P Outlets Plugged

5

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Subcat

Reach

Pond

Link

Drainage Diagram for 2608-PROPOSED-SITE PLANS-pond revisions Prepared by Tetra Tech Rizzo, Printed 11/7/2008 HydroCAD® 8.50 s/n 005923 © 2007 HydroCAD Software Solutions LLC

Type III 24-hr 100yr Rainfall=6.80"

2608-PROPOSED-SITE PLANS-pond revisions Prepared by Tetra Tech Rizzo HydroCAD® 8.50 s/n 005923 © 2007 HydroCAD Software Solutions LLC

Printed 11/7/2008 Page 2

Summary for Pond 1: Inflow Area = Inflow = Outflow = Primary =

13.560 ac, 44.69% Impervious, Inflow Depth = 5.37" for 100yr event 82.50 cfs @ 12.07 hrs, Volume= 6.065 af 3.97 cfs @ 14.45 hrs, Volume= 1.593 af, Atten= 95%, Lag= 142.5 min 3.97 cfs @ 14.45 hrs, Volume= 1.593 af

Routing by Sim-Route method w/Net Flows, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 307.00' Surf.Area= 24,929 sf Storage= 97,290 cf Peak Elev= 314.18' @ 14.45 hrs Surf.Area= 31,769 sf Storage= 297,761 cf (200,471 cf above start) Plug-Flow detention time= (not calculated: initial storage excedes outflow) Center-of-Mass det. time= 277.3 min ( 1,061.1 - 783.8 ) Volume #1

Invert 302.50'

Elevation (feet) 302.50 303.00 304.00 305.00 306.00 307.00 308.00 309.00 310.00 311.00 312.00 313.00 314.00 315.00 Device #1 #2 #3 #4

Avail.Storage 324,411 cf

Surf.Area (sq-ft) 79 21,804 22,574 23,352 24,136 24,929 25,728 26,536 27,349 28,170 28,999 29,835 31,468 33,169

Perim. (feet) 31.0 746.0 753.0 761.0 768.0 775.0 783.0 790.0 797.0 805.0 812.0 819.0 831.0 842.0

Routing Primary

Invert 302.00'

Device 1 Device 1 Device 1

307.00' 307.50' 314.00'

Storage Description Custom Stage Data (Irregular)Listed below (Recalc) Inc.Store (cubic-feet) 0 3,866 22,188 22,962 23,743 24,531 25,327 26,131 26,941 27,758 28,583 29,416 30,648 32,315

Cum.Store (cubic-feet) 0 3,866 26,054 49,016 72,759 97,290 122,617 148,748 175,690 203,448 232,032 261,448 292,096 324,411

Wet.Area (sq-ft) 79 44,289 45,411 46,637 47,781 48,936 50,197 51,375 52,563 53,860 55,070 56,291 58,069 59,756

Outlet Devices 18.0" x 98.0' long Culvert RCP, groove end w/headwall, Ke= 0.200 Outlet Invert= 301.00' S= 0.0102 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior 3.8" Vert. Orifice/Grate X 0.00 C= 0.600 6.0" Vert. Orifice/Grate X 0.00 C= 0.600 4.00' x 4.00' Horiz. Orifice/Grate-OVERFLOW Limited to weir flow C= 0.600

Primary OutFlow Max=3.97 cfs @ 14.45 hrs HW=314.18' TW=277.58' (Dynamic Tailwater) 1=Culvert (Passes 3.97 cfs of 28.02 cfs potential flow) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate-OVERFLOW (Weir Controls 3.97 cfs @ 1.38 fps)

Type III 24-hr 100yr Rainfall=6.80"

2608-PROPOSED-SITE PLANS-pond revisions

Printed 11/7/2008 Page 3

Prepared by Tetra Tech Rizzo HydroCAD® 8.50 s/n 005923 © 2007 HydroCAD Software Solutions LLC

Summary for Pond 3: Inflow Area = Inflow = Outflow = Primary =

1.640 ac, 10.37% Impervious, Inflow Depth = 4.29" for 100yr event 8.52 cfs @ 12.07 hrs, Volume= 0.587 af 2.66 cfs @ 12.39 hrs, Volume= 0.317 af, Atten= 69%, Lag= 19.1 min 2.66 cfs @ 12.39 hrs, Volume= 0.317 af

