Roz

Attenuated discharge?

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We have been told that due to potential mining activity close by that a soakawya isn’t supported at our site but an ‘attenuated discharge’ might be. Does anyone know what this means and what form it would take? 

 

Thanks a lot!! 

 

Roz

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It means that as you presumably would need to discharge into a water company drainage system, or straight into a watercourse, that you're required to ensure the runoff from your development is reduced, usually to a rate that would have theoretically existed pre-development (the 'greenfield' runoff rate).

 

It could take one of many forms, and they have varying costs so it's worth exploring the options. If you have space and the topography allows, the simplest system might be a swale (think of a green ditch) or small pond where the outlet is restricted to the greenfield runoff rate. There are various ways of making these options integrate into a garden or similar, so they don't necessarily need to look naff. If you don't have the space, then there are a number of other options for sub-surface storage. Others on here have used systems commonly referred to as plastic milk crates, but you can also do the same thing with stormwater attenuation tanks.

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6 minutes ago, jamieled said:

It means that as you presumably would need to discharge into a water company drainage system, or straight into a watercourse, that you're required to ensure the runoff from your development is reduced, usually to a rate that would have theoretically existed pre-development (the 'greenfield' runoff rate).

 

It could take one of many forms, and they have varying costs so it's worth exploring the options. If you have space and the topography allows, the simplest system might be a swale (think of a green ditch) or small pond where the outlet is restricted to the greenfield runoff rate. There are various ways of making these options integrate into a garden or similar, so they don't necessarily need to look naff. If you don't have the space, then there are a number of other options for sub-surface storage. Others on here have used systems commonly referred to as plastic milk crates, but you can also do the same thing with stormwater attenuation tanks.

Thanks Jamie this is great info. I was posting on the go so forgot to say that we can’t commect to sewer so this soakaway was in relation to a septic tank or sewage treatment plant. Does this make any difference? 

 

Thanks so much

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Attenuation Could take the form of a tank buried under your garden, into which you discharge your water. Its designed to have a large surface water base, through which the water is discharge slowly, under the tank is made up of layers of stone and sand to encourage the slow percolation into the underlying strat.

 

search attenuation tank for better details.

 

got too rush!

Edited by Triassic

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Ah sorry, it possibly does. I'm not that familiar with attenuated discharge for foul water, I'm presuming that it's because a soakaway might provide too rapid a discharge via faster pathways into the groundwater body. In that case @Triassic's suggestion is probably the best. You might not want the septic tank/treatment plant effluent in an open ditch/pond unless it was cleaned up a bit more first.

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for septic systems I've used the puraflo system before which gives you a bit of attenuation - you're going to need someone to advise the most suitable method for your site conditions and get it agreed with the local authority/environment agency chaps

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