .52 73 Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 4. 1 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.32 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND .3 Unpaved Kv=16. 1345 L=142 ' s=.2 '/' V=7.22 fps Total Length= 192 ft Total Tc= 4.4 SUBCATCHMENT 2 SUB2 PEAK= .89 CFS @ 12.05 HRS, VOLUME= .05 AF ACRES CN SCS TR-20 METHOD .28 74 DISTURBED AREA TYPE III 24-HOUR .06 98 PAVED RAINFALL= 3.20 IN .04 98 BASIN SPAN= 4-18 HRS, dt=.03 HRS .03 98 HOUSE . 16 70 UNDISTURBED AREA .57 78 Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 3.5 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.46 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .6 Unpaved Kv=16. 1345 L=234' s=. 15 '/' V=6.25 fps Total Length= 284 ft Total Tc= 4.1 Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 3.20 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 3 SUB3 PEAK= .28 CFS @ 12.07 HRS, VOLUME= .02 AF ACRES CN SCS TR-20 METHOD .04 98 EXISTING DRIVEWAY TYPE III 24-HOUR .01 98 PROP. DRIVEWAY RAINFALL= 3.20 IN .01 74 DISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS . 13 70 UNDISTURBED AREA . 19 78 Method _ Comment_ Tc (min) TR-55 SHEET FLOW SHEET FLOW 4.7 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.22 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .4 Unpaved Kv=16. 1345 L=113' s=.07 '/' V=4.27 fps SHALLOW CONCENTRATED/UPLAND FLOW SHALLOW FLOW .4 Paved Kv=20.3282 L=128' s=.07 '/' V=5.38 fps Total Length= 291 ft Total Tc= 5.5 Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 3.20 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001.066 (c) 1986-1998 Applied Microcomputer Systems POND 1 DETENSION BASIN Qin = .89 CFS @ 12.05 HRS, VOLUME= .05 AF Qout= . 10 CFS @ 12.89 HRS, VOLUME= .04 AF, ATTEN= 89%, LAG= 50.3 MIN Qpri= .10 CFS @ 12.89 HRS, VOLUME= .04 AF Qsec= 0.00 CFS @ 12.89 HRS, VOLUME= 0.00 AF ELEVATION AREA INC.STOR CUM.STOR STOR-IND METHOD _ (FT) (SF) (CF) (CF) PEAK STORAGE = 1167 CF 134.0 428 0 0 PEAK ELEVATION= 135.6 FT 136.0 1050 1478 1478 FLOOD ELEVATION= 136.5 FT 136.5 1483 633 2111 START ELEVATION= 134.0 FT SPAN= 4-18 HRS, dt=.03 HRS 4 x FINER ROUTING Tdet= 144.7 MIN ( .04 AF) # ROUTE INVERT OUTLET DEVICES 1 S 0.0' EXFILTRATION V= .0001 FPM over SURFACE AREA 2 P 136.0' 2.5' BROAD-CRESTED RECTANGULAR WEIR X 1 .81 Q=C L H"1 .5 C=1 .95, 1 .98, 0, 0, 0, 0, 0, 0 3 P 134.6' 2" CULVERT n=.011 L=50' S=. 11/' Ke=.5 Cc=.9 Cd=.6 Primary Discharge {-,-2=Broad-Crested Rectangular Weir 3=Culvert Secondary Discharge I 1=Exfiltration POND 2 Not described Qin = .91 CFS @ 12.07 HRS, VOLUME= .09 AF Qout= .91 CFS @ 12.07 HRS, VOLUME= .09 AF, ATTEN= 0%, LAG= 0.0 MIN ELEVATION AREA INC.STOR CUM•.STOR - METHOD (FT) (AC) (AF) (AF) PEAK STORAGE = 0.00 AF PEAK ELEVATION= 0.0 FT FLOOD ELEVATION= 0,0 FT START ELEVATION= 0.0 FT SPAN= 4-18 HRS, dt=.03 HRS # ROUTE JNVERT OUTLET DEVICES Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 4.80 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 uydroCAD 5 01 001066 (c) 19$6-1998 Applied Microcomputer Systems WATERSHED ROUTING O O O �2 \ SUBCATCHMENT [�:] REACH POND LINK