PEMANENAN AIR HUJAN BERBASIS ATAP BANGUNAN UNTUK KEBUTUHAN AIR DOMESTIK MASYARAKAT KAPANEWON GIRIMULYO
Fina Afifah Nurul 'Aini, Dr. Emilya Nurjani S.Si., M.Si.
2026 | Skripsi | GEOGRAFI DAN ILMU LINGKUNGAN
Water is an essential resource for sustaining human life and supporting domestic activities. Increasing population growth has led to a rising demand for water, particularly in areas with limited water availability such as Girimulyo District, Kulon Progo Regency, Indonesia. Rainwater Harvesting (RWH) has emerged as a potential alternative water source to address this challenge. This study aims to analyze the potential water availability from a roof-based RWH system, evaluate domestic water demand, assess the contribution of RWH to meeting domestic water needs, and project future water demand and availability over 5-,10-, and 20-year periods. A quantitative approach was employed using rainfall data, roof area, and runoff coefficients to estimate water availability, while domestic water demand was calculated based on per capita water consumption obtained through interviews conducted using accidental random sampling.
The results indicate that the potential annual water availability from the RWH system reaches 36,88 million m³ and 28,98 million m³ under maximum rainfall conditions with 60% and 80% rainfall probabilities, respectively. Under minimum rainfall conditions, the harvested water volume decreases to 293,489 m³/year and 250,444 m³/year. The total domestic water demand in Girimulyo District was estimated at 1.25 million m³/year. The findings reveal that the RWH system is capable of fully meeting domestic water demand during periods of high rainfall; however, under minimum rainfall conditions, it can only satisfy approximately 19–22% of the demand. Future projections show that domestic water demand will increase from 1.31 million m³/year to 1.47 million m³/year over the next 20 years, while water availability from RWH is projected to remain substantially higher, ranging from 11,23 million m³/year to 13,42 million m³/year. These findings demonstrate the significant potential of roof-based RWH systems as a sustainable alternative water supply strategy for supporting domestic water security in water-scarce areas.
Kata Kunci : Kata Kunci : Sistem Pemanenan Air Hujan, Ketersediaan Air, Kebutuhan Air Domestik, Pemenuhan Air Domestik, Proyeksi Kebutuhan Air