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| Why does Ladybower Reservoir in Derbyshire have plug holes? | Why does Ladybower Reservoir in Derbyshire have plug holes? |
| (about 13 hours later) | |
| Two fishermen caused a stir earlier this week when they were filmed sailing perilously close to a giant "plug hole" at Ladybower Reservoir in Derbyshire. | Two fishermen caused a stir earlier this week when they were filmed sailing perilously close to a giant "plug hole" at Ladybower Reservoir in Derbyshire. |
| Severn Trent Water, which owns the reservoir, said the pair had put themselves in a serious danger and warned others not to copy them. | Severn Trent Water, which owns the reservoir, said the pair had put themselves in a serious danger and warned others not to copy them. |
| Ladybower Reservoir has two of these dramatic-looking "plug holes" but exactly what do they do? | Ladybower Reservoir has two of these dramatic-looking "plug holes" but exactly what do they do? |
| They are not magical portals | They are not magical portals |
| One wag on social media joked the plug holes provided a direct route to Australia while another person said they were told as a child there was a giant mincing machine at the bottom. | One wag on social media joked the plug holes provided a direct route to Australia while another person said they were told as a child there was a giant mincing machine at the bottom. |
| Inevitably the truth is more mundane. | Inevitably the truth is more mundane. |
| Technically known as shaft spillways but affectionately known as plug holes, the drains were designed to regulate water levels in the reservoir by letting out water when the reservoir became full after prolonged wet spells. | Technically known as shaft spillways but affectionately known as plug holes, the drains were designed to regulate water levels in the reservoir by letting out water when the reservoir became full after prolonged wet spells. |
| The water is carried away down tunnels through the dam to the River Derwent downstream. | The water is carried away down tunnels through the dam to the River Derwent downstream. |
| Each plug hole has a diameter of 24m (78ft) and the drop from the exit point to the floor of the tunnel below is 20m (66ft). | Each plug hole has a diameter of 24m (78ft) and the drop from the exit point to the floor of the tunnel below is 20m (66ft). |
| These shaft spillways have been nicknamed bellmouth or morning glory - after the flower - spillways. | These shaft spillways have been nicknamed bellmouth or morning glory - after the flower - spillways. |
| Importantly, they look pretty cool too. | Importantly, they look pretty cool too. |
| What would happen if you fell in? | What would happen if you fell in? |
| Following the water down the hole would not end well, according to Severn Trent Water. | Following the water down the hole would not end well, according to Severn Trent Water. |
| "If somebody fell in, they would very seriously hurt themselves," a spokeswoman said. | "If somebody fell in, they would very seriously hurt themselves," a spokeswoman said. |
| "They would also find themselves stuck because access to the river has a grille so they would need a professional rescue team to get them out." | |
| Do they do anything else? | Do they do anything else? |
| Good question. These plug holes aren't just about getting rid of excess water - they also create energy. | Good question. These plug holes aren't just about getting rid of excess water - they also create energy. |
| As the water plummets down the overflows they pass through 250 kilowatt hydro turbines to generate renewable energy. | As the water plummets down the overflows they pass through 250 kilowatt hydro turbines to generate renewable energy. |
| Severn Trent said this provided a significant supply of power to use in its water and sewage treatment works. | Severn Trent said this provided a significant supply of power to use in its water and sewage treatment works. |
| Could we see a photo looking up from inside the plug hole? | Could we see a photo looking up from inside the plug hole? |
| Absolutely, Here you go. | Absolutely, Here you go. |
| Do other reservoirs have plug holes? | Do other reservoirs have plug holes? |
| Yes they do - but not many. Next time you're enjoying a visit to the Brecon Beacons in Wales, look out for one at Llyn Pontsticill Reservoir. | Yes they do - but not many. Next time you're enjoying a visit to the Brecon Beacons in Wales, look out for one at Llyn Pontsticill Reservoir. |
| You'll find another near the Monticello Dam in Lake Berryessa, Napa County, California. Its nickname is "The Glory Hole" if you need to ask a local for directions. | You'll find another near the Monticello Dam in Lake Berryessa, Napa County, California. Its nickname is "The Glory Hole" if you need to ask a local for directions. |
| How do other reservoirs get rid of excess water? | How do other reservoirs get rid of excess water? |
| A more common sight than shaft spillways are overflow spillways, which carry water down part or all of the dam. | A more common sight than shaft spillways are overflow spillways, which carry water down part or all of the dam. |
| It was damage to the spillway at Toddbrook Reservoir in Whaley Bridge, Derbyshire, that saw more than 1,500 residents ordered to leave their homes over fears the dam would collapse and flood the town. | It was damage to the spillway at Toddbrook Reservoir in Whaley Bridge, Derbyshire, that saw more than 1,500 residents ordered to leave their homes over fears the dam would collapse and flood the town. |
| Other reservoirs employ side channel spillways, which as the name suggests channel the water away from the side of the dam, or outlet towers, which mechanically pump water from the reservoir. | Other reservoirs employ side channel spillways, which as the name suggests channel the water away from the side of the dam, or outlet towers, which mechanically pump water from the reservoir. |
| You'll find one of these at Rutland Water along with a limnological tower - used to study aquatic ecosystems within the reservoir. | You'll find one of these at Rutland Water along with a limnological tower - used to study aquatic ecosystems within the reservoir. |
| Follow BBC East Midlands on Facebook, Twitter, or Instagram. Send your story ideas to eastmidsnews@bbc.co.uk. | Follow BBC East Midlands on Facebook, Twitter, or Instagram. Send your story ideas to eastmidsnews@bbc.co.uk. |