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Flood,polution,decrease water quality, sedimentation erosion on Karang Anyar drainage basin, Tarakan city.The width of Karang Anyar Drainage Basin is 728,28 Ha, where it is divided by fifth zones.Issue on that drainage basin is river is the rubbish river, river boundary line,flood, sedimentation and decrease water quality. Result of the water analyze show Fe,CL. TSS,BOD,COD very high in polution river.. Result of the land analyze show that Na,P, S, show fertile level is low. Analyze erosion and sedimentation with potential sediment is 4.365.1456 ton/annual where show level erosion very highly. Especially for land use for residence, plantation, rearing, prevention can do with vegetation and technic. And we make model for overcome Karang Anyar drainage basin.So with model and sensitivity analyze we can use AHP for that. Result of this case for first zone is need retainning wall, normalisation for every zone and reboasation in first zone too in upstream of river. Replantation for first zone untill fifth zone.
Keywords : Retainning wall, normalisation, reboasation, replantation, model
