Laserfiche WebLink
k I o t z associates <br />mouthsat the â–ºayous; flood proofingresidences; <br />This CWDS report brings together pertinent information developed in the three letter reports as <br />well as information developed subsequent to the letter reports to document both current drainage <br />issues and anticipated drainage problems arising from future development. The conceptual <br />strategy for addressing current and anticipated flooding and drainage problems consists of two <br />basic evaluations: 1) Solutions to current drainage and flooding problems, and 2) potential <br />mitigation of future drainage problems. To perform these evaluations, existing Federal <br />Emergency Management Agency (FEMA) hydrologic (HEC-HMS) models and hydraulic (HEC- <br />RAS) models for most major channels in the City were gathered -and evaluated; these models <br />were termed FEMA models. Limited field survey along with other data was used to construct <br />approximate models for some bayous and tributary channels for which FEMA models had not <br />been developed; these later models are termed non-FEMA models. Collectively, 16 different <br />FEMA and non-FEMA models were modified or developed to evaluate flooding conditions and <br />identify possible improvements to reduce flooding problems. <br />Solution of Current Drainage and Flooding Problems <br />To address the current flooding problems, channel improvements, development of relief swales <br />(i.e., directed sheet flow pathways), storm sewer outfall improvements, limited storm sewer <br />improvements; and detention ponds for flood flow diversion (termed "diversion ponds") were <br />considered. Proposed improvements made in prior studies by others were also considered as <br />appropriate to the drainage problems identified in this study. While detailed storm sewer <br />network analyses were not included in this planning level study, information on storm sewer <br />systems was utilized in defining surface drainage systems, identifying the need for storm sewer <br />system improvements, and in some cases identifying upgrades for sewer systems. <br />EN-3 <br />Klotz Associates Project No. 0127.008.000 La Porte Citywide Drainage Study <br />January 2009 City of La Porte <br />