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The Hydrological Cycle And Water Budget Equation

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Streamflow is one of the essential components to understand the hydrological cycle and water budget equation in earth system. Climate change can affect the streamflow in many ways. Periodic increases in winter and early spring streamflows as well as higher frequency of intense storms will produce increase amount of streamflow in river channels (Miller et al., 2003; Jha et al. 2004). Land use land cover change also affect the base flow and peak flow which can cause flash flood in urban areas (Rose and Peters, 2001, Shulenberger et al., 2008, Wang and Cai, 2009). On the other hand declination of snow pack and increases in the frequency and extent of droughts will reduce annual streamflows. In addition, some plants and animals (such as fish that migrate) depend on a particular pattern of streamflow as part of their life cycles (EPA, 2014). The measurement of quality and quantity of streamflow is important for various purposes. Reliable streamflow information is needed for flood warnings and forecasts, irrigation withdrawals, wastewater discharges and reservoir releases, preservation of aquatic habitats, water quality standards, infrastructure designs for bridges, dams, and levees and for scientific investigations of climate change impact on hydrological components (USGS, 2013). Stream temperature is an important variable affecting many in-stream processes such as leaf decomposition and invertebrate life history (Webster & Benfield 1986, Sweeney 1984, Paul and Meyer, 2001). In

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