In 2013 Urban Water Solutions completed the model build and calibration of the Bowral sewerage catchment for Wingecarribee Shire Council.  Located in the Southern Highlands of New South Wales, the catchment covers an area of approximately 1,500ha and services a population of approximately 12,300 via 170km of sewers.

A key outcome of this project was that the dynamic hydraulic model built for the catchment allowed an infiltration and inflow analysis to be undertaken which identified the extent and locations of excessive infiltration and inflows within the system.  This enabled a targeted programme of field investigation work to be developed which in turn led to the development of an infiltration and inflow reduction programme.

In 2016 Urban Water Solutions was again engaged by Wingecarribee Shire Council to assess the effectiveness of its recently completed sewer main and sideline renewals work in reducing infiltration and inflows within the system.  Urban Water Solutions:

• estimated that a reduction of 185Ml/yr in infiltration and inflows had been achieved by the rehabilitation works;
• was able to identify locations within the catchment that would benefit from further investigation with respect to infiltration and inflow; and
• made a number of specific recommendations with respect to Wingecarribee’s ongoing infiltration and inflow reduction program.