DEM-GIS Based Geometric Analyses of Kufri Dam, northeastern, Iraq

Abstract

The geometric analyses for each reservoir area represent an important database to aid dam's designers. New Innovated methodology used the Digital Elevation Model of Kufri dam reservoir area to extract the geometric characteristics of the reservoir depending to the analyses of volume-area-level relations of the reservoir depression.
The area that surrounded within the borders of maximum contour line for the reservoir which represent 279 m a.s.l. according to the design of dam, was extracted and exported as a global mapper package file. Then this data file used to extract the elevation data for the hypothetical levels from 258 m a.s.l which represent the minimum operation level, to maximum 279 m a.s.l. with 0.15 m interval, these data was exported as SURFER grid files to derive the geometric elements.
Ten geometric elements were suggested and derived in this proposed methodology, which are the positive volume (for islands), negative volume (for reservoir), positive planar area, negative planar area, positive surface area, negative surface area, residual capacity, average island thickness, and average depth for each corresponding level, in addition to dead storage.
The relationships of the geometric parameters of storage volume, submerged area, surface area, and positive elements were constructed against hypothetical levels and then statistically processed.
The optimum operation and flood levels for the reservoir were selected dependence on the geometric parameters