I can't answer the question if the enquirer can't ask it correctly. 'Is' is the the third person singular of the present tense, 'reservoirs' is the plural of the noun, and cannot follow a singular verb.
There many more than three reservoirs in England.
wastwater
Brian Blessed
I am thinking about 10-15 metres deep. maybe. I am not that sure but hopefully or maybe!
In England we have reservoirs, which collect the rainfall. This then gets filtered etc and then we have our tap water.
Lake Willoughby, VT
Heddon valley, where the Hunter's Inn is situated. Is one of the deepest valleys in England. Any deeper and it would officially be a gorge.
The deepest mines and drill holes are found in the Earth's crust, which is the outermost layer of the Earth. These operations can extend several kilometers into the crust in order to extract minerals or reach deep oil reservoirs.
Lake morar in Scotland its the deepest at 310 metres deep
The deepest lake in the UK is Loch Morar, Lochaber, with a depth of 310 metres (1,017 ft), with Loch Ness second at 230 metres (754 ft). The deepest lake in England is Wastwater, Lake District, which has a depth of 76 metres (249 ft).
Do you mean Lake Ullswater in CUMBRIA, England? If so, the deepest parts of Lake Ullswater are 205ft deep.
Why do some states create reservoirs?