ABSTRACT
This chapter describes the principle of some standard methods of standard regional water-system design. It shows a modern alternative to the standard design methods. Capacities of water systems are designed with the help of general guidelines with respect to discharge, surface-water storage and frequencies of extreme water-system loads. Two main methods are applied in water-system design at the moment: design on the basis of critical discharge and design on the basis of dynamic discharge. Designs based on the dynamic discharge method, require a dynamic model that represents the actual or future situation in the water system. A sufficiently detailed model is needed to determine the runoff quantities as a function of time. Integrated dynamic discharge models include the various subsystems and the regulating structures of a water system. The dynamic design procedure requires time-series calculations to include delays in runoff and incorporate the situation preceding system failure, such as saturation of the soil.
