CatchmentSIM incorporates a 1D stream mapping algorithm, derived for use by the Gold Coast City Council (GCCC). This algorithm will create a water level grid and assign flood levels to cells in that grid, interpolate watercourses, interpolate a water surface grid, a water level difference grid, and carry out multiple other post processing/output features.
Required Input:
- CSV with header row with forma:t X,Y,Name,Chainage,X1,Y1,X2,Y2,Z where X and Y are points along the main channel, X1-Y2 are the cross section extent points and Z is the water level observation. Name and Chainage are ununsed and can be left blank. If you are not using the second option for Assign Flood levels, then X1-Y2 are not required.
- a polygon clip mask is useful for increasing processing speeds.
- Before running these algorithm, please import a stream network to serve as the basis for your interpolation.
- To produce an accurate innundation grid, you should already have a base project prepared where all major stream drain to a mapped outlet. Note, be careful when Breaching flats and pits to prepare the base project as any areas breached can not be later protected by levies or hydraulic controls. It's recommended that Breaching is done using a stream layer as a target zone with a small buffer, with a high break size.This should help achieve the objective of mapping all areas near streams to outlets but not inadvertently breaching any hydraulic controls.
Please refer to the documentation for more information regarding preparation of a base project.
