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Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/28/2011 11:23 PM

I'm putting in a duck pond which I will drain to water fruit trees. I have the natural slope in my yard so that the highpoint is almost a foot higher than the lowpoint. The issue is that if I dug the duck pond three feet, as i would like, I'd lose the slope. So I can bury the siphon at three feet in the pond, and dig a three foot trench (keeping the slope) till I want it to discharge, about 10 feet later. The issue here is my water at discharge is three feet underground.

So here is my question.

how do I bring the water up, and can I? I was thinking that at the discharge, two and a half or three feet down, I would dig a cylindrical hole, about 8 inches in diameter, and line it. The water would have nowhere to go but up. But my question is, will the pressure of the filling cylinder at the discharge of the siphon stop the water flow and just level out? When the water gets to surface level I'm planning on having it flow straight into watering trenches for the trees, and it will go along with the downhill slope of the yard once it hits the surface. But will the filling cylinder stop the water from flowing?

Any help would be greatly appreciated- Thanks!

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#1

Re: Gravity siphoning a pond- siphon is underground, moving water to ground surface?

05/29/2011 8:32 AM

You might consider creating an earthen wall around the duck pond using the soil you excavate to create the wall. With some clever landscaping you should be able to remove the soil to a depth of only a foot, using this soil to create a two-foot high wall (or berm), thus yielding a net 3 foot depth to the pond. You could line the pond with waterproof fabric, and use grass, rock and shrubs to make the wall look natural. Install a buried pipe running to the low end of the yard, exiting at the bottom of the wall, and use that for irrigation.

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#2

Re: Gravity siphoning a pond- siphon is underground, moving water to ground surface?

05/29/2011 9:11 AM

First obtain the written permission from the ducks, (according to some cartoons they may become agitated.

The water will flow as long as the water level in the pond is above the the outlet point , any mm above that will require a pump.

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#3

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/29/2011 10:46 AM

USB has a very valid point. Just build the duck pond higher with the excavated soil so that you have achieved a positive grade downward to fruit trees. Using a buried siphon is just complicating things, plus the darn things always plug-up with leave clutter and other organic debris as well as deposited soil. As an alternative you could always use a garden hose siphon installed on the surface instead of a buried one.

Anyhoot, keep it KISS! Why go through all the effort of building and opertaingr a siphon system that will not work as intended nor is entirely controllable (water flow rate) without getting into more complexities? Let gravity do all of the work instead. All you have to do is build a small edge of pond surface spillway that is a few feet higher than your highest ground point that needs irrigation, which discharges into a surface swale so as to transport the water to where you need it. Make sure that the spillway is adjustable to vary the water flow, as you don't want to flood the tree roots too much resulting in dead trees. I would suggest using a piece of pressure treated lumber oriented edge-on and secured into place with a row of solid concrete blocks each side of the board. Make sure you line the upstream and downstream sides of the spillway and the swale with cobblestones to prevent erosion.

Provide at least a 1.0% grade (1 foot vertical drop for every 100 feet of horizontal run) on your drainage swale.

Good luck!

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#4

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/29/2011 11:55 AM

You can still dig down at the lowpoint,your ground level is the bottom of the pond so you will still have the slop and the depth you wont.Do your drainage first,then your liner,the ground at the bottom of pond leveled off,the over flow to feed the trees with water will come when you do the ground work first.Good luck.

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#5

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/29/2011 11:02 PM

If you drain it, won't it function pretty poorly as a duck pond?

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#6

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/29/2011 11:46 PM

Who's going to be the lucky one to start the siphon each time? That would suck

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#9
In reply to #6

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/30/2011 8:59 AM

Mmmmmm pond scum taste good, didn't ya know that? LOL

I vote that Linda Lovelace sux on de hose!!! ROTFLMAO

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#7

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/30/2011 12:09 AM

Seechet welcome to CR4.

I have a hard time understanding your problem. If the water table is unconfined and just one foot below grade, it would seem to me that the roots of any tree will also be in the water table.It also seems to me if such conditions exist, you must be living on or near a marsh. Is watering necessary? There should even be springs near the lowest end of your property. If you have a well, measure the static water level (the level when the well has fully recovered and is not being pumped). That level may be the surface of your water table. If you have a well and it is obtaining water from a confined aquifer, the level in the well may be different than the unconfined surface well. Be sure you differentiate the two types of aquifers.

However, since you live there and the house hasn't sank, it may also mean that the water table is deeper than you think. Be prepared to install a hole much deeper than you want if you are using water table water to fill the pond (that is the normal situation for a pond). Try a test hole to see how deep you may have to dig. You may just be digging a large dry hole and rue not doing more research.

If you are using roof water, or some trucked water to fill a reservoir of water, then the question is why bury it at all and simply place a storage tank on the ground where it is most practical to fill and empty.

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#8
In reply to #7

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/30/2011 3:12 AM

thanks everone for your response. I can see through the answers the ways in which I didn't fully place my question, but I think the general idea of it was to keep it simple. I don't live in a marsh, I'm putting in a duck pond. I'm going to replace the water in the duck pond with a hose, and i'm using the drainage to water fruit. I want to make it look pretty in a suburban size yard, and I've simply been watering orchards for a few years, so I know how pretty a gravity fed ditch irrigation system looks flowing. I am reluctant to build up walls for landscaping allure. But i suppose that the response given by "Landscape"- along with others, has reasoned me into digging minimally, and most importantly starting from the drainage, thank you for that "Landscape"- and I'll have to build a slight retaining wall with a simple culvert. Thank you all for the common idea of keeping it simple, it saved me from a bit of digging and a lot of wasted water- appreciate the comments

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#10
In reply to #8

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/30/2011 11:42 AM

Hi mate,good luck with your pond and thanks,you will get there in the end without all of the hard work and bother.Have you drawn a plan and marked out your area,all the best.

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#11

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/30/2011 3:37 PM

If the left had side represents the water level in the duck pond and I cut the tube off (2A) (1 foot) on the other - what would happen?

What would happen when the duck pond water level dropped a foot?

What would happen when it rose again?

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#12
In reply to #11

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/30/2011 4:06 PM

you'll need to install an anti-vortex drain cover per code After all, this is a swimming pond! LOL

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#13

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

05/31/2011 11:57 AM

My question concerns the source of water for the pond. Let's just assume groundwater is not available for the pond, so it is filled by runoff, a stream, or your garden hose. If you excavated a three foot deep pond and installed a drain at the bottom of the pond, the pond would drain completely. If you were to extend the drain in the pond to an inch above the discharge area elevation, all water entering the pond above this elevation would flow into the extended pond discharge and flow to the irrigation area. Pond level could be controlled using a gate on either end. Gates are available with an extended valve stem that can be opened from the top, say off a short dock. Using a gated outlet at the bottom of the pond would allow you to drain the pond for maintenance purposes. Clogging of the outlet at the bottom of the pond is another consideration. It will clog with silt and other debris, so an appropriate pond outlet structure should be used if located at the bottom of the pond.

Hope this helps.

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#14
In reply to #13

Re: Gravity Siphoning A Pond- Siphon Is Underground, Moving Water To Ground Surface?

06/03/2011 1:01 PM

I really appreciate all your comments and suggestion; how nice the modern age is. I will surely do it differently now than i was originally thinking, thank you everyone!

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