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Looked up the water dam on construction sites it says that it creates a dry area where repairs or construction can take place. Thanks for the responses. Never saw this technology used before.
I still don’t get what they’re doing there. I live just up the road from this and I’ve been wanting to post a picture of it here for two months now!
Are they using the water weight to force water out of the ground? It’s a vacant lot that I’m thinking someone is going to build on. But wouldn’t the water in the ground just come back after the bag is removed? It is right on the channel there….
It’s not a dam! Or at least, if they’re using it as a dam, that’s an incredibly expensive and inefficient version of one. It is absolutely a dewatering bag. They fill it with some very wet material or very dirty water and the water seeps out over time. Timelines depend on materials and volume. If it’s been there for months (and is always full of something), they’re probably draining out the material at the bottom of a pond or marine environment.
Yes, this what it is. Specifically it’s a filter for dewatering effluent that comes out of dewatering wells or sumps. The effluent is high in suspended solids or other unwanted constituents and the bag may contain a filter medium like sand. The water goes in one end and out the other and is cleaned along the way to levels permissible for discharge to a storm drain, creek, or other water body.
Does dewatering make sense in this configuration? It sounds like it's been there for two months. I'm wondering if it's double duty dewatering and preloading the soil?
These dewatering bags will be out for many months depending on the volume of water needing to be filtered! They dredged the pond in my town and they had a dozen of these bags out for almost a year. After they left the lot had been raised several inches with all the silt collected
One feeling filling of pure water would drain completely in about a day, in my limited experience. If there's very little sediment, you can see it leaching out of the side in a continuous flow
EDIT: Siri doesn’t understand my English, maybe I said it with a Mexican accent (not my accent)
In some it’s part of a linked treatment train with multiple bags with different filter media for different constituents. The flow can be continuous with tens of gallons per minute flowing both into and out of the end into the storm drain. Dewatering is a continuous process, not something you do and stop, at least until waterproof foundation is poured.
I was a project manager on a site that used them, if I recall correctly mine (actually the one that I’m familiar with) had a filter material on one end and the one I worked with contained quite a bit of sediment. My question is how do they empty the settlement? Is there a zipper on one end? 🤪
Yeah, it’s not damming anything. Still no definitive rational answer in this thread. At least nothing answering the question”why?”, just the “what?”. Guess I’ll repost over at r/whyisit.
They did this at my golf course when we needed to dredge the pond and remove the fine silt that had accumulated over time. They pump the muddy water into this bag and let it dry out over the summer. Then after it’s all dry, they cut open the bag and shovel the dry silt into a truck and take it away. The alternative is you just pump the silty/muddy water out and let it go but in dense areas or if you’re near a environmental critical area like we were (stream) the fine silt will cause damage.
My lake community used this method to dredge a shallow cove that had been filling in over the decades. When it’s all done the compost inside it is insanely rich…the gardeners in the neighborhood got to take some and were so excited.
OK, I've read this description several times in the thread. Let me see if I have this right:
Someone is dredging sediment from the bottom of a pond. This sediment is saturated with water, or is a slurry, and they want to have a drier material to use or dispose of.
Sediment slurry is pumped into this big bag, and the bag is permeable to water. It is sitting on top of soil. Water weeps out of the bag and is absorbed by the soil underneath, while the sediment solids are retained in the bag.
After months, the water is largely gone from the bag, and it can be opened to scoop out the relatively dry sediment that remains, which can be used for other things.
Surcharging is placing weight over a site to speed up soil settlement, so when you build your structure, the soil is already settled and the structure doesn't sink.
Dewatering is removing water from an area of soil to accommodate excavation.
If it's been sitting there for months with no activity like OP has said, it is probably meant for surcharging as the sediment would have dewatered by now. Placing a giant bag of water for two months would be a pretty easy way to surcharge the property without bringing any heavy equipment in.
True. I had no problem with the facts of your comment explaining the two things.
I just doubt they are dewatering anything if they filled the bag two months ago as any excavation would refill overnight and there isn't an excavation visible and there isn't evidence of a pond to pump muck from (because you can't load these with an excavator).
