This document is applicable for dam plants including their appurtenant works and storage rerservoirs. It deals with overlapping and generally applicable requirements with respect to all types of dam plants. Specifications for different types of dam plants are given in the other parts 11 to 15 of this standard. In this part 10 the principles for design, construction, operation and control for new plants are given but in addition also for existing plants and their alterations in construction and operation.