Saputra, Tomi Destiyan (2018) TEKNIK PENGELOLAAN BANJIR BERDASARKAN TINGKAT RISIKO DI KECAMATAN PATUK, KABUPATEN GUNUNG KIDUL, D.I. YOGYAKARTA. Other thesis, Univesitas Pembangunan Nasional Veteran Yogyakarta.
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Abstract
Badan Nasional Penanggulangan Bencana (BNPB) Indonesia mendefinisikan
banjir sebagai peristiwa terendamnya suatu deaerah atau daratan karena volume air
yang meningkat. Pada tanggal 28 November 2017 telah terjadi banjir di beberapa
titik Kabupaten Gunung Kidul yang menyebabkan berbagai kerusakan beberapa
jembatan gantung, yaitu Jembatan Gantung Jelok, Desa Beji, Desa Pengkok
Kecamatan Patuk; Jembatan Gantung Kretek, Desa Ngleri, Kecamatan Patuk
mengalami rusak parah sehingga tidak bisa lagi digunakan pasca diterjang banjir
akibat aliran Sungai Oyo. Oleh karena itu, perlu diketahui tingkat risiko banjir dan
arahan pengelolaan serta rekayasa yang sesuai untuk menangani banjir tersebut.
Metode yang digunakan dalam penelitian ini ialah metode survei dan
pemetaan, wawancara, dan skoring. Metode pengambilan sampel yang digunakan
yaitu purposive sampling dengan acuan peta yang dibutuhkan untuk masing-masing
parameter. Karakteristik yang dikaji meliputi curah hujan, bentuklahan, kemiringan
lereng, jenis tanah, infiltrasi, tekstur tanah, satuan batuan, penggunaan lahan,
ketinggian banjir dan lama genangan. Analisis tingkat risiko meliputi indeks
ancaman, indeks kerentanan dan indeks kapasitas berdasarkan Peraturan Kepala
BNPB Nomor 02 Tahun 2012. Wawancara digunakan untuk mengetahui sejarah
kejadian banjir yang ada di lokasi penelitian.
Berdasarkan hasil penelitian Kecamatan Patuk terbagi menjadi 2 kelas yaitu
tingkat risiko sedang dan tingkat risiko rendah. Hasil penelitian menunjukan bahwa
daerah banjir di lokasi penelitian yaitu memiliki luas 743.637,77 m2 dengan volume
genangan banjir yaitu 885.555,93 m3 dan debit banjir total 61,046 m3/s. Teknik
pengelolaan yang diterapkan adalah tanggul, sistem surjan dan kolam retensi. Total
ada tanggul setinggi 1 m dan lebar 4 m, kolam retensi 8 kolam dan sistem surjan di
lokasi dengan penggunaan lahan sawah sehingga dengan kombinasi ini dapat
mengatasi bencana banjir secara signifikan.
Kata Kunci : Banjir, Risiko, Tanggul, Sistem Surjan, Kolam Retensi
Badan Nasional Penanggulangan Bencana (BNPB) Indonesia defines flooding
as an event of submergence of a region or land due to increased water volume. On
November 28, 2017 there were floods at several points in Gunung Kidul District that
caused various damage to several suspension bridges, such as Jelok Suspension
Bridge, Beji Village, Pengkok Village, Patuk Subdistrict; Kretek Suspension Bridge,
Ngleri Village, Patuk Subdistrict was badly damaged so that it could not be used
after being hit by floods due to Oyo River flow. Therefore, it is necessary to know the
level of flood risk, appropriate management, and engineering directives to deal with
the flood.
The methods used in this research include survey and mapping methods,
interview, and scoring. The sampling method used is purposive sampling with map
references needed for each parameter. The characteristics studied included rainfall,
landform, slope, soil type, infiltration, soil texture, rock unit, land use, flood height
and inundation duration. Risk level analysis includes the threat index, vulnerability
index and capacity index based on the Regulation of the Head of BNPB Number 02
of 2012. Interviews were used to determine the history of flood events at the study
site.
Based on research result, Patuk Subdistrict divided into 2 class, that the
moderate and low risk. The results showed that the flooded area in this research
area was 743.637,77 m2 with a flood inundation volume is 885.555,93 m3 and a total
flood discharge is 61,046 m3/s. The management techniques applied are dike, surjan
system, and retention pond. There will be dikes as high as 1 m and wide 4 m,
retention ponds of 8 ponds, and surjan system at that location with wet landuse so
that with this combination can significantly overcome floods.
Keywords : Flood, Risk, Dike, Surjan System, Retention Pond
| Item Type: | Thesis (Other) |
|---|---|
| Subjek: | T Technology > TD Environmental technology. Sanitary engineering |
| Divisions: | x. Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eny Suparny |
| Date Deposited: | 06 Feb 2019 02:13 |
| Last Modified: | 06 Feb 2019 02:13 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/18317 |
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