My house, which is in an urban area and was built in the early 80s, has a sump pit in the basement. When we moved in, we noticed that the grate was covered with paper -- obviously to keep the odor out. This of course kept it humid and resulted in some serious rusting of the cover. It also probably contributed to the odor problem by slowing down evaporation of water in the pit. Anyway, I prefer not to cover the holes in the grate.
There is no pump...it appears to be a groundwater "pit" with three feeds and a large discharges through a pipe via gravity after the water rises to a certain level. This pipe goes towards the front of the house and presumably to the storm sewer out front. My neighbourhood has separate sewers for sewage and storm water.
How are these systems usually vented to prevent odor? Is there some kind of check valve or a float or something? My neighbour has the same thing and says it doesn't smell....and he would be connected to the same storm sewer.
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