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<br />I <br />I <br />I <br /> <br />the intersection, spilling into Bear Canyon Creek and the <br />right overbank of Boulder Creek to the east of Foothills <br />Parkway, Analysis has shown that most of the water flows to <br />the north across Arapahoe Avenue combining with flows in the <br />main channel before passing under the Foothills Parkway <br />bridge. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The previous discussion applies to the definition of the Base <br />Section (16.1) for use in computing separate backwater <br />curves for Boulder Creek (BCSC) and the Research Park <br />(EXIST/AS-BUILT). Multiple runs using various definitions of <br />section 16.1 showed that upstream conditions were fairly <br />independent of the base section. The creek spills <br />approximately the same amount along the split flow weir, and <br />the profile through the Research Park remains the same above <br />the first few sections regardless of the base section. This <br />led to the adoption of the original Section 16.1, modified as <br />discussed previously, as the base section for practical <br />purposes. <br /> <br />TABLE 5 <br /> <br />COMPARISON OF ORIGINAL VS, AS-BUILT WATER SURFACE ELEVATIONS <br />(lOO-YEAR) <br />(see Fig, 4a and b for water surface profiles) <br /> <br />SAct:ion <br /> <br />16.1 <br />17 <br />19 <br />20 <br />20.1 <br /> <br />FRAD ROB 'Orial ROB 'Ag-'9ui1t:.l Diff. <br />5243.04 5243.25 5242.21 (1.04) <br />5246.69 5244.38 5242.44 (1.94) <br />5248,46 5246.67 5242,44 (4.23) <br />5253.15 5251. 78 5246.30 (5.48) <br />5256.47 5254,02 5253,28 (0.74) <br /> <br />To ensure the operation of the system as planned, attention <br />was given to the relative permanency of the weir crest, i.e., <br />the bikepath along Boulder Creek. This pathway consists of a <br />10-foot wide, reinforced concrete slab, built using modern <br />construction techniques with attention to sub-surface <br />conditions. Riprap armoring was placed where a majority of <br />flows enter the site from Boulder Creek just above the lower <br />Arapahoe Bridge (see construction drawings). The drop <br />structure at the west end of the site is also armored to <br />resist erosion as flood flows are concentrated at this point. <br />The UCBRP will provide perpetual maintenance for the entire <br />Wetlands Area. <br /> <br />In conclusion, every effort has been made to define the <br />effects of the construction on the previously published <br /> <br />Page 12 <br /> <br />Love &. Associates, Inc. <br />