Ive actually bid work that was going to use a dam like this. Basically, its a catch bag, fills up with creek water, swells into the side and silts itself in. Leaves the creek bed after to dry out so you can work on it. Ive seen that once in 10 years though. This, as you've stated is a dewatering bag. Most like a sump pump to drain a pond or some other such feature. Depending on how big the pond or body of water is, and noise ordinances in the area which might reduce pump sizes to have whisper pumps, and any regulations on discharge rates which again would reduce pump sizes, that will determine how long it might take. It does look fun to bounce on though!
Correct answer! We used them for removing ash from settlement ponds. Had a floating dredge remover 90% of the ash & the rest we removed using these bags. We had about a dozen going at one time. Pump water with sediment into bag, sediment staying in bag, water returns to pond by gravity.
Allows water to leave the jobsite without silt loss. Any soil that has been hauled on site that drains from a state job must be recovered. State environmental monitors this weekly and after any rain event.
We would use them in dewatering in construction. If we have to pump out an excavated pit, we pump the water into a dirt bag, and just like you described, the water flows out but the bag retains the soil.
Do you ever see the bag empty or flat? Really fine silt/sediment will plug a filter bag up and can potentially rupture, resulting in that slurry going in places you most definitely don’t want it to go.
This is it. A geotube. You pump water with solids in it, let it sit, the water percolates through, so you can haul it dry to the landfill. Source: I am an Environmental Engineer
I can actually add context to this. This is a bag for environmental dredging. They likely pumped excess sediment from the damn area in this back. You can see the inlet pipe above. Sediment and water go in, only water run out. They'll be back to clean the bag up and collect the dried material in dump trucks eventually.
I used to do this for work, so there you go!
It's an aqua dam. Used for water storage/ water deflecting. There are some cool pics on their website if people using them in flood plains to save their homes. Most people I know use them to store water for weed crops
It is a big bag full of water used to surcharge the existing soil to increase the bearing weight of the soil. It is often done with dirt, but you need trucks and machines to move the dirt.
That is a sediment dewatering bag for hydraulic dredging. You pump sediment from the lake bottom into the bag and allow the water to filter out clean and clear, relatively speaking. Trucking wet sediment is extremely expensive.
If it were a hydro dam it wouldn't be so wide, it would be taller and narrower. Also, what the hell would that be protecting, water would get around it.
This is the answer. I’m an engineer and have specified many vacuum dredge projects. This is a dewatering bag, likely on a lake with known non-hazardous contaminated lake bottom soils that need to go to a Class II landfill. Most landfills have moisture limits for soil disposal and, depending on weather conditions, in can take many months for the dewatering bag soils to dry enough for transport to the landfill.
are these the “greywater” bladders i have seen for sale in my search to find a (unique) solution for diverting rainwater temporarily? I didn’t know what they were used for. I’m looking at a 2000 gallon bladder that can withstand being rolled up when not in use and stand up to uv rays.
This is the answer. I worked in excavation. When you pump dirty water out (pond, storm sewer, water reservoirs) this filters the debris to keep from dirty water re-entering the storm drain.
I worked at a sewer utility where we used bags like this at a treatment plant. We pumped partially treated sewage in through the hose in the top. The water would slowly drain out through the sides. The water was captured and returned to the beginning of the treatment process. When the remaining sludge in the bag is dry, the bag is cut open and machines scoop it into dump trucks and haul it to the landfill.
In this case, they probably pump dirty ground water out of holes they dig for new houses, then, once the water has drained and the dirt is dry, they’ll probably use the dirt on site.
Is this near a construction site? Oftentimes dewatering bags are required to filter sediment when pumping water out of a possibly contaminated construction site.
It might be a sludge dryer. We had those in our housing development. Over the decades, our drainage ponds were slowly filling in. They pumped the sludge off the bottoms but it’s logistically difficult to move that away easily. So, they put them in giant retainers like this one for a month or two.
Slowly, what’s inside it dehydrates. Eventually, they split it open, let it dry a bit more, and then collect the dried up sludge and move it to its final resting place - wherever that may be.
That looks like a geobag that they are using to dredge. They pick up the sediment and other solids with a diver or dredge barge and pump it into one of these bags. The bad collect the solids and the fairly clean liquid portion is allowed to return to the body of water. I have had these used on a wastewater treatment basin to remove sludge, we ponded up the water with a plastic containment and pumped it back into the wastewater system.
It’s to filter out the silt and let clean water out. YOURE not supposed let silting muddy water into creeks and such. Environmental folks will fine the hell out of you.
