InfoDrainage 2021.2 Help Documentation infodrainage2021v2

Foul Runoff can only be defined in Foul phases.  

Calculations

The resulting flow from the foul runoff is made up of three parts: Industrial flow runoff from the catchment area, Domestic flow runoff from the catchment area, and Foul flow from dwellings.

Resulting Flow =  Industrial flow rate + Domestic flow rate + flow rate from either Discharge Unit or Main Drainage.

The flow from the industrial portion of the development is calculated by:

Industrial flow rate = Catchment Area x Industrial Peak Flow Factor x Industrial Flow

The flow from the domestic portion of the development is calculated by:

Domestic flow rate = Catchment Area x Domestic Peak Flow Factor x Domestic Flow

Foul flow from dwellings can be calculated using either the Discharge Unit method or the Main Drainage method.

Discharge Unit foul flow calculation:

Foul flow rate =  SQRT( Total Discharge Units) * Frequency Factor

Main Drainage foul flow calculation:

Foul flow rate = (Flow Per Dwelling * Number of Dwellings) / 86400

Industrial Flow (checkbox) - Check to include industrial flow.

Industrial Flow (textbox) - The amount of industrial flow per unit area.

Industrial Peak Flow Factor - A factor to apply to the industrial flow to account for the peak flow.

Domestic Flow (checkbox) - Check to include domestic flow.

Domestic Flow (textbox) - The amount of domestic flow per unit area.

Domestic Peak Flow Factor - A factor to apply to the domestic flow to account for the peak flow.

Calculation Method  - The method used to calculate flow. Available options are Discharge Unit and Main Drainage.

Discharge Unit

Total Discharge Units - The total of all discharge units. Editable manually or via the Total Discharge Units Calculator.

Frequency Factor - Factor applied in calculating flow.

Main Discharge

Flow per Dwelling - The total flow for a single dwelling. Editable manually or via the Flow per Dwelling Calculator.

Number of Dwellings - The total number of dwellings.

Resulting Flow Rate - The total flow calculated.