Plumbing Formula

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Before reading this article, ensure you have read Measurement - Parts & Labour and Using Formula within Groundplan articles to aid in understanding the following Formula examples.

📝 The Formula values provided in this article are for example purposes only.

Term	Explained
`count`	total counts
`len`	total metres measured
`count or len / x`	total count/length divided by an `amount`
*`count or len x`**	total count/length multiplied by an `amount`
`ceil(x)`	rounding up a decimal value to the next whole number

Downpipe

Example Parts for a downpipe Count Measurement:

Part	Explanation	Formula	UMO
100mm DVW pipe (6m)	How many `6m lengths` are required to complete downpipes when 3 metres `1/2 length (3m)` is needed for each downpipe	*`count0.5`**	lengths
100mm PVC 90° bend	How many `90° bends` are required when `3` are needed for each downpipe	*`count3`**	each
100mm saddle clip	How many `saddle clips` are required when `3` are needed for each downpipe	*`count3`**	each
100mm classic expansion outlet	How many `expansion outles` are required for each downpipe	`count`	each
Downpipe nozzle	How many `nozzles` are required for each downpipe	`count`	each
(optional) 100mm junction (for 80%)	How many junctions required for `80% of the downpipes` needed	*`ceil(count0.80)`**	each

Example Parts for a 100mm DWV average 1.5m depth Length Measurement:

Part	Explanation	Formula	UMO
100mm DWV	How many `6m lengths` required for the total length measured	`ceil(len/6)`	lengths
Trench work (1.5m average depth)	How many `m3` for the total length measured `multiplied by the 600mm wide by 1.5m deep`	*`len0.61.5`*	m3
Crushed rock (400mm average depth)	How many `m3` for the total length measured `multiplied by the 600mm wide by 400mm deep`	*`len0.60.4`*	m3

Example Parts for a sewer bend Count Measurement:

Part	Explanation	Formula	UMO
100mm 45° bend	Require `2x` 45° bends for each 90° count	*`count2`**	each
100mm DWV	Allowing an additional `600mm` of 100mm DWV for each upwards pipe (Grouping with Sewer Measurement) divided by `6m lengths` required for the total length measured	*`ceil(len0.6/6)`**	lengths

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