Groundwater Modeling for Managed Aquifer Recharge (MAR) Planning in Ban Nonsamran, Nikhom Sang Ton Eng Lam Dom Noi Sub-district, Sirindhorn District, Ubon Ratchathani Province

Abstract

Groundwater modeling was applied in Ban Nonsamran, Nikhom Sang Ton Eng Lam Dom Noi Sub-district, Sirindhorn District, Ubon Ratchathani Province to support the Managed Aquifer Recharge (MAR) system planning. The MAR system was planned in 4 types of recharge wells and recharge pond including; (1) one cubic meter recharge well, (2) 0.6 m recharge well with 2 m depth (3) 0.6 m recharge well with 5 to 12 m depth, and (4) recharge pond with 24-41 m width, 40 to 54 m length, and 7-12 m depth. The information of climate, land used, hydrology, hydrogeology were analysed together with the field investigation data such as soil and rock profiles. The groups of observation well were installed and monitoring for water level of groundwater. The hydraulic properties of soil and aquifers were test by infiltration test and pumping test. The hydrogeological conceptual model and numerical model were developed using MODFLOW model. The results from model projection scenarios showed that at 1, 5, and 10 years after MAR system installation, the volume of groundwater recharge will be increased 4,998, 183,063 and 137,841 m³ from normal condition, respectively. Moreover, the groundwater level will be increase in the range of 3.95 to 12.01 m from baseline.