Abstract
Floods and droughts in Purworejo regency are an indication of problems in groundwater management. The current development progress has led to land conversion which has an impact on the problem of water infiltration in Purworejo regency. This study aims to determine the distribution of groundwater recharge potential zones by using geographic information system as the basis for ground water management. The groundwater recharge potential zone is obtained by overlaying all the thematic maps that affect the groundwater infiltration. Each thematic map is weighted according to its effect on groundwater infiltration such as land-use - 25%, rainfall - 20%, litology - 20%, soil - 15%, slope - 10%, lineament - 5%, and river density - 5% to find groundwater recharge potential zones. The groundwater recharge potential zones thus obtained were divided into five categories, viz., very high, high, medium, low and very low zones. The results of this study may be useful for better groundwater planning and management.
Highlights
Ground water is the amount of water beneath the earth's surface that can be collected with wells, tunnels or drainage systems or by pumping
Geographic Information System (GIS) approach were employed in this study to delineate the groundwater recharge potential of Purworejo regency based on time and cost effectiveness [10]
Weighting for identification of groundwater recharge [potential zones has been done by many researchers using geographic information systems
Summary
Ground water is the amount of water beneath the earth's surface that can be collected with wells, tunnels or drainage systems or by pumping. While another study concluded that by 2025 the number of districts with water deficits increased by 78.4 percent with deficits ranging from one to twelve months, or deficits throughout the year This means that water availability in Purworejo regency needs to serious attention to its conservation. The absence of a comprehensive groundwater recharge potential zone map in Purworejo Regency has resulted in the development program not considering the catchment area as an area that should be protected and conserved as part of groundwater conservation. Groundwater recharge area is the area where the rain water infiltrated into the soil which becomes ground water. Some steps taken to obtain the groundwater recharge potential map are: (1) identification of thematic map that influences groundwater infiltration. (2) weighting and scoring on each thematic map. (3) a thematic map application with a GIS program for spatial mapping
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