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Show Terraces Will Control Drainage of Lowlands Much of the poor drainage In rolling areas of farm lands in the Middle West will be controlled or reduced automatically when the lands are properly terraced, says A. T. Holman, agricultural engineer engi-neer at the federal soil erosion farm, at Bethanay, Mo. Good systems sys-tems of terraces frequently reclaim re-claim 10 to 20 per cent of low wet areas and at the same time save nine-tenths of the erosion losses on rolling highlands. Unterraced watersheds permit the run-off from higher lands to flow over low-bottom lands. If the water does not form guillies In the bottoms, It may make scepy swamps or. bogs out of them. Terraces Ter-races check and distribute the tlow of water from the hill land and 'permit 'per-mit the soil to absorb as much as it needs. The surplus, In wet seasons sea-sons or from exceedingly heavy rains Is conducted along terrace channels to outlets and does not run down the hillside in gullying torrents. tor-rents. In checking and distributing the flow of water, terraces with broad, flat, or slightly rounded drainage channels are most effective. The bottom water channels may be made In the form of a narrow U, but should not be sharp V shape. |