Perencanaan Pengendalian Banjir Sungai Welang, Desa Sungiwetan Sampai Muara, Kabupaten Pasuruan

Widjanarko, Helmi (2013) Perencanaan Pengendalian Banjir Sungai Welang, Desa Sungiwetan Sampai Muara, Kabupaten Pasuruan. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sungai Welang salah satu sungai besar yang berada di Kabupaten Pasuruan yang pada saat curah hujan tinggi selalu menyebabkan banjir. Sungai Welang memiliki DAS seluas 511,60 km2 dan panjang sungai 40,09 km1, dengan hulu berupa pegunungan debit banjir yang dihasilkan cukup besar. Besarnya debit banjir mengakibatkan besarnya angkutan sedimen yang terbawa dari hulu. Diperlukannya suatu perencanaan pengendalian banjir pada Sungai Welang, dengan tujuan meminimalisir kerugian akibat banjir. Dari hasil perhitungan didapatkan besar debit banjir dengan metode HSS Gamma I Q50 = 513,27 m3/dt. Volume angkutan sedimen di Sungai Welang dari hulu sampai hilir antara 153,58m3- 19,95m3 dengan ketebalan sedimen antara 1,402m- 0,008m. Penampang eksisting Sungai Welang tidak menampung besarnya debit banjir rencana, oleh karena itu perlu dilakukan normalisasi. Untuk stabilitas lereng, beberapa penampang sungai, misal pada P51 lerengnya tidak mampu menahan besarnya debit banjir yang terjadi, oleh karena itu perlu dibangun pelindung berupa bronjong atau reventmen agar tidak longsor. ======================================================================================================= Welang River is one of the major rivers in Pasuruan which at the moment is always high rainfall causing flooding. The river has a catchment area Welang 511.60 km2 and a length of 40.09 KM1 river, with headwaters in the form of flood plains that discharge generated considerable. The magnitude of the flood discharge magnitude resulting transport of sediment washed from upstream. Need for a plan of flood control on the Welang River, with the goal of minimizing losses due to flooding. From the calculation results obtained with the method of flood discharge HSS Gamma I Q50 = 513.27 m3/sec. The volume of sediment transport in the Welang River from upstream to downstream between 153.58 m3 - 19.95 m3 with thickness of sediment between 1.402 m - 0, 008 m. Sectional existing Welang River can not accommodate large flood discharge plan, therefore it is necessary to normalize the river. For the stability of the slope, some cross the river, such as the P51 cross slope was not able to withstand the magnitude of the flood discharge, therefore it needs to be built in the form of protective gabion or reventmen avoid landslides.

Item Type: Thesis (Undergraduate)
Additional Information: RSS 627.4 Wid p
Uncontrolled Keywords: Banjir, Sungai Welang, Angkutan Sedimen
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering > TC530 Flood control
Divisions: Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 02 Mar 2021 08:03
Last Modified: 02 Mar 2021 08:03
URI: https://repository.its.ac.id/id/eprint/83188

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