18-Moisture inflow over India and its contribution to rainfall during normal, good and bad monsoon years.

Abstract

Conventional methods to derive a reasonable water budget for any region are normally based on the observations of various hydrological parameters viz. precipitation, evapotranspiration, run-off, subsurface storage etc.However, because of limited observing stations and other difficulties in taking the observations of some of these parameters, specially evapotranspiration and changes in storage etc., a different dynamical technique, as suggested by Benton and Nyberg using "Hydrological Balance Equation", is used to compute the following, using the data of 10 years comprising of normal, good and bad monsoon years

i) total monthwise inflow of moisture into the country during these years (for monsoon period).

ii) the contribution of this inflow moisture to the monsoon rainfall i.e. its percentage efficiency.

iii) total monthwise evapotranspiration in the country during these years (for monsoon period).

The monthly averaged aerological data Radiosonde) from surface to 500 hpa(millibar) level have been used for this work.