Hydraulic analysis and design of manifold pipelines as multiple outlets submains in a water distribution network system, often referred to as manifolds, laterals or gated pipes, are extensively used in profession practice, has been a major problem tackled by many authors. This paper presents a new mathematical model -stepwise computation algorithm- with software application regarding discrete-non-uniform outflow distribution approach for evaluating different forms of pressure head-discharge distributions along the sub-main line, and the required hydraulic flow characteristics along the energy-grade line, that takes into account to the velocity head change and variation of the Reynolds number, which affects the selection of the proper friction coefficient formula to be applied along the different reaches of the pipeline. Resulting, the improved user-friendly computer program in Visual Basic 6.0 language named Multi-flowCAD was developed for hydraulic analyzing and designing of multiple outlets sub-main lines regarding certain hydraulics and uniformity criteria. The present computer-aided computing technique can be efficiently used with the highest accuracy for different forms of pressure head profiles covering various design configurations regarding different flow regimes and uniform line slope situations with respect to alternative computing techniques, because only the basic equations of the hydraulics of steady-state pipe flow condition, were sensitively used in each pipe section between successive outlets. In profession practice, the present improved software simulation model is the most suitable, and can be efficiently used for hydraulic analyzing and designing of various types of multiple-outlets pipelines in sub-main distribution networks, for all performed simulations.
Anahtar Kelimeler: Algorithm, Steady-state analysis, Water distribution network, Manifold flow, Software.