Determination of Embankment Minimum Elevation in Teluk Sampit Irrigation Wetland Area

Abstract

The problem for fishpond farmers in Teluk Sampit Subdistrict that lives along the coast is the phenomenon of tidal flooding. The impact of tidal flooding is very detrimental to their fishpond business. Tidal flooding is the event when seawater overflows to the mainland, it can also be defined as a flooded coastal land at high tide. To cope with the effects of the flood, soil embankments are needed as water retaining. The embankment must be able to withstand leaks and be safe from landslides. So, the embankment elevation must be calculated accurately, and the embankment shape must be made in accordance with the planning design. In the harmonic analysis using the least square method, the value of amplitude (A), phase (g*), and S0, M2, S2, N2, K1, O1, M4, MS4, K2, P1 which are tidal components are obtained. The planned elevation of the main embankment is based on the highest water spring (HWS) level plus freeboard 0,5 m. From the important elevation data, it can be determined the elevation of the main embankment is +3,19 m plus freeboard 0,5 m equal to +3,69 m or simplified to be the elevation of +3,70 m.