Box Gutter Fall Calculator

Design area effective area 5 x 10 x 1 29 64 5m run off 64 5m x 0 022 l s per m 1 42 l s from chart 125 x 100 gutter with 76 ø downpipe appears suitable but check.

Box gutter fall calculator.

Lg 10 133 therefore reduction factor 0 86 d 0 1 gutter capacity x reduction factor 2 84 x 0 86 2 44 l s therefore the proposed system is suitable. Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter. Simplified suitable for flattish roofs with little or no vertical faces or steep roofs draining to one side of box gutter only or any roof if you are in a hurry and make the necessary allowances for all catchments. Measure the length of the string to determine the distance between the two points.

To calculate gutter slope attach one end of a long piece of string to the highest point of your gutter and the other end at the location of your downspout. Calculate the gutter slope by dividing the length of the gutter needed by 10. Enter the x in the conversion calculator to get degrees. Upon completion a full set of rainwater drainage design calculations are provided confirming the.

The numbers on the left hand side of the table show the flow rates when the gutter is fixed level no fall and the figures on the right detail the flow rate when the gutter is fixed to a fall of 1 in 350. Box gutter with rain water head at end of box gutter. Place the line spirit level on the string. For the conversion calculator enter in one box and the answer will appear in the relevant other.

If there is any doubt regarding the rainfall intensity for a particular area refer to the relevant council shire for accurate rainfall intensity figures. Degrees must be used for the roof slope box. Based on the location roof design and overflow types the calculator provides the allowable gutter types downpipe sizes and whether the selected overflow measures are adequate. It is a ms excel file and uses data contained in ncc volume two for the calculations.

If the length of the gutter is 10 5 metres 35 feet the amount of slope required is 1 25 cm 1 4 inch multiplied by 1 metres 3 5 feet which when rounded up is 2 5 cm 1 inch. I fall or slope box gutters to be installed with a minimum uniform fall of 1 in 200 towards the outlet. Use a string level to ensure the string is completely parallel to the ground. Take the plan length from ridge to gutter divide by the total fall this will give the x in terms of the roof slope being 1 in x.

The gutter flow rate chart below compares the specific flow rates for each floplast gutter system. The tools guide the user step by step allowing fast and simple roof drainage design whilst ensuring full compliance with bs en12056 3 rainwater drainage design standard. Internal gutters box gutters 100 years ari table e1 in as nzs 3500 3 lists latitude and longitude of selected places some of which are marked on the maps. This calculator has been created and designed for excel 2013 for windows.