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Table 4 - Summary ®f Unit Costs <br />Detention Pond - aboveground ( I ae-ft storage) <br />Pond structure <br />$109,594 <br />Inlet -outlet -emergency overflow works <br />$33,158 <br />SWPPP (storm water pollution prevention plan) <br />$2,803 <br />Debris trapping devices <br />$118,856 <br />Geotechnical (I borings per ac-ft of storage) <br />$4,110 <br />Total <br />$268,521 <br />Estimated Unit Cost <br />$269,000 per ac-ft of storage <br />Detention Pond - below ground (I ac-ft of storage) <br />Storage pipes with excavation (from sewer costs-6162 It total) <br />$1,101,285 <br />Inlet -outlet -emergency overflow works <br />$33,158 <br />SWPPP (storm water pollution prevention plan) <br />$2,803 <br />Debris trapping devices <br />$118,856 <br />Geotechnical (I borings per ac-ft of storage) <br />$4,110 <br />Total <br />$1,260,212 <br />Estimated Unit Cost <br />$1,260,000 per ac-ft of storage <br />In -line Detention (providing I ac-ft of additional storage) <br />Channel length required (ft): <br />Estimated Unit Cost (based uLon channel widening) <br />$ 122,000 per ac-ft of additional storage <br />Channel Widening (500 ft long, with 4 ft of widening) <br />Widening with headwall improvements <br />$16,136 <br />SWPPP <br />$1,600 <br />Geotechnical (3 borings per 500 11) <br />$4,645 <br />Total Cost <br />$22,381 <br />Estimated Unit Cost <br />$11.00 per It of channel lengLLer ft of widening <br />New Channel (for diversion or bypassing-500 it long, 12 tt bottom width) <br />Excavation, headwalls and related <br />$45,658 <br />SWPPP <br />$1,600 <br />Geotechnical (3 borings per 500 ft) <br />$4,645 <br />Total Cost <br />$51,903 <br />Estimated Unit Cost <br />$8.67 per It of channel length per ft of bottom width <br />Klotz Associates City Wide Drainage Study <br />Project No.: 0127.008.000 City of La Porte <br />