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<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 />I <br />I <br />I <br /> <br />Total rainfall was estimated in the basins. Rainfall in areas west of Campus were estimated <br />from the rainfall isohyetal maps as shown in Figure 3. For the West Plum Street Basin a <br />total rainfall of seven inches was used, and for the Clearview Channel Basin 7.8 inches of <br />rainfall was used. Models for the Canal Consolidation Study and the West Plum Street <br />Basin Study simulated runoff from these areas. <br /> <br />These models were previously developed as part of Master Drainage Studies for the City of <br />Fort Collins. These models had not simulated runoff for greater than a 1 OO-year event. <br />Therefore the models were run for the July 28, 1997 event to estimate the flows entering the <br />campus. Figure 4 shows hydrographs for the canal overtopping and compares the 1997 <br />storm estimates to the 100-year simulation. <br /> <br />Specifically element #53 (lagoon/library parking lot) was extended to allow overflow of the <br />storage area. The storage-elevation and elevation-discharge curves are presented in <br />Figure 5. These curves show the spill of water that would occur into the Engineering <br />parking lot and south along Center Avenue. Element #15 (heating plant & oval area) was <br />extended to allow for storage behind the railroad. Element #14 (College Gym) was revised <br />to allow for greater overflow across College Avenue. Storage-elevation and elevation- <br />discharge curves for these elements are shown in Figures 6 and 7. <br /> <br />7 <br /> <br />Ayres Associates <br />