SUBCATCHMENT 1 = SUN -> POND 2 SUBCATCHMENT 2 = SUB2 -> POND 1 SUBCATCHMENT 3 = SUB3 -> POND 2 POND 1 = DETENSION BASIN -> POND 2 POND 2 = -> Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 4.80 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems RUNOFF BY SCS TR-20 METHOD: TYPE III 24-HOUR RAINFALL= 4,80 IN, SCS U.H. RUNOFF SPAN = 4-18 HRS, dt= .03 HRS, 468 POINTS SUBCAT AREA Tc WGT'D PEAK Tpeak VOL NUMBER (ACRE) (MIN) --GROUND COVERS (%CN) CN C (CFS) (HRS) (AF) 1 .52 4.4 8%98 2%98 10%74 81%70 73 - 1 .35 12.05 .08 2 .57 4.1 49%74 11%98 7%98 5%98 78 - 1 .81 12.05 . 11 28%70 3 . 19 5.5 21%98 5%98 5%74 68%70 78 - .57 12.07 .04 Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 4.80 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems POND ROUTING BY STOR-IND METHOD POND START FLOOD PEAK PEAK ------ PEAK FLOW ------- ---QOut--- NO, ELEV. ELEV. ELEV. STORAGE Qin Qout Qpri Qsec ATTEN. LAG (FT) (FT) (FT) (AF) (CFS) (CFS) (CFS) (CFS) (%) (MIN) 1 134,0 136.5 136.2 .04 1 .81 .95 .95 0.00 47 7.3 2 0.0 0.0 0.0 0.00 2.33 2.33 0 0.0 N Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 4.80 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 3 SUBS PEAK= .57 CFS @ 12.07 HRS, VOLUME= .04 AF ACRES CN SCS TR-20 METHOD .04 98 EXISTING DRIVEWAY TYPE III 24-HOUR .01 98 PROP. DRIVEWAY RAINFALL= 4.80 IN .01 74 DISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS . 13 70 UNDISTURBED AREA .19 78 Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 4.7 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.22 '/' SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .4 Unpaved Kv=16. 1345 L=113' s=.07 '/' V=4.27 fps SHALLOW CONCENTRATED/UPLAND FLOW SHALLOW FLOW .4 Paved Kv=20.3282 L=128' s=.07 '/' V=5.38 fps Total Length= 291 ft Total Tc= 5.5 Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 4.80 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems POND 1 DETENSION BASIN Qin = 1 .81 CFS @ 12.05 HRS, VOLUME= . 11 AF Qout= .95 CFS @ 12. 17 HRS, VOLUME= .09 AF, ATTEN= 47%, LAG= 7.3 MIN Qpri= .95 CFS @ 12.17 HRS, VOLUME= .09 AF Qsec= 0.00 CFS @ 12. 17 HRS, VOLUME= 0.00 AF ELEVATION AREA INC.STOR CUM.STOR STOR-IND METHOD (FT) (SF) (CF) (CF) PEAK STORAGE = 1738 CF 134.0 428 0 0 PEAK ELEVATION= 136.2 FT 136.0 1050 1478 1478 FLOOD ELEVATION= 136.5 FT 136.5 1483 633 2111 START ELEVATION= 134.0 FT SPAN= 4-18 HRS, dt=.03 HRS 4 x FINER ROUTING Tdet= 104.5 MIN ( .09 AF) ROUTE INVERT OUTLET DEVICES 1 S 0.0' EXFILTRATION V= .0001 FPM over SURFACE AREA 2 P 136.0' 2.5' BROAD-CRESTED RECTANGULAR WEIR X 1 .81 Q=C L H"1 .5 C=1 .95, 1 .98, 0, 0, 0, 0, 0, 0 3 P 134.6' 2" CULVERT n=.011 L=50' S=. 1 '/' Ke=.5 Cc=.9 Cd=.6 Primary Discharge �2=Broad-Crested Rectangular Weir 3=Culvert Secondary Discharge I I=Exfiltration POND 2 Not described Qin = 2.33 CFS @ 12. 