BMP Monitoring Sites - Urban Drainage and Flood Control District

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UDFCD BMP MONITORING SITES Porous Asphalt Pavement gravel, #3 gravel and C-33 sand. In a trench beneath the sand, a perforated pipe collects the filtered water and conveys it to a catch basin. There is an orifice plate at the end of the pipe where a pressure transducer measures the flow into the catch basin from the porous asphalt pavement. There is also a weir plate at the outlet of the catch basin with a levelogger that measures the flow leaving the catch basin. The difference between the flow passing the orifice plate and the flow passing the weir plate is equal to the runoff that bypassed the porous asphalt pavement and entered the catch basin through the grate. The sampling equipment is stored in a metal box in the island adjacent to the porous asphalt pavement. A rain gage on a post near the storage box measures rainfall and signals the ISCO sampler inside the box to begin sampling after 0.1 inches of rain falls. The sampler then draws a sample of water from the porous asphalt pavement runoff after a designated flow has passed, and then every 15 minutes until 12 hours after the storm has ended. There is also a control watershed located a few hundred feet northeast of the porous asphalt pavement watershed. The control watershed consists primarily of traditional asphalt pavement and is used to compare results of treated runoff to untreated, direct runoff. Stormwater runoff from the control watershed is collected in a grated catch basin located in the northeast corner of the parking lot. The water leaves the catch basin by passing through a weir plate where a pressure transducer measures the flow. The sampling equipment is stored in a metal box adjacent to the parking lot in a manner similar to the porous asphalt pavement sampling configuration.
UDFCD BMP MONITORING SITES Porous Asphalt Pavement Test Site Location The porous asphalt pavement test site is at the Denver Wastewater Management building located at 2000 W. 3 rd Avenue in Denver. The pavement is located in the turn-around in front of the building’s main entrance, on the east side of the island. Map this Location The watershed area tributary to the porous asphalt pavement is 12, 180 square feet, with the porous asphalt taking up 1840 square feet of that area. The watershed consists primarily of impervious areas, including buildings, parking lots and paved areas.
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BMP Monitoring Sites - Urban Drainage and Flood Control District

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