Probably need to get rid of excess water but it’s too muddy to let it into the storm system so they are cleaning in to let fresh water into the storm.
They are removing silt from the body of water. Basically suck up fine silt and water into that big bag. The bag is basically fabric so the water can sweep out and flow back into the lake/pond. Any ultra fine silt that comes out with the water should be caught by the construction silt fence they have around the bag.
in my line of work it was called a silt sac. The water gets pumped into it and the silt and fines remain inside and the water drains slowly out "if this is the item I think it is". The bigger issue is the removal of the item when the job is complete all the silt and fines are inside and heavy af.
chances are, they dredged something - a pond or whatever. they put the output in these bags then leave them for quite a while - a year. at the end, all of the water is gone, and they strip of the bag. you have good dirt.... lookup hydraulic dredging and dewatering with geo-bags
They used something like this when they dug out spoil from a canal near near. Over the years debris filled up a pond. This arrangement was setup with a vacuum that sucked mud out of the pond. The water drained back into the pond the dried mud was later trucked away.
dredge bag, big vacuum sucks up muck/sediment from bottom of lake and puts it into bag, bag is like a big filter, holding solids and allows liquid to flow back into lake so muck eventually dries down into dry muck and that shit makes great soil amender. Used in waste water treatment final settling/clarifier basins all the time and for small lakes/ponds to remove top soil that washed in.
Its not a portable dam, although they can be used as them for E-dike repair and the like, but they are slow to fill so limited use cases To strengthen/build up a weak area, not an area that blew through the dike already.
I saw this on Dirty Jobs! They are dredging the area in front of the lot; the "bag" is there to contain the solids and slowly drain out the liquids much like an above-ground septic tank, then the remaining dry solids can be picked up later in the bag.
This is a sediment bag, water is pumped out of a construction zone and into this bag, this bag works as a filter to filter out any sediment before it drains back out into a water source downstream. -someone who has worked with these bags many times.
It looks exactly like a pool bladder, I use them when I fix swimming pools, pump the water into it, then we can reuse the water back in the pool (it can be more than 1500$ to fill them). However, 2 months is way too long for that
It’s a water bladder. I’ve used them on emergency response clean ups. Your water lines or damages or your source has contamination. It’s just a way to hold a lot of water temporarily when the main supply is not accessible.
It basically a big filter. Dirty water pumped out of a work area gets sent through the sac to catch debris and silt. Containing silt protects near by waterways, lowlands, and city water control like curb and storm drains.
Pure guess but was any dredging happening in the water? Looks to be a bag they pump the material into that allows the water to drain back to the lake. It should sit for a while until it dries as it is heavy when wet.
Is a sediment bag, they are probably working close to a river or creek, so they are disturbing the river bed so they pumping water there to pretty much filter it before going back to the water source
My guess is a weight to keep a finished basement from heaving in a high water table area (lakefront). The weight of the house above will keep the basement "submerged" after the house is built.
It’s a silt bag. Water being pumped on a construction site has to be filtered through a cloth bag No cloudy water can be released downstream or job site can be fined heavily and shut down
It’s a dewatering water quality bag. Usually a requirement for construction to use some sort of mechanism to ensure contaminants from construction don’t enter the local waterways.
It’s a silt bag… essentially a giant filter. Pump dirty water in and clean water comes out. It’s to avoid your cities sanitatiary system from filling up with tons of „mud“
It could just be for storing water, they also make them that separate water from sediment. So it basically allow the water to leave and retain the dirty settlement for removal.
Reminds me of an army blivet, used for water storage. Typically they pump one full of untreated water, then send it through a filter system into a clean/potable water blivet.
Is it near a body of water? Looks like a “bladder” used when dredging. This gets filled up with sediment. The contents dry inside the bladder before they transport it.
two months is a long time for this suggestion, but when my brother has his in ground pool liner replaced they pumped the pool water out into something very similar.
I just took down a portable pool here in California and the ground under it is like concrete so I believe it if they trying to surcharge the ground for a building.
Sediment filter bag. You run construction runoff through it, the water passes through but the filter strips the sediment out before releasing back into a stream.
Sediment bag. We use these sometimes to clean municipal tanks. If the sediment can’t be discharged on the ground it comes through here and the water seeps out
Did they recently dredge the water hole?
