The design principle of water harvesting structures is similar to other hydraulic structures requiring wide range of input. In many regions of local thumb rule are used for designing the structures. For hydrologic design a more or less universal criterion is followed which is basically, ― the ratio of the catchment area to the cultivated area. The failure of such structures is mainly due to insufficient hydraulic capacity and lack of provision for dissipating energy of falling water into the structure. That is why, design of these structures is done considering not the discharge...