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Purgatoire River Drainage <br /> Watershed Flow Estimations <br /> Location Drainage 50-yr Flood 100-yr Flood <br /> Number Area 2% 1% <br /> square miles cfs cfs <br /> Trinidad 795 35 ,574 44 , 317 <br /> 07124500 <br /> Madrid 550 26 ,538 35 ,676 <br /> 07124200 <br /> Stonewall 52 . 1 362 412 <br /> 07124050 (Insufficient Time of Record) <br /> Ciruela Canyon 2 .9 950 1200 <br /> Maxwell 156 12 , 190 15 ,670 <br /> Results <br /> Peak Flow , Design 15 ,700 cfs <br /> Flow Area 550 sq ft <br /> Bridge Area 672 sq ft <br /> Colorado Highway Dept Estimates <br /> Peak Flow 13 ,000 cfs <br /> Bridge Area 600 sq ft <br />