Making a mark

After the rain last week there was a rust stain left on the drive, looks like rust being washed out but not sure where it is coming from. Only have the Camper a few weeks (our first) and didn't notice this before.
My mechanic expertise consists of watching lots of episodes of wheeler dealers, so not sure how worried I should be.

It's a 96 Ducato, should I rush out to the mechanics or is it ok for the season?

Leak from water pump maybe?

Rusty water is defo a water system leak.Flush out the whole system and put Bardhal water system leak sealer in system should cure it.

I'd go JJF direction before anything else. Check a couple of things.
Lift the bonnet look at water rad reservoirs and see if it is rusty coloured or cooling colour,follow the overflow pipe to see if it is aimed where you see the rusty water.
Get a watering can full and pour it slowly across the windscreen watch where it runs out to the ground ,or as JJF has advised is it spilling across the battery ,are the drain off holes for the windscreen blocked .
Show a few photos of the battery area

I have a 98 Ducato and the battery tray area had a lot of rust plus the parts below it were badly corroded. . I had the whole front taken off and welding done and had to get a new battery tray manufactured. In fairly short order the tray was rusting again despite being brand new and painted thoroughly. As other have said the rain gets in easily at the bottom of the windscreen. The only way I stopped it was to build a shelter for the Motorhome in end and the rain always seemed to get in. A good cover that would cover the windscreen and deflect the water well down the bonnet would be the next best thing.

Check for any drips under the dash at the right hand front seat side (mine is LHD) as my heater matrix dripped a little there but nothing externally. If it was a big coolant leak you would notice the coolant level very slow straight away.

Seems to be the issue alright, the water is pooling on the driver side (RHD) and if it is lower than the passenger side where there looks to be a drain, it is spilling over and dripping down onto the battery. When I lifted the handle of the battery it was full of water.
Luckily the battery tray seems to be ok, I'll have a look at the inner wing later but if the tray is ok hopefully the wing hasn't been damaged.
I took the rubber seal that runs along the bottom of the windscreen under the bonnet off, it was loose on this side, cleaned it out and refitted, and I've installed a leak detection system (empty curry tray on top of the battery ) and will check later.
I'll definitely go about adding the cover for the battery to direct water away, if you have any photos of what you did I'll go into MacGyver mode and do the same

I'll also keep a close eye on coolant level, I've taken photos of it now to compare in future.

Thanks!

I put a cheap plastic flexible fuel funnel where the water seems to drop down to the battery area. It just wedged between the battery and the body work and any rainwater that fell into it simply ran down the funnel and bypassed the battery and fell onto the ground below and do not hit any metal at all. You would stick a bit of hose in the end of the flexible funnel to make extra sure. I also used some black insulating tape and ran it along the bottom of the windscreen. I read that tip somewhere and the tape has held and is barely noticeable.

That was some amount of rain last night. The (non-metallic ) leak detection system overflowed

'Tis only a proof of concept

Just need to convince the boss we really need that 3D printer we've been thinking about