Analysis of drainage capacity to resolve inundation problem on Jend. H. Amir Machmud street Cimahi City West Java province

Abstract

Nowadays, water inundation often occurs in some areas in Cimahi. One of the highest inundation occurred on Jenderal H. Amir Machmud street with a depth of 100 cm with the receding time 1 - 2 hours. This condition causes a very high level of congestion, so it can cut access from Bandung to Cimahi. In addition, of course, this condition can cause damage to the road itself. Using a drainage cross-section data from Cimahi government and field measurement, rainfall data, topographic map, and land use data the existing drainage capacity can be calculated by manual and HEC-RAS. Based on the result of manual calculation, there is total debit in drainage channel on 2 year return period is 2.86 m3/sec, 5 year return period is 3.59 m3/sec, and a 10 year return period is 4.08 m3/sec with the existing channel debit is 2.02 m3/sec so that cause the water overflows from the channel. The Cilember River flows with a large discharge 2 years period is 59.64 m3/sec, a 5 year return period is 93.74 m3/sec, and 10 years 118.30 m3/sec crossing Amir Machmud Street affecting high inundation at the site of the review. To solve the problem, some models of solution have been made in the form of new box culvert drainage channel planning with the smallest dimension is 2 × 2 m and biggest dimension is 3 × 3 m. Meanwhile, to handle the overflow of water from Cilember River planned 2 pieces of culverts with dimensions 2.5 × 2.5 m.