Abstract
The hydraulic model study to determine the diffuser design for the Boston Wastewater Outfall is described in two papers. The outfall is tunneled with a diffuser consisting of multiport risers, and in this paper the tests leading to the final choice of the riser configuration are described. The study was done in a large density-stratified towing tank. It was found that, for zero current speed with a deep thermocline, a thick, laterally homogeneous, submerged waste field was formed. For widely spaced risers, additional mixing in the plumes following collapse caused the minimum dilution to be higher than predicted by simple plume formulae. As the number of risers is decreased below about 50, the dilution decreases fairly rapidly, but increasing the number above about 50 caused the dilution to increase only slowly. The number of risers was chosen to be 55. This resulted in a savings of about $38,000,000 in construction costs compared to the preliminary design.
Published Version
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