Brilliant and ingenious - nature based solutions are cheaper, more intelligent and easier to implement than hard concrete engineered solutions. We have no time to lose, to get back in relationship with Nature and work with her instead of against her. Well done Inishowen Rivers Trust!
Stupidest idea ever. Anyone with the slightest understanding of erosion will rapidly see that a high-water event will erode under and around the structure. If you want a structure to cause more soil erosion, this is it.
Grest concept and well done video. When I watched, the caption indicates the post is one year old. Do you have additional posts/updates between then and now?
Can't agree that it's a good design. While it sounds nice, the fact is that the water is going to eat out the channel even deeper as it's forced under the dam. If you're building a leaky dam, the best design is what beavers have been doing for a million years. They're the experts. The further from that design you get, the less efficient it will be. For as much time and effort goes into just one of those dams, you could have built three or four Beaver Dam Analogs.
Beaver dams store under normal flow conditions, these are designed only to be active under peak flow conditions. There is no extra storage in a beaver dam during flood events although they will certainly remove energy from the system. Have you a link to beaver building designs being implemented effectively by humans?
@@TheBuckybronco Oh, there's a ton of videos on RU-vid. Search "Beaver Dam Analogs" to find plenty, including talks that are an hour-plus, detailing projects that have been underway for years. This is a good vid with data on temps and whatnot.... ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-m2bG4kYfRhs.html While Beaver dams aren't designed to take in gobs of water, they do actually spread out the water, absorbing its energy and forcing it to flow widespread instead of down a narrow channel. If you look at the dam complex during "normal" flow, the dams rise above the water by a foot or more. That means they can absorb an inflow that's significant without breaching or being undermined. It's that ability to absorb the storm and spread it out which makes the difference. You get the same amount of water going out as you do coming in, but it exits at a slower velocity, over a longer timespan, because it's forced to spread wide and work its way through the flood plain. It doesn't always work, obviously. A lot depends on what kinds of structures are on the upstream side of things. Still, it's better than nothing. A good series of BDA's can make a tremendous difference in the health of the surrounding area because they create habitat and raise the underground water table. As you see in the video here, the water is rushed out just as fast as gravity can carry it. That's a drain in the very real sense, but we forget that it's draining the entire ecosystem. In the vid, you can see that they're already planning to force the water over the banks, making sure the heaviest rains spread out wide instead of simply shooting down the gutter they've made. Okay, BDA's do that very same thing. The difference is that BDA's serve a tremendous benefit in the times between the heavy rains. Between the storms, the small ponds create an incredible range of habitats and help rehydrate the surrounding land. When the storm hits, the BDA's are there to help slow the runoff and spread it over over the banks just like the Leaky Weirs. They both work to handle the storm surge, but it's what they do in between those surges that really sets them apart. And, to be fair, if nobody goes through those channels to clean out the sticks and leaves that tend to accumulate, the Leaky Weirs would likely backfill with all sorts of stuff that will slowly transform them to be more like a Beaver Dam Analog.
@@TheBuckybronco look up Beaver Dam Analogs in Idaho/ Utah. The leaky dam (called a post assisted log structure in NA) is perfect for this application. It takes much longer to build BDAs than PALS so I don't really know what the OP is on about.
Depending on the location some companies do use rocks but in this location there are none and it’s cheapest to use materials on site instead of spend money to get rocks and potentially destroy some of the environment trying to dump the rocks in these locations think logically
