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Water Monitoring

Water Quality Data

Stony Brook Water Flow Data

To view current data from the Stony Brook flow-meter located near the Cathouse --> click HERE...

MHC Lakes and Stony Brook
Water Quality Monitoring
[PH]

Water Sampling Locations
- click image for larger view-

Description of Sampling Locations

Site 1 -This point is located where Stony Brook enters the campus properties. It is on the upstream side of the culvert that passes under Morgan St. It is reached by climbing down the riprap on the eastern side of the culvert.

Site 2 - Located where the Upper Lake Hiking Trail crosses Stony Brook. A foot bridge spans the brook at this point. Samples are taken from the downstream side of the bridge.

Site 3 - This point is on the eastern side of Upper Lake dam. Samples are taken on the upstream side of the dam.

Site 4 - Samples are taken from the upstream side of the "Cat House" dam. The samples are drawn from the western side of the stream.

Site 5 - This point is immediately upstream from Lower Lake dam.

Site 6 - Located just below the Lower Lake dam, close to Mortgan Street. .

Site 7 - This point is on the small stream that flows from the Orchard's Golf course into Upper Lake. The point is near the outflow of the stream, but above the area where stream water might mix with lake water.

Site 8 (not shown)- This point is also on the stream that flows from the Orchard's Golf Course. It is farther upstream than Point #7. The point is immediately upstream from the junction where the stream passes under Silver St. (sampled per certain periond of time).

Sampling Intervals

Samples with the YSI probe are taken on a biweekly basis. We are currently sampling at all sites. As the weather becomes colder, and the lakes and streams freeze, many sampling points are no longer safely accessible.

Parameter Description Range Accuracy Resolution
Temperature Is measured using a temperature probe. -5 to 45 Celsius +/- 0.15 0.01
DO% Percent dissolved oxygen. Measures the saturation level of oxygen at the present water temperature. The sensor is a rapid pulse, Clark type polarographic type. 0 to 200% +/- 2% air saturation 0.1% air saturation
DOC Dissolved oxygen concentration is calculated from % air saturation, temperature and salinity. The sensor is a rapid pulse, Clark type polarographic type. 0 to 20 mg/L +/- 0.2 mg/L 0.01 mg/L NO3
Nitrate Is measured using an ion-selective probe. 0-200 mg/L +/- 10% 0.001 to 1 mg/L (Range dependent)
Ammonium Ammonium (Nitrogen) is measured with an ion-selective probe. 0-200 mg/L +/- 10% of reading 0.001 to 1 mg/L (Range dependent)
Conductivity Conductivity is measured using a 4 electrode cell with autoranging. 0 to 100 mS/cm +/- 5% of reading 0.001 to 0.1 mS/cm (Range dependent)
pH Acidity is measured using a glass combination electrode. 0 to 14 units +/- 0.2 units 0.01 units
Chlorophyll b An in situ fluorometer is used to detect chlorophyll levels. 0 to 400 ug/L 0.1 ug/L  
Turbidity        

The watershed based approach is the guiding principal of water quality management and regulation by state and federal agencies.

Credits:
Page designed, created and maintained by Leszek Bledzki
Peter Houlihan – text and pictures marked [PH]

 

Center for the Environment
Talcott Greenhouse South
50 College Street
Mount Holyoke College
South Hadley, MA 01075
Phone: 413-538-3091

Copyright © 2006 Mount Holyoke College. This page created and maintained by Center for the Environment. Last modified on April 16, 2006.