11 HRS, VOLUME= .20 AF Qout= 2.33 CFS @ 12.11 HRS, VOLUME= .20 AF, ATTEN= 0%, LAG= 0.0 MIN ELEVATION AREA INC.STOR CUM-.STOR - METHOD (FT) (AC) (AF) (AF) PEAK STORAGE = 0.00 AF PEAK ELEVATION= 0.0 FT FLOOD ELEVATION= 0.0 FT START ELEVATION= 0.0 FT SPAN= 4-18 HRS, dt=.03 HR$ # ROUTE INVERT OUTLET DEVICES Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 7.00 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems WATERSHED ROUTING O O O / tom OSUBCATCHMENT a REACH POND LINK SUBCATCHMENT 1 = SUB1 -> POND 2 SUBCATCHMENT 2 = SUB2 -> POND 1 SUBCATCHMENT 3 = SUB3 -> POND 2 POND 1 = DETENSION BASIN -> POND 2 POND 2 = -> Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 7.00 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems RUNOFF BY SCS TR-20 METHOD: TYPE III 24-HOUR RAINFALL= 7.00 IN, SCS U.M. RUNOFF SPAN = 4-18 HRS, dt= .03 HRS, 468 POINTS SUBCAT AREA Tc WGT'D PEAK Tpeak VOL NUMBER (ACRE) (MIN) --GROUND COVERS (%CN)-- CN C (CFS) (HRS) (AF) 1 .52 4.4 8%98 2%98 10%74 81%70 73 - 2.53 12.05 . 15 2 .57 4. 1 49%74 11%98 7%98 5%98 78 - 3. 17 12.05 .19 28%70 3 . 19 5.5 21%98 5%98 5%74 68%70 78 - 1 .00 12.07 .06 Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 7.00 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems POND ROUTING BY STOR-IND METHOD POND START FLOOD PEAK PEAK ------ PEAK FLOW ------- ---Qout--- NO. ELEV. ELEV. ELEV. STORAGE Qin Qout Qpri Qsec ATTEN. LAG (FT) (FT) (FT) (AF) (CFS) (CFS) (CFS) (CFS) (%) (MIN) 1 134.0 136.5 136.4 .05 3. 17 2.81 2.80 0.00 11 2.2 2 0.0 0.0 0.0 0.00 6.22 6.22 0 0.0 N Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 7.00 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5 01 001066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 1 SUB1 PEAK= 2.53 CFS @ 12.05 HRS, VOLUME= . 15 AF ACRES CN SCS TR-20 METHOD .04 98 PAVED TYPE III 24-HOUR .01 98 HOUSE RAINFALL= 7.00 IN .05 74 DISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS .42 70 UNDISTURBED AREA .52 73 Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 4. 1 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.32 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND .3 Unpaved Kv=16. 1345 L=142' s=.2 '/' V=7.22 fps Total Length= 192 ft Total Tc= 4.4 SUBCATCHMENT 2 SUB2 PEAK= 3. 17 CFS @ 12.05 HRS, VOLUME= .19 AF ACRES CN SCS TR-20 METHOD .28 74 DISTURBED AREA TYPE III 24-HOUR .06 98 PAVED RAINFALL= 7.00 IN .04 98 BASIN SPAN= 4-18 HRS, dt=.03 HRS .03 98 HOUSE . 16 70 UNDISTURBED AREA .57 78 Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 3.5 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.46 SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .6 Unpaved Kv=16. 1345 L=234' s=. 15 '/' V=6.25 fps ---------- Total Length= 284 ft Total Tc= 4.1 Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 7.00 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems SUBCATCHMENT 3 SUB3 PEAK= 1 .00 CFS @ 12.07 HRS, VOLUME= .06 AF ACRES CN SCS TR-20 METHOD .04 98 EXISTING DRIVEWAY TYPE III 24-HOUR .01 98 PROP. DRIVEWAY RAINFALL= 7.00 IN .01 74 DISTURBED AREA SPAN= 4-18 HRS, dt=.03 HRS . 13 70 UNDISTURBED AREA . 19 78 Method Comment Tc (min) TR-55 SHEET FLOW SHEET FLOW 4.7 Woods: Light underbrush n=.4 L=50' P2=3.2 in s=.22 '/' SHALLOW CONCENTRATED/UPLAND FLOW UPLAND FLOW .4 Unpaved Kv=16. 