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The drainage system in the neighborhood to the west of the airport property has three separate <br />outfalls into the Big Island Slough. Figure 2 shows the location of these outfalls. <br />Figure 2 - Glen Meadows Outfall Locations <br />Both the Farrington Drive roadside ditch and northern airport ditch systems drain to Spencer <br />Highway which outfalls to Big Island Slough channel. <br />m Drainage Design ..,riterm <br />Texas Deparlalient of Transpottation. ("FxDC)'F) Design. Criteria <br />Table 2 presents the TxDOT intensity -duration -frequency coefficients for use in the rational <br />method runoff calculations. TxDOT parameters were used to be consistent with the airport on -site <br />study. <br />La Porte Municipal Airport — Offsite Drainage Analysis <br />HT&J, LLC, January 2018 Page 5 <br />