WSP03469

• File Number: 8220.200.05.P
• Description: Hoover Dam/Lake Mead/Boulder Canyon Project
• Basin: Colorado Mainstem
• Date: 5/10/1979
• Author: USACOE
• Title: Transcript of a Public Hearing for Re-evaluation of A Flood Control Operation Plan for Hoover Dam: Los Angeles CA
• Water Supply Pro - Doc Type: Report/Study

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appear to be quite -- well a very low probability if such

flooding or floods occurring. The types of floods which occur

in the lower Colorado are generally not the types that endange

life because there is ample warning the floods are coming.

Particularly, that the larges -- or large amounts of storage

space in the reservoirs, so were not talking about risking ~if

and Limp, we're talking about highly infrequent possible flood

damages as a trade-off against considerably, water conserva-

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tion, tower-generation damage.

The alternative, or other one that I mentioned, is

improving the channels so that we could have even greater flow

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12 _O~ zoninq the area and removing present dwellings from the

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13 flood planned.

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Considerable improvements have been made in flood

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15 forecasting techniques since the original flood-control cri-

16 teria were prescribed in the 1930's, the particularly, with

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regard to spring snowmelt. These improvements should permit a

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smaller evacuation of reservoir storage space as of January 1,

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also providing the same degree of protection by A~ril 1st,

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which is the list of the annual snowmelt floods.

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This is assuming adequate channel capacities avail-

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able to evacuate additional storage space, While the ability

23 to predict winter rain floods has not improved to the extent

24 that snowmelt flood forecasting has, chiefly is because we

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cannot predict weather to any degree of accuracy on a long

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