Transcript Stomrwater Treatment - University of Georgia

STORMWATER
TREATMENT
USING BEST MANAGEMENT PRACTICES
Land Uses and Water Quality
Courtesy of Oklahoma Farm Bureau
Courtesy of The VanNatta Forestry and Logging
Courtesy of BC Ministry of Forests and Range
stream quality
impacted
good
sensitive
Imperviousness affects
stream quality
degraded
fair
seriously degraded
poor
10%
25%
60%
percent imperviousness in the watershed
Credit: Center for Watershed Protection
Urbanization Impacts to Water
Quantity and Quality
Stream Corridor
Restoration:
Principles,
Processes, and
Practices, 10/98, by
the Federal
Interagency Stream
Restoration Working
Group (FISRWG)
Reformulated
Impervious Cover Model
Schueler, T. R., L. Fraley-McNeal, et al. (2009). "Is Impervious Cover Still
Important? Review of Recent Research." Journal of Hydrologic Engineering
14(4): 309-315.
Quadratic regression
analysis indicated a highly
correlated response
between increasing
imperviousness and
degraded water quality
(r2=.74, p<.0001) using the
following model:
Regression
(FBI)ln =-5.45067
+(0.17317*CN)+
(-0.00101*(CN^2))
Where:
FBI=Family Benthic
Index; CN=Curve Number
Stormwater Runoff Picks Up:
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Excess fertilizers
Oil and grease
Litter
Sediment
Salt
Bacteria
Nutrients
Phosphorous
Pesticides
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Atmospheric deposition
Herbicides
Insecticides
Nitrogen
Total suspended solids
Heavy metals
Pathogens
Stormwater Runoff (nonpoint source)
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Picks up pollutants
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Often flows right into streams
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Increases flooding and erosion
Different Approaches are Beneficial
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Treat water at the source
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Mindset shift
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More sustainable
approach
Better wildlife habitat
Photo: American Concrete Industries
Best Management Practices (BMPs):
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Rain Gardens
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Water Harvesting
(Cisterns/ Rain Barrels)
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Permeable Pavement
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Pocket Wetlands
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Swales
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Green Roofs
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Level Spreaders
BEST MANAGEMENT
PRACTICES
BMPs are structural or nonstructural
tools used to prevent or reduce the
amount of pollutants entering into a
waterbody through nonpoint
sources (NPS).
Methods to slow, treat, and
cool stormwater runoff
VEGETATED ROOF
PROMOTES TRANSPIRATION
POROUS PAVING
PROMOTES INFILTRATION
TRM: TURF REINFORCED
MATTING
CONVEYS RUNOFF AND FILTERS SOME POLLUTANTS
SUCH AS SEDIMENT
RAIN POCKET
TEMPORARY PONDING TO TREAT NUTRIENTS
ROUGH GRADING
ONE GROWING SEASON LATER
STORMWATER WETLAND
SLOWS RUNOFF AND TREATS POLLUTANTS SUCH AS
NUTRIENTS
CLEARING SITE
SHALLOW, LEAKY POND
FULL POOL, ALMOST
BIORETENTION
SLOWS RUNOFF AND TREATS POLLUTANTS SUCH AS
SEDIMENT
FLOOD IRRIGATION
STYLE BIORETENTION
SLOWS RUNOFF AND TREATS POLLUTANTS SUCH AS
SEDIMENT
TURF BIORETENTION