Haestad Methods has announced the development of Darwin, a software program for water resources modeling based on an advanced hybrid form of genetic algorithms. Darwin evolves new generations of "fitter" solutions, mimicking the natural selection process while accepting intervention from the user. It allows the evaluation of billions of parameter combinations in a short time. Engineers can utilize Darwin for stormwater applications including determining the most cost-effective design of conveyance systems in StormCAD; scheduling of pumps, model calibrations, and design optimizations in WaterCAD; and rehabilitation and design of sanitary collection systems in SewerCAD. www.haestad.comHaestad Methods.