., Qariatullailiyah (2015) Analisa pengaruh tampungan terhadap pengendalian banjir dan penyediaan air baku pada Daerah Aliran Sungai (DAS) Kemuning - Sampang. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Sungai Kemuning yang berada di Kabupaten Sampang mengalami banjir
hampir setiap tahun di musim penghujan. Kondisi ini berbanding terbalik saat musim
kemarau, dimana DAS Kemuning mengalami kekeringan, sehingga kebutuhan air
baku masyarakat tidak terpenuhi. Kelebihan air pada musim penghujan seharusnya
dapat dimanfaatkan untuk memenuhi kebutuhan air baku masyarakat. Tujuan dari
studi ini yaitu untuk mengetahui bencana banjir dan kekeringan serta dampaknya
yang terjadi pada DAS Sungai Kemuning, serta mengetahui potensi tampungan
dalam penyediaan air baku dan pengendalian banjir Sungai Kemuning.
Dalam menganalisa hidrologi dan hidrolika dilakukan dengan program bantu
HEC-HMS dan HEC-RAS. Berdasarkan analisa perhitungan, diperoleh debit banjir
sebesar 360,4 m3/detik, sedangkan kapasitas sungai hanya mampu mengalirkan 35
m3/detik. Hal ini menunjukkan kapasitas sungai tidak mampu mengalirkan debit
banjir yang terjadi. Oleh karena itu, studi ini menganalisa suatu skenario berupa
tampungan yang dapat menahan kelebihan debit pada saat musim hujan sekaligus
menyediakan air baku terutama saat musim kemarau. Skenario didasarkan atas lokasi
tampungan, dengan mengkombinasikan letak tampungan pada tiga cabang sungai
utama pada sungai Kemuning.
Terdapat tiga skenario dalam studi ini, skenario pertama dilakukan dengan
meletakkan satu tampungan pada sungai utama dan di masing-masing tiga cabang
sungai utama. Sedangkan untuk skenario kedua dan ketiga dilakukan dengan
menambahkan beberapa tampungan dari skenario sebelumnya. Berdasarkan hasil
simulasi ketiga skenario tersebut, maka diperoleh pengurangan debit banjir rencana
dan ketersediaan air terbesar pada skenario ketiga. Hasil dari skenario ketiga
diperoleh debit banjir maksimum berkurang menjadi 241,9 m3/detik. Sedangkan
apabila tampungan-tampungan pada skenario ketiga dijumlahkan, maka akan
didapatkan hasil tebesar jika dibandingkan skenario lain, yaitu sebesar36.952.989,8
m3. Hasil dari simulasi skenario 1, 2, dan 3 menunjukkan bahwa pemberian
tampungan pada DAS Kemuning mampu menahan debit banjir dan menyediakan air
baku, namun belum secara menyeluruh. ========== Kemuning river which located in Sampang were flooded almost every year in
the rainy season. This condition is inversely when the dry season, the Kemuning
watershed suffered drought, so that the raw water needs of society are not fulfilled.
The excess water in the rainy season should be used to fulfill the needs of society raw
water. The purpose of this study is to determine the flood and drought and the impact
that occurs in Kemuning watershed, as well as know the potential of reservoirs in the
raw water supply and flood control Kemuning River.
To analyze the hydrology and hydraulics conducted with assistive program
HEC-HMS and HEC-RAS. Based on the analysis calculations, the flood discharge
amounting 360.4 m3 / sec, whereas the capacity of the river is only able to drain 35
m3 / sec. This is showing that the capacity of the river is not able to drain the flood
discharge occurred. Therefore, this study analyzed a scenario such as reservoirs that
can restrain the excess flow in the rainy season as well as providing the raw water,
especially during the dry season. The scenario is based on the location of reservoirs,
with combine the location of reservoirs in the three major rivers branches in
Kemuning river.
There are three scenarios in this study, the first scenario is done by putting a
reservoirs in the major rivers and in each of the three major branches of the river.
While for the second and third scenarios is done by adding some reservoirs from the
previous scenarios. Based on the three scenarios simulation results, then we obtain
the largest reduction of flood discharge and water availability is in the third
scenario. The results from the third scenarios is obtained maximum flood discharge
was reduced to 241.9 m3 / sec. Whereas if the reservoirs on the third scenario added
together, it will get the biggest results when it compared with other scenarios, the
amount is 36.952.989,8 m3. The results from the simulation scenarios 1, 2, and 3 is
indicated that the giving of reservoirs in the Kemuning watershed is able to resist
flood discharge and supply of raw water, but has not been overall.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTS 627.4 Qar a |
| Uncontrolled Keywords: | Banjir, Kekeringan, Tampungan, DAS Kemuning, Flood, Drought, Raw Water, Reservoir, Kemuning River |
| Subjects: | G Geography. Anthropology. Recreation > GB Physical geography > GB1399.9 Floods |
| Divisions: | Faculty of Civil Engineering and Planning > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | - Davi Wah |
| Date Deposited: | 24 Apr 2019 03:19 |
| Last Modified: | 24 Apr 2019 03:19 |
| URI: | http://repository.its.ac.id/id/eprint/62825 |
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