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<br />the railway yard cu~rts, and then determining the~reage which would produce <br />this flow rate. The acreage in excess of this estimated acreage (1100 acres) <br />. was analyzed for diversion. This alternative eliminates the need for improve- <br />ments at the railway yard. <br /> <br />The four (4) alternatives were analyzed using the hydrologic and hydraulic <br />methodologies defined by the scope of work and by Harris County's 'Criteria <br />Manual for the Design of Flood Control and Drainage Facilities'. <br /> <br />Each alternative was analyzed in sufficient detail to determine the construc- <br />tion cost and R.O.W. requirements. In aggregate, these two items produce the <br />estimated cost of each alternative. <br /> <br />For the diversion alternatives (III and IV) the BIOG-OO-OO watershed was first <br />analyzed to determine the ultimate drainage improvements and associated costs <br />required for full development of BlOG-OO-OO watershed. Then each di vers ion <br />tit alternative was analyzed to determine additional improvements required for <br />diversion and their associated costs. These additional costs were then added to <br />the cost of the associated FIOI-OO-OO drainage improvements. <br /> <br />Alternative I, the improvement of the FIOI-OO-OO channel and structures, <br />proved to be the most cost efficient alternative. Since the FIOI-OO-OO <br />watershed drains directly to San Jacinto Bay, the impact of full development on <br />downstream systems will not be realized. Whereas the diversion to BIOG-OO-OO <br />has considerable impact on Armand Bayou downstream of the BIOG-OO-OO outfall. <br /> <br />Therefore, Alternative I is proposed for the Master Drainage Plan for Unit <br />FlOI-OO-OO. <br /> <br />. <br /> <br />The ultimate improvements provided in the proposed Alternative I are structural <br />improvements at the major crossings of S.H. 14G, the Southern Pacific Railway <br /> <br />- 2 - <br />