Option

Description

Inlet Invert level

Elevation of the bottom of the storage unit.

Max Depth

Maximum depth of the storage unit.

Initial Depth

Initial depth of water in the storage unit at the start of the simulation.

Ponded Area

Surface area occupied by ponded water atop the storage unit once the water depth exceeds the maximum depth. If the Allow Ponding analysis option is turned on, a non-zero value of this parameter will allow ponded water to be stored and subsequently returned to the drainage system when capacity exists.

Evaporation Factor

The fraction of the potential evaporation from the storage unit's water surface that is actually realised.

Shape Curve

Method of describing the geometric shape of the storage unit. There are two options:

• FUNCTIONAL shape uses the following function to describe how surface area varies with depth: Area = A*(Depth)B + C

• TABULAR shape uses a tabulated area versus depth curve. In either case, depth is measured in metres (or feet) and surface area in sq. meters (or sq. feet).

Functional Curve

Coefficient

A-value in the functional relationship between surface area and storage depth.

Exponent

B-value in the functional relationship between surface area and storage depth.

Constant

C-value in the functional relationship between surface area and storage depth.

Tabular Storage Curve

Curve Name

Name of the Storage Curve containing the relationship between surface area and storage depth. Click ... to edit the selected storage curve.

Green Ampt Infiltration Method

Suction Head

Average value of soil capillary suction along the wetting front.

Conductivity

Soil saturated hydraulic conductivity.

Initial Deficit

Fraction of soil volume that is initially dry.