10-13-08 Drainage and Flooding Committee minutes

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k lot z 4~~ ass 0 cia t e s recommended relief swales is low ($21,000 or less), but channel improvements and diversion ponds, while having a higher cost-benefit ratio, provide greater protection against larger floods. Some of the construction cost impacts on the City can be reduced by using alternative, less traditional funding sources such as state or federal loans or grants, joint funding of projects in cooperation with other governmental entities, or establishing a storm water utility as an independent revenue source. Recommended Channel Improvement and Detention Pond Projects to Address Flooding Problems Project Subdivision! Area Benefiting Type of Project Construction ill Improvement Construction Cost Per Loss Cost Removed1 13 Fairmont Park, Fairmont Park East Channel Widening $781,000 $23,000 14 Brookglen Channel Lining $5,494,000 $29,400 15 Meadow Park, Villa Del Rancho Channel Widening $1,701,000 $47,000 16 Lennox Gardens, L Street Pond for Diversion $1,092,000 $50,000 18 Battleground Estates, Pinegrove Valley, P Channel Lining $1,032,000 $54,000 Street 19 Shady River Channel Widening $361,000 $60,200 21 Woods on the Bay, Pine Bluff, Shady Channel Widening $600,000 $75,000 River 23 Meadow Crest, Creekmont, Glen Pond for Diversion $8,314,000 $87,500 Meadows, Fairmont Park, Fairmont Park West Total 8 Projects $19,375,000 1 Total Construction cost divided by the number of structures that have been reported in the past to have flooded and for which recommended projects will alleviate flooding in the future. As the cost/benefit ratio rises, projects become less economically efficient. At some point, the cost/benefit ratio becomes so high as to render a project unreasonably expensive. An evaluation of the costlbenefit ratio (discussed at greater length in the Engineering Summary) for various ES-4 Klotz Associates Project No. 0127.008.000 January 2009 La Porte Citywide Drainage Study City of La Porte