10-13-08 Drainage and Flooding Committee minutes

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k lot z ~~. ass 0 cia t e s SECTION 4 IDENTIFIED DRAINAGE AND FLOOD CONTROL REMEDIES 4.1 Approach Remedies for addressing identified drainage and flooding problems incorporated improvements identified directly as a consequence of the modeling and analysis methods discussed in Section 3 of this CWDS report, review of prior drainage studies for the City and abstraction of recommended drainage improvements from those studies that are appropriate to the problems identified in this study, and inclusion of some term remedies identified and described in Letter Report No.1. 4.2 Identified Types of Remedies for Existing Conditions Within the limits of information available for the development of the CWDS, identified drainage and flood control problems fall into three broad categories: Problems arising from flooding of primary or main tributary channels, as evidenced by estimated out-of- bank conditions; significant numbers of reports (of different types, as shown on Table 2- 2) on flooding when nearby out-of-bank conditions do not occur or a channel is at considerable distance from the problem area; or various reports, site inspection, and review of topographic information indicates a condition conducive to or arising from significant localized ponding because lack of drainage pathways. 4.2.1 Remedies for Insufficient Channel Capacity Primary or major tributary channel flooding was concluded to be the primary flooding problem source when either delineated floodplains more or less encompassed the drainage problem area or the existing channel in the vicinity of the problem area did not have the capacity to convey the design discharge. While this evaluation used the channel 4-1 Klotz Associates Project No. 0127.008.000 January 2009 La Porte Citywide Drainage Study City of La Porte