Routing by Sim-Route method w/Net Flows, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 326.00' Surf.Area= 4,788 sf Storage= 12,581 cf Peak Elev= 328.14' @ 12.39 hrs Surf.Area= 7,149 sf Storage= 25,288 cf (12,707 cf above start) Plug-Flow detention time= 790.1 min calculated for 0.029 af (5% of inflow) Center-of-Mass det. time= 110.3 min ( 923.3 - 813.0 ) Volume #1

Invert 321.50'

Elevation (feet) 321.50 322.00 323.00 324.00 325.00 326.00 327.00 328.00 329.00 Device #1

#2 #3

Avail.Storage 31,901 cf

Surf.Area (sq-ft) 78 1,528 2,219 3,034 3,883 4,788 5,865 6,989 8,193

Perim. (feet) 31.0 199.0 227.0 266.0 291.0 314.0 342.0 369.0 397.0

Routing Primary

Invert 321.00'

Device 1 Device 1

326.00' 328.00'

Storage Description Custom Stage Data (Irregular)Listed below (Recalc) Inc.Store (cubic-feet) 0 325 1,863 2,616 3,450 4,328 5,317 6,419 7,583

Cum.Store (cubic-feet) 0 325 2,188 4,804 8,254 12,581 17,899 24,317 31,901

Wet.Area (sq-ft) 78 3,153 4,126 5,676 6,819 7,966 9,464 11,033 12,782

Outlet Devices 12.0" x 173.0' long Culvert RCP, groove end w/headwall, Ke= 0.200 Outlet Invert= 309.00' S= 0.0694 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior 5.2" Vert. Orifice/Grate X 0.00 C= 0.600 4.00' x 4.00' Horiz. Orifice/Grate-OVERFLOW Limited to weir flow C= 0.600

Primary OutFlow Max=2.66 cfs @ 12.39 hrs HW=328.14' TW=309.12' (Dynamic Tailwater) 1=Culvert (Passes 2.66 cfs of 10.42 cfs potential flow) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate-OVERFLOW (Weir Controls 2.66 cfs @ 1.21 fps)

Summary for Pond 5: Inflow Area = Inflow = Outflow = Primary = Secondary =

10.550 ac, 49.67% Impervious, Inflow Depth = 5.56" for 100yr event 67.53 cfs @ 12.07 hrs, Volume= 4.890 af 59.82 cfs @ 12.12 hrs, Volume= 3.702 af, Atten= 11%, Lag= 2.6 min 22.53 cfs @ 12.01 hrs, Volume= 2.123 af 37.46 cfs @ 12.12 hrs, Volume= 1.579 af

Routing by Sim-Route method w/Net Flows, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs

Type III 24-hr 100yr Rainfall=6.80"

2608-PROPOSED-SITE PLANS-pond revisions Prepared by Tetra Tech Rizzo HydroCAD® 8.50 s/n 005923 © 2007 HydroCAD Software Solutions LLC

Printed 11/7/2008 Page 4

Starting Elev= 282.50' Surf.Area= 11,025 sf Storage= 28,825 cf Peak Elev= 287.85' @ 12.12 hrs Surf.Area= 12,173 sf Storage= 90,902 cf (62,077 cf above start) Plug-Flow detention time= 188.3 min calculated for 3.040 af (62% of inflow) Center-of-Mass det. time= 60.1 min ( 841.3 - 781.1 ) Volume #1

Invert 279.50'

Elevation (feet) 279.50 280.00 281.00 282.00 282.50 283.00 284.00 285.00 286.00 287.00 288.00 Device #1 #2 #3 #4

Avail.Storage 92,683 cf

Surf.Area (sq-ft) 78 10,505 10,712 10,920 11,025 11,130 11,342 11,555 11,770 11,986 12,205

Perim. (feet) 31.0 412.0 415.0 419.0 421.0 422.0 425.0 428.0 431.0 434.0 437.0

Routing Primary

Invert 279.00'

