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<br /> Table 1l. Cost Estimate: Detention Alternative.
<br /> 10-Year System 100-Year System
<br /> Unit Um t
<br /> Cost Quantity Cost Quanti ty
<br /> Item (LF) (LF) Total Item (LF) (LF) Total
<br /> CHANNELS CHANNELS
<br /> Overflow Channels $ 15 27,800 $ 417,000
<br /> Section A 17 2,500 42,500 Section 8 $ 21 2,500 $ 52,500
<br /> Di tch Regradi n9 12 4,200 50,400 Ditch Reg radi ng 12 4,200 50,400
<br /> CULVEKTS CULVERTS
<br /> Twin 10' x 8' 350 220 77 ,000 Twi n 10' x 8' 350 220 77 ,000
<br /> PIPE (RCP) PIPE (RCP)
<br /> 18-inch 32 400 12,800 30-inch 70 1,950 136,500
<br /> 30-inch 70 1,550 108,500 48-inch 100 1,860 186,000 w
<br /> '-l
<br /> 36-inch 75 5,300 397,500 54- inch 115 5,160 593,400
<br /> 42-inch 85 3,300 280,500 60-inch 145 2,700 391,500
<br /> 48-inch 100 1,410 141,000 66-inch 175 1,450 253,750
<br /> 54-inch 115 3,460 397,900 78-inch 225 1,800 405,000
<br /> 66-inch 175 100 17 ,500
<br /> 78-i nch 225 100 22,500
<br /> INLETS AND MANHOLES 2,500 36 90,000 INLETS AND MANHOLES 3,500 36 126,000
<br /> DETENTION POND
<br /> Construction 10 ac. ft. 3,000 30,000 Construction 12 ac. ft. 3,000 36,000
<br /> Land 3.5 acre 2,000 7,000 Land 5.5 acre 2,000 11 ,000
<br /> Subtota 1 $2,092,100 $2,319,050
<br /> 20 Percent Engineering and Contingencies 418,420 463,810
<br /> TOTAL $2,510,520 $2,782,860
<br /> Annual Cost $ 240,000 $ 265,000
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