10-13-08 Drainage and Flooding Committee minutes

Browse Search

k lot z 4~. ass 0 cia t e s flow to detention storage to lessen the maximum flow and lower the water surface in the channel becomes a potential option to widening of the channel. Diversion sites of sufficient size in the City that could provide sufficient storage to generally lower water levels in B112-00-00 to the point where flooding and backup of waters into residential areas is not a problem are not available. However, some open lands north of the City boundary not committed to future development are apparently currently available for a diversion pond (see pond site for Project 20 in Figure ES-1). Because of its location, coordination for development of this site would have to be pursued in close cooperation with the adjacent city and other stakeholders. The estimated cost for the channel lining project within the City limits, Project 14, is . approximately $5.5 million, while the estimated cost for diversion pond construction outside of the City limits, Project 20, is $11.3 million. However, the diversion project has potential regional benefits (and does not have the undesirable environmental features of a lined channel) and thus has consequent possibilities for cost sharing with other parties. Thus, before a decision is made as to which option to pursue; discussion needs to be undertaken with the adjacent city as well as other stakeholders such as the Harris County Flood Control District (HCFCD) as to the possibilities of development of the site for a detention pond. The estimated costs for constructing the various recommended projects (exclusive of sewer system improvement costs) to address current flooding and drainage projects are listed in Table ES-l. The cost elements include land acquisition (assumed to be developed land for channel improvements and undeveloped land for ponds), site preparation, excavation, lining (when used), culvert removal and/or installation (when part of the project), and site stabilization after construction. Because of the nature of home buy-out, buy-out as an alternative to channel improvements or diversion ponds was not specifically evaluated. The recommended priority for the various projects is based upon the cost-benefit analysis described above. EN -10 Klotz Associates Project No. 0127.008.000 January 2009 La Porte Citywide Drainage Study City of La Porte