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r <br /> <br /> <br />North Eagk:vier Dromage Concept Phase <br />#3 DITGF/ANALYSSS CLWLLUSIOIV <br />The SWMM modeling (substantiated by the FCC-RAS model) of the #3 Ditch has the follweig prtincipd reaiNs <br />1. Peak 100 year storm nrgff yr the Ditch upstream of Eagkview Ford rill be 210 cfs .rith time to peak of <br />approximately IhrtOmin <br />2. The Ditch has capacity to ca^"eY base irttigatian flew of 100 cfs pWs rmrted 100 year storm tvroff from <br />the tadevebped brd lying smith of the Ditch ord the two Weber West detention ponds discharge without <br />overtopp'ag its bunks, though freebom~d is less than 1 foot at ekwar cross sections <br />3. If the Ditch had to corwey storm rvroff from the two odditiorml ar6-basins modeledvr the Comp Plan (dl <br />of #18 acrd #32), the intermediate spill sfrvchve recommended by the Comp Pkn rwld be rrerrssay to <br />prevent overtopp'ag of the rwrth bank. <br />4. Raising the rrorth bank for a great portion of the length of the Ditch inncstigated riM 6e roquired to <br />increase the capacity of the Ditch to carry secardmy irrigation flocs phrs 100 year storm naroff. <br />5. Altenatively, the ditch cap~ity may 6e increased by elimiratiig reaches of ad~erxx sbpes and by <br />ridening the ditch to the south. <br />The XP-SWMM model schematic an the fallorvig page shows depth and freeboard it the #3 Ditch at tech Goss <br />section of the model and the mmdmrm+ fbw in each ranch. Fbr it three reaches is listed as negative hecarse the <br />ditch slope nnlnarlated from Lidstorre 6 Anderson cross section data k up hill in these three reaches- <br />Following the XP-SWMM model schematic is a profile view of the #3 Ditch taken from the SWMM model. The <br />profile view is at peak 100 year' storm fbws plus bole 100 cfs irrigation. The profile ilhstrates the odvuse sbpes <br />of three reaches between cross sections 182 and 144. <br />The CAD drawing of the Ditch, followig the XP-SWMM schwmatic, shows contributing sub-basins, Weber West <br />ponds, Ditch cross sectiwis, and 6I5 corrtourx <br />Page 33 <br />Concept Ditch° morass Section #192-193 (Aaoldrtg dream) FSfrset bridge <br />