location of Appropriate Fields for Conducting Flood Spreading Systems by Using Model of Multi Class Maps (A Case Study: South Plains in Ilam Province)

Since long ago, the flood control and artificial feeding of the groundwater aquifers have been amongst the most important goals in the implementation of the flood distribution systems in arid and semiarid regions. On the other hand, determining proper places for running flood distribution systems based on the various scales and indices is of great importance.

In the present study, quaternary units, slope percentage, alluvia thickness, lands’ competence, and lands’ use cases have been calculated as the influential factors and primary scales in locating the regions suitable for flood distribution and artificial feeding on southern plains of Ilam Province and the weight of each of them has been computed using Multiclass Map Model. Then, these layers were categorized in the GIS environment and their priorities were determined in terms of the effect of each factor on the specification of the regions suitable for flood distribution.

The results obtained from the prioritization indicated that the slope percentage, with a weight equal to 52.5, is the most important scale in locating the regions suitable for flood distribution in the study area. Moreover, the results obtained from the combining and weight assignment of the maps showed that 4.5% of the study area is in the very appropriate class, 10.3% is in the appropriate class, 19.3% is in the somewhat appropriate class and 65.9% is in the inappropriate class in terms of flood distribution.