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Pervious pavement allows rain water to soak through it rather than running off. This type of pavement is known to reduce polluted stormwater runoff going to urban streams by infiltrating water into the soil below. But can it have benefits in areas where the soil drains too slowly for infiltration? We studied water quality and road conditions from test sections of pervious pavement on a large arterial road in Gresham, Oregon that is on top of slowly draining soil. We compared road sections of: A) conventional asphalt, B) 8”-think pervious pavement with an underdrain, and C) 3”-think pervious pavement on top of conventional asphalt. We found that runoff from both types of pervious pavement had lower levels of several pollutants of concern than runoff from conventional asphalt, including sediment, bacteria, nutrients, and heavy metals. The pollutant reduction of the pervious pavement was found to be similar to, or even higher than, reductions from other stormwater management practices in Gresham. Additionally, we noted that both types of pervious pavement had fewer potholes, less road spray, and less road noise than the conventional asphalt. This study indicates that pervious pavement can have multiple benefits to urban stream water quality as well as local road conditions, even when the soil below it drains too slowly for infiltration.
11:15am - 12:00pm
Two City Departments and College Come Together for a Win-Win-Win Project
Murraysmith, Inc., United States of America;
Basement and street flooding have been a significant problem as a result of Everett’s 100+ year old combined sewer system. The City has been systematically addressing the problem with several construction projects in recent years. Being adjacent to the City’s Legion Memorial Golf Course, a neighbourhood in Northwest Everett had the unique opportunity to combine the City’s sewer/stormwater infrastructure needs with the renovation of a portion of the City-owned golf course.
A preliminary study of the area confirmed the ability to separate the stormwater system and convey flows to detention ponds located in the golf course. A golf course architect was brought onto the design team and the project proceeded, which included four new holes and introduction of a pond network on the course to improve playability and aesthetics of the course. Water now strategically comes into play on three of the four new holes and the three new ponds serve as stormwater detention ponds, capturing up to 5.4 acres feet of runoff.
Currently, control structures release runoff back into the combined sewer system. Future phases of the project are anticipated and could include additional separation projects at Everett Community College, and ponds within the golf course, utilizing stormwater for course irrigation and diversion to a stormwater outfall.
This presentation will discuss the origins of the project, how the City’s Utility and Parks department came together to define a win-win project that takes maximum advantage to the City’s resources and how the project was implemented, which required input from the golf community, the neighbourhood and the adjacent Everett Community College.