Abstract

The flood of rivers is a case of climatic hazard which the settlements of river bank are response to it.The study of floods are interesting for hydrologists, engineering and geographers and they try to use their results researches in design the buildings, bridges and other spatial  projects. The dimensions and form of river can guide us to estimate of maximum charge which could appearance. The hydrologists usually use Shesy formulate and slope of a profile and then calculate charges without pay attention to the process which create the form of scours water. Although we know if the other process as ice creates the main dimension of river scours or gorge, our calculations will be wrong. This means that the formative process is very important to analysis, calculating and estimating floods. The most important conclusion of this investigation which is based on a research project in zagross area denote to effective of formative process in result of engineering calculates and without this, the acurenc of data will not be certificate.