Rainfall is the main source of water in Orissa that varies from 1200 millimeters to 1700 millimeters across the state. The average rainfall in Orissa is measured as 1482 millimeters (equivalent to about 230.76 billion m3 of water). Orissa receives about 78% of rainfall between the months of June and September: Orissa receives the remaining 22% of the rainfall throughout the year.
An estimate of the total precipitation in Orissa is given below:
Moreover, Orissa is known to possess an extensive network of streams and rivers. The average annual availability of surface water resources in Orissa, according to a survey, is 120.397 BCM. The total amount of water that is generated from the rivers and streams of Orissa is about 82.841 BCM: inflow from the neighboring states generate about 37.556 BCM. The study reveals that about 75% of the annual flow is utilized in Orissa.
Furthermore, the natural recharge of the ground water in Orissa results through the percolation of rain water. According to the survey of 2001, the total amount of replenishable water is about 21.011 BCM. Out of the 21.011 BCM of ground water resource, about 60% is usable and safe. But it is noteworthy that the amount of ground water is decreasing rapidly, owing to the increase in the population.
To know more about Orissa water resources, click on the given links:
