Introduction

Ravine: A small, deep, narrow valley with steep sides, larger than a gully smaller than a canyon.
Check Dam: It is a structure built across a river or estuary in order to restrain or use water.
Gully: It is a water-made cutting, usually steep-sided with flattened floor.
River Basin: The total area drained by a river and its tributaries.
Perennial Canals: Canals that have water all the year round.
Groundwater: Water which is obtained from a depth of more than 15 metres.
Surface Water: Water found accumulated on the surface of the earth in depressions flowing through rivers, streams or frozen in the form of icecaps and snow fields.
Multipurpose projects: The project which serves more than two purposes are called multipurpose projects.
Water Fall: When in the middle of a river-course water falls from a great height into lower course.
Potential Water Resources: The total amount of water resources which can be developed for useful purposes.
Developed Water Resources: Developed water resources constitute the portion of the total water resources which have actually been harnessed or developed.
Water Harvesting: It is a method of collecting rain water on rooftops and then channeling it to augment the groundwater shortage.
Watershed: It is a physiographic unit which is used for integrated development of small natural unit areas.
Wetland: The low lying marshy or water logged area.