Question 1

What does RCC Engineers consider when designing a stormwater system?

Accepted Answer

Stormwater design considers the contributing catchments, rainfall, site levels, impervious areas, drainage paths, nominated discharge point, detention or retention requirements, overland flow and relevant council or authority requirements. The drainage solution is developed specifically for the site rather than applying a standard layout.

Question 2

What is LPOD?

Accepted Answer

A Legal Point of Discharge (LPOD) is the approved location where stormwater from a property is permitted to discharge into the council drainage system. Depending on the site, this may be a kerb and channel, council pit, underground drain or other nominated connection point. RCC Engineers uses the LPOD information to design the site drainage, connection levels and any required detention or flow-control measures.

Question 3

What is the difference between OSD and retention?

Accepted Answer

On-site detention temporarily stores stormwater and releases it at a controlled rate to reduce peak discharge. Retention stores water for reuse, infiltration or other purposes and may reduce the volume discharged from the site. Some projects require a combination of both systems.

Question 4

Can RCC Engineers design drainage for sites with limited fall?

Accepted Answer

Yes. Where gravity drainage is constrained by site levels or the available discharge point, RCC Engineers can assess alternative arrangements such as adjusted grading, detention, pumped drainage or other engineered solutions subject to authority requirements.

Question 5

Can RCC Engineers design OSD and WSUD systems?

Accepted Answer

Yes. RCC Engineers can design OSD, retention and WSUD measures where required by the planning permit, council, authority or project brief and integrate them with the overall site drainage system.

Question 6

Can RCC Engineers assist with subdivision civil design?

Accepted Answer

Yes. RCC Engineers can provide drainage, roads, access, site grading and associated civil engineering documentation for residential, commercial and multi-lot subdivisions, subject to the relevant authority and project requirements.

Question 7

Can RCC Engineers respond to council engineering comments or RFIs?

Accepted Answer

Yes. Where engaged for the project, RCC Engineers can review council or authority engineering comments, provide technical responses and revise the design and documentation where required.

Question 8

Can RCC Engineers assess drainage problems on an existing property?

Accepted Answer

Yes. RCC Engineers can investigate existing stormwater and surface-drainage issues, assess likely contributing factors and provide recommendations or remedial drainage design where appropriate.

Water Sensitive Urban Design (WSUD)