Pump out the sediment into the bag and let the water drain out.
No idea where you are, but op said waterfront.
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Looked up the water dam on construction sites it says that it creates a dry area where repairs or construction can take place. Thanks for the responses. Never saw this technology used before.
I still don’t get what they’re doing there. I live just up the road from this and I’ve been wanting to post a picture of it here for two months now!
Are they using the water weight to force water out of the ground? It’s a vacant lot that I’m thinking someone is going to build on. But wouldn’t the water in the ground just come back after the bag is removed? It is right on the channel there….
What am I missing?
It’s not a dam! Or at least, if they’re using it as a dam, that’s an incredibly expensive and inefficient version of one. It is absolutely a dewatering bag. They fill it with some very wet material or very dirty water and the water seeps out over time. Timelines depend on materials and volume. If it’s been there for months (and is always full of something), they’re probably draining out the material at the bottom of a pond or marine environment.
Yes, this what it is. Specifically it’s a filter for dewatering effluent that comes out of dewatering wells or sumps. The effluent is high in suspended solids or other unwanted constituents and the bag may contain a filter medium like sand. The water goes in one end and out the other and is cleaned along the way to levels permissible for discharge to a storm drain, creek, or other water body.
And since you haul the remainder out by the ton, it saves a lot of money hauling it mostly dry.
Does dewatering make sense in this configuration? It sounds like it's been there for two months. I'm wondering if it's double duty dewatering and preloading the soil?
These dewatering bags will be out for many months depending on the volume of water needing to be filtered! They dredged the pond in my town and they had a dozen of these bags out for almost a year. After they left the lot had been raised several inches with all the silt collected
bag can stay there for up to a year or so... see hydraulic dredging and dewatering with geo-bags
How fast does the water come out? I’m curious what is too much?
One
feelingfilling of pure water would drain completely in about a day, in my limited experience. If there's very little sediment, you can see it leaching out of the side in a continuous flow EDIT: Siri doesn’t understand my English, maybe I said it with a Mexican accent (not my accent)In some it’s part of a linked treatment train with multiple bags with different filter media for different constituents. The flow can be continuous with tens of gallons per minute flowing both into and out of the end into the storm drain. Dewatering is a continuous process, not something you do and stop, at least until waterproof foundation is poured.
I was a project manager on a site that used them, if I recall correctly mine (actually the one that I’m familiar with) had a filter material on one end and the one I worked with contained quite a bit of sediment. My question is how do they empty the settlement? Is there a zipper on one end? 🤪
Yes. Its probably part of a water main bypass.
Yeah, it’s not damming anything. Still no definitive rational answer in this thread. At least nothing answering the question”why?”, just the “what?”. Guess I’ll repost over at r/whyisit.
They did this at my golf course when we needed to dredge the pond and remove the fine silt that had accumulated over time. They pump the muddy water into this bag and let it dry out over the summer. Then after it’s all dry, they cut open the bag and shovel the dry silt into a truck and take it away. The alternative is you just pump the silty/muddy water out and let it go but in dense areas or if you’re near a environmental critical area like we were (stream) the fine silt will cause damage.
My lake community used this method to dredge a shallow cove that had been filling in over the decades. When it’s all done the compost inside it is insanely rich…the gardeners in the neighborhood got to take some and were so excited.
This sounds like peritoneal dialysis for a section of earth.
Thanks! That makes sense. I was wondering how they’d get the silt out. Sounds like the bag is considered one-time-use?
I think so but not positive. I guess there could be some sort of zipper to open it up.
Here is a smaller one: https://www.zoro.com/pactec-dewatering-bag-6x6-8-oz-sb66-8/i/G008383577/
It’s a geotextile bag for dewatering dredged sediments from the pond. It seeps water over time, then they will cut it open and haul the material away.
OK, I've read this description several times in the thread. Let me see if I have this right:
Someone is dredging sediment from the bottom of a pond. This sediment is saturated with water, or is a slurry, and they want to have a drier material to use or dispose of.
Sediment slurry is pumped into this big bag, and the bag is permeable to water. It is sitting on top of soil. Water weeps out of the bag and is absorbed by the soil underneath, while the sediment solids are retained in the bag.
After months, the water is largely gone from the bag, and it can be opened to scoop out the relatively dry sediment that remains, which can be used for other things.
Am I getting the idea right?
