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"A modification of the basin plan, as applied to ground with considerable slope and consisting of hillside land, wherein f m is the main ditch on the highest side of the field, of which b c d e mark the boundaries. Its surface slopes in the direction of the arrows; o o and q q are "check levees," or slight embankments, built on level lines around the curved surfaces of the field. A supply ditch, i j, leads the water into the 'checks' or basins b c, o o, and q q, etc., and t w l is a waste ditch for discharging the surplus water from the checks when no longer needed." -Department of Agriculture

Irrigation by Checks

"A modification of the basin plan, as applied to ground with considerable slope and consisting of hillside…