Device 1 Device 1 Secondary

283.00' 287.00' 287.00'

Storage Description Custom Stage Data (Irregular)Listed below (Recalc) Inc.Store (cubic-feet) 0 1,915 10,608 10,816 5,486 5,539 11,236 11,448 11,662 11,878 12,095

Cum.Store (cubic-feet) 0 1,915 12,523 23,339 28,825 34,364 45,600 57,048 68,710 80,588 92,683

Wet.Area (sq-ft) 78 13,510 13,968 14,462 14,711 14,932 15,402 15,874 16,350 16,830 17,312

Outlet Devices 18.0" x 52.0' long Culvert CPP, square edge headwall, Ke= 0.500 Outlet Invert= 277.00' S= 0.0385 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior 5.00' W x 3.00' H Vert. Orifice/Grate X 0.00 C= 0.600 6.00' x 6.00' Horiz. Orifice/Grate Limited to weir flow C= 0.600 18.0' long x 31.0' breadth Broad-Crested Rectangular Weir-OVERFLOW Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Primary OutFlow Max=22.44 cfs @ 12.01 hrs HW=287.46' TW=280.51' (Dynamic Tailwater) 1=Culvert (Inlet Controls 22.44 cfs @ 12.70 fps) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate (Passes 22.44 cfs of 24.45 cfs potential flow) Secondary OutFlow Max=37.37 cfs @ 12.12 hrs HW=287.85' TW=280.97' (Dynamic Tailwater) 4=Broad-Crested Rectangular Weir-OVERFLOW(Weir Controls 37.37 cfs @ 2.44 fps)

Summary for Pond 6: Inflow Area = Inflow = Outflow = Primary =

17.000 ac, 65.18% Impervious, Inflow Depth = 5.01" for 100yr event 99.92 cfs @ 12.09 hrs, Volume= 7.102 af 90.37 cfs @ 12.14 hrs, Volume= 5.725 af, Atten= 10%, Lag= 2.9 min 90.37 cfs @ 12.14 hrs, Volume= 5.725 af

Routing by Sim-Route method w/Net Flows, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 277.00' Surf.Area= 17,325 sf Storage= 58,167 cf Peak Elev= 280.99' @ 12.14 hrs Surf.Area= 24,651 sf Storage= 141,630 cf (83,463 cf above start)

Type III 24-hr 100yr Rainfall=6.80"

2608-PROPOSED-SITE PLANS-pond revisions Prepared by Tetra Tech Rizzo HydroCAD® 8.50 s/n 005923 © 2007 HydroCAD Software Solutions LLC

Printed 11/7/2008 Page 5

Plug-Flow detention time= 204.4 min calculated for 4.390 af (62% of inflow) Center-of-Mass det. time= 57.2 min ( 855.0 - 797.8 ) Volume #1

Invert 272.50'

Elevation (feet) 272.50 273.00 274.00 275.00 276.00 277.00 278.00 279.00 280.00 281.00 Device #1 #2 #3

Avail.Storage 141,843 cf

Surf.Area (sq-ft) 156 10,887 12,411 13,993 15,630 17,325 19,076 20,884 22,747 24,668

Perim. (feet) 62.0 499.0 518.0 537.0 555.0 574.0 593.0 612.0 631.0 650.0

Routing Primary

Invert 272.00'

Device 1 Device 1

277.00' 280.00'

Storage Description Custom Stage Data (Irregular)Listed below (Recalc) Inc.Store (cubic-feet) 0 2,058 11,641 13,194 14,804 16,470 18,193 19,973 21,809 23,701

Cum.Store (cubic-feet) 0 2,058 13,698 26,892 41,696 58,167 76,360 96,333 118,142 141,843

Wet.Area (sq-ft) 156 19,665 21,285 22,965 24,622 26,420 28,278 30,197 32,177 34,217

Outlet Devices 36.0" x 70.0' long Culvert CPP, square edge headwall, Ke= 0.500 Outlet Invert= 271.00' S= 0.0143 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior 6.00' W x 2.50' H Vert. Orifice/Grate X 0.00 C= 0.600 7.00' x 7.00' Horiz. Orifice/Grate Limited to weir flow C= 0.600

