Drainage and Flooding Report January 2009

Browse Search

k I o t z associates 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. Project Subdivision/. area Benefiting Type of Project �.�� I Constructions ID j Improvement Construction Cost Per Loss ! Cost Removed 13 Fairmont Park, Fairmont Park East ; Channel Widening $781,000 $23 000 14 C Brookglen Channel Lining ( $5 494 000 $29 400 1 15 Meadow Park, Villa Del Rancho Channel Widening ( $1,701,QQ0 $47,000 16 fi Lennox Gardens, L Street 1 Pond for Diversion $1,05�,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 1 21 Woods on the Bay, Pine Bluff, Shady Channel Widening $600,000 $75,000 River 23 Meadow Crest, Creekmont, Glen — Pond for Diversion ...... w $8,314,000 $87,500 Meadows, Fairmont Park, Fairmont Park West -- — - ------- Total 8 Protects j $19,375,000 1111_1_1111111_]'1____'____' t --------- -- 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 cost/benefit ratio (discussed at greater length in the Engineering Summary) for various ES-4 Klotz Associates Project No. 0127.008.000 La Porte Citywide Drainage Study January 2009 City of La Porte