All surface water (lake, stream, wetland) in Pennsylvania is assigned a list of uses. The ability to support aquatic life is on the list for all of the surface water bodies of our state. |
How do we determine whether a given water body is adequate to support a specific use?For each use, a list of measurable standards has been developed. Lets look at one of the aquatic life uses, Trout Stocked Fishery, and examine the standards for this use. |
Trout Stocked FisheryA few too many big words here. |
What would we measure to determine whether a stream meets the requirements of a Trout Stock Fishery, that is, what specific standards must be met?pH6.0-9.0 inclusiveDissolved OxygenFor period February 15 to July 31 of any year, minimum daily average of 6.0 mg/l; minimum 5.0 mg/l. For remainder of year, minimum daily average of 5.0 mg/l; minimum 4.0 mg/lTotal Residual ChlorineFour-day average 0.011 mg/l; 1 hr average 0.019 mg/lTotal Dissolved Solids500 mg/l as a monthly average value; maximum 750 mg/lTotal AlkalinityMinimum 20 mg/l as CaCO3, except where natural conditions are less. Where discharges are to waters with 20 mg/l or less alkalinity, the discharge should not further reduce the alkalinity of the receiving stream.TemperatureTable below lists very specific temperature requirements over course of the year. Water temperature should not exceed Max Temp at any time during given period. |
PERIOD | Max TEMP (oF) |
---|---|
January 1-31 | 40 |
February 1-29 | 40 |
March 1-31 | 46 |
April 1-15 | 52 |
April 16-30 | 58 |
May 1-15 | 64 |
May 16-31 | 68 |
June 1-15 | 70 |
June 16-30 | 72 |
July 1-31 | 74 |
August 1-15 | 80 |
August 16-30 | 87 |
September 1-15 | 84 |
September 16-30 | 78 |
October 1-15 | 72 |
October 16-31 | 66 |
November 1-15 | 58 |
November 16-30 | 50 |
December 1-31 | 42 |
What can cause a water body to not be able to meet these standards, that is, what types of pollutants can degrade a stream so that it is not suitable for Trout Stocking? |