Cathryn
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Land drainsApparently they are all over the place. I had no idea. Some of them are failing in my Mum's fields and interesting boggy places are appearing. Hopefuly some of the orchids will return as well.
Anyway, I was wondering why Victorian drains (probably) were dug as deep as at least 5' and in solid clay. There was no farm machinery that went that deep and how on earth do they work because a lot still do. When they break they are replaced by pipes laid only a few feet down and laid in gravel.
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Rob R
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Victorian drains are normally only a couple of feet deep, so they could be easily cleaned out if need be, modern drains are usually five foot under as they're more efficient (ie have more 'draw' so they can be placed wider apart) the lower down they are. Of course it all depends on the level of the outflow drain...
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Cathryn
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Ah, completely the reverse here.  Think the outflow drain tends to be the sea as well.
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Rob R
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Well, it is Wales  
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Nick
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You sure they're drains? I hear they mine rain in Wales...
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Cathryn
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I'll have you know that I have just had to go out and water my lettuces (and protect them from frost).
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