Wetlands are found in the area where a hydrological regime occurs. Its ecological character depends on spatial and temporal variation of water depth, flow patterns, water quality as well as the frequency and duration of inundation. Some wetlands like the coastal wetland and the marine wetland are often highly dependant on inputs of freshwater. The integrity of wetland ecosystems is prone to human modifications (such as abstraction, storage and diversion of water for public supply, agriculture, industry and hydropower). In this way water is an integral part of the wetland ecosystem.