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<br />complete,.,pro'!ieqtion aga,~n$t thestandllX'd proJect flood. This is due to
<br />the uncontrolled area below'.the dam which would produce minor flood$ .
<br />during very inte'n$e storms,' ,Under .co!:lditio!:ls modified by the proposed
<br />plan of improvement, the average Ilnn1l,al d!ij1lages ba$ed on floods Of record
<br />would amount to ~p;340, and tho$e that, would result from an occurrence of
<br />the $tandard pro,iect' flood amount tQ~i210, or a total of ~)550. . The an-
<br />nual benefits ,accruing to the proje~t' due to the p~evention of flcod
<br />damages are the difference between the average annual damages under ex-
<br />isting conditions of,'$B,090, 'arid the average annilaldamages under con-
<br />ditions rriodifiedby}lie, proposed p:r.arl;~f ~)550, or~\7,$40.
<br />t:,j::: :.'i.r, . .' . ....
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<br />"..4:-.9,2. Alqwanc~ for future develo meh:tl, ;. P:!'elimine:!'y figures
<br />released bY" lie Bureau. of th(;l ,Ceflsus reveal that the pdpulat*on of
<br />Trinidad decreas~d. from 1;3,22;3 to 12,206 during.. the period 1940 to 1950,
<br />and tuat the number of dwelling.. units. increased only sli@l'l:;l:y-from;3,644
<br />to J;655 during'th'e same period. This coupled with the fa~thatprllcti-
<br />cally' 'no vacant lano. exists in,the flood p~ail"l.indicates thaj:,deyelopment
<br />within the flood,.plain will r$main ratperstat:i.c during the~~oJect:'.life,
<br />therefore no inCrease in benefits .is made as ' all allowance fop, futlire
<br />development. " '.'(, :
<br />
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<br />4-0;3. Enhancement of lano. values. ;;',The value of land'tithin'the
<br />flood plain of, Pinon Canon l>r.royo has depreciated because..of ,.r~ceht'
<br />major flooo.s. Tp,e flood plain conta:l:ning:about 40 acres wl}:i.cl).,.on the
<br />basia of five city lots per;l.cre, amounts to 200 lots. It.1s ahtici-
<br />pat6<:l,.that the protection tha:t'will be affoT"tled by the pr,ojectwili re-
<br />sultin an increase in lapd -values of at lea~t~)200 per lo;t:" or ~p40,000,
<br />which 'at 6 percent, amounts't'o"~)2,400 anhually, The project is accord-
<br />ingly credited with an anriUal. benefit of this amount arising ffoln the
<br />enhancement of lano. values.
<br />
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<br />4-04. Total benefits. - The total annua:1beneifits, that will ~ccrue
<br />to the project ,upon its cdlppletion amount to $9;940, ~i' i-(~i;ch'~p7;.540 are
<br />f~om the prevention of floGlddamages; a,nd ~p2,400 are ,from:, the, ,:enhance-
<br />ment of land valUes. ""'\'" ,,,.,,';',.; ,,,,'.'
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<br />V - ECONOMIC Jt!STIFtbj,TION ,;
<br />
<br />5-01. Annual chargee.. .- The project annual ch~ges,. b~s(1d on a
<br />,Federal investment of ~i150,OOO amortized for 50 years at ;3 per'cent
<br />'; :interest, and a non-Federal investme1;lt"of ~~25,ooo amortized. for 50 years
<br />"..,..at,3~percent interest plus maintenance of ~i500;~ wouldanlount to ~\7,;395.
<br />These annual charges are sUlllIIlarized in table 4>-
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<br />Appendix III
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