干旱区生态环境知识资源中心

Water is a subject of great importance for people and their environment. Decisions on the utilization of water depend mainly on its availability, variability and usefulness both in space and time. The situation is more complex in the arid and semi-arid regions of the world. The problem is that in short period it is too much which results in floods, and for long periods it is too little and there is no enough water. Reservoir plays a vital role in controlling floods.

A special method has been utilised in this study to evaluate the flow regimes of the Kardeh River and the possibility of diverting its water for water supply and for irrigation in farms, with different yield-demand situations and probability conditions.

In this study the following analyses are considered:

time-series analysis;

statistical hydrology ( homogeneity test; probability distribution of high and low water; complex analysis of high water period);

special applications (water resources estimation; and reservoir computation for water supply and complex purposes and for flood attenuation).

The daily discharge statistics of the Kardeh river, for the 1964-1989 period, are utilized in this work. Based on the reservoir yield function curves, a suitable size can be selected for the reservoir to meet the water demand at Kardeh. Also the flood attenuation by the reservoir is analyzed, using design flood waves and reservoir simulation. While designing for flood waves of different probability, different weir types and weir sizes are analyzed for different storage levels and base flow during the flood. Moreover, by using reservoir simulation, the so-called 'simulation based on long discharge time series method', different weir types and sizes for different storage levels and base flow are investigated.