
What a river level reading means
The number on a river gauge, what the metres mean and why a river can drop in a day. Builds on “Where a glass of water comes from”.

November 3, 2026 · 12 min
How a stone canal feeds a valley, how fast the water moves and how much goes by in a day. Builds on “How a village tank is shared out”.
A short letter every Sunday: one piece of water news explained, with the numbers made small.

The number on a river gauge, what the metres mean and why a river can drop in a day. Builds on “Where a glass of water comes from”.

What the line on the wall of a reservoir tells you, and why half full can mean very different things in a dry year.