GENERAL HYDRODYNAMIC MODEL FOR SEWER CHANNEL NETWORK SYSTEMS/

A general hydrodynamic numerical model for sewer/channel networks is p resented. The Priessmann Slot assumption is adopted to extend open cha nnel flow equations to closed conduits under surcharged conditions. Th e ''superlink'' algorithm with a staggered grid, implicit scheme is de veloped to improve the stability and speed of the computation. The SUP ERLINK computer model was established without omission of any terms in the St. Venant equations under bath subcritical and supercritical how conditions. The model reduces the order of the sparse matrix equation so that a considerable savings in computational effort is achieved. T he numerical experiments show that the model is robust and tellable, a nd produces consistent results under different grid setups. The applic ation to a large looped sewer network shows a reasonable agreement wit h field measurement. A comparison between the results from the SUPERLI NK and the SWMM EXTRAN model demonstrates that while maintaining the c omputational stability and accuracy, the computation can be sped up us ing the SUPERLINK algorithm for the sewer network system, which experi enced a wide variety of hydrodynamic conditions.