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Overview The CMSS model uses land use and nutrient generation data to predict the nutrient load (or load of any other pollutant) reaching the waterway of a catchment. Land management data are then incorporated into the model to predict the impact of various land use and/or land management practices on pollutant loads. The model can also assess the cost of various practices, making this an ideal tool for catchment managers. WinCMSS WinCMSS is an implementation of CMSS in a Windows Environment. It contains the same models and has the same data requirements of CMSS, but provides extra mapping and reporting features. It also takes advantage of the standard Windows interface such as toolbars, drop down menus and multiple windows to enable easy navigation around the program. Features Some of the features of WinCMSS are: Multiple windows that can be opened

simultaneously, eg catchment views, mapping unit views, results in text, graph or map form;

Modification of catchment data is interactive; Most of the setup of applications is automatic; Data input is through standard Windows

dialog boxes; Catchment regions, subcatchments and

mapping units can be manipulated with the mouse and land use information and routing links are easily editable; and

Utilities for converting DOS CMSS applications and maps to WinCMSS.

Data Requirements The model requires the following information to predict loads for the existing (or base) catchment: a subcatchment map; a land use map with land uses differentiated

by nutrient generating capacity; and nutrient generation rates for these land uses.

Terrors CreekTerrors CreekTerrors CreekTerrors CreekTerrors CreekTerrors CreekTerrors CreekTerrors CreekTerrors Creek

Sandy CreekSandy CreekSandy CreekSandy CreekSandy CreekSandy CreekSandy CreekSandy CreekSandy Creek

Mount Samson CreekMount Samson CreekMount Samson CreekMount Samson CreekMount Samson CreekMount Samson CreekMount Samson CreekMount Samson CreekMount Samson Creek

Kobble CreekKobble CreekKobble CreekKobble CreekKobble CreekKobble CreekKobble CreekKobble CreekKobble Creek

Rush and Forbes CreeksRush and Forbes CreeksRush and Forbes CreeksRush and Forbes CreeksRush and Forbes CreeksRush and Forbes CreeksRush and Forbes CreeksRush and Forbes CreeksRush and Forbes CreeksNorth Pine RiverNorth Pine RiverNorth Pine RiverNorth Pine RiverNorth Pine RiverNorth Pine RiverNorth Pine RiverNorth Pine RiverNorth Pine River

Landuse

croppingimproved pasturepineapple plantationspecialtree plantationunimproved pastureresidential

Example of Subcatchment Land Use Map from GIS

In addition, data on land management practices and changes in land use are required to assess the change in pollutant load that may result from the implementation of these. Policies Land use policies describe changes in land use for both diffuse and point source land uses. Land use policies can be very complex, specifying where the change can occur (on land of a particular slope class, for example), how much land is converted and the expected compliance. Land management policies describe the adoption of land management practices (for example, installation of wastewater ponds below dairy sheds). Policy sets can be created that enable groups of policies to be run simultaneously.

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Land Use Policy Setup Dialog Box

Results WinCMSS has major advantages over CMSS in reporting results. Results can be displayed as spreadsheets, graphs and maps that can be printed, saved to a file or imported into word processing applications. Spreadsheets are fully configurable. Data

from any model run can be included in spreadsheet reports and data from different model runs can be compared.

Graphs can display results of one to five model runs. Graphs are fully configurable, including options for log axis, gridlines, bar widths and colours, absolute or percentage plots and displaying uncertainties.

Estimates of result errors are generated using input parameter uncertainties.

In maps, subcatchments are colour coded to indicate the magnitude of load exported or the percentage change in load between model runs.

Availability WinCMSS is available for download from the Catchment Modelling toolkit website http://www.toolkit.net.au. The User Guide, CMSS Tutorial Book, and NEXSYS expert system for estimating nutrient generation rates are also available.

Example of Graphical Output

WinCMSS Program Group The Program Group consists of six icons. The functionality of each is outlined below.

WinCMSS Application

CMSS Data Conversion Utility to convert CMSS projects to WinCMSS

CMSS Map Conversion Utility to convert CMSS maps to WinCMSS format

Map Sparsing Utility trims down number of co-ordinate points in any map file for importing to WinCMSS

Uninstall

Contact Susan CUDDY CSIRO Land and Water GPO Box 1666 CANBERRA ACT 2601 Ph: +61 2 6246 5705 Fax: +61 2 6246 5845 email: susan.cuddy@csiro.au