Generation Of Monthly Irrigation Maps For
India Using Spatial Interpolation Techniques
Author(s)
A. Bhadra, N. S. Raghuwanshi & R. Singh
Abstract
Considering the current water resources problems and rapid increase in its
demand, the importance of effective utilization of water resources cannot be
underestimated if India has to remain self reliant in food production. Point ETc
(crop evapotranspiration) can be calculated by multiplying point ETo (reference
evapotranspiration with appropriate kc (crop coefficient) values on a monthly
temporal scale. Subtracting the monthly point effective rainfall values from
corresponding monthly cumulative point ETc, the point net monthly irrigation
requirements can be estimated. Spatially interpolating the point net monthly
irrigation requirements by kriging, monthly net irrigation requirement (NIR)
maps can be generated. Such maps, although readily available for most of the
developed countries, have not yet been developed for developing countries like
India. This kind of readily available standard net irrigation requirement maps can
be very useful in obtaining reliable irrigation demands in new areas. Therefore,
in this paper, an attempt has been made to develop monthly net irrigation
requirement maps for India. To grasp the spatial distribution characteristics of
the net irrigation requirement for the dominant crop of the season and agroecological
region (AER), geostatistical analysis was performed on the normal
monthly NIR derived from 32 years (1971-2002) data of 133 IMD (India
Meteorological Department) stations uniformly distributed over the country. It
was observed that ordinary kriging produced best results and hence was used to
produce the final net monthly irrigation requirement surfaces for all the months.
Keywords: net irrigation requirement, geostatistics, spatial interpolation,
ordinary kriging, agro-ecological region.
Keywords
net irrigation requirement, geostatistics, spatial interpolation,
ordinary kriging, agro-ecological region.
Related Book
Other papers in this volume
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