Temporal, Seasonal and Spatial Rainfall Analysis of Dindi Reservoir catchment area using GIS, Mahabubnager and Nalgonda Districts, Telangana, India

Dr. K. Krishnakumar; Dr.B.Linda Prabhakar babu

Volume : VII, Issue : IV, April - 2018

Temporal, Seasonal and Spatial Rainfall Analysis of Dindi Reservoir catchment area using GIS, Mahabubnager and Nalgonda Districts, Telangana, India

Dr. K. Krishnakumar, Dr. B. Linda Prabhakar Babu

Abstract :

Rainfall data of 16 years from the 6 rain gauge stations covering the Dindi river basin such asMidjil, Kalwakurty, Vangur, Uppununtala, Achampet and Balmurmandal were used in this study.Average rainfall over the thirteen years is 613.2 mm. Average highest rainfall i.e. 796.4 mm recorded at Kalwakurthy and lowest rainfall i.e. 529.5 mm received at Vangoor. Over the thirteen years highest rainfall recorded in 2005–06 at Kalwakurthywhere as lowest found in 2004–05 at Balmoor. Annual rainfall trend of the study area indicating that decreasing trend was showed in Achampet, Uppunuthala, Midjil, Kalwakurthy, Talakondapalli and Vangoor stations; and increasing trend was evidenced in Balmoor station only. The analysis proved that average monthly highest rainfall in south west monsoon season was received in September, in north east monsoon highest rainfall was experienced in October month and April was the highest rainfall recorded month in summer. Annual rainfall departure is ranged from 48.2% in 2011–12 to 95.9% in 2005–06. 2004–05, 2006–07, 2011–12 and 2015–16 were the drought years in the study area which was received below 75% of the normal rainfall.During south west monsoon highest rainfall (760.8 mm) was received in 2005–06 and lowest was (240.8 mm) received in 2011–12. North east monsoon in 2013–14 highest rainfall (386 mm) as well as lowest (23 mm) was received in 2011–12. In winter only in 2012–13, 22.9 mm and in summer highest rainfall was 156.7 mm of rainfall was recorded. Of the total annual rainfall 71% of the rainfall was recorded in south west monsoon; 20% was received in north east and remaining 9% was received in summer. Spatial distribution of the average annual rainfall, south west, north east and summer seasons over the period of thirteen years shows that central and extreme north of the area received less than average rainfall and remaining area has more than average rainfall.