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<br />during the course of the former ^w~ studies. As an example of AWR
<br />cooperative efforts, a compilation of basin and sub-basin drainage
<br />areas was prepared so as to standardize such figures.
<br />
<br />b. Determine the areal source of nlnoff within the watershed and
<br />establish the runoff characteristics,
<br />
<br />This item concerns the analysis of a watershed and its various
<br />\component parts in order to determine noncontributing areas, rates and
<br />amounts of runoff, response to various amounts and intensities of pre-
<br />cipitation, and, where required, the characteristics of seasonal var-
<br />liation in runoff, This item occasioned some controversy during the
<br />AWR study, Federal and State agencies and local interests concerned
<br />Iwith such matters should promote freer exchange of information and en-
<br />Icourage more inquiry concerning availability of information as well as
<br />I encourage the adoption of results coming from individual studies pre-
<br />, viously conducted.
<br />
<br />c, Establish a critical dry p9riod or periods for all sections of a
<br />watershed,
<br />
<br />Various Faneral and State agencies ann local interests have
<br />responsibilities which require that they analyze very carefully the
<br />'minimum flow of streams for certain p'Tiods in order to determine prob-
<br />: able future dependable flows. These items enter into power studies,
<br />water supply studies, irrigation studies, fish ~nd wildlife studies,
<br />pollution studies, 'water rights adrrlinistr;,t.ion and various other water
<br />use investL;ations. The record of 1'10'01 tr.gethcor I.;Hh .iudgment in
<br />selecting the neriod, as well as th" length of "er:lod used, are all
<br />important factors in the design of certain [,":,e:' co projects and in the
<br />'planning of certain progr11!1lS, It is :>robably not r"asible to use the
<br />same critical low flow rpriods for all p'u'no~e"; how'over, it seems highly
<br />desirable that where interrelated projects Ol' prcc;r'-!ms are designed or
<br />planned for several purposes, tl1a t uniform cri teria concerning critical
<br />flow flows should be ~sed by the various interests, Also, it behooves
<br />all interests involved in sucll plAnninG and design to utilize the latest
<br />basic data such ~s strearnflO1, and WGathAr records, So far as is known,
<br />this item caused no major controvEOrsy in the pre'IJaration of trle AWR
<br />report. However, it is an it2m of major importance in hydrologic
<br />coordination.
<br />
<br />d. Establish the flood history of the watcr:;hed, including magnitude
<br />and frequency of floods throu,~hout the ~lat ',rshed, and the origin and
<br />chp',ract'2ristics of the floods,
<br />
<br />SincG v3rious B'eder;,l 'lnd St.:lte agencies and loc",l interests
<br />arc concerned Iii th c~'rt~"'.in Cls!-)ects of rlo.::;ds J their effects, and their
<br />control, and since such interests are engaged in D1pnning and d,=signing
<br />projects and orcgrAMs in which floods Inust be talwn into Gccount, and
<br />sinc," such pro.18cts and progrm"s frequently constitute alternatives,
<br />partinl Rlternatives, or at leGst are quite' closely rel~t()cJ hydro-
<br />1ogiccclly, it is imv,rt"nt t-he_t '111 ag€mcies and interests use the same
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