|
Home > Center for the Environment > Campus Ecology & Trails > Water Monitoring
Water Monitoring
Water Quality Data
Stony Brook Water Flow Data
View current data from the Stony Brook flow-meter located near the Cathouse.
MHC Lakes and Stony Brook Water Quality Monitoring [PH] Water Sampling Locations
(select 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 Morgan 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 period 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 to 20 mg/L
|
+/- 0.2mg/L |
0.01 to 1 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]
|
