Posted in news by fyrephreak on 2009-02-22. Viewed 762 time(s).

The sound of metal pivoting on metal greets me as I slide my pack, and then myself through the wide but very low opening of the center mounted grate, lifted horizontally. There are two entrances to Black curtain, the first is a 2400 RCP, usually submerged at least partway, and a 1200X2400mm duct. Unsure as to the thickness of the ice that covered three quarters of the larger outfall, I opted for the backbreaking route. my uber boots proved useful in providing  less resistance as i slid  instead of walked bent over, for the better part of the backbreaker section.



When walking upright finally becomes an option, a short 1800 RCP leads to the Gravity room,  an extremely oversized Catchbasin that diverts excess runoff into the overflow channel that is the 2400 Submerged RCP. The drain is relatively short compared to the expansive quadrant encompassing ducts that Calgary boats but it has a few neat features that make it interesting. Approaching the partially submerged outfall from the interior i was able to gauge the thickness of the ice to be  well above the requirements to withstand the trespass of a human body. Water marks on the walls suggest that the entire corridor is filled for a good portion of the time, and even now was three quarters filled with ice.

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