Gallery well application as a media for water treatment in flooded areas (case study: Morowudi Village, Gresik Regency)

Abstract

High-intensity rainwater is known to cause flooding in Morowudi Village, Gresik Regency. This is a major issue for the local community because flood-related to water quality degradation renders it unfit. This study aims to apply gallery wells made as an alternative media to treat floodwater with better-quality water in Morowudi Village, Gresik Regency. In this research, there are two media variations: silica sand or building sand with a diameter of 0.2–0.4 mm applied in the form of a reactor with a diameter of 0.8 meters and a media thickness of 60 cm, which used a separation technique. The separation technique mechanism of the gallery well is SSF (Slow Sand Filtration). The floodwater percolates slowly through a gallery well reactor, with the influent water penetrating from the outside reactor and congregating in the wall as the effluent. The effectiveness of artificial gallery well application is measured by the reduction percentage of TDS, total turbidity, and total coliform. The results showed that artificial gallery well application reduces of TDS, total turbidity, and total coliform in floodwater at Morowudi Village. Thus, it can be used as usable water for the local community.