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<br />, <br /> <br />These formulas were developed by regression analyses during the studies <br /> <br />of the Purgatoire River at Trinidad, Colorado, and the Arkansas River <br /> <br />at Dodge City, Kansas. Sst is the equivalent slope of the principal <br />stream profile. Other terms are those defined in B-1 1110-2-1405, Fl.ood <br />Hydrograph AnaZyses and Computations. Additional equations necessary to <br /> <br />the final solution of the unit hydrographs are those contained in para- <br /> <br />graph 19 of that manual. Unit hydrograph data for 1~01f Creek at Granada <br /> <br />is presented on plate 1. <br /> <br />16. Standard Project Flood. A standard project flood is a flood <br /> <br />that would be exceeded only on rare occasions and in many instances <br /> <br />.' <br /> <br />defines the upper limit of flood magnitude against which protection is <br /> <br />sought. The standard project flood for Wolf Creek at Granada was <br /> <br />developed using one-half of the probable maximum precipitation (PMP) as <br /> <br />recommended at the 29-30 September and I October 1969 conference on <br /> <br />Hydrology for Spillway Design and Standard Project Floods, Arkansas River <br /> <br />and Tributaries, John Martin Dam to Great Bend, Kansas. The conference <br /> <br />was attended by representatives from aCE, SWD, and the Albuquerque <br /> <br />District. The PMP was determined from Hydrometeorological Report No. <br /> <br />33, published April 1956 by the U.S. Weather Bureau. <br />17. PMP rainfall data for the area of Wolf Creek contributing to <br /> <br />flooding at Granada were developed according to criteria in Hydromet Report <br /> <br />No. 33. These rainfall data were modified for shape factor using the Hop- <br /> <br />brook Dam criteria. A mass rainfall curve was plotted from a critical <br /> <br />arrangement of the 6-hour rainfall incr~ment. One-half of the P~~ rainfall <br /> <br />7 <br />