Based on the result of the research, the hydraulic gradient in one of the ZRO system in the research location is 0.4, and the saturated hydraulic conductivity of 2.61 × 10⁻⁵m/s shows that the soil in the research location is moderately coarse or loamy textured. The saturated hydraulic conductivity was determined using the falling head approach. Groundwater levels are measured interactively using an aqua plumb liquid level sensor with data logger recording.
This approach requires hydraulic gradient data obtained through measurements of groundwater levels around the ZRO system using two monitoring wells and hydraulic conductivity data of saturated soil. Groundwater recharge in the Zero runoff system (ZRO) was determined using Darcy's approach. For this reason, it is necessary to implement a zero run-off system technology that can minimize surface runoff through increasing groundwater recharge. Land use for cocoa cultivation can increase surface runoff by 389% compared to forest land. One indicator of the decline in watershed performance is the increase in the ratio of maximum discharge to minimal discharge due to major surface runoff when rain occurs.
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