Land-use change is the main cause of high runoff in the Kuranji watershed and has social and economic impacts on the public. This study aims to determine the dynamics of watershed water yields and to formulate directions and recommendations for the management of the Kuranji watershed. The dynamics of the water yield in Kuranji watershed were analysed based on the SWAT hydrological model from the conservation area scenarios. The results showed the value of the dynamics water yield in Kuranji watershed is: reliability 0,79 with a duration of 290 days a year, resilience value 0,67 or 67% certainty of success of the watershed to return to normal conditions with a recovery period of 75 days a year and the average vulnerability is 389.466 m3/day. So that the form of a decision to be made with these conditions is that this area can be developed but the types of plants grown must be sensitive to water shortages. The direction and recommendations of the Kuranji watershed management on the future are to grow public awareness through the formation of public perceptions, conservation on target, continuous watershed conservation, public empowerment, and incentive policies governing payment for environmental services.
Perubahan iklim dan penggunaan lahan memiliki dampak yang besar terhadap keseimbangan air. Perubahan penggunaan lahan merupakan penyebab utama tingginya run off dibandingkan dengan faktor lainnya. Bencana alam yang terjadi di wilayah DAS (Daerah Aliran Sungai) merupakan indikasi bahwa fungsi hidrologi di wilayah DAS dalam keadaan terganggu dan tidak dapat mendukung sistem tata air yang optimal. Hampir setiap tahun terjadi banjir di kawasan DAS Kuranji yang menimbulkan kerugian secara materil dan korban jiwa. Salah satu bentuk upaya untuk menjaga kelestarian DAS adalah dengan melakukan konservasi pada wilayah – wilayah yang memberikan dampak buruk terhadap DAS seperti lahan kritis. Tujuan penelitian ini adalah mensimulasikan konservasi lahan kritis DAS Kuranji terhadap perubahan hasil air. Simulasi dilakukan terhadap 3 skenario penggunaan lahan yaitu konservasi 50 %, 80 % dan 100 % terhadap luas lahan kritis. Hasil penelitian menunjukkan bahwa terdapat 818,92 ha lahan kritis yang bisa digunakan untuk lahan konservasi. Simulasi perubahan penggunaan lahan terhadap lahan kritis dari beberapa skenario menunjukkan bahwa skenario konservasi 100 % menunjukkan kondisi hidrologi yang lebih baik. Artinya, semakin luas lahan yang di konservasi menjadi hutan campuran maka akan menurunkan hasil air, sehingga menurunkan aliran permukaan dan menaikkan volume air tanah DAS
The Kuranji watershed has a complex problem which cannot be studied with a single scientific approach. In addition to an ecological approach it is also necessary to consider social and economic influences. Conserving areas that have a negative impact on watersheds, such as critical lands, is one of the efforts made to conserve watersheds will reducing costs and speeding up the recovery. The aim of this research is to estimate the economic value of the water yield of the Kuranji watershed on land conservation efforts. To get the economic value of water yield in the watershed, the non-market price approach method is used with the Contingent Valuation Method (CVM). The results showed that there were 356.10 ha of critical land in the Kuranji watershed that could be conserved. The value of water yield in existing land use conditions is greater than water yield in land use conditions influenced by conservation efforts. In this study, it was determined that the estimated economic value of water yield in the Kuranji watershed is 272 IDR/m3 of water. This is supported with a conservation value of 80% of critical land.
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