Analisis Kapasitas Penampang Banjir Kanal Barat Kota Semarang Untuk Perencanaan Pengendalian Banjir

Overflow in the West Floodway is a natural event caused by inadequate river capacity to flow the existing discharge.Based on the analysis of hydrological West Floodway with the help of software HEC-HMS (Hydrologic Engineering Center-Hydrologic Modeling System) obtained discharge plan (Q50) of 951.9 m3/s. The hydraulics analysis was carried out by the help of software HEC-RAS (Hydrologic Engineering Center-River Analysis System)and the result is an overflow along the 8 km (WF 0-WF 97) in the West Floodway Region. To overcome these problems, it is necessary to be taken a solution, that is increasing river capacity. Based on existing field conditions (limited space) then the plan is using 2 type of river profiles, there are at the downstream river is used for single and double crosssection on the upstream, both is planning using manning formula