Hi Bruce. I suspect ECM ...
Published by Tim Acland, Anglian Water 1977-2017
Hi Bruce. I suspect ECM means Electronic Content Management and so the reference number is unique to the host system. It is unlikely to be found by the Internet. You will need to find the source system first in order to progress your search unless you are very lucky and someone recognises the reference.
In the UK we have the Sewerage Rehabilitation Manual and now Sewer Risk Management. See the Water Research Centre publications. These are well developed documents used for decades. Water network criticality is also developed and most companies have their own rule sets. Please note criticality is different from 'trunk main'. You can check the Ofwat website for any sewer and water pipeline criticality definitions they apply to the UK water industry for asset management and funding assessment.
Good luck but expect to have to produce criticality rules that suit given local needs. As a rule for critical sewers these would not normally exceed 25% of the total sewer asset base.
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Yes, agree with Tim that this is the internal reference number for a document maintained in-house. It looks like the document is referenced by the New Plymouth District Council in New Zealand in their most recent Stormwater and Flood Protection Asset Management Plan (see Risk Management section starting on page 23 of PDF):
And ECM refers to their Enterprise Content Management system used to manage documents: https://www.technologyonecorp.com/about-us/media/news/articles/new-plymouth-district-council-completes-successful-technologyone-ecm-implementation
You could try contacting New Plymouth directly to see if they can provide you a copy of the document.
Published by Pascual Benito, Ph.D., Senior Hydrogeologist at Montgomerey & Associates