PERENCANAAN BENDUNG TETAP BATANG LUMPO II KABUPATEN PESISIR SELATAN

NUGRAHA, OJI PRATAMA and BAHRUL, ANIF and ZUHERNA, MIZWAR (2020) PERENCANAAN BENDUNG TETAP BATANG LUMPO II KABUPATEN PESISIR SELATAN. Diploma thesis, Universitas Bung Hatta.

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Abstract

PERENCANAAN BENDUNG TETAP BATANG LUMPO II KABUPATEN PESISIR SELATAN Nugrah Oji Pratama, Bahrul Anif, Zuherna Mizwar Program Studi Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Bung Hatta Padang E-mail : nugrahojipratama96@gmail.com, bahrulanif@bunghatta.ac.id, zuemizwar@gmail.com. Abstrak Bendung adalah suatu bangunan yang diletakkan melintang pada suatu aliran sungai dengan maksud untuk menaikkan muka air aliran, agar bisa di alirkan ketempat-tempat yang letaknya lebih tinggi dari dasar aliran sungai tersebut. Daerah irigasi Batang Lumpo II seluas 375 Ha, berdasarkan administrasi terletak di daerah Lumpo Utara Kecamatan IV Jurai Kabupaten Pesisir Selatan. Bendung ini direncanakan dengan mercu tipe bulat dengan kolam olak peredam energy USBR tipe IV. Perhitungan analisa hidrologi untuk curah hujan rencana yang digunakan yaitu distribusi Normal, Gumbel, Log Normal, Log Person Tipe III, dan debit rencana menggunakan metode Hasper, Weduwen, Mononobe, dan Rasional. Dari hasil perhitungan didapat : debit rencana 50 tahun (Q50) = 253,075 m3/dt, lebar efektif bendung 33,69 m, tinggi mercu 2,8 m. Perhitungan stabilitas bendung dalam keadaan air normal didapat angka keamanan terhadap guling = 1,99 > 1,5 dan terhadap geser = 1,61 > 1,5. Pada saat kondisi banjir didapat angka keamanan terhadap guling = 1,91 > 1,5 dan terhadap geser = 1,94 > 1,5. Untuk daya dukung tanah pada kondisi air normal dan air banjir yang didapat kontruksi bendung aman dan kontrol, karena tegangan tanah yang terjadi akibat gaya yang bekerja pada dinding tidak melebihi dari tegangan yang diizinkan, yaitu 31,363 ton/m2. Kata kunci : Bendung, Tipe Mercu, Analisa Hidrologi, Stabilitas. PERMANENT WEIR PLANNING BATANG LUMPO II DISTRICT PESISIR SELATAN Nugrah Oji Pratama, Bahrul Anif, Zuherna Mizwar Civil Engineering Study Program, Faculty of Civil Engineering and Planning, Bung Hatta University Of Padang E-mail : nugrahojipratama96@gmail.com, bahrulanif@bunghatta.ac.id, zuemizwar@gmail.com. Abstract A weir is a building that is placed transversely on a river flow with the intention to raise the water level, so that it can be flowed to places that are located higher than the bottom of the river flow. The irrigation area of Batang Lumpo II is 375 Ha, based on administration located in the area Lumpo Utara District IV Jurai, Pesisir Selatan Regency. This weir is planned with a round type lighthouse with a pool of USBR type IV energy damper. Hydrological analysis calculations for rainfall plans used are the Normal distribution, Gumbel, Normal Log, Type Person Log III, and discharge plans using the Hasper, Weduwen, Mononobe, and Rational methods. The calculation results obtained : 50 year plan discharge (Q50) = 253,075 m3 / s, the effective width of the weir is 33.69 m, the height of the lighthouse is 2.8 m. Calculation of weir stability under normal water conditions obtained safety figures for bolsters = 1.99 > 1.5 and for shear = 1.61 > 1.5. At the time of flood conditions obtained safety figures for bolsters = 1.91 > 1.5 and for shear = 1.94 > 1.5. For the carrying capacity of the soil under normal water conditions and flood water obtained by the construction of safe weir and control, because the soil stress that occurs due to the force acting on the wall does not exceed the allowable stress, which is 31,363 tons / m2. Keywords : Weir, Mercu Type, Hydrological Analysis, Stability.

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