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I need help with a new pond

 
Dan Mcpherrow
Posts: 14
Location: Idaho Falls, Idaho
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I am thinking of using a pond as the area that we will dispose of the water used in our geothermal system instead of using an injection well.  There won't be any other water entering the pond and I don't think we will have an outlet and will rely on evaporation to keep the water level from getting too high.

Does this sound like it will work?  Does anyone know how to calculate how big a pond we will need to do this?  Will I need a fountain etc to aerate the pond?

What else do I need to know?
 
Brenda Groth
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Posts: 4434
Location: North Central Michigan
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too many what ifs

are you on flat soil or hillside, sandy or clay, full sun or shade where pond wil be, how much water is put out by the system and how large a pond did you plan? will it be a soil/clay bottom pond or a lined pond?

you can check out my pond on my blog below we are on clay and this is in a lower depression area that water naturally would settle into
 
Dan Mcpherrow
Posts: 14
Location: Idaho Falls, Idaho
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Totally flat.  12-15 inches a year of precip.  We will line the pond with clay.  It is in full sun.  We were thinking of a 60 foot by 80 foot. 
 
Brenda Groth
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Posts: 4434
Location: North Central Michigan
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flat is kinda good as there is no where for it to run away from, remember the deeper the better as shallow evaporates much faster..as our pond was very shallow in the beginning and we have been deepening it, it lasts much longer being deeper...so do deeper rather than wider to avoid too much evap you can always enlarge.
 
Caleb Larson
Posts: 76
Location: Missoula,MT
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How many GPM is your ground source heat pump going to use?  Most of the systems I have seen use  very high volume.

I assume that since you are talking about a dump you are using a pump and dump system not a closed loop.  Is this system already installed?

I work a lot with condensing boilers solar thermal systems, and bio mass boilers.  I do not install Geo Thermal, but I do get the opportunity to see many systems, so I do have some knowledge about them.  However most of my knowledge is based on systems that are not working properly, and pump and dumps that do not have an adaquete recieving well are very common in our area.

My main concern is pulling a high volume of water out of the ground and not replacing in the earth.  Are you pulling from an aquifer?

I do think that a keeping a pond as a useful production is a cool way of maximizing the energy used in pumping the water though.
 
Tyler Ludens
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Posts: 9452
Location: Central Texas USA Latitude 30 Zone 8
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I share Caleb's concerns.  A pond in that kind of environment (low rainfall)  will be evaporating vast amounts of water. 
 
Caleb Larson
Posts: 76
Location: Missoula,MT
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H Ludi Tyler wrote:
I share Caleb's concerns.  A pond in that kind of environment (low rainfall)  will be evaporating vast amounts of water. 


I do have some concerns on the math of the amount of water.

However I do think it could be a really cool integration if done well!

My thought would be to do a really large pond with rain water harvesting features, fill it with the Ground source water and harvested water over time and then switch from ground water source to a closed loop with a pond heat exchanger, or pond sourced open loop.
 
              
Posts: 238
Location: swampland virginia
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Build a pond. (or two) - appropriate sized (one in sun, one in shade?)
Run your closed loop into the pond.
Congratulations. You saved money and it's cheaper.

Unlimited ways to improve on this.
Storing winter chill for summer cooling.
Storing summer scorch for winter heating.
Hooking cooking, refrigeration, hot water heater, etc into system.
 
Tyler Ludens
pollinator
Posts: 9452
Location: Central Texas USA Latitude 30 Zone 8
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In a dry climate a pond will evaporate over the summer unless refilled.  At least that's what they do here except in wet years.

 
2017 Permaculture Design Course at Wheaton Labs
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