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IML <br />�r X� <br />ry <br />1�1 <br />" <br />01 <br />AN <br />�r���auriar � Df �jf <br />rr — <br />r () t <br />�. <br />a" 1 r'JU <br />Y r is <br />F <br />......... <br />..., , . <br />FIGURE 6 — PIPELINES AT THE AIRPORT <br />3.3. EXISTING DRAINAGE SYSTEM ANALYSIS <br />Hydrologic Analysis <br />Hydrologic calculations were performed in accordance with the TxDOT Hydraulic <br />Design Manual. The Rational Method was used to calculate peak flows using the <br />TxDOT rainfall intensity coefficients in Table 1. Contributing drainage area <br />boundaries were established based on the topographic survey and drainage culverts <br />detail data provided by Gessner Engineering. Rainfall totals were obtained from the <br />Harris County Flood Control District H&H Manual for the purpose of developing <br />hydrograph and model simulation, and can be found in Table 3. <br />TABLE 3 — HARRIS COUNTY HYDROLOGIC REGION 3 RAINFALL (INCHES) <br />0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 <br />Page 117 <br />