- 19 Sep 2023
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# Plumbing Formula

- Updated on 19 Sep 2023
- 2 Minutes to read

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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 are required to complete downpipes when 3 metres `6m lengths` is needed for each downpipe`1/2 length (3m)` | `count*0.5` | lengths |

100mm PVC 90° bend | How many are required when `90° bends` are needed for each downpipe`3` | `count*3` | each |

100mm saddle clip | How many are required when `saddle clips` are needed for each downpipe`3` | `count*3` | each |

100mm classic expansion outlet | How many are required for each downpipe`expansion outles` | `count` | each |

Downpipe nozzle | How many are required for each downpipe`nozzles` | `count` | each |

(optional) 100mm junction (for 80%) | How many junctions required for needed`80% of the downpipes` | `ceil(count*0.80)` | each |

## 100mm DWV Sewer (av. 1.5m depth)

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

Part | Explanation | Formula | UMO |
---|---|---|---|

100mm DWV | How many required for the total length measured`6m lengths` | `ceil(len/6)` | lengths |

Trench work (1.5m average depth) | How many for the total length measured `m3` `multiplied by the 600mm wide by 1.5m deep` | `len*0.6*1.5` | m3 |

Crushed rock (400mm average depth) | How many for the total length measured `m3` `multiplied by the 600mm wide by 400mm deep` | `len*0.6*0.4` | m3 |

## Sewer Bend

Example Parts for a sewer bend Count Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

100mm 45° bend | Require 45° bends for each 90° count`2x` | `count*2` | each |

100mm DWV | Allowing an additional of 100mm DWV for each upwards pipe (Grouping with Sewer Measurement) divided by `600mm` required for the total length measured`6m lengths` | `ceil(len*0.6/6)` | lengths |

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