WSP12392

• File Number: 8200.300.40.A
• Description: Colorado River Compact
• Basin: Colorado Mainstem
• Date: 11/13/1922
• Author: Co. R Compact Comm.
• Title: Minutes of Colorado Compact Commission - Meeting #13
• Water Supply Pro - Doc Type: Publication

such a regularity of flow thore, whon onco constructod.

Po rhaps, to got that cloar, supposing we said that tho

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flow Has to bo for an avorago of three years and that the flovl

in the fourth yoar vias to be such a rninimwn as vlith the total flow

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during the previous three yoars would givo a sufficiency to

havo kept those lavier rosorvoirs up to a constant flow from

thoir dischargo.

MR. CliRPEJ-iTER: You arrivo at tho same conclusion, Nr.

Chairman, bocauso tho control of tho dischargo from tho lower

reservoirs is entirely Hithin the koeping of tho lower users

and you would have to guard against the \Tastage and the care-

loss withdrav~ls in ordor to prevont tho withdrawal of extra

wator from tho upper torritory for roplacomont.

Now I might oxplain this to Mr. Norviol. Tho seloction

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of a ten yoar poriod "~s tho rosult of considoration of poriods

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from singlo yoar to twonty yoars. Tho bost avorago, of course,

and the fairest averago of the flow of any river is that obtained

from the t'lenty year poried as compared "lith ono. A study of

tho, flow of LaglU1a Dam, which appears on page 5 of the docwnent

No. 142 of tho 67th Congross, "Problems of tho Imporial Valloy

,andVicinity," will sho\T that to tako a throe yoar period would

impose a harsh and unnecossayy burdon on tho uppor torritory,

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in tho low cycle, - in a cycle of lm'l yoars. These years tend

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to run in cycles. On the othor hand, a tHonty year poriod was

considered unfair to tho lower basin as prolonging the reckon-

,ing and too romote a poriod. A considoration of this tablo and

13th - S.F.
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115

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