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Case Study #13 - Water Quality
 
 
Humegard™ treats Hawera stormwater.
 
Project Name: Hawera Gross Pollutant Trap
 
Principal: South Taranaki District Council
 
Consultant: Apex Consultants Hawera
 
Contractor: Works Infrastructure
 
Project Location: Collins Street, Hawera
 
Installation Date: March 2007
 
Product Data: Humegard™ HG15/L
 
Project Summary:
 
A Humegard™ gross pollutant trap has been installed in Hawera’s drainage system and is playing a key role in improving the quality of stormwater that discharges from an existing public stormwater drain into open watercourse that flows through private property.
 
Council’s main objective was to stop litter and coarse sediments being deposited in the affected resident’s back yard thereby improving aesthetic value of the watercourse as well as removing harmful pollutants that affect the environment of local fauna.
 
The HG15L model is one of four minor gross pollutant trap units within the Humegard™ range that generally treat flows from pipe sizes between DN225 and DN525. The unit was manufactured at Humes’ Papakura manufacturing site where it was trial assembled prior to being delivered to site in three sections – base section, top section and lid. Standard circular manhole risers were then utilised to provide access from finished ground level.
 
 
Kor-n-Seal rubber connectors were supplied as part of the unit to facilitate field connection to the pre-existing DN450 concrete pipes. For this specific site, due to the steep grade of the existing stormwater line, the HG15L provides a treatment flow rate of 80 litres per second. For installations on shallower grades the treatment flow rate increases up to a maximum of 160 litres per second. Pollutant storage capacity of the HG15L is 3.0 cubic metres.
 
Humes representatives worked closely with the specifying consultant (Apex) to ensure that the appropriately sized Humegard™ was specified. During installation a Humes representative attended site to assist contractor with assembly and ensure correct placement of the unit.
 
Following installation the Humegard™’s maintenance frequency is between 6 and 12 months depending on the pollutant load coming off the catchment. Maintenance is carried out from ground level using a sucker truck and does not require confined spaces entry for a normal clean-out operation.
 
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