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Evaluasi Ketersediaan Air Baku pada Bendung Gunungcupu Jihan Yulianti; Sulwan Permana; Mochammad Suva Nugraha
Jurnal Konstruksi Vol 21 No 2 (2023): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.21-2.1403

Abstract

The availability of water at Gunungcupu Dam is very much needed to support various community activities in the service area. One of the causes of the reduced supply of clean water is damage to pipes due to natural disasters, such as what happened in 2022, there was a flash flood that overflowed the Citanduy River located in the Gunungcupu Bend area and caused the main raw water transmission pipe belonging to PDAM Tirta Galuh Ciamis to reach the Gunungcupu Intake. cut off for 100 meters, as a result the water supply in the Gunugcupu Dam service area was disrupted. So this research was carried out to determine the availability of raw water, find out the projected need for clean water in 2042, and find out the planned flood discharge at Gunungcupu Dam. The method used is a quantitative approach. To determine the availability of raw water, you need to process actual discharge data using the Weibull equation, calculate population projections using arithmetic and geometric methods, calculate clean water requirements for domestic needs in 2042, and process rainfall data to analyze the planned maximum discharge using the Unit Hydrograph method. Nakayasu Synthetic and Gama I Synthetic Unit Hydrograph. The calculation results show that water availability at the Gunungcupu Dam is 730 liters/second. The need for clean water in 2042 for the three sub-districts is 302.66 liters/second. Based on these results, the water supply from Gunungcupu Dam can meet the clean water needs for Ciamis, Baregbeg, and Cijeungjing Districts in 2042. Then the flood discharge planned by the Nakayasu HSS method for Gumbel probability at Q100 is 930,484 m3/second and for Log Normal probability at Q100 amounting to 786,302 m3/second, while the planned flood discharge for the HSS Gama I method for Gumbel probability in Q100 is 833,381 m3/second and for Log Normal probability in Q100 is 707,002 m3/second. Based on these results, it can be concluded that the largest maximum discharge is the HSS Nakayasu method for Gumbel probability, so the HSS Nakayasu method is good for planning the safety of water structures against flooding.
Perencanaan Distribusi Air Sumur Bor Desa Cibunar Kecamatan Cibatu Ahmad Rosidin; Sulwan Permana
Jurnal Konstruksi Vol 22 No 1 (2024): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.22-1.1404

Abstract

Air bersih sangat berperan penting dalam kehidupan sehari-hari. Namun pada musim kemarau mengakibatkan krisis air di beberapa wilayah Kabupaten Garut, dampak dari krisis air yang dilanda salah satunya adalah Desa Cibunar Kecamatan Cibatu. Tujuan dari penelitian ini yaitu merencanakan debit kebutuhan air minum, kapasitas bak penampung dan perencanaan distribusi air dengan memaksimalkan potensi air sumur bor sebagai sumber air baku. Perlu adanya rekayasa distribusi dengan jaringan pipa berbahan PVC dan sistem pengaliran kombinasi. Dalam perencanaan jaringan ini proyeksi penduduk menggunakan metode geometrik dengan tahun rencana 2023-2042 dengan jumlah penduduk di akhir tahun rencana sebesar 11191 jiwa, jumlah kebutuhan air perjiwa sebesar 60 liter/orang/hari. Jumlah total kebutuhan air domestik untuk satu desa sebesar 671460 liter/orang/hari atau 7,77 liter/detik pada akhir tahun proyeksi rencana 2042. Data-data yang telah lengkap kemudian dianalisis dengan aplikasi EPANET 2.2, hasil dari analisis didapat tekanan rata-rata 25,23 m, headloss rata-rata 0,56 km/m dan kecepatan aliran rata-rata 0,18 m/s dan dari hasil analisis tersebut didapat diameter ideal pipa dsitribusi dengan diameter 100-200 mm. Sedangkakan hasil running dengan skenario jam puncak didapat debit sebesar 879 liter/jam. Dalam perencanaan spesifikasi pompa yang dibutuhkan total head sebesar 159,34 m dan daya sebesar 45,41 Kw dengan tipe pompa CR 120-5-1. Perencanaan jaringan distribuisi Desa Cibunar pada akhir tahun rencana dapat memenuhi kebutuhan masyarakat selama periode perencanaan.
Co-Authors Ahmad Rosidin Ai Rustini Amelia Citra Mulya Komalasari Anjas Ninda Hantari Bambang Haidar Dwiyanto Desty Rahmawati Kusumah Fim Fahrul Fauzi Imam Muhammad Nawawi Jihan Yulianti Mochammad Suva Nugraha Mohamad Fadilah