Search results for "BMP Post Construction"
Browse All
Sort by:
By Steve Goldberg Protecting Lake Lewisville Rural Texas contains a number of what are termed “farm to market” roads, or “FM” for short. FM 720 is one of those roads, located in Denton County, just northeast of Ft. Worth. The Texas Department of Transportation (TxDOT) is in the process of upgrading the roadway because of population growth in the area. “They’re expanding FM 720 from two to four lanes. Where the road crosses Lake Lewisville, there is an existing double-lane bridge over the lake, and TxDOT...... continue reading
From: Stormwater Topics: BMP Manufactured, BMP Post Construction, Pollutants
By Steve Goldberg Theoretically, rainwater harvesting and reuse has a number of tangible benefits: * It’s a free source of water that can be obtained with something as simple and inexpensive as a rain barrel collecting rooftop runoff. * It can reduce the load on stormwater systems, which can in turn result in fewer pollutants entering local bodies of water. * It can decrease the use of potable municipal water for nonpotable needs. * A lot of energy is required to obtain, clean, and transport water; if d...... continue reading
From: Stormwater Topics: BMP Manufactured, BMP Post Construction, Low-impact Development
By Jeff Gunderson, Robert M. Roseen, Thomas P. Ballestero, Alison Watts, James Houle, and Kim Farah Subsurface gravel wetlands (SGWs) are an innovation in low-impact development (LID) stormwater design gaining significant recent attention. These horizontal flow systems take advantage of important biochemical nutrient cycling functions necessary for treating nonpoint-source pollution. SGWs approximate the look and function of natural wetlands, with high efficacy for removing sediments, nutrients, ...... continue reading
From: Stormwater Topics: BMP Post Construction, Low-impact Development, Research
By Gary R. Minton Stormwater treatment in cold-climate regions involves considerable additional difficulties than with similar treatment systems in semi-arid and wet climate regions. Cold regions can be defined by Figures 1 through 3. Figure 1 presents air freezing index values, which are the cumulative degree-days below 32°F (0°C). It has been suggested that ice cover will occur on lakes in regions with values greater than 100. Figures 2 and 3 present annual snowfall depths and length of freeze ...... continue reading
From: Stormwater Topics: BMP Post Construction, Maintenance, Research
By Don Talend Low-impact development (LID) for stormwater management becomes a bigger challenge when a site has limited space. Such is the case at a high-profile sports project in California’s San Francisco Bay Area. The site of a new stadium for the National Football League’s San Francisco 49ers in Santa Clara, CA, used LID. The stadium will be built on a highly developed, constrained 32-acre site near the California’s Great America theme park in Santa Clara, among other developments. The $1.02 billion...... continue reading
From: Stormwater Topics: BMP Manufactured, BMP Post Construction, Low-impact Development
By Janet Aird A vast amount of creativity goes into the engineering of separation devices that filter debris and pollutants from stormwater runoff. This is especially the case when the job is a retrofit with space and existing infrastructure constraints. The devices range from catch basin inserts to complex underground hydrodynamic separators. They may use both physical and chemical means to remove pollutants. Some projects, such as the San Diego International Airport retrofit, below, are require...... continue reading
From: Stormwater Topics: BMP Manufactured, BMP Post Construction, Pollutants
By Gary R. Minton Vegetated roofs are filters that treat pollutants in precipitation and are of two general types: green roofs (Figure 1) and ecoroofs (Figure 2), a name less commonly used. Each consists of a building roof that is partially or completely covered with vegetation. The species are selected optimally for the particular environment, and a thin substrate is placed over a waterproof membrane. The structure includes a root barrier and a drainage system (Figure 3). Vegetated roofs serve several ...... continue reading
From: Stormwater Topics: BMP Post Construction, Low-impact Development, Research
By Janice Kaspersen It’s one of the better-known green infrastructure techniques, but not all of us recognize it when we see it: Permeable pavement looks, to the untrained eye, much like the regular kind. It’s been around in various forms for decades (the category includes not only porous or permeable asphalt, but also porous concrete, interlocking concrete blocks, geocells, and other forms). During that time, many beliefs, some of them incorrect, have sprung up about how and where it can and cannot be ...... continue reading
From: Stormwater Topics: BMP Post Construction, Low-impact Development, Research
By Don Talend San Angelo, TX, home of the Concho River that flows through the downtown area and three lakes, is a lot like many cities that sprang up along the banks of a river. Stormwater runoff affects the viability of drinking water and the ecosystem not only of San Angelo, but also of several communities located downstream. The Texas Commission on Environmental Quality (TCEQ) lists the North Concho River on its 2010 303(d) list for a water-quality impairment and cites water-quality concerns for high...... continue reading
From: Stormwater Topics: BMP Post Construction, Pollutants, Program Management
By Janet Aird “The use of permeable pavers has gone rampant,” says David Hein, an engineer with Applied Research Associates in Toronto, Canada. “It’s driven by the stormwater people. There’s been a major effort to deal with stormwater at the source.” While the goal of poured concrete and asphalt is to guide water away from their surface, the goal of the permeable paver system is to allow it to infiltrate into the ground below. And although they’re used most frequently for parking lots and driveways, the...... continue reading
From: Stormwater Topics: BMP Manufactured, BMP Post Construction, Low-impact Development
|
|