Installation of Deep Groundwater Wells as Solution to Water Resources Problem in Panggang Subsystem, Gunungsewu Karst Area, IndonesiaIndra Agus Riyanto, Ahmad Cahyadi, Dwi Sismoyo, Muhammad Naufal, Fajri Ramadhan, Margaretha Widyastuti and Tjahyo Nugroho AdjiE3S Web Conf., 125 (2019) 01009DOI: https://doi.org/10.1051/e3sconf/201912501009