Evaluasi Kinerja Sistem Drainase untuk Mengatasi Masalah Banjir pada Kawasan Jalan Ismailiyah Kecamatan Medan Kota

Abstract

In this research, what will be evaluated is the condition of the drainage system located in the Ismailiyah Street Area, Medan Kota District. Drainage is a series of water buildings that function to reduce and / or remove excess water from an area or land, so that the land can be functioned properly. optimal The appointment of this problem is due to the puddle of rainwater that occurs in the road area, especially during heavy rain. As a result of this problem, an evaluation of the capacity of the drainage channel is carried out to determine whether the capacity of the drainage channel is adequate or not in accommodating flood discharge. Data collection in this study is in the form of primary data in the form of existing data on drainage systems and flow condition data and secondary data in the form of BMKG maximum daily rainfall data from 3 rainfall stations and general maps of the study area. Determination of the observation point of the rain station using the thiesen polygon method, so that the observation point of the BMKG Sampali station was obtained. In this study , the Log Pearson Type III method was used and obtained the value of rainfall intensity with the mononobe formula for the 5-year anniversary period of 127.687 mm / hour.From the results of the evaluation of flood discharge, the 5-year anniversary period plan with a rational method was obtained for Qr 1 = 1,697 m 3 / sec and Qr2 = 1,496 m3 / sec. With the calculation of the existing channel capacity, Qs1 = 0.784 m 3 / sec and Qs2 = 0.518 m3 / sec. Based on the results of the comparison of the existing capacity of the channel and the planned discharge, it is known that the existing channel cannot accommodate the planned flood discharge, causing overflow of water out of the channel and inundating the surrounding area. To overcome this, re-planning of drainage channels is carried out.