Optimasi Pengelolaan Sumber Daya Air Pada Sub-DAS Keyang, Slahung, dan Sungkur Kabupaten Ponorogo dengan Water Evaluation and Planning (WEAP)

Dianeka, Belia Tatika Arno (2025) Optimasi Pengelolaan Sumber Daya Air Pada Sub-DAS Keyang, Slahung, dan Sungkur Kabupaten Ponorogo dengan Water Evaluation and Planning (WEAP). Masters thesis, Institut Teknologi Sepuluh Nopember.

Text 6012231025-Master_Thesis.pdf Restricted to Repository staff only Download (3MB) | Request a copy

Abstract

Sub DAS Keyang, Slahung, dan Sungkur di Kabupaten Ponorogo memiliki luas 328,8 km²; 544,9 km²; dan 314,8 km². Wilayah ini mengalami peningkatan laju pertumbuhan sebesar 0,86% sehingga menyebabkan peningkatan kebutuhan air yang dapat memicu eksploitasi sumber daya air secara berlebihan. Kawasan DAS ini termasuk kategori kritis akibat perubahan tata guna lahan yang mengabaikan prinsip konservasi. Dampaknya wilayah ini mengalami kekeringan saat musim kemarau dan banjir saat musim hujan. Analisis terkait ketersediaan dan kebutuhan air sangat diperlukan untuk menjaga keseimbangan sumber daya air. Pendekatan pemodelan hidrologis menggunakan Water Evaluation and Planning (WEAP) menjadi solusi dalam pengelolaan sumber daya air secara optimal. Penelitian ini bertujuan untuk memperoleh hasil kalibrasi antara debit observasi dan simulasi, menganalisis neraca air eksisting berdasarkan model WEAP, serta membandingkan kondisi eksisting dengan beberapa skenario pengelolaan. Skenario tersebut meliputi perubahan efisiensi irigasi, perubahan masa tanam, dan perubahan alokasi suplai air untuk memperoleh strategi pengelolaan yang lebih optimal. Data yang diperlukan berupa data sekunder yang meliputi jumlah penduduk, luas lahan irigasi, jumlah ternak, data klimatologi, data debit, dan peta lokasi penelitian. Analisis dilakukan untuk menghitung ketersediaan dan kebutuhan air, dilanjutkan dengan kalibrasi model menggunakan parameter NSE, RMSE, PBIAS, dan MAPE. Simulasi dilakukan pada kondisi eksisting serta tiga skenario berbeda untuk mengevaluasi dampaknya terhadap neraca air. Hasil kalibrasi memperoleh nilai NSE sebesar 0,85 dengan kategori baik. RMSE sebesar 5,35; PBIAS sebesar 19,99; R2 sebesar 0,84; dan MAPE sebesar 0,42 menunjukkan bahwa model sangat akurat. Simulasi kondisi eksisting (efisiensi 29%) memperoleh hasil coverage tertinggi pada tahun 2016 di DI Nglorog sebesar 86,19%. Pada kondisi eksisting terdapat defisit air sebanyak 29 DI. Pada skenario I (efisiensi 65%) terdapat defisit air sebanyak 25 DI. Sedangkan pada skenario II yaitu perubahan masa tanam terdapat defisit air pada 23 DI. Pada skenario III yaitu perubahan alokasi supply air terdapat peningkatan defisit air menjadi sebanyak 39 kejadian. Berdasarkan ketiga skenario maka penerapan skenario II menjadi solusi paling optimum yang dapat mendukung pengelolaan sumber daya air di lokasi penelitian.
==================================================================================================================================
Keyang, Slahung, and Sungkur sub-watersheds in Ponorogo Regency cover areas of 328,8 km²; 544,9 km²; and 314,8 km² respectively. This region experienced a population growth rate of 0,86%, leading to an increased demand for water that may trigger overexploitation of water resources. These watersheds are categorized as critical due to land use changes that disregard conservation principles. As a result, the area frequently suffers from drought during the dry season and flooding during the rainy season. An analysis of water availability and demand is essential to maintain the balance of water resources. A hydrological modeling approach using the Water Evaluation and Planning (WEAP) system is applied as a solution for optimal water resource management. This study aims to obtain calibration results between observed and simulated streamflow, analyze the existing water balance conditions using the WEAP model, and compare the baseline scenario with several management alternatives. These scenarios include changes in irrigation efficiency, cropping patterns, and water supply allocation to determine the most effective water management strategy. The required data consist of secondary sources, including population statistics, irrigated land area, livestock numbers, climatological data, streamflow records, and spatial maps of the study area. The analysis involves calculating water availability and demand, followed by model calibration using statistical indicators such as NSE, RMSE, PBIAS, and MAPE. Simulations were carried out for the baseline conditions as well as three alternative scenarios to evaluate their impact on the water balance. The calibration results yielded an NSE value of 0,85, categorized as good. RMSE was 5,35; PBIAS was 19,99; R² was 0,84; and MAPE was 0,42 indicating high model accuracy. The simulation under existing conditions (29% irrigation efficiency) showed the highest coverage in 2016 at Nglorog Irrigation Area (DI) with 86,19%. Under existing conditions, there were water deficits in 29 irrigation areas. In Scenario I (65% efficiency), water deficits occurred in 25 irrigation areas. In Scenario II, which involved changes in planting periods, deficits were observed in 23 irrigation areas. In Scenario III, which involved changes in water supply allocation, the number of water deficit occurrences increased to 39. Based on the three scenarios, Scenario II presents the most optimal solution to support water resource management in the study area.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Alokasi Suplai Air, Efisiensi Irigasi, Ponorogo, Pola Tanam, Irrigation Efficiency, Cropping Pattern, Ponorogo, Water Supply Allocation
Subjects:	S Agriculture > S Agriculture (General) > S600.7.P53 Planting time T Technology > T Technology (General) > T58.8 Productivity. Efficiency T Technology > TC Hydraulic engineering. Ocean engineering > TC812 Irrigation
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Belia Tatika Arno Dianeka
Date Deposited:	19 May 2025 07:17
Last Modified:	19 May 2025 07:17
URI:	http://repository.its.ac.id/id/eprint/119082

Actions (login required)

View Item