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<br />. <br /> <br />. <br /> <br />Afte~ calib~ation <br />f~equency-discha~ge <br />f~equency-discha~ge <br /> <br />of the model fo~ the basin, <br />cu~ves without Button~ock Dam <br />cu~ves of gauged data ve~y well. <br /> <br />the modeled <br />fit the <br /> <br />Button~ock Dam was then inse~ted in the calib~ated SWMM model of <br />St. V~ain C~eek at the Lyons gauge and ~ainfall was applied to <br />the 211 squa~e miles of mountain a~ea. It was found that 6-hou~ <br />~ainfall oVe~ South St. V~ain C~eek and No~th St. V~ain C~eek <br />below Button~ock Dam gene~ated higher discha~ges at Lyons than <br />did ~ainfall ove~ the enti~e mountain a~ea. The adopted <br />f~equency cu~ve at Lyons the~efo~e does not ~eflect any <br />cont~ibution to peak discha~ges from the 109 squa~e miles above <br />Button~ock. the adopted f~equency cu~ve at the mouth was <br />modeled by applying 6-hou~ ~ainfall to the 924 square miles of <br />cont~ibuting basin area. This curve was developed for existing <br />conditions and with Button~ock Dam in place. <br /> <br />Two diffe~ent 6-hou~ sto~ms were used in determining the 5-, 10- <br />50-, 100-, and 500-year discha~ge profiles. The profiles <br />above Boulder C~eek we~e p~oduced by centering a sto~m over the <br />St. Vrain basin above Boulde~ C~eek, excluding the area above <br />Button~ock Dam. F~om the mouth of Boulde~ C~eek to the mouth of <br />St. V~ain C~eek, the discha~ge p~ofiles were developed by <br />applying ~ainfall to the enti~e contributing area of the basin. <br /> <br />, <br /> <br />7 <br />