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<br />'. <br /> <br />water spills to the left bank gravel pit area and flows in a separate <br />flow path before rejoining the main flow just below the Fossil Creek <br />Ditch diversion. The amount of flow to this spill was computed using <br />the spli t flow routine from the 1989 SFH study. The left bank flow <br />path through the gravel pits was modeled with the file LPATH91. The <br />possibility exists that future erosion might cause increased spills to <br />LPATH. No definite predictions of future erosion could be made so <br />this spill was modeled for "existing conditions". <br /> <br />The other major flow diversion in the 10\f.er reach was a divided <br />flow through gravel pits on the right bank from just below the Timnath <br />Reservoir Canal diversion to just upstream of Prospect Road. The <br />divided flow path was modeled by the file RPATH91. The division of <br />flow between the main channel and RPATH91 was determined by balancing <br />the energy loss between LCWER and LCWER500 and RPATH91. <br /> <br />In the upper reach of the study (above the Timnath Reservoir Ditch <br />diversion), the main flow of the Cache La Poudre was modeled using two <br />HEX::-2 models. UPPER modeled the 10-, 50- and 100-year events. <br />UPPER500 modeled the 500-year event in this reach. <br /> <br />In the upper reach there were several divided flows. Between <br />Mulberry street and Lincoln Avenue, flow from the 500-year event <br />overtopped Lemay Avenue on the left bank. This spill was not modeled <br />in the 1989 study. . A new split flow routine was added to the UPPER500 <br />model to compute the flow lost to this spill. The water flowing <br />across Lemay entered the Dry Creek drainage and returned to the <br />LOWER500 model via Dry Creek. <br /> <br />Just upstream of the Lincoln Avenue bridge, flood flows spilled <br />across a low bank area and flowed east along the north side of Lincoln <br /> <br />7 <br />