Abstract
Lumajang Regency government plans to optimize water resources using Mrutu Spring groundwater as a water source for the Drinking Water Supply System (SPAM). The maintenance of the groundwater quality and quantity sustainability is necessary to delineate the protection zone of Mrutu Spring. Geological, hydrogeological, and land use parameters assessed the spring protection zone. The Mrutu Spring protection zone determination was conducted using manual and analytical solutions and combination hydrogeological methods. This study finds that the protection zone of Mrutu Spring is around Mrutu Spring up to Mrutu Spring groundwater recharge in the northwest. Mrutu Spring protection zone is divided into protection zone I, II, III, and groundwater recharge for the spring protection zone. The geometry of protection zone I is a circle with a radius of 1.64 km and 314 m2. Protection zone II is in the fifth circle with a 1.64 km and 2.87 km2. Protection zone II has an ellipsoidal shape with a radius of 16.74 km and 67.28 km2. The groundwater recharge for the spring protection zone is oval, with a radius of ± 12 km and 57,85 km2.
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