Water resources/reservoir management in developing countries attracts considerable attention due to growing human requirements and environmental concerns. The Seimare–Karkheh hydropower reservoir cascade, in the Karkheh River basin southwest of Iran, was studied. The impacts of changing reservoir operating water levels on hydropower generation and downstream environmental requirements were evaluated under different climate change conditions. For several years, the operating water level of Seimare reservoir was 704.5–720.0 metres above sea level (masl) (H1). Decision makers then adopted a different policy, with the operating range changed to 704.5–723.0 masl (H2). More recently, decision makers reduced the normal and minimum water levels so the reservoir now operates at 695.0–704.5 masl (H3). It was found that, for the period 2006–2050, based on H3, hydropower production would be reduced by 2.3–12.1% and 2.4–12.6% compared with policies H1 and H2, respectively. In 2051–2100, these reductions were found to be 5.8–11.2% and 7.7–11.3%, respectively. Furthermore, the results demonstrated that the current policy would substantially affect downstream hydrological alteration: 60–72% in Seimare River and 48–66% in Karkheh River for the period 2006–2050. The issue was found to be more pronounced in 2051–2100, with hydrological alteration of 68–73% in Seimare River and 59–66% in Karkheh River.
Long‐term hydrological data are important elements in water resource planning and management. The hydrometric data record period in Iran varies from a few years to about 60 years; generally inadequate for long‐term planning. Reconstruction of meteorological data using tree‐ring proxy records is a viable technique in extending meteorological data in the past (i.e. backcasting). This study reconstructed the precipitation and temperature data based on the tree‐ring proxy records over the 1710–2000 period in Kermanshah Province, Iran. Furthermore, using WASMOD water balance model, streamflow and other hydrological water balance components were reconstructed. In the study basin, the average monthly streamflows were determined as 6.25, 5.56 and 5.50 mm for the eighteenth, nineteenth and twentieth centuries, respectively. While the eighteenth century was the wettest, in nineteenth and twentieth centuries the streamflow reduced by an average of 14% compared to that of the eighteenth century.
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