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WSP11544
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Last modified
1/26/2010 3:17:53 PM
Creation date
10/12/2006 5:02:32 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.200.05.P
Description
Hoover Dam/Lake Mead/Boulder Canyon Project
Basin
Colorado Mainstem
Date
11/1/1968
Author
USACOE
Title
Report on Reservoir Regulation for Flood-Control Storage at Hoover Dam and Lake Mead
Water Supply Pro - Doc Type
Report/Study
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<br />00 <br />N <br />C=' <br />?,'~ <br />",:;::-~. .;- <br /> <br />20. Channel reaches with restricted caP8cities.--Three down- <br />stre8111 reaches have maximum nondamage capacities of less than 40,000 <br />cubic feet per second (see pl. 3). <br /> <br />a. The reach of the Colorado River from Parker Dam to Head- <br />gate Rock Dam is a canyon section with limited flood-plain benches. <br />No levees or other protective works have been constructed. There have <br />been no backwater studies to determ1ne channel capacities; however, it <br />is estimated that the capacity within the channel banks is about 30,000 <br />cubic feet per second. Flows greater than this will spread over the <br />banks and inundate developments which have encroached upon low-lying <br />portions of the flood plain. These developments consist of park areas, <br />hOllll!s, stores, c8lllpgrounds, and trailer parks on private and public <br />lands. Relatively small areas are involved and it is not plallned to <br />provide additional flood-protection features or to increase the channel <br />capacity. <br /> <br />,. <br />., .~ <br /> <br />b. In the reach from Palo Verde Diversion Dam to Taylor Ferry, <br />progressively increasing areaa of riverside residential developments <br />and agr~cultural lands would be subject to inundation as flowa increase <br />above approximately 30,000 cubic feet per second. Backwater studies <br />identify the water surface elevations which would be reached by specific <br />volume. of flow; however, overflow patterns on the flood plain are <br />complex and have not been defined. The problem ia complicated by the <br />presence of locally-constructed levees which have been partially re- <br />IDOved in recent years. There are no present plans for additional flood <br />protection of this area. <br /> <br />c. From Iaguna Dam to the mouth of the Gila River, a levee <br />protects California lands, but Arizona lands are unprotected for floWs <br />greater than about 35,000 cubic :feet per second. The lands which would <br />be inundated by larger flows are generally in agricultural use, the <br />only significant use of the area at the present time. Long-range plans <br />for a levee to protect these Arizona lands have not been supported by <br />landowners in the /lrea. Channel improvement and stabilization i. pre- <br />sently being planned in this area. When this work is complete, the <br />channel capacity should be slightly in excess of 40,000 cubic feet per <br />second. <br /> <br />21. Current operation plan. -- In the design operation plan for <br />Hoover Dam, general provision for use of an inflOll forecast in connection <br />with the rule curve was made, but a specific plan for the application of <br />the forecast was left for later development. Refined forecasting tech- <br />niques have JIIIIde it possible to reduce the fixed flood control storage <br />space in Lake Mead contemplated in the design operation plan by 500,000 <br />acre-feet during the period 1 November to 1 January. Furthermore, this <br />space IIIlY be reduced to a m1n1mum of 1,500,000 acre-feet provided that <br />the additional prescribed space is available in active storage space in <br />upstream reservoirs. The current operation plan is specified in the <br />flood control regulatiollll 1br Hoover Dam and Lake Mead (AppendiX A). For <br /> <br />7 <br />
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