Southern Water was able to significantly improve levels of service and redirect valuable resources into other projects within the service area thanks to experts from ARCADIS and their utilization of Optimizer™.
Nitrates are slowly becoming more of a concern in certain areas of Southern Water’s service, especially in conjunction with recent Environmental Agency (EA) acceptable levels. As a result, Southern Water’s planning team alongside experts from ARCADIS utilized the Optimizer™ Platform to analyze the problem and identify cost-effective solutions. The Strategic network study area was comprised of 118km of 150-700mm pipe with 13 reservoirs, 11 groundwater sources, and a major import from a neighboring water company. This network supplies 96,000 properties.
Initial estimates included the construction of 4 nitrate treatment facilities, resulting in a large capital expenditure. Additionally, OFWAT had also challenged the utility to increase network resilience. The Southern Water/ACRADIS team defined a resilience methodology to identify appropriate risk drivers and determine the resilience response while allowing for consideration of a variety of interventions.
Hazards to mitigate, such as floods, critical asset failure, contamination, raw water loss, malicious damage, and site communications, were evaluated for water supply works, service reservoirs, booster pumps, and trunk mains with varying levels of stress applied. Optimizer™ was then configured to evaluate various combinations of new trunk lines, new raw water supply lines, and nitrate removal plants. Resulting analyses revealed solutions that perform 50% better than the initial baseline design and cost 30% less.