PERBAIKAN PADA ALUR SUNGAI GUNTING KABUPATEN JOMBANG DENGAN NORMALISASI DAN TURAP SEBAGAI PENGENDALI BANJIR

Abstract

Flooding is a problem that often occurs on the banks of the Gunting River, Sumiboto District, Jombang Regency. Reduced river capacity due to the accumulation of sedimentation and narrowing of river bodies that occurs due to natural factors or human activity. Several technical and non-technical ways to anticipate and control flooding. Technically, it can be carried out normalizing rivers and embankments, constructing floodways, constructing retarding basins, constructing sudetan, and controlling floods with reservoirs. Whereas non-technically, it can be through flood plain management, land use management in flood watersheds, socialization, or counseling to the community about flooding problems, and utilization of existing river banks. Based on the calculation, there is a design rainfall of 124,007 mm. Buntung River flood debit with a 50-years return period of 342,935 m3/second. Based on the analysis with a 50-years return period, the existing section can’t accommodate the planned flood discharge, so it is planned to improve the river. The cross-sectional dimensions of the river use a trapezoidal shape. The result of the embankment planning is obtained at least 0.75 m of embankment guard from the water level. Based on the calculation of the Budget Plan it gets around Rp. 226.170.610.600.-