Deposits made in or out a stream s channel are called bars, channets fill and natural levees.They are mounds of gravel and sand that form shoal near the stream. Deposits so formed, when exposed during the low-water stage of a stream, are the familiar sandbanks or pebble beachs etc., At the high-water stage, they are subject to a shift in position or an alterat ion in form.
They form a low ridge, which is seldom more than a few decimeter higher than the backland. On the backland, there are a fine grain deposits, therefire, in the case of the stream's deposits, the microtopographies are exposed clearly by the facies deposited on the top surface.
The above-mentioned micrototiographies, characterized by the deposited facies, will serve useful purpose for a engineering geologists.