ILSAX
Supplementary areas
This is the term given in the Horton (ILSAX) hydrological model to impervious areas that are not directly connected to the pipe system. It includes areas such as tennis courts and concrete paths that are surrounded by pervious (grassed) surfaces, so ...
Horton (ILSAX) Sub-catchment property sheet
This is used to enter data for the Horton (ILSAX) hydrological model, the standard model applied in DRAINS before the ARR 2019 IL-CL model was introduced. A slightly different sheet is used for the rational method, and other formats are used for ...
Soil type
Soil types used in the Horton (ILSAX) hydrological model in DRAINS follow the U.S. Soil Conservation Service system adopted in the ILLUDAS model from which ILSAX was developed. There are four soil types involving different infiltration ...
Rational Method Model property sheet
This window, accessed from Project → Hydrological Models → Add Rational Method Model, enables you to enter, view or edit a rainfall-runoff model using the rational method. Three types of rational method model are available, and the inputs required ...
Paved areas
In general, this refers to land surfaces that are covered with impervious materials such as asphalt or concrete (although it may sometimes be applied to semi-pervious surfaces covered by paving blocks). In DRAINS it is the term given (for ...
Horton (ILSAX) hydrological model
The Horton (ILSAX) loss and routing models were taken from the programs from which ILSAX was developed, particularly ILLUDAS and ILLUDAS-SA. All use a loss model involving depression storages and the Horton infiltration model for pervious areas, and ...
Horton (ILSAX) Hydrological Model property sheet
This window enables you to enter, view or edit rainfall-runoff models. The data involved are: the name of the model (e.g. Manly Beach Model), depression storages (mm) for paved, supplementary and grassed areas, a soil type for the grassed or pervious ...
Grassed areas
This is the name given in the Horton (ILSAX) hydrological model within DRAINS to pervious areas, whether on not they are covered with grass. They might be lawns, bare soil, bushland, gardens, landscaped areas or even pervious pavements. The Horton ...
Depression storage
This is a depth of rainfall (mm) that is assumed to be retained in depressions or puddles on a catchment surface and evaporated. It is a kind of initial loss, but it may be assumed to occur after infiltration, so that in the Horton (ILSAX) ...