Abstract :
A great deal of geomorphic transformation and alteration takes place in a matter of minutes to weeks, depending on the size of the river in flood and on the terrain. Since stream channels are ubiquitous and floods inevitable, investigation of the geomorphic effects of floods suggests a number of the most wide-reaching and efficient ways to interpret the past and realize the present earth surface processes. In this paper, the emphasize was placed on many aspects that require to pay attention after the occurrence of floods. One of the most significant measurements were hydraulic estimates. Such as bankfull frequency. It present and integration of geomorphic characteristics of catchment and does not need mean daily rainfall data. These characteristics includ area and shape of catchments; size, length. Slope, and condition of stream channels; overland slope or generalland slop; density and distribution of wate courses; depression storage and channel storage. The type of flow event is very important particularly for big floods occurring in a small catchment. The distinction between a water-dominated flood and a sediment-dominated debris flow is critical due to the type of measurement or estimation. following a flow. Some aspects required a greater attention. These were hydraulic characteristics associated with sediment entrainment and deposition, evidence of debris flows in hilly regions, and well-organized plans for monitoring the postflood recovery of landscape. Finally, a summarized lost of works was recommended for measurements after the occurrence of a flood.
