Overflow Routes
Weirs as alternatives to overflow routes
The special weir object in DRAINS can be used as an alternative to an overflow route at sag pits when the hydraulic control is a parabolic weir. For example, if a user has access to the Full unsteady hydraulic model option in DRAINS, the overflow ...
Overland flowpaths (Overflow routes)
These are surface paths along which flows can occur. There are two types: paths followed by stormwater runoff from a catchment on its way to an inlet to a pipe or channel system, paths for bypasses and overflows from inlet pits, that may travel to ...
Overflow routes
These are surface paths along which overflows from pits travel. Commonly they will be along street gutters and designated flow paths, but they may run through properties and areas such as car parks. (Surface flows from sub-catchments draining to pits ...
Property sheet for overflow routes from pits
The appearance of this property sheet will vary depending on whether: you are operating the Full Unsteady hydraulic model, the storage network routing module is enabled, or you have started to specify extra data for the Full Unsteady hydraulic model. ...
Overflow route property sheet
This is used to define the hydraulic characteristics of the flow paths along which overflows from pits, headwalls and detention basins may flow. It takes different forms depending on the type of node from which the route comes, and on the options ...
Overflow route from a RAFTS storage routing node
When applying storage routing models, there are different types of stream routing reaches for the RORB and WBNM models. The RAFTS model uses the same overflow route as for pits for routing through links. Data must be provided on two pages. In the ...
Overflow route from a detention basin or headwall
For this situation, the Overflow Route property sheet must contain the required information for an overflow route from a pit, plus information about the high-level outlet of the basin or the surface overflow from the headwall. This can be in the form ...
Overflow route data base property sheet
This sheet allows you to set up cross-sections of overflow routes, for which DRAINS calculates flow characteristics (depths, widths, velocities and depth-velocity products). These can be displayed after a run, and are used in the DRAINS design method ...
Overflow route characteristics calculator
After a DRAINS run has been made, and peak flowrates and hydraulic grade line levels are displayed in the Main Window, it is possible to examine the flow characteristics of overflows from pits and detention basins in the page of the Overflow Route ...
Flood Mapping
DRAINS includes a flood mapping capability for overflow routes. Following a run of the Full unsteady hydraulic model you can turn flood mapping on/off from the View menu. Note that this function is not possible with the Lite hydraulic model. The ...