Analysis of Infiltration and Runoff Using KINEROS Model in Kali Genteng Sub-catchment, Malang

The Kali Genteng sub-catchment is located at the upstream of the Lesti Watershed in Malang Regency. It is one of the important sub-catchment, mainly for being source of inflow for the Sengguruh Dam, on the other hand, it also become the source of loads of sediment into the Sengguruh Reservoir. Land use changes within the sub-catchment by clearing land for expansion of residential areas as well as for the addition of agricultural land causes a rapid reduction of forest areas which are able to absorb water (pervious) into impervious watershed areas. Runoff measurements in a sub-catchment or watershed directly in the field is still rarely found because the cost are realistically large and require considerable amount of time. For research and reference of runoff data there has to be an appropriate model approach and in accordance with the conditions of an area. This study is expected to be able to illustrate the level of surface runoff in the Kali Genteng sub-catchment using the KINEROS model based on land use changes in 2012 and 2017 as well as with a 2-year and 5-year recurrent rain simulation. The results of the expenses analysis show that land use changes affect the infiltration and surface runoff and there is a relationship between land use and runoff. Maximum surface runoff occurs in 2017 which is 15,478 mm / minute