In the industrial module, the following calculations are made:

- splitting of quarterly billing data into monthly data
- calculation of monthly water use for the past situation (monitoring data available)
- calculation of growth of demand (relative)
- calculation of future monthly demand (absolute)
- calculation of wastewater return flows

Calculation of **past situation** (billing data available)

industrial water use (billed) from network |
+ |
unaccounted for water
= (unbilled water + losses) |
+ |
industrial water abstracted from own wells |
= |
industrial water use per settlement |

__Note__: Table QURT_BILLED_INDUSTRY
contains both network and billed data. However, some of the information
has been transferred from table MONTHLY_PRODUCTION (which means water
production from wells).

Calculation of **future situation**:

Net water demand for industries of a DC |
+ |
losses | = |
industrial water demand per DC |

Note: The unaccounted for water and losses are calculated within the Losses Module !

The calculation of the **development of industrial demand** uses the following formula:

IWn | = | (IWb * (1 + G/100)^{N} + S) * C |

with |
||

IWn | = | projected future industrial water demand in m³/month |

IWb | = | industrial water demand in m³/month in for previous time step |

G | = | assumed yearly industry water Growth rate in %for selected industry and scenario |

100 | = | factor to convert from percentage to fraction |

N | = | Time step in years N = (2005 - reference year); for the next steps: N = 5 ( 2010, 2015 etc.) |

S | = | Sudden increase/decrease in m³/month. Different values for supply from network or supply from own wells can be used! |

C | = | Capacity in % of total operating capacity of the facility |

The general concept of growth rate and migration is again applied.

**Wastewater generated** from industries is calculated as follows:

IWw | = | R * IWn / 100 |

with |
||

IWw | = | wastewater generated from industries |

R | = | Return factor = % of water use discharged as wastewater (one figure for each scenario). |

100 | = | factor to convert from percentage to fraction |