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Robin.Green

Infiltration Trench

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Hi there

We are currently modelling a proposed development which incorporates stone filled trenches with a perforated pipe at the base, to intercept and convey overland flow routes to attenuation ponds - and my question relates to the most suitable way to model the trenches.

We have adopted a 2m grid and the trenches are likely to have a 1m width. Out initial thoughts are to model the ditch in the 2D using a FC_Shape and apply a high blockage: to firstly represent the trench width, which will be half that of the cell size; and secondly to represent the approx void space of the stone fill - but we are unsure on the suitable loses to represent the limited conveyance resulting from the stone fill? The pipe network at the base of the ditch could be inserted within ESTRY with connections to the 2D at regular intervals to allow inflow.

To simplify this could we just adopt the FC_Shape and incorporate the pipe network by reducing the blockage and loses within its attributes?

Or would it better to model the whole lot within ESTRY and apply a 1D channel on top of the 1D pipe work along with suitable loses/blockages?

Do these seem like appropriate methodologies? Has anyone else had a similar experience, and what approach did you adopted?

Any help/advice is greatly appreciated.

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Why do you need to model the filter drain? The infiltration rate will be a lot lower than any overland flow rate, such that flood waters will not be interepted by the drain.

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Thanks for the response.

I agree that the infiltration rate of the trenches will be less than the sheet flow across the site. However, the stone filled trenches will be laid at a gradient to convey flows towards an attenuation pond - with the aid of a piped system at its base. It is possible that the trenches could be insufficient to intercept all of the sheet flow; however it is still desirable to model them to establish any short fall to inform the development of the site.

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