Analisis Nilai Koefisien Aliran Menggunakan Metode Bransby-Williams Di Kecamatan Cerme, Kabupaten Gresik.

Aurellia, Griselda Nabilah (2022) Analisis Nilai Koefisien Aliran Menggunakan Metode Bransby-Williams Di Kecamatan Cerme, Kabupaten Gresik. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada musim penghujan, Kecamatan Cerme menjadi salah satu yang terdampak banjir dari luapan Kali Lamong. Curah hujan yang tinggi dan tidak diimbangi dengan kapasitas Sungai Kali Lamong menjadi faktor utamanya. Maka diperlukan perencanaan atau perhitungan tampungan. Parameter penting dalam perhitungan yaitu nilai koefisien aliran, memiliki peran sebagai indikator aliran permukaan. Besarnya nilai koefisien aliran dipengaruhi oleh kemiringan lereng, tata guna lahan, intensitas hujan, simpanan permukaan dan infiltrasi tanah. Penelitian dilakukan pada Kecamatan Cerme, bertujuan untuk mengetahui nilai koefisien aliran sebagai dasar perhitungan aliran permukaan. Penentuan nilai menggunakan metode Bransby-Williams menggunakan data citra dan data uji lapangan. Data citra digunakan untuk perhitungan parameter kemiringan lereng, tata guna lahan, intensitas hujan dan simpanan permukaan. Sedangkan data lapangan, dilakukan uji infiltrasi menggunakan double ring infiltrometer untuk mendapatkan nilai laju infiltrasi dan uji ayakan untuk mendapatkan tekstur tanah. Seluruh data dari tiap parameter dilakukan intersect sehingga mendapatkan nilai koefisien aliran. Didapatkan hasil nilai koefisien aliran di daerah penelitian sebesar 50% seluas 0.18 km2 termasuk kategori normal, 51-75% seluas 1.5 km2 termasuk kategori tinggi dan 76-100% seluas 9.2 km2 termasuk kategori ekstrem. Untuk rata-rata keseluruhan nilai koefisien aliran sebesar 65.7% termasuk ke dalam nilai yang tinggi. Air yang terlimpas ke permukaan sebesar 65.7% sedangkan yang berhasil terserap atau tersimpan ke dalam tanah sebesar 34.3%. Dibutuhkan penanganan lebih lanjut untuk dapat mengatasi aliran air yang terlimpas di daerah tersebut.
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During the rainy season, Cerme District is one of the areas affected by flooding from the overflow of Lamong River. High rainfall and not being matched by the capacity of the Kali Lamong River are the main factors. So it is necessary to plan or storage calculation. An important parameter in the calculation, namely the value of the flow coefficient, has a role as an indicator of surface runoff. The value of the flow coefficient is influenced by the slope, land use, rainfall intensity, surface storage and soil infiltration. The research was conducted in Cerme District, aiming to determine the value of the flow coefficient as the basis for calculating surface runoff. Determination of value using the Bransby-Williams method using image data and field test data. Image data is used to calculate slope parameters, land use, rainfall intensity and surface storage. While the field data, an infiltration test was carried out using a double ring infiltrometer to get the value of the infiltration rate and a sieve test to get the soil texture. All data from each parameter are intersected to obtain the flow coefficient value. The results of the flow coefficient in the study area are 50% covering an area of 0.18 km2 including the normal category, 51-75% of 1.5 km2 including the high category and 76-100% covering an area of 9.2 km2 including the extreme category. For the overall average value of the flow coefficient of 65.7% is included in the high value. Water that runs off to the surface is 65.7% while that which is successfully absorbed or stored in the ground is 34.3%. Further treatment is needed to overcome the runoff water flow in the area.

Item Type:	Thesis (Other)
Additional Information:	RSGf 551.48 Aur a-1 2022
Uncontrolled Keywords:	Laju Infiltrasi, Koefisien Aliran, Metode Bransby-Williams, Tekstur Tanah. Bransby-William Method, Flow Coefficient, Infiltration Rate, Soil Texture.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	21 May 2026 06:47
Last Modified:	21 May 2026 06:47
URI:	http://repository.its.ac.id/id/eprint/133313

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