Reservoirs must be properly maintained to ensure the best possible water quality. Treatment of reservoirs may harm fish, and care should be taken.
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| Poorly maintained reservoir |
These procedures are based on our experience with reservoirs since 1968 and are our recommendations. They should be used as a guide only. Please remember to take all necessary precautions when using chemicals.
Aeration
Dugout aeration will tend to inhibit algae growth, and will lessen the odour problems associated with anaerobic decomposition.
Taste, Odor, Color
The foul taste, odour and colour in reservoir water usually results from algae or water plants. Decomposing algae and plants on the bottom of the water produce hydrogen sulfide gas, which gives the water a "rotten-egg" taste and odour. By the end of winter, water may become black. Control of algae and plants during the spring and summer will reduce these problems.
Controlling Aquatic Vegetation
All preventative and mechanical methods should be considered prior to chemical treatment.
Preventative Methods
Deeper dugouts with steeper slopes reduce the shallow areas where plants grow rapidly. Limit nutrients:
Aeration
Dugout aeration will tend to inhibit algae growth, and will lessen the odour problems associated with anaerobic decomposition.
Taste, Odor, Color
The foul taste, odour and colour in reservoir water usually results from algae or water plants. Decomposing algae and plants on the bottom of the water produce hydrogen sulfide gas, which gives the water a "rotten-egg" taste and odour. By the end of winter, water may become black. Control of algae and plants during the spring and summer will reduce these problems.
Controlling Aquatic Vegetation
All preventative and mechanical methods should be considered prior to chemical treatment.
Preventative Methods
Deeper dugouts with steeper slopes reduce the shallow areas where plants grow rapidly. Limit nutrients:
- Flood diversion dikes with gated culvert inlet.
- Grass the water course and the area around the dugout.
- KEEP LIVESTOCK OUT!
Mechanical Methods
- Hand pull plants
- drag a heavy chain or harrows across the bottom to cut plants
Polydex
Polydex is a mineral based bacteriostatic algaecide liquid concentrate that can:- Reduce algae, bacteria and associated toxins
- Improve colour, taste and smell in the water
- Reduce suspended solids
- Reduce organic film build up in lines
Copper Sulphate (Bluestone)
Copper sulphate can be an effective treatment for algae. It is more effective if used before the algae population becomes heavy. To apply, it may be placed in a burlap sack and dragged around the reservoir, or the water filling the
reservoir may run over the sack. The dosage is 1 to 2 pounds per 100,000
gallons.
Copper sulphate can be an effective treatment for algae. It is more effective if used before the algae population becomes heavy. To apply, it may be placed in a burlap sack and dragged around the reservoir, or the water filling the
reservoir may run over the sack. The dosage is 1 to 2 pounds per 100,000
gallons.
If heavy blooms of blue-green algae develop, use caution. Another source of
water should be used for 2 weeks after treatment. Copper sulphate is toxic to fish. If you must treat a dugout containing fish, treat 1/3 at a time and space the treatments 24 hours apart. Water usage should be avoided for 24 hours.
Turbidity
Reservoirs that become turbid (muddy) will usually clear by themselves. Be
careful not to confuse colour caused by decaying algae or organic matter with
turbidity, as treatment is different. If turbidity persists, Alum may be used. The alum should be dissolved in water 1/2 pound per gallon) and spread evenly over the surface. The dosage is 10 to 20 pound per 100,000 gallons.
Reglone A (Diquat)
This chemical is used to control aquatic plants. Treated water should not be used by humans or animals for 2 weeks. Contact your supplier for correct dosage.
Granular Chlorine
More effective than Copper Sulphate for organic matter and algae is granular
chlorine. It may be simply broadcast over the surface. The dosage is 4# per 100,000 gallons. In severe cases, it may be necessary to repeat treatment in a week.
water should be used for 2 weeks after treatment. Copper sulphate is toxic to fish. If you must treat a dugout containing fish, treat 1/3 at a time and space the treatments 24 hours apart. Water usage should be avoided for 24 hours.
Turbidity
Reservoirs that become turbid (muddy) will usually clear by themselves. Be
careful not to confuse colour caused by decaying algae or organic matter with
turbidity, as treatment is different. If turbidity persists, Alum may be used. The alum should be dissolved in water 1/2 pound per gallon) and spread evenly over the surface. The dosage is 10 to 20 pound per 100,000 gallons.
Reglone A (Diquat)
This chemical is used to control aquatic plants. Treated water should not be used by humans or animals for 2 weeks. Contact your supplier for correct dosage.
Granular Chlorine
More effective than Copper Sulphate for organic matter and algae is granular
chlorine. It may be simply broadcast over the surface. The dosage is 4# per 100,000 gallons. In severe cases, it may be necessary to repeat treatment in a week.
Copper sulphate treatment may be
applied at the same time for enhanced
results.
Gravel Filters
Gravel filters installed in or beside the
dugout are not recommended.
Floating Intakes
During the summer, 80% of the impurities are close to the bottom. A floating intake, 3 feet from the surface willcollect the best water. During winter, lower the float to below the expected ice level.
During the summer, 80% of the impurities are close to the bottom. A floating intake, 3 feet from the surface willcollect the best water. During winter, lower the float to below the expected ice level.
Floats may be constructed by 16' of 1 1/2" pipe coupled in a ring, or 3' of 3" PVC or ABS pipe capped at each end.
Blue Green Algae
Blue—Green Algae can be toxic. Please follow this link to Alberta Environment
information:
http://www.environment.alberta.ca/documents/Blue-green_algal_FS.pdf
Blue Green Algae
Blue—Green Algae can be toxic. Please follow this link to Alberta Environment
information:
http://www.environment.alberta.ca/documents/Blue-green_algal_FS.pdf
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