Water entering under my back door - how to seal?

Hi all
My back door is getting a bucketload of water coming under it in the rain. Water hits the door, runs down it and then hits the floorboards which extend out beyond the external door face, and water runs straight under the door !

I just bought a cheapo awning/canopy to install over the top to try and stop this, LINK but figure I should also try and seal under the door somehow aswell? Is that needed or should the awning block the water (it is a 1m protrusion). The direction is southerly so it does get a lot of wind+rain from that way.

Obv it will be a slight trip hazard but there's a big step there to outside anyway and would rather that than water puddles on my kitchen floor.

The current gap under the door is 5mm one side, 10mm another side. Door is 810mm. Should I be buying something like a raven RP112 ? Although they seem to cost $100+ :( The trouble is the floorboards extend 130mm beyond the door face externally, so need something long enough to not allow water to drop beyond the door sill and go underneath it?

I am not a very handy person so the easier option the better.

Photos here to show what I mean:

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thank you for your help!

You need something like this. The grooves between the floor boards will need to be filled where the seal hits the floor.

The real problem is the lack of a sill... and possibly lack of a drip line cut into the bottom of the door. However, looking at the pix, retrofitting a sill wouldn't be a simple matter. :(

Bohdan's solution will reduce the amount of water entering, but it won't fix it.

Couple one o' those seals with an awning you'll probably be able to live with it, but the bad news is that spot will always be a problem and prone to leakage.

if you're handy, you could change the door to externally hung (ie outward opening). But that opens up a whole new set of possible problems.
TM

The odds are against you with the floor running through to the exterior
You could get a metal flashing folded up to cover the external flooring with a small upturn under the door or there are a number of Raven seals available at the Green shed that will keep the majority of the water out , one being a hinged flap type fixed to the outside with a cam on the jamb or there is one that has a drop down seal triggered by the side of the door jamb or for a more concealed look yes u can insert a flap seal in the bottom rail and put a weatherbar on the floor for it to seal up to

Time to build a porch.

Hooroo.

As mentioned above, you need a sill. Or large undercover area. Either way, not a small/quick fix.

The first part of Beardy's reply is the correct solution. You can get checker plate aluminum, fold down thickness of flooring + 10mm, horizontal back under door and turn up 10mm (you will need to trim bottom of door 5mm clear of this upturn) run a saw between the bottom of each jamb stile to allow for this to slide under. Use Sikaflex Pro to fix tread plate to floor, allow 24hrs to cure and seal all junctions of the aluminum to the jamb stiles etc. Also use Sikaflex to seal the bottom of the door after you have trimmed it to suit. To avoid a trip hazard, fit a carpet edge trim over the upstand at the door then fit Raven RP303 to external face of doop