Water treatment 2. Not only average water demand but also fluctuations in water demand are important for water supply planning purposes.
Fluctuations occur on yearly, seasonal, daily and hourly basis.
Demand projections are function of domestic water use habits population change industrial and agricultural water usage 2.3 Surface Water Hydrology Hydrologic analysis tools are important in the design and operation of reservoirs, stormwater systems, and irrigation systems. These systems are used in water supply, flood control, hydroelectric power, irrigation, navigation, preservation of aquatic life, and recreation.