Drainage issue

Probably. In heavy rain does water bubble up through the downpipe connection to the storm water? If so it is a blocked drain. If it comes from elsewhere on the property and this area is a low point then it will be some other solution

Find the stormwater drain, could be clogged but you’d probably need to get someone out to check it. Mine had a taproot growing through it and eventually it backed up completely. If there’s no drainage then it might be a DIY backyard project that didn’t take into account that it rains.

Consider putting in a strip drain along the house. or a yard drain in the general area where it pools

My yard has an absurd amount of drains in it, but I have no regrets. Water is the #1 enemy for homes, and you’ve got a stormwater pipe readily available at that location

edit: Get a garden hose and send a heap of water straight down the downpipe . If it backs up/overflows then you know that the dowenpipe is the problem. If it drains fine then surface water is the problem

Id rethink the whole area – maybe even dig out that area where the pot is as a lower point, install a drain so it all flows away from the house to that point, small retaining wall against the pavers/concrete on the left if needed, replace the dirt/gravel with more stones so it drains well.

Looks like plastic with no drainage

The water in the weepholes is not a problem now. The alab level which will hqve the timber frame aitting on it is a good brick height (86mm and grout) above the top of the weephole.

When the rain has eventually subsided the best solution will,be to takw,advantage of the down pipe location and use the connection tomcreate a drainage pit.

Firslth you need to establiah your levels. dig out all the material around the house for at least 300mm width ( 600mm better) with minimum 70mm below the weep holes, 100mm is even better. You do not have to grade this to the downpipe connection. This ismspecificalky to determine the absolute top height of the pit.

Dig around the ground connection and find the outlet downpipe.

If there is enough height on the bend you can simply cut the pipe to level and add a grated collar. Add a shaped apron collar around it with 2 bags og concrete mix. Add 20mm river stones minimum 50mm deep in the newly excavated area leaving an air gap to weep holes. Plant a a few native grasses and scatter a few larger river stones to make it look like a natural water coursd. This will act as a swal in future high water events. Water will permate through the air gapsbetween the stones and allow thr water to drain into the pit.

If the geometry is not correct for a grated collar you will need to add a proprietary put with a grated lid. It does not matter if the pit bottom is much lower than the outlet pipe. If the buried pipe is too high you may have to relay.

There is also an option of building a soakaway which is essentially a cube filled. with rocks if youmcannot,get any pipe falls to work. In that case leave the downpipe as it is and simply create a french drain from the effected area to the soakaway.

Good luck.

This is probably an issue for the International Drainage Commission in Springfield.

Looks good, Maybe plant some Wasabe.