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24 Cards in this Set
- Front
- Back
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What is the formula to calculate the number of gallons of water in a pond? |
Volume in cubic feet x 7.48 |
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For an outdoor pond with fish, at what temperature should feeding stop? |
50° -55°F 10°c |
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Where in a yard should a water feature be situated? |
Where they will receive as much sun as possible |
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Why can't Pvc plastic used in roofing be installed as a pond liner? |
Its treated with chemicals which can harm fish and water plants |
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How deep should a pond be if you want to overwinter fish? |
1.5 meters 3' + |
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3 different types of plants used for ponds |
Oxygenators Floating plants Marginal plants |
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Oxygenators |
Compete with algae for nutrients which keeps the water pure and clear Ex. Hornwort |
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Floating plants |
Help keep the pond clear of algae by shading the water and using nutrients. |
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How much of a pond should be covered by floaters and water lilies? |
60% |
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Marginal plants |
Perennial marshland plants that are planted around the edge of ponds Ex. Cattails, water iris |
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How much water can a pond lose per day to evaporation? |
1/4"-1/2" .5-1.0cm |
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Evapotranspiration |
The combination of water transpired from plants and water evaporated from the plant surface |
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When using concrete for pond containment what is it often combined with? |
A liner to prevent leakage if concrete cracks |
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How can concrete effect a pond? |
Can raise the pH of the water |
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What is a general rule when picking a pump size for a pond ? |
Pump should be able to circulate the total water volume in at least 1 hour |
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Two types of pumps used in ponds |
Submersible often used in residential Centrifugal often used in commercial sites |
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Which has more pumping capacity, submersible pumps or centrifugal? |
Centrifugal |
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2 types of filters used in ponds |
Mechanical Biological |
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These filters traps materials such as dead organic matter, fish food, and waste |
Mechanical |
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These filters promote growth of beneficial bacteria |
Biological |
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Why can runoff entering a pond be a concern? |
Runoff can carry fertilizer and organic matter and promote algae growth |
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Why is circulation important for fish and plants? |
Keeps oxygen levels high |
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Why are aquatic plants beneficial for a pond? |
They deprive algae of its food source |
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Optimal pH for a pond |
6.5-7 pH |
