One of the best places to build a dam is a narrow section of a deep river valley. The valley sides can then act as natural walls. The main function of a dam structure is to fill the gap in the natural reservoir line left by the stream channel. Sites are usually those where the variance for required storage capacity is minimized. The most economical arrangement is often a composite structure such as a masonry dam with earth embankments. The current use of the flood prone land must be acceptable. Other important engineering and engineering geology considerations during dam construction include:
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