The optimum gutter location and fixing trajectory are also explored to produce recommendations.
Width to depth gutter ratio.
Compute depth of flow and ponded width t in the gutter section at the inlet.
Tweak the gutter relation to height to obtain different gutter sizes.
Plan width and plan length should be flat plan dimensions not calculated along the slope.
As with gutters a downspout s capacity must match or exceed the expected runoff.
Maximum gutter per ds refers to the maximum length of gutter that is to be served by one downspout.
Wp56 the optimum sizing of gutters for domestic roofwater harvesting.
The width depth w d ratio is defined as the ratio of the bankfull surface width to the mean depth of the bankfull channel.
Capacities calculated using manning s formula for open channel flow.
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.
Starting with the length of the gutter l follow a vertical line until the ratio m is reached.
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 above recommendations assume that you have properly sized downspouts every 40 feet.
The slope will take input as either an integer e g.
To do this a ratio m which equals the depth divided by the width is initially assumed.
A depth width ratio of 0 75 the required gutter width is 5 1 inches.
The required gutter width can be read from the diagonal lines.
Iii a u shaped or trapezoidal section gutter of width only 70 mm will be sufficient for most house roofs in the tropics.
Of the level ii criteria the w d ratio is the most sensitive and positive indicator of trends in channel instability.
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.
Depth of gutter 0 75 x width.
Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run.
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.
Ratio of depth to width of gutter select gutter ratio 0 125x 0 25x 0 375x 0 5x 0 625x 0 75x 0 875x 1x 1 125x 1 25x 1 375x 1 5x 1 625x 1 75x 1 875x 2x calculate drainage reset.
At this point follow a horizontal line to the left until the vertical line of rainfall intensity x design area ia is crossed.
Capacities calculated using manning s formula for open channel flow.
3 or a ratio to 12 e g.
The standard is about inch per 10 feet.
