Intersection point with clash or insufficient must be resolved by changing the properties (eg. location, invert level, gradient, and etc.) of drainage, sewerage, and/or water reticulation.

Example of the clash analysis and how to solve them #

Sample project file (MiTS 2): here

Sample project file (MiTS 3): here

(**There will be difference in the horizontal clearance due to the Sump/Manhole Profile available in MiTS 3)

Vertical Clearance #

Check on the pipes that clashed and have insufficient clearance. Determine the additional vertical clearance needed to pass the analysis.

Insufficient Clearance #

The entities should be highlighted in yellow in the Report – Clash Analysis as in the image below.

Drain10 Properties	Sewer5 Properties
Material thickness = 70mm Analyzed Start IL = 22.000m Analyzed End IL = 21.650m Length of Pipe =  70.00m Drain IL at conflicting point = 21.670m	Material thickness = 57mm Analyzed Start IL = 21.253m Analyzed End IL = 20.939m Length of Pipe = 62.873m Drain IL at conflicting point = 20.96m

To obtain IL at conflicting points;

Go to Utility Modules (i.e. Storm Water and Sewer) > Select the involved pipes or drains > Right-click > Show Long Section

**Note: The IL of the utility at the conflicting points should be available in the intersecting utility’s long section (i.e. the IL of Drain10 at the conflicting point is obtained from the Long Section of Sewer5)

Vertical Clearance	=	(Drain IL at conflicting Point – Material Thickness) – (Sewer IL + Inner Diameter + Material Thickness)
	=	(21.670 – 0.07) – (20.96 + 0.375 + 0.057)
	=	0.208m ~ Slight difference due to decimal places

Since 0.208m < 300mm (Min. Vertical Clearance), the clearance between Drain10 and Sewer5 is considered insufficient.

Clash Warning #

The entities will be highlighted in red on the Clash Analysis Report as in the image below.

Drain19 Properties	WaterPipe27 Properties
Material thickness = 70mm Analyzed Start IL = 20.925m Analyzed End IL = 20.782m Length of pipe = 8.464m Drain IL at conflicting point = 20.78m	Material thickness = 12.5mm Analyzed Start IL = 22.0005m Analyzed End IL = 20.750m Length of pipe = 84.217m Drain IL at conflicting point = 20.75m

Vertical Clearance	=	(Drain IL at conflicting point – Material thickness) – (WaterPipe IL + Inner Diameter + Material Thickness)
	=	(20.782 – 0.07) – (20.75 + 0.1 + 0.0125)
	=	-0.1505 ~ -0.151m

Example of Solution #

Manual Adjustment #

Users can resolve the clashing or insufficient clearance by making the changes according to the additional clearance needed to pass the analysis.

Users can directly adjust the invert level and position of pipes or drains in 3D View.

Select the involved pipe or drain that needs to be adjusted > Edit the Invert Levels of the pipe or drain

As an example, for insufficient clearance;

Additional clearance required	=	Minimum vertical clearance – Clearance computed
	=	0.3m – 0.209m
	=	0.091m

In the software #

Hence, we can lower the sewer pipe following the additional clearance as in below.

New Sewer IL = Current IL – Material thickness – Additional Clearance

Auto Adjust (BETA) – Only in MiTS 3 and above #

In our latest version, MiTS 3.0, we have introduced a new feature, AutoAdjust (BETA) to help users resolve clashes or insufficient clearances effortlessly. This feature is only applicable for resolving vertical clearance issues.

Integration tab > Under Clash Analysis group on the ribbon tab, click on the AutoAdjust (BETA) command button

Mechanism of AutoAdjust feature #

The AutoAdjust (BETA) feature is designed to automatically make the lower of the two clashing pipes or drains deeper. Users only need to click the command button as shown in the image above, and the software will identify and adjust the pipes or drains accordingly.

The software will compare the Invert Levels of the clashing entities and lower the entity located at the bottom. However, do note that this behavior depends on whether the Invert Level is fixed, or not.

Limitations of the feature #

Below are the limitations of the feature implemented following the condition of the entities.

In the software #

Why is the Drain lowered instead of the Water Pipe? #

In the video demonstration, the software resolved a vertical clash by lowering Drain19 instead of WaterPipe27 and WaterPipe28, even though the water pipes are at the bottom.

This behavior occurs because the invert levels of water pipes are considered fixed at 1.5m below the Ground Level of the nodes. Due to the said limitation here, the software can only adjust the position of Drain19 to be lower than those water pipes, ensuring a sufficient vertical clearance.

Horizontal Clearance #

Check on the pipes that clashed and have insufficient clearance. Users need to determine the additional horizontal clearance to pass the analysis.

The distance measured should be 90 degrees from the Node to the Clashing Entity as in the example below.

Insufficient Clearance #

The entities will be highlighted in yellow under the Report – Clash Analysis as in the image below.

To obtain the clearance value, users may use the feature Measure (CAD tab > Tools section) and turn on the Ortho feature (at the bottom ribbon) to easily obtain the 90 degrees.

Distance from the center of Manhole23 to the nearest 90 degrees on WaterPipe10 = 0.686m

Effective Diameter of Manhole23 (Radius of the outer diameter) = OuterDiameter / 2 = 400mm / 2 = 200mm

Horizontal Clearance	=	0.686m – 200mm
	=	0.486m

Since 0.486m < 600mm (Min. Horizontal Clearance), the clearance between Manhole23 and WaterPipe10 is considered insufficient.

Clash Warning #

The entities will be highlighted in red under the Report – Clash Analysis as in the image below.

Example of Solution #

In resolving horizontal clearance, users must make necessary and logical adjustments to the utility design, such as repositioning the pipe to ensure adequate clearance, as demonstrated in the video below.

Related Articles #

Users may refer to our guidelines – Starting Clash Analysis and Clash Analysis Outcome for more information on the Clash Analysis feature available in our software.