Study of Hidrology Nunukan Raw Water Retention Basin in North Kalimantan

Abstract

Abstract Water is the source of human life. Therefore it is necessary to make optimum use of it to preserve existing water sources. Raw water demand is influenced by high population growth. The need for raw water in Nunukan Regency is increasing from year to year. Raw water needs in Nunukan Regency are met by utilizing water sources from rivers, wells and rainwater. The available water sources is limited, while the population of Nunukan Regency continues to grow. Therefore, to meet the needs of raw water in Nunukan Regency, a reservoir is needed in the area. One of the elements that must be analyzed in the reservoir design is the hydrological potential that exists including the inflow that fills the reservoir, storage capacity, and flood discharge plans. The analysis results obtained that the volume of water that can fill the reservoir is 0.235 × 106 m3, while storage capacity is 0.013 × 106 m3. Flood discharge plan with a 100-year return period of 4.701 m3/second.