Small issue with my neighbour…

Omg this! You're hosing chicken shit into her garden. Wtaf

Are you sure you're permitted to keep poultry where you live? Have you checked the covenants etc? As a chicken-keeper too, I'm very wary causing any issues around them (we're permitted but I don't want to open that can of worms). Personally, I think she's being precious about her path...

Dig a trench along your side of the boundary and fill it with shingle. This will act as a soakaway so it won't happen again.

actually have never seen the front of their house and am not sure where it is
I'm mystified by this, how can you not figure this out?

Cement a piece of concrete like an edging strip at the point where the water runs down into her garden, to stop it doing so.

Livelifebehappy
You seem to have the same entitled view as OP about the insignicance of water coming from her property onto a neighbour's. It may be just water to you, but it is an intrusion that a neighbour does not have to put up with.
The piece of official advice shown upthread says that water that flows naturally from a higher garden to a lower one is OK, giving the example of rainwater. But hosing down does not come into the 'natural' category as its source is deliberate. With you and your car washing it was careless and insensitive to your neighbour's feelings. With OP it is refusal to see the nuisance and upset she is unneccesarily causing the neighbour because of something she wants to do, as that is all that seems to matter.

Can you put some kind of raised edging along the border of the fence and patio, it needs to be just 2cm high, easy to do with a bit of mortar or aluminum trim screwed to the patio edge, so that the water is directed into your garden.

My old neighbours getting chickens was the final nail for us moving. He didn't clean them very well and chickens often encourage rats to the area, which his did.

The smell was awful, we wouldn't have cared about water coming in the garden if it meant he was actually cleaning them up. RSPCA didn't care at all about the welfare of these chickens.

She should be grateful she is living behind a considerate person who actually looks after their animals properly and keeps their garden clean and smell free.

Look this up on Amazon: Quick Dam QD610-1 Water-Activated Flood Barrier-1 Pack, Black, 10-ft

Yes it rains and yes, her path would get wet with the rain, but that's a natural occurring situation and completely different to OP using the neighbours garden as a soakaway for her hose water, even ignoring the dirty water angle.
There's a vast difference between rain and deliberately wetting someone else's garden on a weekly basis.
Your neighbour didn't choose to have chickens of her own so she shouldn't be inconvenienced by yours.
Utterly selfish, and I can only imagine the amount of water over her garden when you powerwash your patio, albeit once a year.
I agree with @OrderOfTheKookaburra that temporary fencing and moving them around the lawn is the best idea.

I'd be cross with you to OP. Chicken poo smells vile

🤣🤣🤣 does she come out and shout at the rain clouds when they get her path wet too?! Don’t give her eggs and don’t apologise, she’s nuts!

My NDN kept chickens for years and we had no issues. Their NDN now does and so does another neighbour a three doors down to us. Other than hearing the sounds they make now and again we wouldn't know they were even there.

I'm fascinated by the fact that your bantams don't hover around your door. My chickens see my I think if they loiter with ill intent I'll cave and give them some treats. As a result I end up with so much chicken poo right outside my door it's horrid. I do have some fairly big chickens though.

I instead rejigged their accommodation and stopped them roaming all over the garden. They do have a decent amount of space though, I don't like the idea of them being limited to a tiny area. But my veggie patch kept getting decimated as they kept breaking into the netted raised garden beds so I had to do something.

FYI - you can get temporary fencing that will keep them penned into different areas of your garden which can be easily moved around. I'll do that eventually and let them roam the lawn and potted plants area occasionally but keep them out of the veggie patch.

This wouldn't bother me as a neighbour if it really happens as you describe. I have neighbours with chickens and I love hearing their noises and any eggs are a bonus too. We are all level though so no water run off.

I hope you can find a solution by either blocking the water or some sort of drainage solution so it doesn't end up next door. I don't think you are being unreasonable, but it clearly annoys them so if you can reduce your run off then I'm sure it would beneficial to the neighbourly relationships

Wash when it's raining. Then her garden is already wet.

Leave the eggs without a note; she'll know what they're for.

But absolutely fine for four bantams!

It's not small at all.

OP, love your garden. The level of pretension on here is high. You can certainly tell who are the shoes off lot.

She might have just been having a bad day. I'd do the eggs over the fence with a note just saying 'sorry about the water coming over'
She'll probably feel silly. If it happens again, just explain that it is just water. Everyone outraged saying its poo water! How do they manage to stop birds shitting in their garden?

Neighbour goes in garden to get something and ends up with wet feet from you washing your path again. Yep. That would properly annoy me too.

You could use metal edging from a garden centre to seal the small gap but surely the same thing happens when it rains if your garden is higher than hers ?

French drain or soakaway, cheap to do and will massively help the problem.

I would love to keep chickens, but I essentially lazy and would find all the hygiene work too much. Would love a neighbour with chilckens though.

Fellow pet hen keeper here! Why don't you just stop your chooks (they are lovely, by the way) going on to your patio by putting temporary fencing round it? You can buy green netting and movable pole supports which are not obtrusive or expensive and which are easily moved if necessary. Would that not sort out the problem as the patio wouldn't then need hosed down? I love my chooks but they don't get to free-range onto my patio as they are messy little blighters!

Just wash it down when it’s already pouring down with rain, then she won’t be complaining about you making her path wet, it already will be.

You need to redesign the area so water doesn’t go on her land, or not allow chickens up there. Not ok to wash water onto her land.