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<br />FLOOD CONTROL ANDJ!RAI ~A~E PcLAN <br /> <br />For thi s study, ei ght improvement a lternativl?s were eva-I uated; four <br />for Montrose Arroyo, three on Cedar Creek and one for Dry Cedar Creek. <br />Improvement alternatives were examined for each stream only in developed <br />areas where damages occur. In undeveloped areas, a floodplain management <br />program should govern future development and would 1 imit damages due to <br />flooding. <br /> <br />Montrose Arroyo <br />Plan 1 - This plan consists of floodplain management for the entire <br />length of Montrose Arroyo. Such a plan would guide and regulate <br />future floodplain development and encourage measures that reduce <br />monetary loss. This alternative prevents an increase in average <br />annual damages that might be expected from future development. The <br />plan has the advantage of very low initial cost, but provides little <br />protection for existing property in the floodplain. <br /> <br />Plan 2 - The main feature of this plan is that of diverting flood <br />flows from Montrose Arroyo near South I'th Street to the UncompahCjre <br />River. By locating the diversion in the cit.y itself, both upstream <br />and 1 oca 1 dra i nage flows are reduced bE! 1 OVI the di versi on. The pro- <br />posed structure is a 10.5' x 10' concrE'te box cuI vert from Montrose <br />Arroyo, under the alley between South 7th and South 8th Strc"ets to <br />the west side of Townsend Avenue. A special inlet structure wou-Id <br />allow low flows to continue down the arroyo, but would divert that <br />part of the discharge in excess of J.OO cfs, up to a max-irnurn of J.,OOO cfs. <br /> <br />- 24 -- <br />