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2) A section will be widened by approximately loft to provide additional conveyance. (See <br />Figure 11). <br />3) An existing 12" culvert will be upsized to 24" at the downstream end of the northern linear <br />detention. <br />IN <br />Channel" Widenling, Ditch egrnent 1 <br />..................Flrcjpapd-Exktlirng <br />100 -80 -60 -40 -20 0 20 40 60 90 104E <br />Sta�� rr (rrb <br />Figure 11 Widened Ditch Geometry <br />The proposed ditch and culvert improvements are shown in Exhibit 9. <br />1..:.lydrofogs c An alysn s <br />No changes were made to hydrologic parameters from the existing model as there are no significant <br />anticipated land use changes. <br />Hydraulic Analysis - La Porte Airport property <br />The existing XPSWMM model was updated to reflect proposed changes to structures and ditches. <br />With the proposed improvements the La Porte Municipal Airport satisfies the FAA requirements <br />while improving drainage conditions to the neighboring communities. <br />During the 10-year storm event, the proposed improvements contain flow within the ditches. <br />Though some overtopping occurs at the west side of the airport (along Farrington Road), flooding <br />conditions are significantly improved. During the 5-year event flow is mostly contained within <br />the roadside ditch along the western drainage ditch with a minimal impact at the south most end. <br />La Porte Municipal Airport — Offsite Drainage Analysis <br />HT&J, LLC, January 2018 Page 18 <br />