I’ve heard it called surcharging in commercial development.
Surcharging is placing weight over a site to speed up soil settlement, so when you build your structure, the soil is already settled and the structure doesn't sink.
Dewatering is removing water from an area of soil to accommodate excavation.
If it's been sitting there for months with no activity like OP has said, it is probably meant for surcharging as the sediment would have dewatered by now. Placing a giant bag of water for two months would be a pretty easy way to surcharge the property without bringing any heavy equipment in.
Maybe they are using water from dewatering to surcharge this property, but surcharging and dewatering are not the same thing. That's all I'm saying.
True. I had no problem with the facts of your comment explaining the two things.
I just doubt they are dewatering anything if they filled the bag two months ago as any excavation would refill overnight and there isn't an excavation visible and there isn't evidence of a pond to pump muck from (because you can't load these with an excavator).
Ive actually bid work that was going to use a dam like this. Basically, its a catch bag, fills up with creek water, swells into the side and silts itself in. Leaves the creek bed after to dry out so you can work on it. Ive seen that once in 10 years though. This, as you've stated is a dewatering bag. Most like a sump pump to drain a pond or some other such feature. Depending on how big the pond or body of water is, and noise ordinances in the area which might reduce pump sizes to have whisper pumps, and any regulations on discharge rates which again would reduce pump sizes, that will determine how long it might take. It does look fun to bounce on though!
Correct answer! We used them for removing ash from settlement ponds. Had a floating dredge remover 90% of the ash & the rest we removed using these bags. We had about a dozen going at one time. Pump water with sediment into bag, sediment staying in bag, water returns to pond by gravity.
Have used them before. We called them biobags.
Hey neighbors! My husband and I were wondering about this too.
Call your planning and permitting office and ask them if this is permitted and if so what is it for.
Could it also serve to compact the ground while removing the extra moisture?
Go ask them
Video of how it works:
https://youtu.be/IHIG5_K2tQg?si=G8VFDTCMMTk4sxZc
Could be waiting on permits, which could take months.
Allows water to leave the jobsite without silt loss. Any soil that has been hauled on site that drains from a state job must be recovered. State environmental monitors this weekly and after any rain event.
This man knows his S.W.P.P
S.W.P.P.P.
Hey, you know me…
You down with S.W.P.P.?
(Yeah, you know me)
For the ladies, S.W.P.P means something gifted...
S.W.P.P.P., how can i explain it? I'll take it frame-by-frame it
Sorry bout that was just playing my game and wondering if I forgot a P! Thank you for the edit
I’m gonna need a diagram.
Sometimes bags similar to these are used in sediment dredging also. Bag retains the solids and is ultimately disposed.
We would use them in dewatering in construction. If we have to pump out an excavated pit, we pump the water into a dirt bag, and just like you described, the water flows out but the bag retains the soil.
Do you ever see the bag empty or flat? Really fine silt/sediment will plug a filter bag up and can potentially rupture, resulting in that slurry going in places you most definitely don’t want it to go.
This is it. A geotube. You pump water with solids in it, let it sit, the water percolates through, so you can haul it dry to the landfill. Source: I am an Environmental Engineer
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I can actually add context to this. This is a bag for environmental dredging. They likely pumped excess sediment from the damn area in this back. You can see the inlet pipe above. Sediment and water go in, only water run out. They'll be back to clean the bag up and collect the dried material in dump trucks eventually. I used to do this for work, so there you go!
Dewater bag
It compacts the ground over a period of months preparing it for digging and laying a foundation.
In South Florida there are company’s that own dirt and rent it out by the ton and time to contractors compacting a piece of land to build.
It's an aqua dam. Used for water storage/ water deflecting. There are some cool pics on their website if people using them in flood plains to save their homes. Most people I know use them to store water for weed crops
It is a big bag full of water used to surcharge the existing soil to increase the bearing weight of the soil. It is often done with dirt, but you need trucks and machines to move the dirt.
Wouldn’t that be cool If it were far up north and they cut it open after it froze. A really dangerous skating rink! lol
Those can also be used for water storage
Pretty sure it's your mom's waterbed.
That is a sediment dewatering bag for hydraulic dredging. You pump sediment from the lake bottom into the bag and allow the water to filter out clean and clear, relatively speaking. Trucking wet sediment is extremely expensive.
