Debris flow occurs in the downhill area of Merapi in Central Java is very dangerous threat that threatens human life, and destroys infrastructure facilities. Modeling of the debris flow in that area can be approximated by Eulerian continuous flow equations and discretized into dynamics systems model. This paper present the dynamic systems model and a strategy for estimate the distribution of the debris flow by Ensemble Kalman Filter (EnKF) that is combine with measurement data. The number of measurement points obtained by applying EnKF on several PDE which are part of Navier-Stokes equation. The EnkF method is prepare for prediction of debris flow distribution on Merapi Volcano downhill in Central Java using the combination of one and two dimension model of debris flow.