10-13-08 Drainage and Flooding Committee minutes

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. B106-00-00 (Existing and Future Conditions) . B 1 06-02-00 (Existing and Future Conditions) . B106-05-00 (Existing and Future Conditions) . B109-00-00 (Future Conditions) . B 112-00-00 (Existing and Future Conditions) . Bl12-02-00 (Future Conditions) . F101-00-00 (Existing and Future Conditions) . F101-03-00 (Existing and Future Conditions) . F101-05-00 (Existing and Future Conditions) . F 10 1-06-00 (Future Conditions) . F212-00-00 (Existing and Future Conditions) . F216-00-00 (Future Conditions) . F216-01-00 (Existing and Future Conditions) k lot z 4~. ass 0 cia t e s Improvements for existing condition channels are predominately channel widening. Exhibit 4-4,4-5, and 4-6 shows where widening or channel lining is proposed. Widened channels are presumed to be trapezoidal in section; basic dimension are given in the Tables 4-1 and 4-2. Estimated excavation for the proposed channel widening has been determined from the difference in cross sectional area of the existing channel and the proposed channel. Land acquisition acreage for channel widening assumes that only right-of-way for maintenance berms along an existing channel must be acquired. Representative land acquisition costs for undeveloped and developed land are described in Section 5. It should be noted that no channel improvements are proposed for Little Cedar Bayou (F216-00-00) for existing conditions. After reviewing the report titled "Hydraulic Analysis for Little Cedar Bayou Watershed: HCFCD Unit F216-00-00" submitted by Binkley & Barfield on January 2000, the improvements detailed in that report were determined to be adequate for planning purposes. It is recommended that the City pursue the improvements as specified in the aforementioned report to reduce the current flooding due to lack of channel capacity. 4-13 Klotz Associates Project No. 0127.008.000 January 2009 La Porte Citywide Drainage Study City of La Porte