Department of Civil Engineering,Iran University of Science and Technology
Abstract. This paper employs the Particle Swarm Optimization (PSO) method to solve the problem
of the optimal design of cascade stilling basins. PSO is a relatively recent heuristic search method whose
mechanism is inspired by the swarming or collaborative behavior of biological populations. The objective
of this research is to minimize the total construction cost of cascade stilling basins, which is a function
of height of the falls and length of stilling basins, while fullling the hydraulic and topographical criteria.
To illustrate the application of PSO, a benchmark design is taken from the work of Vittal and Porey 
on a cascade stilling basin for the Tehri Dam, India.