The Infiltration Pond pictures
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This is the 3D model that is being used for the design of this area. If you click on the picture there is the CAD drawing of the plan view.
click here for a description of the building method of the nearly vertical walls.
2017 to 2020
The pond and some of the land behind the old skatepark has been Compulsory acquired by Highways England .
If you look closely at the 2D CAD drawing you will see that the new pond/basin is called an attenuation pond. An attenuation pond is actually different to the infiltration pond that is there at present. An infiltration basin or pond is a shallow impoundment that is designed to infiltrate stormwater into the soil. Infiltration basins are believed to have a high pollutant removal efficiency, and can also help recharge the groundwater, thus restoring low flows to stream systems.
attenuation ponds are areas for storage of surface runoff that are free from water under dry weather flow conditions such as flood plains and dry basins. Ponds contain water in dry weather, and are designed to hold more when it rains.
I can't see any connection to the A14 ditch on the new drawings and I will look more into this and report back.

Here are some pictures I have taken during the work to clear the pond ready for the new flyover. The pictures are quite large so could take a while to load.


January 2017
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February 2017
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1977 to 2016
This pond is a major feature at the front of the village by the flyover. It was long assumed that it was created to take surface water from the A14 and to provide the material to create the banking of the flyover. Recent work has discovered that the main function of this pond is to accept the surface water from a large part of the village. This pond has had no maintenance for about 40 years and it has become seriously overgrown.
The water from the village enters the infiltration pond via a 1050mm diameter pipe close to position marked as 2 on the aerial view. The water collects in the pond and filters down through the bottom and is collected by a large land drain under the pond that connects to the base of the outfall to the A14 ditch shown in the pictures below. This water is carried along the A14 ditch until it joins up with the Longstanton stream and exits the village under the A14. Work started to maintain the pond on the 12th August 2015 and I have taken some pictures of the work in progress. The outfall to the A14 ditch, visible in the 1977 picture of the building of the flyover, that connects to the Longstanton stream has been found and cleared.

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Here are some pictures taken during the work on the pond. The numbers on the map give the approximate location of the pictures.


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Early picture of the infiltration pond taken
during the building of the flyover in 1977
2) The inlet pipe from the village drains
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3) The digger digging
1) The outfall to the A14 ditch
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1) The outfall to the A14 ditch (debris now removed)
2) The inlet from the Bar Hill drain before maintanence.