If it were a hydro dam it wouldn't be so wide, it would be taller and narrower. Also, what the hell would that be protecting, water would get around it.
This is the answer. I’m an engineer and have specified many vacuum dredge projects. This is a dewatering bag, likely on a lake with known non-hazardous contaminated lake bottom soils that need to go to a Class II landfill. Most landfills have moisture limits for soil disposal and, depending on weather conditions, in can take many months for the dewatering bag soils to dry enough for transport to the landfill.
are these the “greywater” bladders i have seen for sale in my search to find a (unique) solution for diverting rainwater temporarily? I didn’t know what they were used for. I’m looking at a 2000 gallon bladder that can withstand being rolled up when not in use and stand up to uv rays.
No, different thing. The dewatering bags are made of geotextile fabrics that keep the soil inside but allow water to drain through the fabric.
It’s new to me. Are you saying they are meant to be disposed of after (one?) use?
Yes, they are cut open for the dry soil to be loaded into trucks.
They did this in my hood, all the bags are going into their second winter. Contract fell through with the people who were supposed to remove it.
This is the more complete answer.
Can confirm. (certified Environmental Consultant here)
It's required for dewatering construction sites to prevent sediment from entering streams and watererways.
Specifically in response to the EPA constitution general permit which was drafted in response to the Clean Water Act of the early 70s.
example here
Maybe a dewatering bag. Can trap sediment from water.
I think it's this
I think you found it. 🎯
This is the answer. I worked in excavation. When you pump dirty water out (pond, storm sewer, water reservoirs) this filters the debris to keep from dirty water re-entering the storm drain.
This is the answer
I worked at a sewer utility where we used bags like this at a treatment plant. We pumped partially treated sewage in through the hose in the top. The water would slowly drain out through the sides. The water was captured and returned to the beginning of the treatment process. When the remaining sludge in the bag is dry, the bag is cut open and machines scoop it into dump trucks and haul it to the landfill.
In this case, they probably pump dirty ground water out of holes they dig for new houses, then, once the water has drained and the dirt is dry, they’ll probably use the dirt on site.
Is this near a construction site? Oftentimes dewatering bags are required to filter sediment when pumping water out of a possibly contaminated construction site.
I double dog dare you to jump on it
I triple dog dare you to put your tongue on it.
Stuck? Stuck! Stuck!
It might be a sludge dryer. We had those in our housing development. Over the decades, our drainage ponds were slowly filling in. They pumped the sludge off the bottoms but it’s logistically difficult to move that away easily. So, they put them in giant retainers like this one for a month or two.
Slowly, what’s inside it dehydrates. Eventually, they split it open, let it dry a bit more, and then collect the dried up sludge and move it to its final resting place - wherever that may be.
That looks like a geobag that they are using to dredge. They pick up the sediment and other solids with a diver or dredge barge and pump it into one of these bags. The bad collect the solids and the fairly clean liquid portion is allowed to return to the body of water. I have had these used on a wastewater treatment basin to remove sludge, we ponded up the water with a plastic containment and pumped it back into the wastewater system.
It’s to filter out the silt and let clean water out. YOURE not supposed let silting muddy water into creeks and such. Environmental folks will fine the hell out of you. Probably need to get rid of excess water but it’s too muddy to let it into the storm system so they are cleaning in to let fresh water into the storm.
They are removing silt from the body of water. Basically suck up fine silt and water into that big bag. The bag is basically fabric so the water can sweep out and flow back into the lake/pond. Any ultra fine silt that comes out with the water should be caught by the construction silt fence they have around the bag.
in my line of work it was called a silt sac. The water gets pumped into it and the silt and fines remain inside and the water drains slowly out "if this is the item I think it is". The bigger issue is the removal of the item when the job is complete all the silt and fines are inside and heavy af.
chances are, they dredged something - a pond or whatever. they put the output in these bags then leave them for quite a while - a year. at the end, all of the water is gone, and they strip of the bag. you have good dirt.... lookup hydraulic dredging and dewatering with geo-bags
They used something like this when they dug out spoil from a canal near near. Over the years debris filled up a pond. This arrangement was setup with a vacuum that sucked mud out of the pond. The water drained back into the pond the dried mud was later trucked away.
dredge bag, big vacuum sucks up muck/sediment from bottom of lake and puts it into bag, bag is like a big filter, holding solids and allows liquid to flow back into lake so muck eventually dries down into dry muck and that shit makes great soil amender. Used in waste water treatment final settling/clarifier basins all the time and for small lakes/ponds to remove top soil that washed in.
