A timber railroad bridge in Nebraska at Milepost 271.32 on the railroad system shown in the sketch is to be replaced with a new concrete structure. The 50- and 100-year flood magnitudes are needed to establish the low chord and embankment elevations, respectively. Determine the design flow rates using the SCS TP-149 method. The bridge drains the zone marked, about 45 acres. The moderately sloped basin lies in a Type-II storm region, the curve number is 70, and the 24-hr, 50- and 100-year rainfall depths are 8.6 and 9.4 in., respectively.
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