TITLE:
Irrigation Demand VS Supply-Remote Sensing and GIS Approach
AUTHORS:
Ch. Ramesh Naidu, M. V. S. S. Giridhar
KEYWORDS:
GIS, Water Users Association, Evapo-Transpiration, Remote Sensing, Irrigation
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.4 No.1,
January
8,
2016
ABSTRACT: To
determine the irrigation requirements of rice crop on different soils, an
integrated approach is used using Remote Sensing and GIS techniques. Depending
on the type of soil, climate and the crop acreage, the water requirement for
paddy fields is derived. This study is focused on estimating the water demand
for rice crop in Rabi season. Crop evapo-transpiration and soil percolation
losses account more in rice fields especially in hot climate like Rabi season.
In addition to evapo-transpiration and percolation losses, the conveyance
losses are also accountable in the case of unlined canals. Satellite data is
used to estimate the rice and fallow lands. In conjunction to satellite
interpreted data, climate and soil data are also integrated in GIS platform.
CROPWAT model is used to determine the crop evapo-transpiration (ETc).
There are 11 Water User’s Associations (WUA) in the command area and under
which 13 canal blocks are delineated. These blocks are again delineated in to
212 sub blocks. This study indicates that there exists a 5% to 20% of water
deficiency in some WUAs and also water surplus in some WUAs varying from 15% to
40%.