In 2018, the City of Calgary decided to replace the sewer/drainage manhole covers, etc., with artistic covers. The current lid was designed by The current cover was designed by Jeff Kulak and depicts the process of separating waste from wastewater: 4 components of waste - fat, oil, biological components and hazardous materials are eliminated, resulting in pure water, as seen in the artwork.
This cover also appears without the round frame
Additional manhole covers in the same series (and they may also have been made by the same manufacturer)