"A modification of the basin plan, as applied to ground with considerable slope and consisting of hillside…
One way to spread water over a hillside field, "f m is the main ditch and the slope of the hill as shown…
"Irrigation by means of check levees for orchards on sloping hillsides (sectional view)." -Department…
"Irrigation by means of terraces on steep hillsides (sectional view)." -Department of Agriculture