Author(s): T. M. Dick; J. Marsalek.
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Keywords: No Keywords
Abstract: A review of recent data on head losses at sewer manholes indicates that for individual junction types with favourable pipe alignments, the most important geometric factor affecting the head loss magnitude is the benching inside the manhole. Consequently, the head loss data from various sources were classified according to the benchings into four basic groups. These data can then be readily used in flow routing in surcharged sewer systems. For this purpose, the EXTRAN routing model was used. Although the model does not allow an explicit consideration of junction head losses, such considerations can be accomplished indirectly by using the equivalent pipe roughness. The inclusion of junction head losses in the analysis leads to more realistic computational results which indicate a lower system capacity, higher elevations of the hydraulic grade lines in some parts of the system, and greater outflows of stormwater from the junctions which are fully surcharged to the ground surface.
Year: 1985