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HYDROLOGY - BASIC CONCEPTS

HYDROLOGY - BASIC CONCEPTS HYDROLOGY is the science of the waters of the earth and its atmosphere. It deals with occurrence, circulation, distribution and movements of these waters over the globe and their interaction with the physical and biological environments. HYDROLOGY 2 The Water Cycle 3 Engineering HYDROLOGY is the branch of HYDROLOGY which deals with estimation of water resources and related hydrologic quantities. It also investigates hydrologic problems such as floods and droughts, and develops strategies to mitigate them. Engineering HYDROLOGY 4 Floods & Droughts 5 The need of the hydrologic studies arises from the following problems: Uncertainty of precipitation and its seasonal occurrence Seasonal flow of rivers, and Population growth and rising standards of living Need for the Hydrologic Studies 6 7 In many countries water is the main source of energy and the

total runoff i. e. it is sum of all the components of precipitation water. Direct runoff plus the losses gives total runoff. The runoff can be expressed in depth units for a certain area or it can be expressed in volume units. It can also be expressed in discharge units for a specified time. Hydrologic Cycle 35 Continued….

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