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<br />magnitude of flow for that flood is no= availab:e. Flood <br />losses in the study area usua:ly consisted of d2~maqe to <br />bridges and irrigation structures. In a numbey of flood <br />years, flood fighting was required to protect residential <br />and commercial areas from rising water. <br /> <br />2.3 Stream Hydrolocrv and Hydra~~~ics <br /> <br />To determine peak flows of 'che 1 DO-year flooc, the <br />U.S. Army Corps of Engineers made a flow-freauency analysis <br />of flows recorded at the "below Rico" and "at Dolores" <br />stream gaging stations on the Dolores River1 according to <br />guidelines established by the U.S. Water Resources Counci:. <br />Snowmelt floods and rain floods 'at the Dolores clage were <br />separated and statistically analyzed to determirle the type <br />of event that would cause the larger, less freqllent floods. <br />This type of analysis was not made for the Rico gage ~ecause <br />the period of record is too short~ <br /> <br />Unit hydrographs for the Dolores River were developed by <br />the Snyder, s-curve, and optimization techniquesir and were <br />based on the flows of the September 1970 flood at the Rico <br />and Dolores gages. Loss rates developed for this study were <br />compared to and found basically the same as those from <br />earlier studies made by the the Los Angeles Dist:rict of the <br />Corps of Engineers and the u.s. Bureau of Re=lan\stion. <br /> <br />Peak flow-frequency values found for t~e 1(:-, 50-, <br />100-, and SOG-year ~~oo6s a~ selec~ed ~ndex po:rl~S a=e <br />-;:abulated belo,,'. <br /> <br />1 Periods of recora: <br />1896-1903, 1911-12, <br /> <br />1914-15, ana 1952-present, Rico gage; <br /> <br />and 1992-present, Dolores gage. <br /> <br />-4- <br />