Its not a portable dam, although they can be used as them for E-dike repair and the like, but they are slow to fill so limited use cases To strengthen/build up a weak area, not an area that blew through the dike already.
I saw this on Dirty Jobs! They are dredging the area in front of the lot; the "bag" is there to contain the solids and slowly drain out the liquids much like an above-ground septic tank, then the remaining dry solids can be picked up later in the bag.
This is a sediment bag, water is pumped out of a construction zone and into this bag, this bag works as a filter to filter out any sediment before it drains back out into a water source downstream. -someone who has worked with these bags many times.
1 of 2 things: 1. Preloading of soils where a foundation will be. Testing the load capacity with a known volume of water (weight)
It looks exactly like a pool bladder, I use them when I fix swimming pools, pump the water into it, then we can reuse the water back in the pool (it can be more than 1500$ to fill them). However, 2 months is way too long for that
It’s a water bladder. I’ve used them on emergency response clean ups. Your water lines or damages or your source has contamination. It’s just a way to hold a lot of water temporarily when the main supply is not accessible.
It basically a big filter. Dirty water pumped out of a work area gets sent through the sac to catch debris and silt. Containing silt protects near by waterways, lowlands, and city water control like curb and storm drains.
Pure guess but was any dredging happening in the water? Looks to be a bag they pump the material into that allows the water to drain back to the lake. It should sit for a while until it dries as it is heavy when wet.
Is a sediment bag, they are probably working close to a river or creek, so they are disturbing the river bed so they pumping water there to pretty much filter it before going back to the water source
My guess is a weight to keep a finished basement from heaving in a high water table area (lakefront). The weight of the house above will keep the basement "submerged" after the house is built.
It’s a silt bag. Water being pumped on a construction site has to be filtered through a cloth bag No cloudy water can be released downstream or job site can be fined heavily and shut down
It’s a dewatering water quality bag. Usually a requirement for construction to use some sort of mechanism to ensure contaminants from construction don’t enter the local waterways.
It’s a silt bag… essentially a giant filter. Pump dirty water in and clean water comes out. It’s to avoid your cities sanitatiary system from filling up with tons of „mud“
It could just be for storing water, they also make them that separate water from sediment. So it basically allow the water to leave and retain the dirty settlement for removal.
Reminds me of an army blivet, used for water storage. Typically they pump one full of untreated water, then send it through a filter system into a clean/potable water blivet.
Is it near a body of water? Looks like a “bladder” used when dredging. This gets filled up with sediment. The contents dry inside the bladder before they transport it.
two months is a long time for this suggestion, but when my brother has his in ground pool liner replaced they pumped the pool water out into something very similar.
I just took down a portable pool here in California and the ground under it is like concrete so I believe it if they trying to surcharge the ground for a building.
Sediment filter bag. You run construction runoff through it, the water passes through but the filter strips the sediment out before releasing back into a stream.
Sediment bag. We use these sometimes to clean municipal tanks. If the sediment can’t be discharged on the ground it comes through here and the water seeps out
Did they recently dredge the water hole?
Pump out the sediment into the bag and let the water drain out.
No idea where you are, but op said waterfront.
That would keep the frost out of the ground although I have never seen it used for this purpose. I have heard of flood control using the same concept.
My educated guess, it's a water tank there to compress the earth so when the building is built, it wont settle as much.
Source: my MSCE degree.
it's a silt bag. I work at a lake and they pumped the silt into one of these and allowed the water to slowly drain away before removing the silt.
This was how jet fuel was stored At the airbase in DaNang during the Vietnam war. They were surrounded by a high wall of sandbags about 5 deep.
We used similar in food waste processing. The nutrient rich slurrey is pumped into the bag, water seeps out leaving behind a fertilizer cake
Looks like a large filter bag. When dewatering excavations they use these to discharge sediment free water rather than a bunch of mud
We had something like this used in our front yard when we had a new well dug. It was filled with dirt, clay, and gray slurry…
It looks like a Geotube. Retains solids and lets clean water seep out. They’ll eventually haul it off and bury it somewhere.
