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Proposed Condidons Drainage Analysis <br />Proposed. Drainage t ni prove nients Farrington Drive <br />The drainage improvements discussed below are currently recommended to the TxDOT Aviation <br />Division for drainage on the airport property. These improvements will consequently improve <br />drainage for the bordering neighborhoods. <br />A 1,150 LF section of ditch is proposed to expand to function as a linear detention (See Exhibit 9). <br />The expansion will provide approximately 3.6 ac-ft. of storage. The downstream culvert structures <br />are proposed to be replaced with 2-42" pipes to increase conveyance. A typical cross section of <br />the ditch is presented in Figure 9. <br />Channel' Wideinkig, Ditdh Segment 12 <br />........................... 11gcpa ed—Ex�sLLung <br />19 <br />..1510 -1.00 -50 0 50 100 15(D <br />Station (t) <br />Figure 9 Widened Ditch Geometry along Farrington Road <br />Proposed. Drainage t ni prove nients North. Side <br />Expansion of the ditch system draining the northeastern quadrant of the airport is proposed to <br />alleviate flooding to the northern neighborhood. The flowline of the main drainage ditch running <br />along the border of the airport is proposed to drop by 2.5 ft. This lowers the hydraulic grade line <br />below the neighboring bank and provides linear detention. <br />The linear detention is proposed at two locations: <br />La Porte Municipal Airport — Offsite Drainage Analysis <br />HT&J, LLC, January 2018 Page 16 <br />