Hastings Brick Arch Sewer Rehabilitation

A brick arch sewer (circa 1890) which also conveyed ground water was programmed for renewal by Hastings District Council (HDC) in 2012 with a 600mmØ RC pipe. During the investigation and planning phase MWH identified that renewal with the 600mmØ RC pipe was a high risk- high cost option. Following this MWH proceeded to investigate alternative options that would still meet HDC’s requirements. This paper describes the investigation and planning phase, optioneering, risk analysis and early involvement with specialist pipe rehabilitation contractors which resulted in an alternative approach. This approach resulted in the trunk main itself being rehabilitated using Cured in Place Pipe (CIPP) liner.

This paper describes the investigation and planning phase, optioneering, risk analysis and early involvement with specialist pipe rehabilitation contractors which resulted in an alternative approach. This approach resulted in the trunk main itself being rehabilitated using Cured in Place Pipe (CIPP) liner.

The four well beings, economic, social, cultural and environmental were all taken specifically into consideration and were incorporated in to the contract document as key performance indicators. The total cost to complete the project was well below budget. All risks identified in the planning phase were either mitigated or minimised throughout the project. Disruption to the public and a number of large industries in the area was minimal and well managed. Ultimately this alternative approach was a success in every respect and met all of HDCs expectations and requirements.