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Inputting Drain Properties

Drain properties can be inputted in Spread Input. Users have to select “Drain” before inputting the drain properties.


Users can input the drain properties in the Misc tab by selecting the particular drain.

Spread Input #

It is easier for users to input the drain properties by clicking the “Spread  Input”

Drain Type and Dimension #

Select the drain type by clicking the drop down list in the Drain Type column.

Call out the parameter dialog box by changing the Iterate from Yes to No in Dimension.

Changes can be made for the drain dimension by click the button at the Dimension, mm column or go to in the parameter dialog box.

Culvert #

There are two types of culverts, which are box culvert and pipe culvert. Select the drain type by clicking the drop down list in the Drain Type column. 

To add multiple culverts, click on the iteration to “No” and insert the number of openings.

Cascading Drain  #


  1. Auto – Cascading drain will be proposed at drain when the gradient exceed maximum gradient set in the parameter setting 
  2. Always Apply – Cascading drain will be applied to all drains regardless on the maximum gradient 
  3. Don’t Apply  – No cascading drain will be apply

Cascading Drain – Apply to specific drain  #

Go to Drainage > Drain > Spread Input > Constraint Parameter > change to ‘Customized’ 

Composite Drain #

To create a composite drain, users are able to assign different roughness coefficients based on the sides of the drain. Go to “Options >> Project Parameters >> Drainage >> Drain Types (choose the drain you use) >> Click on Manning >> Set the manning coefficients accordingly”

For more details on the calculation and the equation used, visit the related blog (Composite Drain Benchmark). 

Drain Category #

To add drain category, go to “Options >> Project Parameters >> Drainage >> Drain Categories >> Add Category Type”

Then to add the category in the settings, click on 

“Drain Types >> Choose the drain type you are using >> Click on Add/Remove >> Click the category you want to add in the Master List list >> Click on the right arrow to add in the Part List >> Click OK”

Then select the category in the Categories list.

The settings will be displayed in the spread input. 

Invert Level Adjustment #

Starting from MiST, user are now allowed to re-apply different default invert depth per pipe basis (apply for existing drain and newly created drain)  

Go to Drain > Spread Input > select drain/drains > click ‘Adjustment’ button on top left at the spread input 

Note: user can select multiple pipes to raise/lower the pipes 

User can choose to reset the invert depth by; 

i) Adjust from current IL 

ii) Adjust from GL 


Positive (+ve) value is to raise the IL 

Negative (-ve) value is to lower the IL 

Running Network #

Starting from MiTS version 2.9, a Running Drainage Network is introduced to allow the categorization of drains in the drainage network. The drain can now be grouped by different names (i.e Existing and Proposed).

Users can define their own drain network under the parameters settings.

Go to Options > Project Parameters > Drainage > Input Running Network > Set the Drain Network as per design > OK

Under the Running Network Name, user can name the drainage.

Example of a Running Drainage Network defined

Users can assign the drain to the system under the Spread Input for drainage properties. Once assigned, the Running Drainage Network will be reflected on the Input Screen, Key Plan, and Schematic Plan.

Go to Drainage Spread Input > Running Network > select the right system for the pipe

User can also select and assign multiple drains to a running network by following the steps below;

Click CrossPoly or WindowPoly > Select the drain > Properties > Running Network > Select the system for the drains

Change line type for Drainage #

To change the type of the line show in the drawings, user may go to

Option > Project Parameters > Drainage > Detailing > Key Plan > Drains

Define Line – will show the center line of the drain

Inner Profile – will show the inner drain line, which excludes the drain thickness

Outer Profile – will show the outer drain line, which includes the drain thickness

Inner & Outer Profile – will show a double line to indicate the inner and outer of the drain

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