frey hydrodynamics provides services on high scientific level for investigations in running waters, inland waters, and oceanic waters. frey hydrodynamics works out solutions for all questions regarding waters physics on the basis of numerical simulations, scientific data evaluation, and scientific knowhow. In particular, problems in waters can be assessed very exactly by numerical simulations. The hydrothermodynamic simulation model MACH3 developed by frey hydrodynamics is the indispensable tool for investigations and cost-efficient solution optimizations of questions and problems regarding environmental protection, ecology, coastal protection, and hydraulic engineering.