Primary OutFlow Max=90.29 cfs @ 12.14 hrs HW=280.99' TW=272.52' (Dynamic Tailwater) 1=Culvert (Passes 90.29 cfs of 93.15 cfs potential flow) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate (Weir Controls 90.29 cfs @ 3.25 fps)

Summary for Pond 7: Inflow Area = Inflow = Outflow = Primary = Secondary =

19.450 ac, 62.21% Impervious, Inflow Depth = 4.16" for 100yr event 101.10 cfs @ 12.13 hrs, Volume= 6.736 af 44.68 cfs @ 12.23 hrs, Volume= 5.218 af, Atten= 56%, Lag= 5.7 min 32.68 cfs @ 12.31 hrs, Volume= 3.456 af 13.57 cfs @ 12.22 hrs, Volume= 1.762 af

Routing by Sim-Route method w/Net Flows, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 270.00' Surf.Area= 18,615 sf Storage= 35,694 cf Peak Elev= 273.99' @ 12.43 hrs Surf.Area= 28,400 sf Storage= 128,570 cf (92,876 cf above start) Plug-Flow detention time= 182.9 min calculated for 4.399 af (65% of inflow) Center-of-Mass det. time= 48.6 min ( 895.0 - 846.4 ) Volume #1

Invert 267.50'

Avail.Storage 128,846 cf

Storage Description Custom Stage Data (Irregular)Listed below (Recalc)

Type III 24-hr 100yr Rainfall=6.80"

2608-PROPOSED-SITE PLANS-pond revisions Prepared by Tetra Tech Rizzo HydroCAD® 8.50 s/n 005923 © 2007 HydroCAD Software Solutions LLC

Elevation (feet) 267.50 268.00 269.00 270.00 271.00 272.00 273.00 274.00 Device #1

Surf.Area (sq-ft) 78 14,542 16,522 18,615 20,834 23,172 25,668 28,428

Perim. (feet) 31.0 633.0 667.0 707.0 742.0 778.0 824.0 903.0

Routing Primary

Invert 267.00'

#2 #3 #4 #5

Device 1 Device 1 Device 1 Secondary

270.50' 271.50' 273.00' 267.00'

#6 #7

Device 5 Device 5

270.00' 273.00'

Inc.Store (cubic-feet) 0 2,614 15,521 17,558 19,714 21,993 24,409 27,036

Cum.Store (cubic-feet) 0 2,614 18,136 35,694 55,408 77,400 101,810 128,846

Printed 11/7/2008 Page 6 Wet.Area (sq-ft) 78 31,888 35,465 39,892 43,992 48,412 54,331 65,222

Outlet Devices 24.0" x 108.0' long Culvert CPP, square edge headwall, Ke= 0.500 Outlet Invert= 265.84' S= 0.0107 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior 5.00' W x 1.00' H Vert. Orifice/Grate X 0.00 C= 0.600 6.00' W x 1.00' H Vert. Orifice/Grate X 0.00 C= 0.600 7.00' x 7.00' Horiz. Orifice/Grate Limited to weir flow C= 0.600 15.0" x 24.0' long Culvert CPP, square edge headwall, Ke= 0.500 Outlet Invert= 266.62' S= 0.0158 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior 1.00' W x 2.00' H Vert. Orifice/Grate X 0.00 C= 0.600 4.00' x 4.00' Horiz. Orifice/Grate Limited to weir flow C= 0.600

Primary OutFlow Max=28.39 cfs @ 12.31 hrs HW=273.83' TW=270.22' (Dynamic Tailwater) 1=Culvert (Outlet Controls 28.39 cfs @ 9.04 fps) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate (Passes 28.39 cfs of 69.45 cfs potential flow) Secondary OutFlow Max=12.04 cfs @ 12.22 hrs HW=273.45' TW=269.30' (Dynamic Tailwater) 5=Culvert (Inlet Controls 12.04 cfs @ 9.81 fps) 6=Orifice/Grate ( Controls 0.00 cfs) 7=Orifice/Grate (Passes 12.04 cfs of 15.61 cfs potential flow)