The capacity of a sloped rectangular gutter may be approximated by using a gutter cross section area not less than that of a semicircular gutter and a depth to width ratio of at least 0 75.
Width to depth gutter ratio.
The width depth w d ratio is defined as the ratio of the bankfull surface width to the mean depth of the bankfull channel.
A depth width ratio of 0 75 the required gutter width is 5 1 inches.
Depth of gutter 0 75 x width.
The slope will take input as either an integer e g.
The above recommendations assume that you have properly sized downspouts every 40 feet.
As with gutters a downspout s capacity must match or exceed the expected runoff.
Plan width and plan length should be flat plan dimensions not calculated along the slope.
3 or a ratio to 12 e g.
At this point follow a horizontal line to the left until the vertical line of rainfall intensity x design area ia is crossed.
The optimum gutter location and fixing trajectory are also explored to produce recommendations.
Wp56 the optimum sizing of gutters for domestic roofwater harvesting.
Maximum gutter per ds refers to the maximum length of gutter that is to be served by one downspout.
To do this a ratio m which equals the depth divided by the width is initially assumed.
Q 1 486 x s 0 667 with n 0 012 for smooth metal smooth concrete or planed lumber and p wetted perimeter in feet.
Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run.
Capacities calculated using manning s formula for open channel flow.
Depth of gutter 0 75 x width.
The standard is about inch per 10 feet.
Compute depth of flow and ponded width t in the gutter section at the inlet.
The required gutter width can be read from the diagonal lines.
Capacities calculated using manning s formula for open channel flow.
Starting with the length of the gutter l follow a vertical line until the ratio m is reached.
Tweak the gutter relation to height to obtain different gutter sizes.
Of the level ii criteria the w d ratio is the most sensitive and positive indicator of trends in channel instability.
For a depth width ratio of 0 75 and a rectangular gutter width of 6 inches the depth should be 4 5 inches deep.
The width depth ratio is key to understanding the distribution of available energy within a channel and the ability of various discharges occurring within the channel to move sediment.
Determine the ratio of the width of flow in the depressed section w to the width of total gutter flow t using equation 10 5.
