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-. I I~~- . l-G.h) .. (Project lands) the river, in which Case tho slope is usu~lly teward the tributo.rios. Throughout tho area large bodios of land lying in OM pl~ne with gentle uniform slopes are found, These G.re~s present 0. topography whioh is ideal for irrigation development. On the new land Which would benefit fran potential irrigation development the cost of prop~r~tion, inolud- ing l~nd leveling, and remov~l of rocks and vegetation, would be rel- atively lcw. Drainal!;e Drainage by moans of which unconsumed wo.tor may bo carried off tho surface o.nd out of the subsoil is supp-lemcntol to irrigation. It_mig_h!, . -~soem.:.tliat~ideo:l-irri:g.ti'6n"Wou'J:..d:-o.on'li.st of applying oil1y-t~o.t=-CjWi,,-~~ ty ,. . -=oi"wdtor_-.vlliTch:c o.!,i1-[i~.bO:::...scd J;y~i;hc~gr,Owingc:crops_ and los.t ;rr.om-;.tllo~iur- .-=--=fn-c-o'=.5rtho soiJ::by: iVip-:Or~tion.. .-: SJ!O 11.- >,:.:'!ystom,o'lon if poillii:blOrJlculd .=:.. nc,t _b~.:;fcsi;.rE.1ila:-:on::tI!o::Etistern-'31opo~becC:us o. .both' wo. tor o.n-<!.C!~pi'l:iPcffn-. u::-:--:;:tnin ililpuritio.o.wliic.homus.t=be-:-currled'-'QowIltvo.rd' mid out !>y d.rain.!!go:::._-- . wa.tcr.-- - ---- --- ---- - .-- - Continued uSo of irrigation water results in tho downward movement of tho w~tor until it roachos an impervious substratum, along tho sur- face of which it moves into the lOllor-lying tU'ens. .\ihore the impervious substratuz hv_s but ~ shallow eovering of soil, seepod ~nd alkali are~s dovelop. A satur~tcd soil excludes tho nir, reots cease to function, and most cultivated plants oventually die. , .1 Surfo.eo dr~inago for nearly tho entiro o.rc~ is good. A relatively small area in Crowley County, surrou.ding i.!orodith, Holbrook, and Chero.w Lakes consists of c1osod 'rosins whoro flat topography pre- vents good surfo.oe drairngo. Most of tho alluvial soils have good subsoil dr~inago crAraotor. istics. Some of tho river bottomland, whoro a high....ater table is maintained with wator frar. the rivor, presents dr~ino.ge probloms even though tho soil is porous. The future extent and canplexity of the drainage problems on the residual upland soils ar e difficult to antic ipate without mare inten- sivo inveatigation than is made in reeonnaisso.noe surveys or even semi- dot~iled survoys. No Innds h"ve been classod as irri gablo whorc tho depth of the soil ovor an impervious layer WOos considered to be too sh~llow for offoctive drainage. No lands have boen elo.ssed as irri- go.ble whore tho subsoil texture and ~lkn1inity indicated tho.t futuro drainage problems would be more than modor~ te in extont and ef'fective_ - .1l.OJlS.... _J:ud gmant.-bc.sed-solely-on-theBo-points-o.J:one- .may prove err oneou8~-. - - --- ..---- .--- 9