Numerical Groundwater Flow Modeling for The Intwrgranular Aquifer in Sarsian Sub-Basin, Dokan Lake, Iraqi Kurdistan Region

Volume 15 , Issue 1 , December 2013 , Pages 125-141

Authors

¹ Faculty of Science and Science Education, University of Sulaimani

² Directory of Ground Water- Sulaimani, Iraqi Kurdistan Region

Sarsian sub-basin is located in the northeastern part of Iraq and to the northwest of

Sulaimani governorate, north of Dokan dam between Northing (3987401–4006440) and

Easting (498677–506055), covering an area of 99 km2. It is located within the Dokan

reservoir catchment area. It extends on the left bank of the reservoir along the distance of

19 Km. The main aquifers in the studied area are integranular Quaternary aquifer and

karstic to karstic fissured aquifer of Qamchuqa and part of Sarmord. Based on the

analysis of the available water points, it was found that the general groundwater

movement is from northeast to southwest, with two different directions; one unconfined

and the other confined aquifer. Based on the well tests performed on 14 wells that

penetrate the Quaternary aquifer, it was found that the hydraulic conductivity to be with

median value of 3.445 m/d, transmissivity with median value of 382.95 m2/day and specific

yield with median value of 0.1. Groundwater flow simulation was performed for the north

part of Sarsian Sub-basin in both steady and transient states. The steady-state simulation

is based on lower groundwater level (October 2009). A qualitative analysis of the map

indicates that the simulated and the observed piezometric contours display the same

pattern. The hydraulic gradients obtained from the simulated piezometry are similar to

those of the observed piezometry in the whole study area. The model was run for four

future scenarios of groundwater level. The first scenario of Dokan lake stage was

simulated, and three stress periods of transient simulated with different volume of

extraction per day. From the results, it is obvious that Dokan Lake stage has significant

influence on the head fluctuations in the area.

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