BILD Calgary Region Bulletin 2025 – 26
| From: | Mohamad Mohamad |
| Date: | June 24, 2025 |
| Subject: | Updated Requirements for Scour/Abrasion Protection in Storm Manholes |
The City of Calgary is amending the December 2013 Industry Bulletin ‘WATER SERVICES AMENDMENTS TO THE 2011 STORMWATER MANAGEMENT & DESIGN MANUAL’.
Effective immediately, steel or plastic protection plates are no longer required in drop manholes.
Instead, sacrificial concrete benching shall be provided for drops exceeding 1.0 m and design flows greater than 500 L/s. Drop manholes meeting these criteria must have a minimum benching thickness of 150 mm above and independent of the manhole base. Manholes requiring sacrificial benching must be identified in the Stormwater Management Report and on the Construction Drawings. As per the 2013 Bulletin, drop heights shall not exceed 2.0 m and design velocities exceeding 4.5 m/s shall be avoided.
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