Novapoint Online Documentation

To be able to run Water Runoff Calculations, one must first run a Water Runoff Analysis.

The function is started from the main toolbar in the DTM Viewer:

Tools > Analysis > Water Runoff Analysis

The resulting analysis data is stored as objects in terrain model group 100000 with the following feature codes:

990 - Road Model Slope Data (if present)
991 - Water Drop Paths
992 - Water Drop Collection Points
993 - Water Drop Basin

Generally - we recommend to run Water Runoff Analysis on a separat terrain model designated to this purpose. If doing otherwise, it is important to turn off group 100000 when using the terrain model for profile/section generation or other height dependant operations.

Road Model Wireframes

Wireframe Boundaries

If you run the analysis with a Road Model Wireframe present and active within the terrain model, the analysis will regard this boundary as a stop line when calculating water drop paths. Water drops will stop and accumulate at these locations (Water Drop Collection Points). This version of the analysis will not try to calculate the water drop path from this point and onwards.

Road Surface Runoff

This version of the analysis will not calculate runoff from road surfaces in the wireframe model.

Road Surface Slope Analysis

With a Road Model Wireframe present, the function will do a surface gradient analysis. This can be usefull to identify potential “flat” areas that require special attention when dealing with drainage along the planned road. The result can be viewed using the appropriate drawing rule in the DTM viewer.

$Area	Returns the Area value (m2)
$C	The C value of a single row
$DeltaZ	Returns MaxZ - MinZ (m)
$MinZ	Returns the minimum Z value of the sub-area (m)
$MaxZ	Returns the maximum Z value of the sub-area (m)
$MaxLen	Returns the length of the longest waterdrop path within the sub-area (m)
$MaxLenDeltaZ	Returns MaxLenMaxZ - MaxLenMinZ (m)
$MaxLenMinZ	Returns the minimum Z value of the MaxL waterdrop path (m)
$MaxLenMaxZ	Returns the maximum Z value of the MaxL waterdrop path (m)
$MaxLenSlope	Returns the slope of MaxLen (m/m)
$PointCount	Returns the no. of waterdrops within the sub-area

The following functions can be used to retrieve information from a table, and used to calculate new variables or formulas:

$AreaSum	Returns the sum of area values of the area column (m2)
$AreaMin	Returns the lowest area value of the area column (m2)
$AreaMax	Returns the largest area value of the area column (m2)
$AreaAvg	Returns the average area value of the area column (m2)
$CSum	Returns the sum of C values of the C column
$CMin	Returns the lowest C value of the C column
$CMax	Returns the largest C value of the C column
$CAvg	Returns the average C value of the C column
$DeltaZSum	Returns the sum of DeltaZ values of the DeltaZ column (m)
$DeltaZMin	Returns the lowest DeltaZ value of the DeltaZ column (m)
$DeltaZMax	Returns the largest DeltaZ value of the DeltaZ column (m)
$DeltaZAvg	Returns the average DeltaZ value of the DeltaZ column (m)
$MaxLenSlopeSum	Returns the sum of MaxLenSlope values of the MaxLenSlope column (m/m)
$MaxLenSlopeMin	Returns the lowest MaxLenSlope value of the MaxLenSlope column (m/m)
$MaxLenSlopeMax	Returns the largest MaxLenSlope value of the MaxLenSlope column (m/m)
$MaxLenSlopeAvg	Returns the average MaxLenSlope value of the MaxLenSlope column (m/m)
$RowCount	Returns the number of selected downfall subareas
$GridSize	Returns the GridSize of the Grid Model (m)

Datatables

 <DataTables>
   <DataTable ID="TestDataTable">
     <Coulumns>
       <Column ID="COL0" Width="200" Name="Title" IsDataColumn="False"/>
       <Column ID="COL1" Width="50" Name="Header" IsDataColumn="True"/>
       <Column ID="COL2" Name="Col. 2 header"/>
       <Column ID="COL3" Width="70" Name="Last header"/>
     </Coulumns>
     <Data>
        First row   | 10 | 20 | 30 |
        Second row  | 40 | 50 | 60 |
        Last row    | 70 | 80 | 90
     </Data>
   </DataTable>
 </DataTables>

To activate a table as a menu item:

 <Menu>
   <GetValue Type="DataTable" Text="Get value from table" Table="TestDataTable" />
 </Menu>

Water Runoff Analysis

Overview