1Subject Matter Specialist, ICAR-KVK, Port Blair (Andaman and Nicobar Group of Islands)
2Professor, Department of Soil and Water Conservation Engineering, CAET, OUAT, Bhubaneswar (Odish)
3Professor and Head, Department of Soil and Water Conservation Engineering, CAET, OUAT, Bhubaneswar (Odisha)
4Professor, Department of Soil and Water Conservation Engineering, CAET, OUAT, Bhubaneswar (Odisha)
ICAR-KVK, Port Blair (Andaman and Nicobar Group of Islands)
*Corresponding Author's Email: er_bijaya@yahoo.co.in
Online published on 7 March, 2019.
The rainfall data for 40 yr from 1978 to 2017 of the rainfed tropical islands of South Andaman district of Andaman and Nicobar group of islands were analyzed to find out the weekly effective rainfall. Weekly and monthly effective runoff was calculated by following the US Soil Conservation Service-Curve Number (SCS-CN) method. The value of weekly effective rainfall and monthly effective runoff at different level of probabilities was obtained with the help of ‘FLOOD’ software. The sum of effective rainfalls of standard meteorological weeks from 18th to 48th gives the value of fresh water resource availability during kharif season and the same value at 80 percent level of probability was estimated to be 2.07 X105 ha.m. The sum of expected runoff of every month resulted due to the effective rainfall gives the water resource availability during rabi season and its value at 80 percent level of probability was found to be 4.8 X 103 ha.m. All these information will immensely help the farmers, policy makers, planners and researchers to prepare a comprehensive crop action plan for the South Andaman district to make the agriculture profitable and sustainable.
Curve number, Effective rainfall, Fresh water resources, Storage capacity, Tropical islands
