I have spared no expense or trouble to create this presentation on extreme rainfall events, flooding and the role of flood plains. Hopefully this will clear matters up.

This is an extreme rain event, some are so extreme they have a frequency of 1 a 100 years, or 200, but as with all rare events they can be clumped.
Technical term, a gurt load of water

This is the river channel which holds the average rainfall.

When a gurt load of water goes into the river it overflows and floods the floodplain.

Gravity is taking the water to the sea, when the tide is high in a period of springs river water discharge is reduced.

Now if the hills of the catchment has bogs, broadleaf woods, extensive or mob grazing then some water is held in bogs

Beavers, or people playing with sticks can help.

good grazing

Arable margins and under-sowing, careful cultivation

Woodland, not conifers with drains.

All of this helps, and also releases water in summer, helps aquifers recharge. Good stuff!

But a an extreme is EXTREME, beavers might drown.

When rocks like those get picked up it is scary for beavers and people.

much tain

Much erosion.

It ends up in towns built on rivers, because we need water so we live by it.

Good thing is a place exists for that gurt load of water, the flood plain, but we do things on it so hate it flooding, which is what it does, so we act like jerks when reality happens.

What we need is more of this.

But we can make things like a Wash

Or levels designed to flood

We do use big and small dredgers.

Sluices and managed drains.

What we can not do is make

fit into

Even with the big boy pumps from Holland.

The Dutch made a country from the sea, and drained our wet bits. They have wetlands as part of water management.

So although these have a role

This does not

Because we have to balance out cost, societies needs, environment, we have rules and plans.

https://www.riverluggidb.org.uk/media/1158/bap-2019-revision-approved-18th-april-2019.pdf