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

.

.

C\1
c: range
e:
N 2 River
."'f!!

of day to, or two ahead, the completion of the Colorado

l
i
i'

Storage Project re servoirs has added a measure of addi.

3 tion~ flood control protection since the original flood-contro

4 plan was drafted, Even with the, or though the operating plans

5 for these reservoirs make no specific provisions for upstream

6 reservoirs, such as Colonel Keys' mentioned that, storage i~

7 Hoover Dam maybe traded, storage space would amply be traded fo

8 storage space and upstream reservoirs.

9 The upstream reservoirs in addition th at, or to

10 that, provide a major winter control of winter floods as a

11 result of the fact that following each irrigation season, they

12 are

gone down to some degree.

13

From the information given in the brochure, the

--

14 flood damages for flows up to about 50,000 cubic feet per

.1
i!

15 second do not appeat to be highly significant. Based on the

16 300 to 500 year recurrence for such floods, also mentioned in

o
~

.
.
~

17 the brochure, annual flood damages amount to approximately.

.
o
~
.

18 $8,000, which is compared to the considerable benefits, I think

;
z
W
z
z
S

19 is quite small.

20 This seems to indicate a higher risk may be desirabl

e
.
.
.
~

21 particularly in view of the water conservation and power genera

22 tion benefits that could be realized.

23 In our opinion, a plan with reduced flood-control

24 space and a maximum controlled rele.."", of 'l<;,nno o'lbic feet per

-"

25 second would enhance the power and water conservation functions