Northern Beaches Council · Dual occupancy ·

Council's charts called for more detention than the site could hold. Site-specific DRAINS modelling cut the required volume by 30%. Approved.

Willoughby City Council · Industrial ·

Tight headroom, discharge and water quality targets unmet, and a matter heading to conciliation. A custom two-chamber tank and expert evidence settled it. Approved.

Northern Beaches Council · Subdivision

Four lots all needing gravity drainage, almost no room for detention, and the neighbour's kerb sitting on private land. Approved.

Ku-ring-gai Ku-ring-gai Council · Commercial

A heritage cottage, a partially low-lying site and almost no headroom for a tank. The answer was two drainage systems rather than one. Approved.

Singleton Council · Industrial ·

Water quality treatment and on-site detention delivered without a single tank. The parking area does the storing.

Approved.

Lake Macquarie City Council · Multi-Dwelling

Council required a road widening but wouldn't say how far it extended — and part of the existing road sat on private land. Approved.

Central Coast Council · Commercial

Ten parking spaces on a site that barely fits them — and grades steep enough to drain without vehicles bottoming out on the way in. Approved.

Ku-ring-gai Council · Alterations & additions

A regional road frontage demands a turning bay. A narrow site leaves nowhere to put one. B85 modelling found the smallest that worked. Approved.

Inner West Council · Change of use

Wall-to-wall boundaries with nowhere to run pipes, a basement surrounded by floodwater, and a driveway that had to become a footpath. Approved.

Inner West Council · New Dwelling

Council's pre-DA advice would have cut the floor plan back for an open flow channel. We argued it down, then swapped the OSD for a rainwater tank. Approved

City of Sydney · New Dwelling

No council or BASIX requirement, so the tank size was the client's call. We modelled a year of wet and dry days to get it right. Approved.