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Road Drainage System: Difference Between CutSide Drain and Drain Reserve

It is a necessity to provide a proper drainage system in road design as excess moisture not only brings negative impacts on the engineering qualities but also on the user’s safety. Road drainage system is designed to properly collect, remove, and dispose of the surface and subsurface runoff, preventing water ponding on the road.

How to Insert CutSide Drain and Drain Reserve in The Road Design? #

In MiTS 2, road drainage features CutSide drain (Slope drain for cut and fill area) and Drain Reserve which can be opt as follow;

Road Module > Road Width > Spread Input > “+” sign


The Difference of CutSide Drain and Drain Reserve? #

CutSide DrainDrain Reserve
PurposeFor the protection or stabilisation of road structure that is in cut or is on high embankment. It collects and moves the runoff fully away from road reserve to a nearby water body. It also continuously intercepts the runoff from adjacent land to flow towards the road reserve.It is a small part of land that has been set aside for drainage purposes, maintenance, pedestrian walkway, and provision of pipe services. It collect runoff from carriageway, shoulder, and nearby catchment areas of higher ground.
LocationLocated at the edge of the cut or fill slope of the road.It is part of the road reserve, located between shoulder and service reserve of the road.
Shape & DesignTrapezoidal in shape given by the cutting of the subgrade soil at an appropriate range from road surface.Open and close drain of various shapes and sizes as per design.

Cross Section #

CutSide Drain #

From this keyplan view (Image 1), we can see that at chainage 0.000 is a cut area whereas at chainage 225.000 is a fill area.

Image 1 – Keyplan View

When we zoom in into the keyplan at chainage 0.000 which is the cut area (Image 2), we can see each platform generated which is the carriageway, cutside drain and slope.

Image 2 – Plan View at Chainage 0.000

When we look at the cross-section at chainage 0.000 (Image 3), we can observe that the cutside drain appears at the cut slope, immediately at the end of the road width element.

Image 3 – CutSide Drain at cut area

And for the keyplan at chainage 225.000 which is the fill area (Image 4), we can see each platform generated for the carriageway and toe drain.

Image 4 – Plan View at Chainage 225.000

Whereas the cross-section at chainage 225.000 (Image 5) shows that the toe drain appears at the fill slope, after the slope ends.

Image 5 – Toe Drain at fill area

Both of these slope drains will be affected in the cut and fill volume report in the Road Module. Currently, the toe drain volume is only limited to the End Area Method, but the cutside drain volume appears in all methods– DTM, End Area or Grid method.

Drain Reserve #

The drain reserve created in the Road Module will be automatically synced in the Drain Module for analysis purposes. For Drain Reserve, it appears immediately at the end of the road width element regardless of the slope.

Image 6 – Drain Reserve

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