HR: 1400h
AN: H53E-02    [Abstracts]
TI: Ground Water Recharge Estimation Using Water Table Fluctuation Method And By GIS Applications
AU: * Vajja, V
EM: varasays@yahoo.co.in
AF: Centre for Water Resources, IST, JNT University, Kukatpally, Hyderabad, A.P 500085, India
AU: Bekkam, V
EM: cwr_jntu@yahoo.com
AF: Centre for Water Resources, IST, JNT University, Kukatpally, Hyderabad, A.P 500085, India
AU: Nune, R
EM: rajeshnune@gmail.com
AF: Centre for Water Resources, IST, JNT University, Kukatpally, Hyderabad, A.P 500085, India
AU: M.V.S, R
EM: cwr_jntu@yahoo.com
AF: Centre for Water Resources, IST, JNT University, Kukatpally, Hyderabad, A.P 500085, India
AB: Quite often it has become a debating point that how much recharge is occurring to the groundwater table through rainfall on one hand and through recharge structures such as percolation ponds and checkdams on the other. In the present investigations Musi basin of Andhra Pradesh, India is selected for study during the period 2005-06. Pre-monsoon and Post-monsoon groundwater levels are collected through out the Musi basin at 89 locations covering an area11, 291.69 km2. Geology of the study area and rainfall data during the study period has been collected. The contour maps of rainfall and the change in groundwater level between Pre-monsoon and Post- monsoon have been prepared. First the change in groundwater storage is estimated for each successive strips of areas enclosed between two contours of groundwater level fluctuations. In this calculation Specific yield (Sy) values are adopted based on the local Geology. Areas between the contours are estimated through Arc GIS software package. All such storages are added to compute the total storage for the entire basin. In order to find out the percent of rainfall converted into groundwater storage as well as to find out the ground water recharge due to storageponds, a contour map of rainfall for the study area is prepared and areas between successive contours have been calculated. Based on the Geology map, Infiltration values are adopted for each successive strip of the contour area. Then the amount of water infiltrated into the ground is calculated by adjusting the infiltration values for each strip, so that the total infiltrated water for the entire basin is matched with change in Ground water storage, which is 1314.37 MCM for the upper Musi basin while it is 2827.29 MCM for entire Musi basin. With this procedure on an average 29.68 and 30.66 percent of Rainfall is converted into Groundwater recharge for Upper Musi and for entire Musi basin respectively. In the total recharge, the contribution of rainfall directly to Groundwater recharge is 8.53 and 8.81 percent and the remaining 21.15 and 21.85 percent is due to groundwater recharge from water conservation structures such as check dams, contour bunds, tanks, etc. for Upper Musi and for entire Musi basin respectively. The difference is attributable to the canal recharge in the case of Lower Musi. Therefore the Upper Musi values may be taken as a percent of Rainfall that is converted into Groundwater recharge.
DE: 1829 Groundwater hydrology
SC: Hydrology [H]
MN: 2007 Joint Assembly