Riverstone Building
Inspections

Water sitting where it should be leaving

A pit holding water and a condensate line on the ground.

Owner Inspections · Riverstone 2765 · 2026-02-23

In short: Two Riverstone findings about drainage, and why they belong together.

Ponding in a pit

A silt pit holding water after the rain has stopped means it is not draining. Either the outlet is blocked, the levels are wrong, or it was never connected as designed.

Condensate on the ground

An air conditioner discharging its condensate at ground level puts a slow, continuous trickle of water beside the slab through every warm month.

Why they matter together

Both put water where the design assumed dry ground. Reactive clay responds to moisture change by moving, and that movement is what a slab is engineered to resist, not to absorb indefinitely.

The flooding context

Riverstone saw serious flooding in 2021 along Marsden Road. Lot specific flood exposure is a council mapping question, but the smaller drainage questions around a house are ours.

What to do

Both are cheap corrections at handover. Clear or reconnect the pit; plumb the condensate to a legal discharge point.

Written by the Owner Inspections team from inspections carried out in Riverstone. Licensed building practitioners, NSW Fair Trading licence 366177C.

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FAQ

Questions Riverstone owners ask about this

Is a blocked pit the builder's problem?

At handover, yes. It is either construction debris or an installation fault, and both sit with the builder.

Where should condensate go?

To a legal discharge point as required by the plumbing standard, not onto the ground beside the footing.

Does this cause slab movement on its own?

It is a contributor rather than a cause. Persistent moisture beside a footing on reactive ground is a known risk factor.

Do you assess flood risk?

No. That is council flood mapping and a conveyancing search, and we say so rather than implying a competence we do not have.

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