Llyn Clywedog Dam

[saleen 192]

Having their breakfast this morning

 

[saleen 192]

Didn't fancy going to the

iron works today went to dam and drove round the other side of dam .Wales now in drought warning you can see why from pictures. Just a very small stream of water now filling the dam which is low few people fishing on bank and in boat. You need fishing permit to fish in there for trout.

 

[renchero]

nice country side

 

[TransAmDan]

They could do with hiding water under ground, wonder how much a day is lost in evaporation?


Lets ask AI.....

1. Pick a typical summer evaporation rate​

For UK summer conditions (warm, sunny, reasonably dry), a ballpark open‑water evaporation rate is around:

• Typical rate: 3–5 mm/day

Let’s grab 4 mm/day as a mid‑range estimate.

Remember the key conversion:

• 1 mm of water over 1 m2=1 litre

So:

Daily loss (litres)=Evaporation (mm)×Surface area (m2)

2. Estimate the surface area of Llyn Clywedog​

Llyn Clywedog’s surface area is roughly on the order of a few square kilometres. Let’s work with a simple round figure:

• Assumed area: 2 km2=2,000,000 m2

You can swap this number later if you find a more precise figure.

3. Do the rough calculation​

Using 4 mm/day and 2,000,000 m2:

Daily loss (litres)=4 mm×2,000,000 m2
Since 1 mm×1 m2=1 L:

Daily loss=8,000,000 L/day
Convert to cubic metres:

8,000,000 L/day=8,000 m3/day
So a reasonable rough estimate is:

• ≈ 8,000 m³/day
• ≈ 8 million litres per day of water lost to evaporation in hot summer weather.

4. How to refine it if you want to nerd out​

If you want to tighten the estimate:

• Get the actual surface area of Llyn Clywedog (in m²).
• Use a local evaporation figure (mm/day) from a nearby weather or hydrology source.
• Plug into:

Daily loss (m3)=Evaporation (mm)×Area (m2)1000
Even with rough numbers, you’re in the right order of magnitude—millions of litres per day just from the sun and wind.

 

[saleen 192]

There will be water in the caves and mines Google Welsh caves or corris caves but bet they are getting low the ellan valley was much fuller they want to release water to help the river why valley as it's struggling with low water and pollution. Lake vynrie that also feed Liverpool wonder low that is all 3 have very large open spans evaporation is a good point to make with this heat.my river is very low one part is almost stagnant other part is a trickle Surprised to do many boats out there and people fishing .also not been down the that road for about 8 years went past the ospreys triwtchers hut and small car park I presume that is the spot you can watch the nesting from ?? That I have posted videos on... There is also a iron age mine there should of stopped there as bet that has dried up ????