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Exhibit 10 presents the ponding during the 5-year storm event for the proposed conditions. <br />Exhibit 11 presents the ponding during the 10-year storm event for the proposed conditions. <br />Exhibit 12 presents the ponding during the 100-year storm event for the proposed conditions. <br />p'arring oar Drive (West of Airport) Hydraulic Analysis <br />After the proposed improvements to the La Porte Municipal Airport system were made to the <br />XPSWMM model, the interaction between the airport property and the Glen Meadows <br />neighborhood, west of Farrington Drive, was examined again. The location of the study points <br />remained the same, however the channel was altered as described in the section "Proposed <br />Improvements" earlier in this report. The following tables present the water surface elevations, <br />overflow rates, and the comparison of overflow rates between the existing and proposed conditions. <br />Table 10 Farrington Drive Water Surface Elevations Proposed Conditions <br />Study <br />Point <br />Road <br />Elevation <br />WSE <br />100-yr <br />50-yr <br />25-yr <br />10-yr <br />5-yr <br />2-yr <br />1 <br />21.81 <br />22.02 <br />22.02 <br />21.89 <br />21.68 <br />21.51 <br />21.23 <br />2 <br />20.61 <br />20.98 <br />20.81 <br />20.69 <br />20.49 <br />20.30 <br />20.01 <br />3 <br />20.79 <br />20.80 <br />20.57 <br />20.46 <br />20.24 <br />20.02 <br />19.70 <br />4 <br />19.75 <br />20.42 <br />18.89 <br />1 18.75 <br />1 18.33 <br />18.28 <br />17.95 <br />Study <br />Point <br />Road <br />Elevation <br />Difference (WSE <br />- Road El.) [ft] <br />100-yr <br />50-yr 25-yr <br />10-yr <br />5-yr <br />2-yr <br />1 <br />21.81 <br />r <br />0.13 <br />0.30 <br />0.58 <br />2 <br />20.61 <br />;;, <br />-0.12 <br />-0.31 <br />-0.60 <br />3 <br />20.79 <br />' <br />-0.22 -0.33 <br />-0.55 <br />-0.77 <br />-1.09 <br />4 <br />19.75 <br />"' '%"`' % <br />-0.86 -1.00 <br />-1.42 <br />-1.47 <br />-1.80 <br />Table I Farrington Drive Overflow Rates Proposed Conditions <br />Study <br />Overflow Rate (cfs) <br />Point <br />100-yr <br />50-yr <br />25-yr <br />10-yr <br />5-yr <br />2-yr <br />1 <br />1.45 <br />1.29 <br />0.12 <br />0.00 <br />0.00 <br />0.00 <br />2 <br />11.56 <br />2.12 <br />0.26 <br />0.00 <br />0.00 <br />0.00 <br />3 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />4 <br />44.22 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />Total: <br />57.22 <br />3.41 <br />0.37 <br />0.00 <br />0.00 <br />0.00 <br />La Porte Municipal Airport - Offsite Drainage Analysis <br />HT&J, LLC, January 2018 Page 19 <br />