Through the development of a series of optimisation tools, processes and consulting solutions we identify proactive improvement strategies that reduce inflow and infiltration (I&I) across entire urban drainage catchments, using the most effective blend of repairs, replacements, SuDS and lining.
I&I occurs when rainwater (inflow) and groundwater (infiltration) enters the wastewater network through misconnections and pipe defects, increasing the load on the sewerage network. This can cause numerous damages including sewer flooding, polluted rivers, further deterioration and increased operating costs.
The use of optimisation is required when the problem you’re trying to solve grows too big or complex to be solved easily. Working across entire urban drainage catchments, and using advanced mathematics and complex algorithms, our optimisation tools enable us to predict asset performance over time so we can deliver optimised, tailored and proactive intervention plans to the desired performance level, at the lowest cost. This means that we’re able to prevent the problems associated with I&I before they even materialise.
We tailor our models to the outcome required by our clients, whether this is minimising operating costs or the number of asset failures or maximising asset life and combine this with the required minimum service level. Our understanding of I&I, asset deterioration, innovative pipe rehabilitation and optimisation techniques enable us to find the optimal long-term tactical intervention strategies to meet regulatory requirements. Over and above prioritisation, our optimisation tools can compare solutions to different service level and budget scenarios — for example ‘what is the minimum spend in order to maintain current service levels?’ or ‘How much can I improve service levels if I replace with a set amount per year?’ — providing more informed decision making.
The optimisation process is iterative. As the model is fed with data on those interventions that have been built, the knock-on effect on the future performance of the network is analyzed with a resultant new optimised programme of works. We have a rapidly expanding track record with several successful trials in North America, including those for Detroit Water and Sewerage Department.