Hydrogeological characteristics of the shallow subsurface and ground atmospheric conditions in Khao Chet Luk and adjacent area, Changwat Phichit

Abstract

A 766.136 sq.km. area at and around Khao Chet Luk, Changwat Phichit was studied for the hydrological characteristics. Without sufficient climatological stations and hydrological gauge stations available in the study area, the Theissen polygon was used to estimate areal rainfall and climatology data from the year 1975 to 2000. This is to estimate the water balance during that period. The water balance was calculated using rainfall data as the input and the evaporation, transpiration and ground infiltration as the output with the remaining-water surface flowage or storage being result. Water budget is indicated by the amount of the surface remaining-water in year 1975-76 which in the rainy season was 108.797 x 10[superscript 6] m[superscript 3] surplus,and in the dry season, 489.945 x 10[superscript 6] m[superscript 3] deficit. In year 1988-89, the rainy season was 13.536x 10[superscript 6] m[superscript 3] surplus, the dry season was 524.228x 10[superscript 6] m[superscript 3] deficit. In year 2000-01, the rainy season was 132.676x 10[superscript 6] m[superscript 3] surplus and in dry season was 485.608 x 10[superscript 6] m[superscript 3] deficit. The study indicates that in this area the water will be enough for the household and agriculture usages in the rainy season. The problem will be an extremely short of water in the dry season. This area needs a good planning for the water budget management for a year- round demand.