In order to determine the height of the filter in heterogeneous earth dam, three embankment models were provided in a flume laboratory, with the length of 4.2 m at the base of dam, the width of 60 cm and the height of 1 m and body slope 1H: 2V. For embankment of model, two types of fine and coarse grained soils were used. The texture of the soil was made using hydrometer method. In the first model, the fine-grained and coarse-grained soils were used in downstream and upstream of the dam crest...