Laserfiche WebLink
<br />. <br /> <br />main outlet for Pond A-B empties into the Highline Canal and a <br /> <br /> <br />36-inch bypass allows some of the outflow to cross the canal. <br /> <br /> <br />However, there is no other way for minor flows to cross the <br /> <br /> <br />Highline Canal except at street crossings and no way to safely <br /> <br /> <br />convey major flows which could break through the canal and flow <br /> <br /> <br />through Lowry Air Force Base into the reservoir area at Kelly <br /> <br />Road Dam. <br /> <br />Improvements considered to alleviate the drainage problems in <br /> <br /> <br />this area included improving existing detention Pond A-B, con- <br /> <br /> <br />struction of additional detention ponds, construction of a <br /> <br /> <br />channel through Lowry Air Force Base, and construction of addi- <br /> <br /> <br />tional storm drains to convey runoff through the Highline Canal. <br /> <br />The choice of a means to improve drainage facilities in this <br /> <br /> <br />upstream area would have no bearing on components for downstream <br /> <br /> <br />areas where plan formulation is directed toward controlling major <br /> <br /> <br />floods. Major floods from the upstream area will cross the <br /> <br /> <br />Highline Canal with or without the improvement of drainage facili- <br /> <br /> <br />ties. Benefits, therefore, for these improvements were consid- <br /> <br /> <br />ered to be equal to the cost of the improvements. Total cost of <br /> <br /> <br />the improvements would be about $3.3 million. <br /> <br />PERMANENT RELOCATION <br /> <br /> <br />Consideration was given to the immediate and permanent <br /> <br /> <br />relocation of all flood plain structures downstream from Kelly <br /> <br />Road Dam. This would involve the relocation of 340 structures in <br /> <br /> <br />the lOO-year flood plain and 509 structures in the flood plain of <br /> <br /> <br />the standard project flood. The estimated values of these <br /> <br />structures are $25.8 million and $28.9 million, respectively. <br /> <br /> <br />Such a massive relocation is unacceptable because of the high <br /> <br /> <br />cost and severe social disruption that would result. <br /> <br />. <br /> <br />22 <br />