Laserfiche WebLink
<br />storage of flood waters (detention ponds) in Basin 6100 has <br />practical application. Existing ponds or proposed ponds will <br />help reduce damages downstream. <br /> <br />The undeveloped reaches of the drainageways downstream of the <br />Arapahoe-Jefferson county line should be regulated, or property <br />should be acquired to preclude future development in the flood <br />plain. <br /> <br />The cost difference between faQility designs for 10- and <br />100-year frequency storms is not large, while the damage <br />associated with the 100-year flood is significantly greater. <br />Thus, the 100-year storm event was chosen as the design flood <br />for this study. <br /> <br />All but one of the benefit-cost ratios calculated for the <br />alternative drainage controls were below 1.0. Thus, the <br />recommended alternatives should be based on least cost unless <br />additional expenses can be justified in response to desires of <br />the citizens. <br /> <br />Multi-use of drainageway plans, such as for green belts and <br />bike trails, can be coordinateQ with local park and recreation <br />districts to share costs and maintenance of the facilities. <br /> <br />The positive environmental effects of implementing a drainageway <br />plan in the study area will outweigh the temporary disturbances <br />during the construction of the flood control facilities. <br /> <br />RECOMMENDATIONS <br /> <br />Various flood control measures were studied for the different <br />basin reaches. The recommended basinwide drainageway plans <br />were developed based on the Phase A and phase B findings and <br />the review and suggestions of the Urban Drainage and Flood <br />Control District and Arapahoe and Jefferson Counties. The <br />preliminary design of the selected control measures is summarized <br />below. Generally the drainageway plans are a mixture of <br />control facilities in the wider flood plain reaches in combina- <br />tion with nonstructura1 measures in the narrow flood plain <br />sections where flow damage to existing or future development <br />should not be extensive. <br /> <br />BASIN 6100 <br /> <br />The alternative solutions for each <br />benefit-cost ratios less than 1.0. <br />cost alternatives are recommended. <br /> <br />reach of Basin 6100 have <br />On this basis, the least <br /> <br />2-2 <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />