Hydraulic design of Embung Facei in North Ternate

Abstract

In order to deal with the groundwater crisis problem in the following years, countermeasure of constructing Embung Facei in North Ternate is required, specifically to recharge the aquifer for conservation purpose and to support daily domestic needs. The first step is to start with water availability analysis for knowing how much water can be conserve and how much excess water that can be used to supporting domestic water needs. Based on standard, Embung Facei is designed with 100 return period, and for the result, Embung Facei has 5.85-meter height, including 0.75-meter of freeboard and it has capacity to store 41,801 m3 of rain water and sediment. Meanwhile the spillway has 5.1-meter height with 6-meter width, and for the distribution pipe will be installed on elevation 57.91 meter above mean sea level or 1.21-meter height from the lowest reservoir floor. In addition, the unused water in Embung Facei catchment area is 0.065 l/sec and will be supplied on wet season only, which can support 1.429% level of service in public hydrant water demand in 2025.