IMPLEMENTATION OF ARTIFICIAL STORAGE FOR FLOOD MANAGEMENT IN WELANG WATERSHED, PASURUAN DISTRICT

Welang Watershed (DAS) based on Presidential Decree number 112 of 2012 is included in the Welang Rejoso River Basin and administratively this river is a cross river between Pasuruan City, Pasuruan Regency and Malang Regency so that the management of the Welang river becomes the authority of the Government of East Java Province The Welang River is a first order river with 21 tributaries having a total watershed area of 509.50 km2 and a length of approximately 53 km with the characteristic shape of the river meandering and the shape of the watershed widened in the upstream and topography so that it often causes flooding in the downstream area As a result, the existing transportation routes are often disrupted. The concept of handling floods that are environmentally friendly by storing them in the ground at a place called an aquifer by using the Artificial Storage Recharge (ASR) method what if this method is implemented to deal with floods that occur at welang times. The results show that the watershed watershed is possible to be overcome by using artificial recharge storage, but because the quality of the river water is polluted, it needs to be treated first before it is included as a source of artificial recharge storage water