Irrigation and drain, artificial application of water to land and artificial removal of excess water from land, severally. Some land desires irrigation or drain before it’s potential to use it for any agricultural production; all altogether utterly totally different land profits from either apply to extend production. Some land, of course, doesn't would love either. The' either apply might even be, and each generally unit of activity, used for non-agricultural functions to spice up the setting, this text is tabu to their application to agriculture. Irrigation and drain enhancements don't seem to be primarily reciprocally exclusive. Generally each might even be needed on to assure sustained, high-level production of crops. The first consideration in planning an irrigation project is developing a water supply. Water supplies may be classified as surface or subsurface. Though both surface and subsurface water come from precipitation such as rain or snow, it is far more difficult to determine the origin of subsurface water. In planning a surface water supply, extensive studies must be made of the flow in the stream or river that will be used. If the streamflow has been measured regularly over a long period, including times of drought and flood, the studies are greatly simplified. From streamflow data, determinations can be made of the minimum, maximum, average daily, and average monthly flows; the size of dams, spillways, and downstream channel; and the seasonal and carry-over storage needed.