Weekly Rainfall Probability over Dry Farming Tract of Gujarat

Abstract

By fitting Incomplete Gamma Distribution week by week probability of rainfall amount at different levels (10 %- 90 %) has been computed for 81 stations in the dry farming tract of Gujarat. The analysis has brought out four distinct rainfall patterns and homogeneous rainfall zones over Gujarat. The specific amount of assured rainfall at different probability levels in various weeks are computed for different stations. No break condition is noticed in rainfall distribution in any part of the tract during the monsoon period at 50% probability level. High assured rainfall pockets are found around Junagadh, Rajkot and Palitana whereas an area of low assured rainfall comprising of Ranpur, Chuda. Dhandhuka and Dho1era is identified. Crop growing period on the basis of rainfall alone has been indicated for each zone.