Water allocation management in Karangmumus sub-basin using river flow hydrology approach
Tommy Ekamitra Sutarto (a*), Freddy Barus (a)

a) Civil Engineering Department, Politeknik Negeri Samarinda, Kampus Gunung Panjang, Jalan Dr. Cipto Mangunkusumo, Samarinda 75131
*tommysutarto[at]polnes.ac.id

Abstract

The Karangmumus sub-watershed is part of the Mahakam watershed. The total area of Karangmumus sub-watershed is 32,196.3 ha. In terms of the Karangmumus sub-watershed, water withdrawals are more dominant to meet household needs, irrigation, industry, and river maintenance. While the needs of livestock, fisheries, plantations and energy do not yet exist or the withdrawals are very small. Currently, the dependable discharge of the Karangmumus River from year to year tends to decrease due to the degradation of water catchment areas in the upper part of the Karangmumus sub-watershed. It is not uncommon in certain months for the Karangmumus River water to be so limited that the local PDAM is unable to meet the clean water demand of the population and have a medium class of potential drought hazard. An investigation has been made to solve this problem by dividing into dry, normal, and wet scenarios. A water management system is needed to manage the water balanced, on this investigation agreed water allocation management system by following the normal water condition scenario, the reliability (probability of fulfillment) of normal water allocation conditions is 50%.

Keywords: Dependable discharge, Scenarios, The Karangmumus sub-watershed, Water balance, Water management.

Topic: Hydrology