Pemisahan Aliran Dasar Menggunakan Master Kurva Resesi di DAS Brantas

Mohamad Wawan Sujarwo; Davit  Setiawan; Indarto Indarto; Sri  Wahyuningsih

Authors

Mohamad Wawan Sujarwo Universitas Jember
Davit Setiawan Universitas Jember
Indarto Indarto Universitas Jember
Sri Wahyuningsih Universitas Jember

Keywords:

MRC, flow component, separation, baseflow, sub-surfaceflow

Abstract

Baseflow is the main component of water supply during the dry seasons. Baseflow contributes to water supply during the recession period and periods of no rain or little rain. This research aims to determine the coefficient during the recession periods of the hydrograph and separate the flow component to three-part i.e., quick, sub-surface and baseflow. Two sub-watersheds outlets at Ploso and Kertosono in the Brantas Watershed areas were chosen for this study. Research procedure concist of data preparation and treatment using microsoft excel, the recession coefficient analysis based on the Master Recession Curve (MRC), evaluation model performance using statistical test and visualisation separation performance using hydrograph. Calibration of MRC produce linear reservoir recession equation of Q = Q0. e–kt. The value of k is the recession coefficient for each flow component. The value of k for Ploso sub-watershed are (k1) =0,04 for baseflow, (k2) = 0,15 sub-surfaceflow and (k3) = 0,428 for quickflow. Rescpectively, for the Kertosono sub-watershed, (k1) =0,06 for baseflow, (k2) = 0,21 sub-surfaceflow and (k3) = 0,47 for quickflow. Stastitical analysis of model performance show the value of r2 = 0,988 and RMSE = 0,69 for Ploso and r2 = 0,976 and RMSE = 0,74 for Kertosono.

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