The following example greenhouse, which will be referred to throughout the book, is 96 ft. x 192 ft., with a ground area of 18,432 ft2. Each gable roof
spans 24 ft., so each gutter serves a ground area of 4,608 ft2. Using the rule above, the downspouts should have a cross sectional area of 23 in.2 (a
circular section with a 5.5-in. diameter) if located at each end. The gutter should be a semi-circle with a 7-in. diameter or any other shape with a cross
sectional area of 19 in.2.
The following example greenhouse, which will be referred to throughout the book, is 96 ft. x 192 ft., with a ground area of 18,432 ft2. Each gable roofspans 24 ft., so each gutter serves a ground area of 4,608 ft2. Using the rule above, the downspouts should have a cross sectional area of 23 in.2 (acircular section with a 5.5-in. diameter) if located at each end. The gutter should be a semi-circle with a 7-in. diameter or any other shape with a crosssectional area of 19 in.2.
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