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Attachment G-1 - A <br /> Development of 100year OF curve <br /> Hitch Rack Ranch Site <br /> Duration* Depth** Actual Intensity Modeled Intensity <br /> 10 1.15 6.9 6.92253 <br /> 15 1.41 5.64 5.800107 <br /> 30 2.07 4.14 4.03706 <br /> 60 2.69 2.69 2.65261 <br /> 120 3.31 1.655 1.680434 <br /> 180 3.63 1.21 1.273313 <br /> 360 4.17 0.695 0.784192 <br /> 720 4.74 0.395 0.479286 <br /> 1440 5.38 0.224167 0.291789 <br /> * Minimum duration of 10 minutes assumed for design calculations <br /> ** Depth for NOAA Point Precipitation Frequency Estimates(Attached) <br /> Hitch Rack Ranch Site <br /> OF Curve for 100yr Frequency <br /> 8 <br /> 6 <br /> 4 <br /> 2 <br /> 0 -- -- - -— - - - - --. ._ <br /> 1 10 100 1000 10000 <br /> tDepth" —*—Actual Intensity +Modeled Intensity <br /> B= SS./4.ib <br /> B <br /> D= 8 I=------------------------------ <br /> (Tc+ D)AE <br /> E= 0.7217 <br /> Tc= Time of concentration <br /> I = Rainfall intensity <br /> Coefficients generated by Hydrology Studio OF wizard <br /> Example Calc: 10 Min Tc <br /> 10 6.92253 in/hr <br />