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One way to spread water over a hillside field, "f m is the main ditch and the slope of the hill as shown by the arrows; t o, r p, and s q are small ditches or plow furrows cut on a level line around the face of the hill. The water is let into the field by the short ditch at i, and is then spread over the space b c t o by means of a marginal ditch y z, from which it is made to flow in small streams and in a regular manner over the space between it and the lower ditch t o." -Department of Agriculture

Irrigation by Furrows

One way to spread water over a hillside field, "f m is the main ditch and the slope of the hill as shown…