Methods for Handling Rob Floods in the Banger River Basin in Semarang City

Abstract

In the area of North Semarang often occurs tidal floods. The current government has dealt with the flooding of Rob by making dykes on the north coast of semarang. There is a method of handling tidal flooding by making a retention pool, Longstorage equipped with a pump if there is a flood the water is stored in a retention pond then the water is pumped into the river. The purpose of this study is to formulate a correlation between pumps and retention ponds. Alternative flood control using the count of 50 years. The method used is using HEC-HMS. There are three alternatives used in the simulation: 1st alternative pond with an area of 3.8 m3 and a storage volume of 114,000 m3, with inflow of 31.4 m3/s in this alternative the capacity of pump is 30 m3/s, second alternative pool with an area of 4.7 m2 and reservoir volume of 142,000 m3, with inflow of 31.4 m3/s, with pump capacity of 27 m3/s. third alternative ponds with an area of 5.0 m2 and a reservoir volume of 150,000 m3, with inflow of 31.4 m3/s. In this alternative a pump with a capacity of 25 m3/s used.