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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 #


The cutside drain will appear at the cut slope and the toe drain will appear at the fill slope. Both of these slope drains will be affected in the cut and fill volume report in the Road Module. Currently, the cutside and toe drain volume are only limited to the End Area Method.

Also note that the cutside drain appears immediately at the end of the road width element, whereas toe drain appears after the slope ends. This is different from Drain Reserve, which appears immediately at the end of the road width element regardless of the slope, as shown below.

Drain Reserve #

The drain reserve created in the Road Module will be automatically synced in Drain Module for analysis purposes.

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