THE IMPACT OF LAND USE CHANGE TO THE HIDROLOGICAL CONDITION OF BALANGTIENG WATERSHED

Edy Junaedi; M. Siarudin; Yongky Indrajaya; Ary Widiyanto

doi:10.32679/jth.v7i1.554

THE IMPACT OF LAND USE CHANGE TO THE HIDROLOGICAL CONDITION OF BALANGTIENG WATERSHED

Edy Junaedi, M. Siarudin, Yongky Indrajaya, Ary Widiyanto

Abstract

Changes in land use may affect the hydrology of a watershed. This study aims to assess the hydrological conditions due to land use changes. The hydrological condition was predicted under four scenarios: (1) scenario 1, land use condition as in map 2009; (2) Scenario 2 is a change of 50% cocoa-coffee agroforestry to clove system in upstream area, and to monoculture rubber system in the middle and downstream area; (3) Scenario 3 is a change of 25% cocoa-coffee agroforestry to clove system in upstream area, and to monoculture rubber system in the middle and downstream area; (4) Scenario 4 is a change of 50% cocoa-coffee agroforestry to clove system in upstream area, and to monoculture rubber system in the middle and downstream area with a reduction of deforestation rate by 50%); and (5), Scenario 5 is a change of 25% cocoa-coffee agroforestry to clove system in upstream area, and to monoculture rubber system in the middle and downstream area with a reduction of deforestation rate by 50%. The prediction of water balance was measuredusing GenRiver model. Result shows that land use changes under scenario 1 and 2 do not affect the hydrological conditions, but need to watch out for the occurrence of flash floods. Reduction of deforestation rate in scenarios 3 and 4 can further improve the watershed hydrological conditions and maintain peak discharge during the rainy season

Keywords

Hidrology, watershed, land use change

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DOI: https://doi.org/10.32679/jth.v7i1.554