A catchment has four sub-areas. The annual precipitation and evaporation from each of the sub-areas area given below. Assume that there is no change in the ground water storage on an annual basis and calculate for the whole catchment the values of annual average i. Precipitation Evaporation ii. What is the annual runoff/rainfall coefficients for the sub-areas and for the total catchment taken as a whole? Area (Mm?) Annual ppt (mm) Sub-Area Annual Evaporation (mm) 530 A 10.7 1000 + R 3.0 900 - R 438 82 1000. R 430

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Laws of Equilibrium

A body is said to be in equilibrium if the system of forces acting on the body tends to keep the body at rest, in other words, there is no translation motion or net torque on the body. Under such conditions, the equilibrium conditions are to be applied to analyze the condition. The branch of mechanics that deals with this condition is known as 'statics'. Under equilibrium, there are no net forces on the body.