Particle Accumulation Rate of Drinking Water Distribution Systems Determined by Incoming Turbidity

Particulate material accumulates in drinking water distribution systems (DWDS) and this can cause discolouration. To minimize customer complaints it is required to understand the influencing factors and determine an appropriate flushing frequency. The accumulation rates of two comparable DWDS were examined. Area A with a constant incoming water quality experiences a steady accumulation rate; area B with a more variable incoming water quality has a variable accumulation rate. The difference in accumulation rate is proportionate to the difference in the particle loading of the two areas and is thus largely determined by the difference in incoming water quality. The water quality into a DWDS is not only determined by the treatment works, but also by the material accumulation and resupsension in the trunk mains supplying it. Monitoring the particle loading of a DWDS part can help in determining the required flushing frequency.