Ref: 08/WW/21/11 Price: £29
ISBN: 1 84057 493 3
UKWIR commissioned a three part project, investigating flow regimes in sewerage networks and at sewage treatment works.
Part 1 of the project set out to determine if the measured (Q80) DWF at sewage works can be related to the theoretical industry standard formula PG+I+E, using a set of explanatory variables.
Part 2 looked at how flow to full treatment (FFT) is currently set within the industry and investigated viable alternatives to the current 3PG+I+3E theoretical definition from both a reulatory and design standpoint. This included a specific evaluation of the role of infiltration. Following on from this, part 2 then set out to develop a methodology for evaluating the total (flow / load) impact of a sewage works on the receiving environment to provide an alternative impact based methodology for setting FFT.
Part 3 of the work reviewed previous work on understanding infiltration (including inflow) and its impact on the sewage works and sewer system, From this, it set out to establish robust and reliable techniques for identifying where high infiltration flows affect levels of service for a sewage works or sewer system, along with the associated causes. To address level of service deficiencies, the project also included associated technical guidance on where and when each of the methods would be appropriate and practical, including an associated cost benefit toolkit, to allow whole life costing of potential solutions.
This report covers Parts 1 and 2 of the project and is supplied together with 08/WW/21/12 (Part 3) for £100.