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Baltimore LTER Nutrient and Bacterial Fluxes in Urban Watersheds of the Gwynns Falls, Baltimore, MD.   Belt, K. T.1, P. M. Groffman2, L. Band3, N. Law3,

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Presentation on theme: "Baltimore LTER Nutrient and Bacterial Fluxes in Urban Watersheds of the Gwynns Falls, Baltimore, MD.   Belt, K. T.1, P. M. Groffman2, L. Band3, N. Law3,"— Presentation transcript:

1 Baltimore LTER Nutrient and Bacterial Fluxes in Urban Watersheds of the Gwynns Falls, Baltimore, MD. Belt, K. T.1, P. M. Groffman2, L. Band3, N. Law3, and G. T. Fisher4. 1 US Forest Service/Baltimore Ecosystem Study, 2 Institute of Ecosystem Studies, 3 University of North Carolina, 4 US Geological Survey

2 Urban Land Use Change

3 Stream Temperatures…Base & Stormflow

4 Suburban vs. Forested Watersheds

5 The Urban Hydrograph Urban Forested

6 Stream Storm Drain Outfall & Gage Storm Drain Conduits
42” 36” Storm Drain Conduits 18” 36” 18” Drainage Boundary Storm Drain Conduit Manhole Access Inlet & Catchbasin

7 Channel Incision I. Natural Channel with Connected Riparian Zone
Stream Water Table II. Channel with Incision Due to Increased Runoff Channel Erosion Nonfunctional Floodplain Dry Riparian Soils

8 Gravity Sewers… Interwoven with Fluvial Systems
Main Line Interceptor Feeder Lines

9 Sewer Leakage Paths to Streams
Feeder Line Stream Main Sewer Interceptor Pipeline

10 Civil infrastructure becomes part of the stream system
The Urban Hydrologic System Civil infrastructure becomes part of the stream system Artificial Channels Stormdrains Water Supply Impervious Surface Septic Systems Groundwater Stream Wastewater

11 McDonogh Weir Rognel Hts Storm Sewer Carroll Park Main Channel

12 Urban Watersheds with More Baseflow?

13 Nitrate In the Urban-Rural Gradient
2 3 1

14 Urban…Greater Annual Runoff

15 Annual Nitrate Yields

16 Annual Phosphate Yields

17 A Little Leakage…Goes a Long Way

18 Restoration Objectives…Multiple Choices

19 Pathogens in Urban Watersheds
Fecal Coliforms are used as indicators of sewage contamination…but

20 Disproportionate Impacts…Public Health Issues ?

21 Glyndon: 80 % of Nitrogen is Missing…
Where did it go? Input: Fertilizer, 21.5 23.5 Input: Atmospheric Deposition ? 8.5 Monitoring Station Output: Measured Loads in the Stream 6.5 Kg/ha/yr

22 Researchers Lawrence Band Ken Belt Mark Colosimo Peter Groffman Neely Law Gary Fisher Institutions IES Forest Service Johns Hopkins UNC NRCS USGS Students/Techs Alex Kalejs Jessica Hopkins Nate Forand Evan Grant Alan Lorefice Steve Kenworthy Alysia Perry Emilie Stander Amanda Thimmayya Ian Yesilonis

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