Manajemen Limpasan Air Hujan Menuju Zero Runoff Kawasan Kampus Universitas Gadjah Mada
Muhammad Adi Setiawan, Dr. Ir. Budi Kamulyan, M.Eng., IPM.
2023 | Skripsi | TEKNIK SIPIL
Pembangunan gedung-gedung baru di Universitas
Gadjah Mada berpotensi mengurangi luasan ruang terbuka hijau sehingga saat
musim hujan kemampuan tanah meresapkan air hujan berkurang dan saluran drainase
menerima peningkatan limpasan air hujan. Diperlukan perencanaan infrastruktur berupa
sistem drainase berwawasan lingkungan sebagai upaya konservasi air dengan cara
memperlambat aliran limpasan air hujan dan meresapkan sebanyak-banyaknya air ke
dalam tanah secara alami.
Berdasarkan permasalahan diatas maka akan
dilakukan analisis tata guna lahan untuk mengetahui persentase area bangunan,
jalan, serta ruang terbuka hijau dan analisis data hujan untuk menentukan debit
air hujan rancangan di kawasan kampus UGM. Setelah itu akan dilakukan evaluasi penanganan
banjir berdasarkan jumlah sumur resapan terpasang pada kondisi eksisting dan hasilnya
akan digunakan sebagai dasar pertimbangan memberikan alternatif penanganan
manajemen air limpasan hujan.
Hasil dari penelitian menunjukkan
komposisi tata guna lahan di UGM terdiri dari lahan hijau sebesar 58%, bangunan
sebesar 22%, dan jalan sebesar 20?n diperoleh debit air hujan rancangan kawasan
sebesar 11,389 m3/s. Persentase penanganan di 21 pembagian klaster
kondisi eksisting berkisar antara 0 sampai dengan 1,463%. Dengan menambahkan
sumur-sumur resapan baru di tiga kawasan yang berpotensi mengalami genangan
tertinggi, mampu mengurangi potensi banjir secara layak dan efektif dengan
pertambahan tampungan air sebesar 5,316% di sekeliling GSP, 1,764% di bundaran
UGM, dan 0,567% di Jalan Notonagoro.
The construction of new buildings at
Gadjah Mada University has the potential to reduce the area of green open space
so that during the rainy season the ability of the soil to absorb rainwater
decreases and the drainage channels receive an increase in rainwater runoff.
Infrastructure planning is needed in the form of an environmentally sound
drainage system as an effort to conserve water by slowing down the flow of
rainwater runoff and absorbing as much water as possible into the ground
naturally.
Based on the problems above, a land use
analysis will be carried out to find out the percentage of building areas,
roads, and green open spaces and analysis of rain data to determine the design
rainwater discharge in the UGM campus area. After that an evaluation of flood
management will be carried out based on the number of infiltration wells
installed in the existing conditions and the results will be used as a basis
for consideration in providing alternative management of rain runoff water.
The results of the study show that the
composition of land use at UGM consists of green land by 58%, buildings by 22%,
and roads by 20% and obtained an area design rainwater discharge of 11,389 m3/s.
The percentage of handling in the 21 existing condition cluster divisions
ranged from 0 to 1.463%. By adding new infiltration wells in the three areas
that have the highest potential for inundation, able to reduce the potential
for flooding properly and effectively with an increase in water storage by
5.316% around the GSP, 1.764% at the UGM roundabout, and 0.567% at Notonagoro
Street.
Kata Kunci : drainase berwawasan lingkungan, tata guna lahan, debit, penanganan, sumur resapan
