1987-08-24 Public Hearings and Regular Meeting

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e e SUMMARY . In August, 1986, Landev Engineers, Inc. was contracted by Harris County Flood Control District to develop a master drainage plan for Unit Fl01-00-00. The scope of work called for the analysis of several possible alternatives which are briefly described here and in detail in the body of the report. The entire Fl01-00-00 drainage system in its present state is inadequate to hand 1 e a maj or flood event. However, several problem areas ex is t and 1 ead to the alternatives analyzed during the course of this study. The two major problem areas are the culverts which cross under the Southern Pacific railway yard and a maj or Exxon pi pe 1 i ne corr i dor wh i ch d is sects the watershed. The following paragraphs briefly describe the alternatives analyzed. Alternative I is the proposed alternative which involves the construction of improvements to the Fl01-00-00 drainage system as needed to contain the 100 . year flood event. Alternative II provides an adequate volume of detention storage west of the Southern Pacific Railway yard to limit the resulting 100 year flood discharges to the existing capacity of the railway yard culverts and thereby eliminates the need for improvements to these culverts. Alternative III is the diversion of 550 acres, to Unit B106-00-00, the approxi- mate F101-00-00 drainage area west of the Exxon pipeline corridor. This alter- native el iminates the need for improvements across the pipel ine corridor, and reduces the extent of other downstream improvement requirements. Alternative IV is the diversion of 1100 acres to the Unit B106-00-00 watershed. The acreage to be diverted was estimated by determining the existing capacity of . - 1 -