Modeling and flood control mapping (Case study : Surakarta city Indonesia)

Flood is a natural disaster that can occur in a region within a country. Some things can cause flooding, for example: high rainfall, blockage of drainage, improper environmental damage, insufficient water pump capacity in flood prone areas, and so on. Flood disaster will result in the loss of an area both material and immaterial losses. Therefore, several things can be done to minimize the incidence of flooding. Surakarta region is located in the lowlands at 105m above sea level and in the city center 95m above sea level, with an area of 44.1 square km (0.14 percent of Central Java area). The highest rainfall is 560mm, while the average rainfall during the rainy day is 22 mm on that day. Land elevation in downtown is lower than suburban Surakarta, therefore it is necessary to model water drainage to know water movement in Surakarta area. Of course this system must be accompanied by accurate information, appropriate early flood handling, and good water management engineering to minimize flooding. The method used to create water channel mapping model using MASIM method approach (Material Simulation). This research modeled and observed the process through simulation. The objectives of this research are: 1) to know the result of the flooded flood model based on the assessment of the main parameters covering rainfall, water flow discharge, and regional drainage capacity, 2) identifying the distribution of potential flood inundation, 3) evaluating the existing drainage management. The discovery of this study is a new model in controlling water flow.