Longitudinal sites along the Gwynns Falls

1. Boundary Station 1. Gwynns Falls at Glyndon. This site samples drainage from approximately 96 ha of suburban land at the headwaters of our main study stream.
2. Boundary Station 2. Gwynns Falls at Gwynnbrook/Delight. This site samples drainage from approximately 1,000 ha of old and new suburban and suburbanizing land use.
3. Boundary Station 3. Gwynns Falls at Villa Nova. This site samples drainage from approximately 7,400 ha of old and new suburban and suburbanizing land use. Streamflow at this station has been monitored continuously by the USGS since 1957 (with a hiatus from 1988 - 1995). This station is the boundary between the urban and suburban portions of the Gwynns Falls.
4. Boundary Station 4. Gwynns Falls at Route 1/Carroll Park. This sites samples drainage from approximately 16,000 ha of mixed suburban and urban watershed. The site has been monitored by USGS since 1994 and represents the boundary condition for entire Gwynns Falls above head of tidal influence. This station allows for evaluation of the urban portion of the Gwynns Falls watershed by comparison with the Gwynns Falls at Villa Nova station (station #3 above).

1. Small Watershed 1. Pond Branch. This is a completely forested "reference" 41 ha watershed located in a county park.
2. Small Watershed 2. McDonogh. This is an 8ha agricultural "reference" watershed located on the grounds of the McDonogh School.
3. Small Watershed 3. Dead Run. The site samples high density urban residential land use.
4. Small Watershed 4. Glyndon. Boundary station #1 (described above) also serves as a small watershed, draining approximately 96 ha of mixed rural and old suburban land use.
5. Small Watershed 5. Baisman Run at Ivy Hill Road. This is a 381 ha, 80% forested watershed with unsewered residential land use in the headwaters.
6. Small Watershed 6. Rognel Heights. This is a 7.8 ha urban watershed with no natural drainage network. Samples (weekly grab and flow-weighted composite) are taken in a stormwater drainage pipe.
7. Small Watershed 7. Maiden’s Choice. This is an urban watershed that is a target of efforts to improve sanitary sewer infrastructure in the City of Baltimore.
8. Small Watershed 8. Gwynns Run. This is an urban watershed that is a target of efforts to improve sanitary sewer infrastructure in the City of Baltimore.
9. Upper Gwynns Falls tributaries. From April 1999 to August 2000 Johns Hopkins University graduate student Mark Colosimo sampled a group of sites in the Upper Gwynns Falls (Red Run, Horsehead Branch, Scotts Level Branch, Holly Branch).
10. Cub Hill sites. The “Cub Hill” site is 14 km from the Baltimore city center (39°24'30.20"N, 76°30'50.62"W) and is the location of the first permanent urban carbon flux tower in an urban/suburban environment, established in 2001 by the U.S. Forest Service. Three long-term stream monitoring sites were established in the residential area in the footprint of the tower; Jennifer Branch at North Wind Rd. (JBNW) and two headwater tributaries to Jennifer Branch: Harford Hills (JBHH) and Ontario (JBON).
11. Watershed 263 subwatersheds. Watershed 263 is a 364 ha urban storm drain watershed (or sewershed), with 30,000 residents with mixed industrial, institutional, and residential land uses. In March 2004, we established long-term monitoring sites in two sub-watersheds within W283. Both are approximately 17 ha, with 20% impervious surface and 4% vegetation cover. Samples (weekly grab and flow-weighted composite) are taken in a stormwater drainage pipe.

Metadata:
Detailed information describing the methods, units, controls and other particulars of these data is available at the following two links: [ Streamflow Metadata ]   [ Stream Chemistry Metadata ].