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Show 'Drainage of Irrigated Land ; Injury wrought by over irrigation manifests Itself In several ways and many places throughout our stato. Drainage is the moans of reclaim ng thoso lands. I Tho U. S. Department of Agriculture Agricul-ture havo issued bulletin No. 190 dealing with tho subject of Tho Drain age of Irrigated Land. It was written by It. A. Hart, Supervising Dralnago j Engineer. Mr. Hart in his bulletin goes Into tho problems of drainage, outlining how work should be enr-ried enr-ried on and tho different methods to bo used. I That tho dralnago of agricultural lands Is an Important factor in tho future development of tho Irrigated (section Is shown In tho alarming proportion pro-portion of tho lands that havo been brought under Irrigation wh ch aro now unproductive by reason of water logging and alkali. Tho reclamation of these lands can eas ly nnd economically econo-mically bo offected by drainage, followed fol-lowed by proper cultivation, cropping, and Irrigation. i Tho spoclflc results which It is proposed to accomplish by draining are outlined In tho bulletin as fol- . lows: I 1. To lower tho ground water ta-bio ta-bio to such a depth that the moisture and air conditions within tho root zone aro properly balanced. i 2. To provide an outlet for percolating perco-lating water, so that fluctuations of tho ground water tablo wlth'n tho root zone will bo provented. 3. To effect rapid removnl of tho thaws. 4. To provide an outlet for the downward moving water used to dissolve dis-solve out tho Injurious salts. Farm drainage systems aro designed design-ed upon tho supposition that natural dralnago outlets exist or that nrtlfl-c'al nrtlfl-c'al outlets will bo available. Tho cost of draining ordinary sized siz-ed farms having nn nvcrago soil that is neither so hard as to require picking pick-ing nor so soft that extremo trenching trench-ing difficulties will bo encountered, will range from $10 to 20 per aero with tho avorago between $11 and $15 per ncro. |
