Seepage in Soil From The Difference Of Water Viscosity Using Geo-Studio SEEP/W Program

Soil is important material for human life. The problem that is often encountered with soil is soil contamination due to discharge of leachate into soil. This research aims to observe the influence of leachate viscosity on seepage using Geo-Studio Seep/W Program. The samples of leachate were taken from ceramic industry and from Suwung landfill site. Soil samples were silty sandy taken from Ida Bagus Oka street, Denpasar, Bali. Seepage modeling in Geo-Studio SEEP/W was conducted on silty sand condition using pure water (without leachate), leachate from ceramic industry, and leachate from Suwung Disposal Site. Seepage modeling on Geo-Studio was conducted on saturated/unsaturated condition. It was found that the leachate viscosity was different each other. The viscosity of leachate from ceramic industry was 0.01366741 N s/m2 and 0.002061309 N s/m2 from Suwung Disposal Site. Due to mixed with leachate, soil hidraulic conductivity decreased from 0.001949 cm/s to 0.0001029 cm/s. The largest discharge and velocity of seepage on silty sand material from Ida bagus Oka street, Denpasar, obtained by using Geo-Studio Seep/W Modeling was produced by pure water (without leachate), whereas, the smallest one produced by leachate from Suwung landfill site. The influence of seepage discharge and seepage velocity change on silty sand in Ida Bagus Oka street, Denpasar due to flowed of leachate from ceramic industry and leachate from Suwung Disposal Site againts pure water seepage discharge and seepage velocity are 70,573% and 5,313%.