<br />OU1. 35
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<br />Hiver Ilndn.
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<br />21.1' The "virGin flow" !It 10e ;"orry ohov.n in the Report is 16,;'71,000
<br />!lOre feot f\nnu!llly. Coloro.do notos th:'t, ~,s previously cnlou1!lted by the
<br />Buro!lu of Ree l!Ul\!ltien for 8M h YO!lr of tho period 1097-19h3. the vir Gin
<br />flow nt lee Forr~, !lvornr,ed 16.223.000 acre feet !lralu!llly. and for the per-
<br />iod 1900-191,2 (employod by Colorndo on{;inoers) aver!lged 16.441.000 acre
<br />feet nnnu!llly. Independent estimatos by Co10r!ldo engineers, bnsed on re-
<br />corded flows at Lee /erry nvornging 14.300.000 nore feet annually. nnd
<br />upstroM "depletions" !lVel"[lf~inr.: l,952,OOO "ore feot nnnunUy durinG the
<br />period. indicllte a oomp!lro.blo fir;ure for "virgin flow" !It leo ;'ony of
<br />l6,260,OOO !lOre feet !lMual1y. The differenoe between the figure of
<br />16,271,000 llore feet shown in the Rnport, and the compnr!lb1e figure of
<br />16,2110,000 !lcre feet onloulatod by Co1crlldo engineers, is DO minor in
<br />llISOunt thllt it may properly be disrog."rded.
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<br />25. The Report fails tc present data concern;ng "virgin flcws" !It
<br />Bc"lder Dam, !lnd !It the Intern!ltiolUl1 flound!lry. As estimllted by Co10-
<br />ro.do engineers. for the river section between lee l'erry and Boulder jiron,
<br />under virGin conditions, the tributnry inflows tlvernged 1.300.000 acre
<br />feet !lnd the natur!ll losses averaged 130,000 acre feet, indic!lting !l net
<br />Go.in of 1.170,000 !lcro feet, which, !ldded to the virgin flow at Lee Ferry
<br />of 16,260,000 Mre feot. gIves a vire;in flow at Boulder Dam of l7.430,OOO
<br />acre feet annull11y; and for the river seotion between Boulder Dam and
<br />LnGunll Unm. the tributary inf10we averaged 200,000 acre feet and nntur!ll
<br />looseD avero.ged l,070,OOO nore feet, indioating a n/lt luse of 070,000
<br />nere feet, end 11 virC;In flow o.t lngun!l Do.m of 16.560,000 !lOre feet annual-
<br />ly, - as oomp!lred with the fiGure of 16.451,000 aore foet shov.n in the Re-
<br />port. Virgin flowe at the Intern!ltional Boundary, as oa1culated by Colo-
<br />rado enGineors. averuGed 18,000.000 aore feet annually. - no oomparEld \'lith
<br />the fiGure of 17.722,000 !lOre feut whioh miGht be dorived from the Roport
<br />by adding the 16.4:;1,000 at Le.guna Dnm to the 1.~?7l,OOO Gil!l River !It
<br />Dome. Here, too. the results !lre in substanti!ll agreement.
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<br />26. Ch!lpter II entitled. "Cl!limin[; tho n!lsin," includEls discunsions
<br />of explorations, settlement. nnd ec,rly dElveloprn<mt of the river for irri-
<br />c;ation, flood control, powor !lnd other pur[XJsos, and a sUllll1lC\ry of eondi-
<br />I;j,olln ill 1;ho onr1y 1920's. A1; p"r:o Z7 n tnl110 is prosentod ontitlod,
<br />"ll'ri(:,o.tion Dovelopment in tho COI01'(l.do Rivor Basin in 1S!22," which pur-
<br />ports to show the irrigoted ,!lnd irrignble nores in the Upr;er Rogion and
<br />in the Lower Region, inc ludinr; aore!lges in Hoxioo. Coloraclo points out
<br />that the term "Colorado River Ballin." as defined by Art. II (b) of the
<br />Co lel'!ldo River Compaot is limited to I'torri tory within tho Un1tod ::;tates
<br />of Amoric!ll" nnd sur;r;er,ts tho.t in liou of said t"blEl the followinG tabu-
<br />lntion bel subatituted, being informL\tion compiled from reports of the
<br />Unitod st!ltes Bureau of the Census, !lS followsl
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