WSP06896

• File Number: 8220.200.05.P
• Description: Hoover Dam/Lake Mead/Boulder Canyon Project
• Basin: Colorado Mainstem
• Date: 4/30/1979
• Author: USACOE
• Title: Transcript of the Formal Presentation at the Public Hearings for Re-evaluation of A Flood Control Operation Plan for Hoover Dam
• Water Supply Pro - Doc Type: Report/Study

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turn the lights off again.

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You might have to tocus t:hat a

little bit, Stan. This bar graph t.nda to .how that and it:

shOW. you the d.cr.... in b.n.fits and it'. brok.n out; on

the side by thousand. ot dollars and on the right: dde by

t.he alternative nU%llber on the bu. leg line there. And,

.a you can se., only one, alternative 9, 1. above the line.

'.t'he 80clal and envlro~ntal effect. Of the

alternative plana are not quite so .aaily demonstrated. The

social .tfects would be tho.. that normally aocompany

i', flooding, there would be c!islocation trOM home., lost W4ljJe.,
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pnbaps intury or even duth. Quant:lfyinq the.e effecta for I
the altern.tive plans 18 not pos.ible, how.ver, the flood I
In general, I
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dtUtlaqea might be used .. an in4irect measure.

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the greater the flood dlUllag.., the greater w111 be the

1 I .oclal probl....

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Although . great d.al ot information on the veqe-

tatlon and wildlife along the Lower Colorado River 1a

ava11able, comparing the eftect. of the alternative Hoov.r

I" operation plan. on the natural environment 18 not a 8impl.

Clatter. l1'e can, however, make SOIIIAl general obs.rvat.ion..

Perlodic flow. up to twenty thousand eubie-t..t-per-8.cond

(20,000) eta above Imperial DAIl\ and up to t.n thousand

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cub1c-f..t-per-..cond (10,000 ct.) below Imperial Dam would I

be almoat ent.irely ben.ficial tor their fluahinq and cl.anin.
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effect.

As flows increase above the.. limits, beneficial