What is watershed achievement?
A watershed is defined as the land area drained by a river and its tributaries. It is used to define the surface water drainage boundary. The concept of watershed originates from surface hydrology where a river is assumed to be affected primarily by its surface drainage area. In fact, both surface and subsurface hydrology define a river and the importance of subsurface hydrology should not be overlooked. For instance, river baseflow is supplied primarily by ground water. However, it is generally assumed that the subsurface watershed be similar to the surface watershed. we have now recognized that water management has many other objectives such as water quality, ecological health, terrestrial and aquatic resources, etc. In order to manage our water resources effectively, we should apply an ecosystem approach in water management. The logical sequence of water management planning should be watershed plans, subwatershed plans, and site plans and these plans should be integrated with munici
