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definitions methods of determination of runoff darcy’s law types of aquifers unit hydrograph – hydrograph of different durati consistency of rainfall record mean annual rainfall ground water movement evaporation and evapo-transpiration. runoff – fa s-hydrograph applications of unit hydrograph stream gauging. unit-ii: hydrograph analysis: base average depth of rainfall over an area unit–i: surface water hydrology: water resources sub surface distribution of water double mass curve measurement of rainfall flood forecasting techniques. ground water hydrolo infiltration – factors affecting and its determi hydrology in water resources planning –precipita