It's an alien sperm collection device. They're on every continent, now, but nobody's talking about it. What's up with that?
Looks like the bladder the pool company used to pump my parents pool out for repairs and then pumped it back into the pool.
Designed by Kramerica Industries, it's a rubber bladder for inside oil tankers so if they crash, the oil doesn't spill out.
Sediment bag. If you’re sucking out a pond you pump low into one of these and high out the other end like a septic tank.
I watched an old episode of Dirty Jobs recently where they used one of these to filter the water out of the sediment.
It’s a sediments bag. You discharge water off a site into bag its reclaims sediment before water goes to storm system
It’s to hold muck sucked out of the bottom of the waterfront. Muck stays in there until it dries and then removed
I saw them do this at a public park with soil that was dredged from a lake. My guess is it removes the sediment?
That's a lot of wasted plastic after they cut these open to let the silt dry. I sure hope they are recyclable.
From reading comments I could see the silt on the body of a lake or pond being collected for hauling away.
It’s a passive dredge that removes and stores the sediment while returning the water where it came from.
They use it when they dredge an area and pump the spoil and water into the bag an then let the water drain
There dewatering a shaft or trench, pumping it into to the bag to collect sediment. It’s a silt bag.
P Diddy didn't want the FBI to get DNA samples from his orgy waterbed, so he stashed it in your town
These are used to filter water during construction and clean up jobs with environmental concerns.
That looks like the 50K bags we used for potable water storage and distribution in the Army.
Its a filter bag, you pump dirty water in it traps sediment and cleaner water filters out.
Its a big filter bag to seperate out the water and silt they've pumped up from the bottom
Looks like they are de-watering dredge material so it can me more easily managed or used.
did they drill a new well? seen these used in my area for catching drilling spoils
Looks like they may be surcharging the land, before building. Must be a big house.
Oh look, an enormous dirt bag. Hello Mother Glad to see you're still wide & flat.
Water damn
It’s a dewater sediment bag.
Do you know how it functions?
Jump on it
Looks like a mobile water storage tank. Seen these used to store fuel too.
We used these to store water for bathroom use on deployed military bases
Looks like the bags we used in Saudi for potable water for the hospital.
I work on commercial planes. Looks like a slide life raft from a 777
It’s a silt bag. Water is pumped through, and silt is filtered out
It's basically a storage bag while they dredge a lake or a pond out
I used to have one. Great place to make out and watch the stars….
It's a water pillow tank, you can buy them as military surplus.
I suspect they are using it to compact the soil underneath it.
No it’s a dewater sediment bag.
This seems similar to what I have seen Water Purification use.
It’s a giant silt bag. Is there a pond nearby being dredged?
It looks like a sediment control bag, use them a lot in mining
Look up in the sky for a man shot with a canon any minute now
It looks like a bio methan bag. For making you’re own gas
Looks like a collapsible water tank.
https://preview.redd.it/vupm7cxld07g1.jpeg?width=1079&format=pjpg&auto=webp&s=b927a1a3e39112047e48ec034d43085ca7e82324
Soil stabilization. Compacting earth before construction
We all know it is the world’s largest whoopie cushion
I can smell that water when they finally empty that bag
Go pop it! You'll find out real quick what's inside.
Looks like what they use at water treatment plants
Maybe they are testing the bladder dam for leaks
It is a geo tube. Used to dewater dredge spoils.
They are called geo tubes for dewatering solids
The first time we were together was in December
The only reason why you should not have been able
I hope that is not one of those poop balloons.
Looks like a silt bag for pumped groundwater.
A big Capri Sun with the straw sticking out
Dirt bag. You pump the dirty water into it.
Would they happen to be doing any dredging?
sewage of some sort, sewage treatment
Not sure but I really gotta pee now.
From Dredging the canal on the lake.
It’s an inflatable coffee damn.
It. Might compress the soil too.
I dunno but I wanna jump on it
We called em water buffaloes.
Removing water from the soil.
This looks like a fuel blivet
It’s a big coffee filter.
It’s a massive silt bag
Above ground septic tank
"Jesse we need to cook"
it’s a water bladder, just on construction scale.
Haha. Howdy neighbor!
Holy crap, there are a lot of neighbors on this post.
Your mom's waterbed?
My mom's water-bed.
Dredging container
Water displacement
Huge gravity bong
Do NOT eat that.