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Analysis Method : <br /> Regional Analysis Method as per: <br /> National Engineering Handbook , Hydrology: Section 4 <br /> 1964 <br /> Gaged Watersheds : <br /> Annual Peak Flow Data from U .S. Geological Survey <br /> Trinidad Station , Purgatoire River <br /> 07124500 <br /> Madrid Station , Purgatoire River <br /> 07124200 <br /> Stonewall Station , Purgatoire River <br /> 07124050 <br /> ' 50-yr & 100-yr Peak Flows from Soil Conservation Service <br /> Ciruela Canyon at Maxwell Mine <br /> Statistical Methods & Formulas for Computation: <br /> Cumulative Distribution Function & <br /> Least Squares Fit - Log Curves from: <br /> Handbook of Mathematical Functions <br /> Abramowitz , National Bureau of Standards , 1964 <br /> Open Channel Flow Calculations - Manning ' s Formula <br /> Additional Estimates from Colorado State Highway Department <br />