Analysis of Runoff Discharge on Kaliurang Road Drainage Channels KM 6.5 – 7 Using SWMM 5.2 Model

Overflow in the highway drainage channel is a malfunction of the drainage function on Kaliurang road KM 6.5 - 7. A good drainage system is very necessary, so it is necessary to evaluate the drainage function on Kaliurang road KM 6.5 – 7 using the SWMM 5.2 model so that it can function optimally. The goal of the study was figure out the runoff discharge so that the drainage capacity could be evaluated and the highway could work as well as possible. SWMM model analysis to determine runoff discharge in each of the sub catchment area (DTA). The total runoff is an accumulation of draft rains with 2, 5 and 10-year re-periods. The largest runoff discharge in J7 is 0.728 m3/s at 2-year re-period, 0.729 m3/s at 5-year re-period, 0.73 m3/s at 10-year re-period. The simulation results obtained the largest runoff discharge in J7 because it is an accumulation of J6 and the catch from DTA 7 is the most extensive, which is 2.1 ha. SWMM 5.2 simulation results for link capacity analysis for existing channels, can be seen on channels SAL 6 and SAL 9 cannot receive runoff discharge from rain in 2, 5 and 10-years re-period. SAL 4 almost overflowed to receive rainwater runoff in a 10-year re-period. It is necessary to redesign the drainage channel to obtain the ideal channel size for SAL 4, SAL 6 and SAL 9.