Geometric Analysis of the Suggested Derlock Dam, DuhokReservoir using a Digital Elevation Model

Abstract

Several application programs, including Global Mapper, Surfer and GIS, which deal with spatial analysis and extract spatial data and information for land features, were used to extract geometric elements of the proposed Derlock Dam reservoir based on the digital elevation model (DEM) with a discriminating ability of 10 m. It started at a level of 740 m at the site of the dam and reached a height of 900 m above sea level with an interval of 10 m. The relationship of the level with the negative volumetric and negative spatial elements showed that there is a large difference in the values of Negative Volume (NV), Negative Planar Area (NPA), and negative surface area (NSA) at the level of the reservoir (900 m), which is a positive factor in choosing the topograph Negative Surface Area depression, as it shows a significant decrease in the surface area (evaporation area) and the wet area (the area of penetration). This corresponds to a significant increase in the volume of the reservoirs, and indicates that the depression is deep and small in area, as well as the final economic feasibility of the project. It consists of two reservoirs, which will allow a strategy to maneuver the amount of water storage, as well as reduce the risks of flood waves and sediments that will be deposited behind the dam gate. The reservoir volume reached 900 m, 3611048537 billion m3, distributed among reservoirs near the dam with volumes of 445189305 million/m3 and 3166195232 billion/m3 for the reservoir far from the dam site, because the Upper Zab River does not have dams, so it will be able to build important reservoirs and control the river water during floods.‎