The Miron Construction site on Langdon St, next to the Memorial Union and Lake Mendota, requires special precautions, because it's so close to the lake.
But really, any job on pavement, with a stormwater inlet below, can be considered "next to the Lake." Sediment on pavement runs down the nearest stormwater inlet, then to the lakes via stormwater pipes. Inlet filters are not very effective.
One method we seldom see employed, is to deflect incoming stormwater. Here, runoff from the roof of a nearby building is piped directly to the stormwater inlet.
Miron is pumping muddy water from the construction hole into a tank where it passes through several filters.
From the filter tank, it feeds by gravity to a large bladder of filter cloth. The water leaks out perfectly clear into the storm sewer.
We observed this system earlier after a storm. At that time, there was much more water, with a pump running. Under those conditions, water coming out of the bladder was not clear but muddy.
Miron has built an effective berm around the hole to keep runoff out. This means less pumping and filtering is needed.
Congratulations, Miron!
Photos of how this system works right after a heavy rain here.
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