Describe two ways to drain roof water.

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Flat roofs and other such surfaces usually slope toward interior roof drains. The roof drains are raised cast iron, plastic, or aluminum strainers set in the center of a sloped area. Water drains through downpipes, which may be hidden internally or mounted on the exterior of a building. The downpipes connect to a storm drain below the building, which connects to the storm sewer outside the building. Another technique is to slope the roof toward scuppers, which provide outlets in the parapet wall and drain the surface water through them into downpipes and on to the storm sewer.

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List the different types of silicon manufactured for photovoltaic cells.

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When installing flared fittings, stop tightening the flaring screw when the flare reaches an angle of _____ degrees.

a. 35 b. 30 c. 45 d. 90

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School gardens are becoming

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Rainbow trout require excellent (meaning low) levels of dissolved oxygen

Indicate whether the statement is true or false.

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