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<br />.. .:.,.' asfamJ ponds are.built.tomake a water supply available.Jor some
<br />:,~ '<'.. .:specific ]lurpose, and in general are located ;nd operated with re-
<br />. ., .., :.'spect to the contributing drainag~ area so tha~ most of the storage
<br />,.. capacity. is nearly always being. utilized. . For this reason. and he".
<br />.~.', . .ci!.Use of relli.tivelysmall drainage'areaswhich are controlled, t!)is
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<br />'.:',.'.. ,tyPe of storage, while servirig very effectively the useful purposes.
<br />. :;:. . for which it is designed; does not contrihutematerially to. flood cori-
<br />. . , ,. trQl: A considerahle number of these projects have been constructed.
<br />. ., and theyshQuld contiImetQ he built.wherever there'is need for de" .
<br />. veloping a surface water supply.
<br />..'The control.ofrunQffresulting from rainfall of prolonged duration
<br />:or,highintensity must .he secured through still larger reservoirs 10-
<br />. . c.ated directly Qn ,the main stems of the streams so as .to control a
<br />. .. substantial portion of the drainage area. Flood contrQI reservoirs
<br />: with the exception of relatively small co~servatiori pools .lire gener-
<br />ally oper.ated as temporary storage hasins so that flood discharges
<br />'. .. are retained only to .the extent "that they are in excessofchimnel
<br />capacities downstream.. Land . within. such reservoir basins .. is. stih-
<br />.. ject' to varying, a-Ithoughgreater degrees of inundation depending of
<br />... · course UPM the magnitude arid frequency of floods. . Much of the
<br />a;'ea in these reserVoIr basins continues to. remain available for agri-
<br />qultiiraI purposes inost of the tline. . '
<br />..'. Latgefloodcontrola~dii:rigatioh projectS are generally author-
<br />ized, by Congress to be constructed as public works; by li.gencies:of.
<br />,', the Federai Gcivernment in cooperation with the. states Qr theiqlolit-
<br />\ iC!llsub.divisioris: . 'the Corps <if Engineers of the War. Department
<br />, ...coristruct 'work~ which are to be utilized prinCipally fQr flood cQn-
<br />. frol "and navigation purposes., Reservoirs are built, maiptained and.
<br />" ,operated "by them wholly at federal expeIj8e. Levee project{! ap-
<br />,.,.. proved by Congress lirebuiltwheilthelocalcommuriities provide the
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<br />right.of ,way,and,agree to maintain the worKS ~nd pay any damages
<br />., .,'. resuiting.fI:om them. .' .. ...
<br />'TheBureau pf Reclamation of the Departmerit of Interior con- . .
<br />str\icts pr()jects which are built principally for the purpose of sup-
<br />plying water for. irrigatIon. The cost o{thes'\lprojects is repaid ~o
<br />" the ';F~.~eral ~G<?vern~ent. by the, water ,use,fs i+1. forty annual iD8tall~,
<br />" . menkwithout interest. Mo.streservQir projects are now constructed
<br />. . i~r multipleputposesand pro~Jde'storage also. for such other uses. as .. . ...
<br />. p()we'r, navigation; water supply li.nd, waste. disposa,L . The R~clamli.- .
<br />...,'. ,.. tlonProiectAct,Of 1939 provides for, the allocation Qf portions df
<br />... ',.. the cost of a project to the different p'Ul'poses whIch it will serve,
<br />... .:' Thus irrigation users now repay only that 'portion of the. costo! a
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