EVALUASI DAN PERBAIKAN SISTEM DRAINASE SERTA PENGENDALIAN BANJIR PERKOTAAN ( Studi Kasus Limbangan Wetan, Limbangan Kulon, Kelurahan Brebes, Pasar Batang, Gandasuli)

Abstract

Flooding is a state of natural disaster phenomena which are related to the amount of damage in term of life and material. Flooding began increasing population, climate change and land use change. Small drainage capacity and the amount of sediment in the drainage causing inundation / flooding. Other issues also arise from domestic wastewater. Dense urban areas can’t process individual waste water. So that, the waste water will flow into the urban drainage system. In this study, rainfall plays an important role in the evaluation and planning of urban drainage. The data needed rainfall data, data on land use and topographic data. Rainfall data used is the maximum daily rainfall data station with other stations comparisons. Rainfall data were analyzed with Log Person III and Gumbel then tested with Chi Square for selecting statistical distributions received. Rainfall data is then applied to the hourly rainfall intensity mononobe method. The intensity of rain is useful to calculate the peak discharge by rational methods.