ENST 471 ppt8

ENST 471 ppt8 - Stormwater hydrology and tidal creeks of...

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Stormwater, hydrology, and tidal creeks of the New River Estuary Curt Stumpf Graduate Student UNC-IMS
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Outline Introduction Stormwater Hydrology Remediation and Prevention New River /Camp Lejeune
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Regulations •C W A - – Waters designated as appropriate for intended uses – NC General Assembly dictates stormwater regulations – NCDEHNR in charge of enforcement • NPDES- permits point source discharges – Phase I: Municipalities > 100,000 people permit to discharge stormwater – Phase II: Municipalities <100,000 people under certain cond. • Coastal Counties, Outstanding Resource Waters (ORW), and HQW
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Impacts of Stormwater Runoff What is it? • Captured stormwater • Direct runoff • Untreated
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A “Point” of Confusion: Point Source vs. Nonpoint Source • POINT source – Travels through a conveyance system – Regulated under permit program • NONPOINT source – Runoff that is not a point source – Addressed through voluntary programs
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Contaminant Loading CONTAMINANTS • Sediment •N u t r i e n t s • Metals • Hydrocarbons •B a c t e r i a • Herbicides/Pesticides IMPACTS: • Increased toxicity • Sediment smothering • Algal blooms • Pathogens • Aesthetics- odor, appearance, usability
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Illicit Discharges EPA NPDES website
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Science behind stormwater Copper from brake pads of cars Runoff from roadways near rivers and estuaries Pacific Salmon: exposures (0-20 ug/L for 3 h) on the olfactory system of juvenile coho salmon ( O. kisutch ) The sensory physiology and predator avoidance behaviors of juvenile coho were both significantly impaired by copper at concentrations as low as 2 í g/L. Sandahl et al 2007
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Biological Integrity and Habitat Kleindl 1995, May 1996, Morley 2000
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Mallin et al 2001
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Fish Kills • Nutrient influx Æ algal bloom Æ die off and oxygen consumption •L o w e r D O
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Increased Toxics • Heavy metals • Hydrocarbons • Pest and herbicides Herald 1999
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Stormwater runoff factors Rainfall Intensity Duration Antecedent rainfall Groundwater
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Groundwater • Effects on saturation • Runoff effects • Aquifer drawdown • Near coastal zones- ground retains freshwater • Runoff from impermeable to brackish water = loss of freshwater US Geological Survey
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Hydrology Of or dealing with the properties, distribution, and circulation of water on and below the earth's surface
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This note was uploaded on 01/03/2009 for the course ENST 471 taught by Professor Noble,rachael during the Spring '08 term at UNC.

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ENST 471 ppt8 - Stormwater hydrology and tidal creeks of...

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