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This study aims to analyze the problems that occurred in the area of Sentani Lake, including the erosion in the watershed, increased the sediment deposition and its relation to the silting up of the lake. The purpose of this study is to provide information to stakeholders, especially related to the preservation of Lake Sentani. These study results explained that the Lake Sentani experiencing silting caused of the deposition of sediment. Results of the mapping erosion potential is to provide information that the highest erosion potential of between 60 to 180 tons per hectare per year in the north of the lake, they are areas that have a high degree of slope. The lake of suspended solids concentration (TSS) between the top layer and the bottom layer there are significant differences in the upper layer of the TSS concentrations ranging from 20 milligrams per liter to 320 milligrams per liter while the bottom layer of the TSS concentrations ranged from 80 milligrams to 410 milligrams per liter liter. TSS concentration in the top layer at the inlet is significantly different from the TSS concentration in the outlet at the inlet ranged from 300 milligrams per liter to 320 milligrams per liter, while in the outlet TSS concentrations ranged from 20 milligrams per liter to 50 milligrams per liter. TSS concentration in the bottom layer at the inlet is significantly different from the TSS concentration in the outlet at the inlet ranged from 350 milligrams per liter to 390 milligrams per liter, while in the outlet TSS concentrations ranged from 80 milligrams per liter to 170 milligrams per liter, while in the middle of the lake that is the ultimate in having the highest TSS concentrations ranged from 390 milligrams per liter to 410 milligrams per liter. Water flow rate was measured on two layers near the surface and near the bottom of the lake. There is a significant difference between the flows rates in the second layer, which is the rate of flow in the upper layer ranged from 6 cm to 22 cm per second per second while the bottom layer ranged from 2.7 cm to 16 cm per second per second. The flow rate in the two layers have different characteristics, the flow rate in the upper layer has greater ranging from the inlet toward the outlet of the lake while the flow in the bottom layer from the inlet to the lake center the flow rate increases.

Sentani Watershed Erosion Potential Study and Suspended Solid Distribution (TSS) In Connection With Lake Silting