Paper ID: 214
Developing a Groundwater Conservation Area Using Analytical Hierarchy Process in Randublatung Groundwater Basin
A Hartono1*, H Hendrayana2 and Akmaluddin2
1Magister Program of Geological Engineering, Universitas Gadjah Mada, Jl. Grafika No. 2 Bulaksumur, Yogyakarta, 552812Departement of Geological Engineering, Universitas Gadjah Mada, Jl. Grafika No. 2 Bulaksumur, Yogyakarta, 55281
Randublatung Groundwater Basin is a cross-regency Groundwater Basin located in Central Java with an area of 203 Km2. The increase of population in this area led to the increasing need for groundwater not only for fresh water sources / consumption, but also for agriculture and industrial needs. The rise of uncontrolled groundwater usage can result in pollution and degradation both in quality and quantity of groundwater so that there needs to be conservation efforts in order to maintain the sustainability of groundwater utilization. The purpose of this study is to determine conservation zones and management priorities in the Randublatung groundwater basin area. Conservation zones are determined based on the value of its parameters: (a) availability and potential of groundwater, (b) decrease in groundwater level, (c) aquifer characteristics, (d) changes in groundwater quality, (e) changes in groundwater environment, (f) prioritization of groundwater protection areas, (g) land use, and (h) groundwater use. Those parameters are weighed using the Analytic Hierarchy Process (AHP) method and then overlaid corresponding to the weight of the parameter to acquire the matrix of conservation zones. Groundwater sample were measured on 55 wells. The results indicates the type of lithology in the research area was an alluvial deposit. The result of the data processing is presented in the form of a map of groundwater. There are four types of conservation zones in a confined aquifer, i.e. secured, vulnerable, critical and damaged.