Box Gutter Fall Calculator

Proper gutter and downspout sizing rainfall intensity downspout capacity rainfall intensity is usually given in inches per hour for a five minute duration or one hour duration based on u s.

Box gutter fall calculator. For the conversion calculator enter in one box and the answer will appear in the relevant other. The other box gutter programs on this site calculate which is the worst rain direction by allowing shadowing effects from all the vertical faces. New orleans los angeles for example. Upon completion a full set of rainwater drainage design calculations are provided confirming the.

Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. 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. For more information on rain shadow effects refer to box gutter with vertical faces also this calculation is only suitable when the box gutter drains to a rainwater head with overflow at the end. Wood gutters run about 18 28 per ft and copper gutters can cost 20 plus per ft.

Our online tools have been designed with simplicity in mind removing the need for any prior specialist industry knowledge. To limit the effects of thermal expansion in gutters 50 ft. Most professional gutter installers are equipped with a box truck that can spit out 48 ft. Downspout sizes must not exceed the bottom width of the gutter.

Degrees must be used for the roof slope box. 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. 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. Enter the x in the conversion calculator to get degrees.

Table 1 2 based on records through 1978 gives five minute intensities for selected cities. 15 m is a practical maximum gutter length to be served by a downspout.