oa Civil Engineering = Siviele Ingenieurswese - Application of a stormwater management program



Use of a microcomputer catchment modelling program designed for stormwater management studies is descriptionbed. The program is a kinematic type model, ie hydrodynamics are based on uniform flow conditions and continuity in conduits. The advantages of modular over finite elements and finite difference models are discussed. The modules in the program include catchments with infiltration, aquifers, conduits with circular, regular or compound cross-sections and storage reservoirs. The modular nature of the program enables alternative combinations of hydrological modules to be assembled ranging from large catchments to urban drainage systems. The program is therefore of use not only for a variety of catchment configurations but also for management studies, ie alternative detention or diversion systems to reduce peak flows and increase catchment recharge. The kinematic equations limit the hydraulic capability, ie backwater computations are not possible, but the resulting equations are suitable for rapid analysis on microcomputers. Routing is achieved by outlet control, but care is necessary to avoid numerical diffusion. An example application demonstrates the versatility in comparing alternative stormwater management strategies in an urban catchment in Sandton. Detention storage and road layout appear to have more influence than disconnected Impervious areas, dual drainage or floodplain storage.


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