Impact of Land Use Change to Dependable Flow in Kuncir River, Nganjuk District, East Java

Liyantono ., Fajardo ., Tasuku Kato

Abstract


Abstract
Currently, Kuncir River is a source of irrigation water in the southern of Nganjuk District. The potential of
Kuncir River was assessed by measuring the dependable flow as an indicator of water supply for irrigated
areas. The objective of this study was to estimate the river discharge and its dependable flow for irrigation
from Kuncir River in Nganjuk District. River discharge data was collected from Kuncir River, rainfall data was
collected from Nganjuk District, East Java and climate data was collected from climatology station of Badan
Meteorologi Klimatologi dan Geofisika (BMKG) Sawahan, Nganjuk. There were two major steps on this
study which were model development and model simulation using SWAT after calibration and validation.
Model simulation showed NS value of 0.67 with mean daily flow of 7.15 m3 s-1. Based on land use change
scenario, the conversion of 50% on forest and 50% on range-grasses into agriculture land could increase
3.1% and 2.5% of average river discharge, respectively.

Abstrak
Sungai Kuncir merupakan sumber air irigasi di bagian selatan Kabupaten Nganjuk. Potensi Sungai
Kuncir dapat dikaji melalui perhitungan debit andalan untuk dijadikan indikator jumlah pemenuhan air di
daerah irigasi. Penelitian ini bertujuan menduga debit air sungai dan menghitung besar debit andalan
untuk irigasi pada Sungai Kuncir, Kabupaten Nganjuk. Data debit sungai dikumpulkan langsung di Sungai
Kuncir, data hujan dikumpulkan dari Dinas PU dan Pengairan Kabupaten Nganjuk, Jawa Timur, dan data
iklim dikumpulkan dari stasiun kimatologi Badan Meteorologi Klimatologi dan Geofisika (BMKG) Sawahan,
Nganjuk. Penelitian dilakukan melalui dua tahap, yaitu proses pembangunan model dan proses simulasi
dengan SWAT setelah melalui proses kalibrasi dan validasi. Simulasi model memiliki nilai NS sebesar 0.67
dan debit rata-rata harian sebesar 7.15 m3 s-1. Skenario perubahan lahan menggambarkan konversi 50%
lahan hutan dan 50% semak belukar menjadi lahan pertanian berpotensi meningkatkan nilai debit rata-rata
Sungai Kuncir masing-masing sebesar 3.1% dan 2.5%.


Keywords


Kuncir River, dependable flow, SWAT

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