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Farm Building and Infrastructure
Buildings & Infrastructure
New Water main across and drainage ditch
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<blockquote data-quote="goldeneagle" data-source="post: 7812015" data-attributes="member: 18962"><p>All depends on the type of soil your are digging through (infiltration rate), depth of trench and where the water table is sitting at. </p><p>A sump upstream of the coffer would be good to ensure pump always remains primed during digging process.</p><p>Have built a few coffers over the years which consisted of fence posts and potato box sticks for various activities. You don't need to have them water tight as long as leakage rate is low enough for a pump to keep up with you will be fine, I used a 1" outlet SIP submersible pump to keep a pit dry enough to work on in a field that was ponded.</p><p>I recently put a water pipe through field with a bog area which had about 1.5 meters of head from a ditch the other side of it which then was piped underground (ditch fed dam downstream back in 1900s and pipe too small for ditch flows in winter) , dug a relief trench to main trench then pumped that out in order to get trench bottom sanded, pipe layed and sanded then cover in. Biggest issue had was ponded water on surface flowed in to trench and debris (grass, leaves etc) kept blocking pump suction. 3" pump used and can pump about a cube a minute if i recall correctly, hired it for 25 quid a day and better to have extra capacity.</p><p>It wasn't the most enjoyable of tasks but can be done just need to be prepared.</p></blockquote><p></p>
[QUOTE="goldeneagle, post: 7812015, member: 18962"] All depends on the type of soil your are digging through (infiltration rate), depth of trench and where the water table is sitting at. A sump upstream of the coffer would be good to ensure pump always remains primed during digging process. Have built a few coffers over the years which consisted of fence posts and potato box sticks for various activities. You don't need to have them water tight as long as leakage rate is low enough for a pump to keep up with you will be fine, I used a 1" outlet SIP submersible pump to keep a pit dry enough to work on in a field that was ponded. I recently put a water pipe through field with a bog area which had about 1.5 meters of head from a ditch the other side of it which then was piped underground (ditch fed dam downstream back in 1900s and pipe too small for ditch flows in winter) , dug a relief trench to main trench then pumped that out in order to get trench bottom sanded, pipe layed and sanded then cover in. Biggest issue had was ponded water on surface flowed in to trench and debris (grass, leaves etc) kept blocking pump suction. 3" pump used and can pump about a cube a minute if i recall correctly, hired it for 25 quid a day and better to have extra capacity. It wasn't the most enjoyable of tasks but can be done just need to be prepared. [/QUOTE]
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New Water main across and drainage ditch
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