Monitoring Sedimentasi di Pintu DAM Rolag Telu Sebagai Bentuk Kesiapan Mencegah Banjir di Hilir Sungai Brantas

Abstract

Surabaya's located on the track of WS Brantas, particularly the downstream (Surabaya canal), wherein vulnerably to accident, such as inundation, sedimentation, and waste. In the matter of inundation management of Surabaya, one effort required to control the flood is sedimentation recording, related to the nature and characteristic of Surabaya canal. This process of sedimentation slowly shallow the riverbeds, hence reduce the wet-cross section or the width of the river, which furthermore can cause to an inundation if its debit of flow beyond its capacity. Concerning to explained-context above, it is considerably important to initiate a research about it. This study reviews sedimentation analyses and surveys held to Surabaya canal, to analyze the correlation between rainfall and discharge suspension and also its total number of suspension load. Those analyses made in order to have the estimation of sedimentation transportation exposed to annual average discharge, as a balance of waterflow volume of wetcross-section riverbeds (where the sediment laid). The result of this event will be used as a supporting data of disaster mitigation calculation of flood in the future. This research metodology commenced by the literature study, surveying and measuring, and sampling. Measurement result shows a correlation between discharge flow and suspension load of Surabaya canal, with a quite robust correlation coefficient, particularly at an discharge value is 0,248 m 3 /s descending value of concentrate sediment pops 20ppm, and spesific gravity value is following maximum at 2,767.

Pemanfaatan Kolam Tampung Sebagai Upaya Mitigasi Banjir Kawasan Pada Sub Sistem Medokan Ayu Kota Surabaya

“…Aliran permukaan yang besar ini menyebabkan kecepatan air menjadi destruktif sehingga terjadi longsoran dan sedimentasi [4]. Sedimentasi pada saluran akan mengurangi luasan penampang sehingga kapasitas saluran berkurang dan berpotensi menimbulkan genangan [5], seperti yang diilustrasikan pada Gambar 1.…”