1345 L=113' s=.07 '/' V=4.27 fps SHALLOW CONCENTRATED/UPLAND FLOW SHALLOW FLOW .4 Paved Kv=20.3282 L=128' s=.07 '/' V=5.38 fps Total Length= 291 ft Total Tc= 5.5 Data for GREATPOND B TYPE III 24-HOUR RAINFALL= 7.00 IN Prepared by ATLANTIC ENGINEERING & SURVEY CONSULTANTS, INC. 18 Jun 99 HydroCAD 5.01 001066 (c) 1986-1998 Applied Microcomputer Systems POND 1 DETENSION BASIN Qin = 3.17 CFS @ 12.05 HRS, VOLUME= . 19 AF Qout= 2.81 CFS @ 12.08 HRS, VOLUME= . 16 AF, ATTEN= 11%, LAG= 2.2 MIN Qpri= 2.80 CFS @ 12.08 HRS, VOLUME= . 16 AF Qsec= 0.00 CFS @ 12.08 HRS, VOLUME= 0.00 AF ELEVATION AREA INC.STOR CUM.STOR STOR-IND METHOD (FT) (SF) (CF) (CF) PEAK STORAGE = 2043 CF 134.0 428 0 0 PEAK ELEVATION= 136.4 FT 136.0 1050 1478 1470 FLOOD ELEVATION= 136.5 FT 136.5 1483 633 2111 START ELEVATION= 134.0 FT SPAN= 4-18 HRS, dt=.03 HRS 4 x FINER ROUTING Tdet= 69.8 MIN ( .16 AF) # ROUTE INVERT OUTLET DEVICES 1 S 0.0' EXFILTRATION V= .0001 FPM over SURFACE AREA 2 P 136.0' 2.5' BROAD-CRESTED RECTANGULAR WEIR X 1 .81 Q=C L H'1 .5 C=1 .95, 1 .98, 0, 0, 0, 0, 0, 0 3 P 134.6' 2" CULVERT n=.011 L=50' S=. 1 '/' Ke=.5 Cc=.9 Cd=.6 Primary Discharge _2=Broad-Crested Rectangular Weir 3=Culvert Secondary Discharge I I=Exfiltration POND 2 Not described Qin = 6.22 CFS @ 12.07 HRS, VOLUME= .38 AF Qout= 6.22 CFS @ 12.07 HRS, VOLUME= .38 AF, ATTEN= 0%, LAG= 0.0 MIN ELEVATION AREA INC.STOR CUM.STOR - METHOD (FT) (AC) (AF) (AF) PEAK STORAGE = 0.00 AF PEAK ELEVATION= 0.0 FT FLOOD ELEVATION= 0.0 FT START ELEVATION= 0.0 FT SPAN= 4-18 HRS, dt=.03 HRS # ROUTE INVERT OUTLET DEVICES Assumptions: The following assumptions are being used for design purposes: 1) Annual, 2, 10& 100 year storm frequency. 2) 24 hour storm duration (min.) 4) Hydrologic soils groups for the run-off areas are classified "C"soil groups under U.S.D.A. Soil Conservation Service guidelines S) The property lines are considered the design point for the hydraulic calculations Sub-catchment 4 will remain the same pre and post and as such will be excluded from this study.. Design Criteria: 1) Run-off quantities are calculated using TR-20 2) I=2.3 for Annual 124 hr. duration, 3.2 12yr., 4.8 in.110 yr. & 7.0 in.1100 yr. 3) Ch= 70 for undisturbed areas, 74 for grassed or landscaped areas, and 98 for impervious areas 4) Ilyetrograph shape=S.GS.III(eastern U.S.) S) The maximum f low rate and total volume of run-off for the Annual, 2,& 10 yr. design storms which are routed thru drainage system will not exceed preconstruction conditions 7) The first 114 inch of run-off(MIA9 from the proposed impervious surfaces will be re-infiltrated on site. 6661 S ),VW 131VCI 170-FT/6 '❑N S❑f ❑/`1Q'Qd❑aQN❑dld3dD\9903S\133I3 ❑NIMVdC[ 0-V66-ZS2-8L6 :XVJ 0L8L-ZS2-8L6 :3NOHd 22810 dW `NM013O�1030 - S 31lnS - =3 JiS k3NN3i L6 ,2133NIDN3 tb98TO VW `❑NIQd3d Hill❑N 133aiS NaVd OOZ S3SIddd31N3 iS3f10 Id❑3 Q3dVd3dd SS Vfi V 4&3A. 0GNV H 16(0N N/ Gvud Nod 1 V36(0 - d 107 1 V OaT 09 0 09 SV3cYV .LN3MHO.1 voenS ONUS/X3 ,09 =,T 1allo::)S 3HVl.40 03 H pp £*•9Z1='la ajpuids poly AWNHON38 / 1N3Y13SV3 AWAAW4 ~^ '' ` f °�i�.`Y�� g 0/7 SS300V JNUSIX3 "'\• 'ty \ e�oJ V b . --�� ` 1l s n AVM3MHa 118 XL anOdUd AM �� \ ``` Ors �" y~S�'\�• �. \ . 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