The GeoCurve Inlet Filter is a stormwater filter for placement into a stormwater curb inlet for the purpose of capturing debris and sediment that is transported by stormwater runoff. The device is comprised of a filter media (woven monofilament filter fabric) affixed to the lower portion of a “C” shaped 12 gauge welded wire frame (2” x 4” openings) with an upper retention flange. The device effectively filters stormwater, can easily be removed for maintenance and cleaning and incorporates an overflow window for heavy storm events.
The GeoCurve Inlet Filter is an innovative device created by GeoSolutions, Inc. to comply with the new City of Austin requirements while increasing the performance of inlet protection. The device easily installs into the throat of the inlet so that there are no exposed elements to pose hazard to traffic or pedestrians. The GeoCurve shape creates a sediment collection trough inside the throat of the inlet that captures unsightly trash and sediment making for a more aesthetic solution.
Incorporating a high flow filter fabric and an overflow opening that will provide efficient filtering, the GeoCurve still passes high flow during heavy storm events. The Geocurve is easily maintained by removing the device by pulling on the bottom edge of the inlet filter and dumping the captured debris and sediment in a designated location where they cannot pollute our waterways. Once the accumulated debris is removed, it can be reinstalled for continued service.
The GeoCurve Inlet Filter has been hydraulically tested with excellent results. The device was able to pass 350 gallons/minute without backing up water into the street.
When a heavy rain hits, storm drains are our first line of defense against flooding, but Austin's rules have changed.
Carey Witt of Geo Solutions made it rain on a perfectly sunny day, to demonstrate Austin's newest storm drain technology for us. OK, it wasn't really raining, but a high-pressure hose does the trick. The technology is a filter that slides into the storm drain. It captures dirt and trash, so they don't end up in our streams and creeks.
"Typically you see them on construction sites, such as this," said Witt.
The city of Austin recently began requiring these new filters at construction sites. The old version is covered by a thick material that feels like a blanket, held in place with sandbags.
"A lot of the debris that's supposed to be caught by these is not being caught by the device, because it's not working properly," Witt said.
Because the material was so thick, the old filters didn't let enough water through, and that often led to street flooding.
"It sort of creates a dam and so they don't function very well," said Witt.
Other times, the filters and sandbags would break, sending trash and sediment into shoal creek and other waterways. Not so with the new filters, which are made of a strong, rubber-like netting. In our test, it caught most of the debris, and never flooded the street.
"You can see the amount of sediment this device captures," said Witt as he pulled out the filer.
The new filters cost about the same as the old ones, are easily cleaned, and are good for the environment.
"Water goes where it's supposed to, in the storm drain," said Witt.
And trash and dirt stay out. The filters are mainly used around construction sites, which generate a lot of dirt and debris. The new rules went into effect in April 2009.