ABSTRACT:
Hydrological models were applied to extract watersheds and to investigate rainfall computations. There are different techniques for hydrological terrain models. Watershed Modeling System (WMS) and ARC-GIS are commonly used software to simulate and analyse terrain model for extracting watersheds. This research paper applied hydrological models for using two techniques in WMS and ARC-GIS software and extracted a comparative study area between the results of the two different techniques.
Storing water in natural or artificial reservoirs are important for barring water to be useful in many applications as electrical, suppress floods, irrigation, human consumption, industrial use, aquaculture, and navigability. The failure of dam structures may cause disasters loss of life when they occur, so dams are considered as installations containing dangerous forces due to the massive impact of a possible destruction on the civilian population and the environment. Failure of dam is a case study for this research paper. A hydrological model is applied to investigate the track of water flow after dam failure of the dam.  Available data is 30m Digital Elevation Model (DEM) for the study area, extracted from Shuttle Topographic Rader Mission (STRM). The hydrological mode (HEC l) was applied to simulate surface runoff, watersheds that is used in calculating the amount of water stored behind the dam. The research tested the techniques by using two commonly software, WMS and ARC-GIS.
The research investigated the comparative between using water shed modelling system (WMS), (Arc-GIS) to extract watershed, water basin of the study area.
The difference between results of the two techniques shows that the calculations by ARC-GIS are more accurate than calculations by WMS.