Abstract:
The increasing demand for raw water in educational areas, especially in the north of Bandar Lampung, has led to potential water crises and environmental problems. One of the early symptoms is the emergence of inundation points to new floods every year due to natural infiltration ponds that have not been able to accommodate excess rainwater and overflow. This study aims to design a conservation reservoir from a natural pond located in the educational area of the University of Lampung. The data used are rainfall data from rain stations with a data range of 10 years, soil type data, cohesion value (c), internal shear angle (f), specific gravity (Gs), water content (w), and soil density (?). The reservoir design method includes hydrological and stability analysis. The ideal flood discharge analysis results according to the conditions at the research site are between 0.0847 - 0.7051 (m3/s) for 24 hours for a repetition time of 10 years. The storage volume calculation with the current water level data is +110.00 m at 34777.5620 m3. Analysis of flood discharge on the selected spillway building is the Ogee type with a repetition time of 10 years, and the outflow discharge occurs at the 8th hour with a discharge of 0.2704 m3/s. At the same time, the results of the analysis of the stability of the reservoir against landslides in three conditions obtained the values of Fs = 4.3087, 3.3797, and 1.7924 for the newly built condition, the condition of the reservoir in the event of a sudden decline, and the condition of the reservoir being fully filled, respectively. These results indicate that the reservoir design can be realized under stable conditions with Fs above the safe threshold (> 1.2).
Page(s):
105-111
DOI:
DOI not available
Published:
Journal: Science International, Volume: 34, Issue: 2, Year: 2022
Keywords:
Water
,
reservoir
,
Conservation
,
Northern Bandar Lampung