"MADE IN THE USA" by "American workers"!
panels can capture in excess of 22 inches of rain per hour
on an average roof; this is about double the record rainfall in the USA.
model used for demonstrations at shows produces a flow of 300 gallons per hour
over 18". This means that the
panel is capturing water and delivering it into the rain gutter at a flow
of 16.8 gallons per hour per inch of gutter. In the example below of an average
house, d = 180"; rain would have to fall at the rate of 21.4 inches in an
hour to produce this flow.
inches of rain per hour and
gallons per inch per hour.
We need to know
the horizontal distance from the eaves to the crown of the roof. For a typical
house this will be half the width of the house. It is labeled d in
the diagram. For the calculations below we should measure d in inches.
If x inches of rain fall, xd cubic inches will flow across an
inch of gutter, on average. There are 231 cubic inches in one gallon. So if x inches
of rain fall per hour there will be a flow of xd/231 gallons per hour
across an inch of gutter. For example: If d is 15'=180", and the rain
fall is 2" in an hour, then the flow over each inch of gutter will be 180
* 2/231=1.5 gallons per hour. Note that the demonstration model captures
16.8 gallons per hour which is more than the record rainfall we have ever had in the USA.