Upper Outlet Data

Includes data on a orifice type outlet if required. Allows up to 2 slots in a single tower structure. Orifice type outlets presently are NOT tied to downstream interconnected basins.

Two tiered orifices are designed in two passes.

Level/discharge is defined by co-ordinates only.

The first run, often for say a 5yr storm, allows you to define the final width of the bottom orifice (PDIA) the pipe diameter variable used as a width factor and the max water level reached.

This allows the user to input the bottom width factor and the sill level for the second orifice equal to max water level. The second run, often for a 100yr storm, will then allow the user to size the upper orifice by varying PDIA while holding the lower slot dimensions.

Both orifices are assumed equal height.

Upper Outlet Invert

Level of upper outlet invert. This level is used in conjunction with two stage orifice optimisation for designing outlets for two return periods. The level should ONLY be set on the second run, equal to the maximum water level during the first run.

Discharge Factor

This factor is a multiplier to the normal outlet level-discharge relation, defining a new level-discharge relation for an upper outlet.

When designing a two level outlet, this value and the upper outlet invert are frozen on the second run.

Width Factors

Includes data on a orifice type outlet if required. Allows up to 2 slots in a single tower structure. Orifice type outlets presently are NOT tied to downstream interconnected basins. Two tiered orifices are designed in two passes.

Level/discharge is defined by co-ordinates only. The first run, often for say a 5yr storm, allows you to define the final width of the bottom orifice (PDIA) the pipe diameter variable used as a width factor and the max water level reached.

This allows the user to input the bottom width factor and the sill level for the second orifice equal to max water level. The second run, often for a 100yr storm, will then allow the user to size the upper orifice by varying PDIA while holding the lower slot dimensions. Both orifices are assumed equal height.