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<br />-. <br />I <br /> <br />l-G.h) " <br /> <br />(Project lands) <br /> <br />the river. in which Case the slope is usually toward the tributarios. <br />Throughout tho urea large bodies of land lying in 000 pIano with gentle <br />uniform dopes are found. These areas present a topography which is <br />idelll for irriglltion development. On the new land Which would benefit <br />f'ran potential irrigo.tion development the cost of proparation, includ- <br />ing land leveling, and rellloval of rocks and vegetatien, would be rel- <br />atively lcw. <br /> <br />Drainal!;e <br /> <br />I~~- <br /> <br />Drllinage byll\OllnS of which unoonsurncd water Ill!l.Y be carried off the <br />surface and out of the subsoil is supp-lemontoJ. to irrigo.tion._lt_mj.g_h!, <br />. -~soem-=-tlie.t~ideo:l-irri:g.ti'6n"wou'J:.d:-o.on.si.st cjf applying oIlJ.y-t~aLqUll"-~~ ty <br />,. , -=of'wo:~r_-_vlliTch:co.!,il-[i~,bO:::...s_cd J;y~i;hc~gr,Owingc:orops_ undlos,t ;rr.om';.tllo~sUr- <br />-=--=fO:c-o'=oCtho soi1.:by:'iVip-:;'rution._-=SJ!OI1-->J:.-,!ystom, ,o:von if poillii:blcr:!,ould <br />. ~:. riot b-b.:'Cfesi;.rE_1illi-:on ::ti!o: E.istern~31ope;;becC:use..bottF water o.zl<!.C!~pi'l:iPcffn__ <br />=- :--:;:tnfn: ill1puri tios::wlUc.homus,t=oo"-co;rrled"aow!iivo.:'d' mid out !>y d_rain.!!go~"-- <br />. wa.tcri-- - ---- --- - - - -- - - -- - <br /> <br />. <br /> <br />Continued uso of irrigationwuter results in the downward movement <br />of tho wator until it reachos an impervious substratum, along the sur- <br />face of which it moves into the 10ller-lying aroas. .\ihere the impervious <br />substratuz he.s but a shallow Covering of soil, seepod and alkali areas <br />dovelop. A saturated soil excludes tho air, roots cease to function, <br />and most cultivated plants eventually die. <br /> <br />, <br /> <br />.1 <br /> <br />Surfaeo drainage for nearly tho entiro areo. is good. A relatively <br />small area in Crowley County, surrou.ding i.!orodith, Holbrook, and <br />Cheraw Lakes consists ef closed 'rosins where flat topography pre- <br />vents good surface drairngo. <br /> <br />Most of the o.lluviul soils have good subsoil drainage crAracter. <br />istics. Some of the river bottomland. whero u high....uter table is <br />mainto.ined with water frar. the river, presents drainnge problems even <br />though the soil is porous. <br /> <br />e---- <br /> <br />The future extent and canplexity of the druinage problems on the <br />residual upland soils are difficult to anticipate without mOTe inton- <br />sive inveatigution than is made in reoonnaissance surveys or oven somi- <br />detailed survoys. No lands h"ve been classed as irri go.ble whore tho <br />depth of tho seil OVer an impervious layer was considored to be too <br />shallow for effective drainage. No lands ~ve been classod as irri- <br />gable where tho subsoil texture and alknlinity indicated that futuro <br />drainage problems would bo more thun moderate in oxtent and effoctive_ <br />- -p.eJls,._ _ _J:ud. gmant.-bc.sed-solely-on-thes9-points-o.rone- 'may prove err oneous~-. - - --- <br /> <br />9 <br />