“Dry Weather Flow?” What is that?

Description:Hays Creek Sewer (HCS) collects and conveys a significant portion of the City of Prince Rupert's wastewater. It runs the length of the riparian zone of the Creek in McClymont Park. This is a fish-bearing creek that flows into Prince Rupert Harbour. Along the length of the creek, the century-old HCS is either below grade, surface-laid, submerged, or on concrete pedestals. In many locations, HCS actually runs within the creek for a significant distance, often exposed. In the past, sewer line breaks have occurred due to a combination of mudslides and downed trees. Infiltration and Inflow (I&I) factors of 40 to 200 fold have also compounded the issues related to wastewater management. Due to the sensitivity of the of the creek and the fact that HCS is operating many years past its design life expectancy, the City of Prince Rupert decided to reduce or eliminate this risks by upgrading the system and relocating some infrastructure. The ultimate goal for the project is to enable the sanitary sewer system to operate in a safe and environmentally sustainable manner while enhancing, where possible, the local environmental habitat. The City has undertaken a three-phase project that includes installation of two new pumping stations and a number of new sewer lines. The I&I issue has turned out to be the single most challenging aspect of the upgrades.

Authors: Arash Masbough

Subjects:

Tags:2014 Annual Conference,AC14,AC2014

Citation:Stream D. 4.6.

Publication Date:May 5th, 2014 Upload Date:Jun 30th, 2014

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