Skip to Main Content
The reservoir of Karkheh Dam is selected due to numerous water quality problems such as eutrophication. It is a large multi-purpose earth dam in Iran on the Karkheh River. The capacity of the reservoir (at normal level) is 5,900 million cubic metres. Figure 2 shows the Karkheh River and its reservoir. Five quality variables – including total dissolved solids (TDS), total phosphorus (TP), total nitrogen (TN), DO and temperature – are selected for this study. Twenty-two potential monitoring stations are selected along the length of the reservoir to sample from different depths (Supplementary Material Figure S1 and Table S5, available with the online version of this paper). The importance coefficients of the water quality variables (γq in Equations (3) and (4)) are shown in Table 2. Each coefficient prioritizes a water quality variable in the quality monitoring program. Once the CE-QUAL-W2 model is calibrated and validated using the historic dataset, it is used to simulate reservoir water quality for 40 years in the period of 1968–2008.
Table 2

The importance coefficients of the water quality variables (adapted from Guideline for Water Quality Monitoring of Dam Reservoirs 2011)

VariablesAquatic life and fisheriesDrinking waterIrrigationPower generationImportance coefficient
TDS *** *** 0.30=8/27 
TP *** ***   0.22=6/27 
TN ***   0.15=4/27 
DO *** 0.22=6/27 
Temperature ***    0.11=3/27 
VariablesAquatic life and fisheriesDrinking waterIrrigationPower generationImportance coefficient
TDS *** *** 0.30=8/27 
TP *** ***   0.22=6/27 
TN ***   0.15=4/27 
DO *** 0.22=6/27 
Temperature ***    0.11=3/27 

Low to high importance is represented by * to ***.

Figure 2

Google Earth view of the Karkheh dam, 2016.

Figure 2

Google Earth view of the Karkheh dam, 2016.

Close Modal

or Create an Account

Close Modal
Close Modal