Need of water harvesting on the basis of rainfall probabilities analysis in different districts of Chhattisgarh, India

摘要

The initial and conditional probability of rainfall, i. e. probability of wet P(W) and conditional probability like P (W/W) at 10 mm, 20 mm and 50 mm per week was worked out for the four districts of Chhattisgarh (Raipur, Bilaspur, Jagdalpur and Ambikapur) and results are interpreted. There are locational variations of getting wet week. In later part of the monsoonal season which is coinciding with the end of September, the probability of getting a wet week is very less in all the locations which areindicating the uncertain factor of rainfall in rainfed rice production. This is indicating the importance of medium range weather forecast and operational management for different crops grown in the state. This is only one technique and integrated therapy and techniques are the need of hour to make a balance with the ever-increasing need of food production. Further stress has been made to conserve surplus monsoonal rainfall in On Farm Reservoirs (OFR's) as rainfall is occurring in intense storms and utilize this rainwater for sustainable crop production and also for enhancing cropping intensity. The high potential of OFR's and other harvesting structures in alleviating drought, increasing productivity and stability of rainfed rice lands has been tested in this region for meeting this challenge of rainfed rice production.