Crawford Court

Subdivision

Design Engineering (as Wilkie) was approached by the Shire of York to provide storm water drainage services for an 11 lot subdivision at Crawford Court, York, WA.

Design firstly had to undertake a geotech investigation to determine the soil classification and infiltration properties. Secondly, Design had to determine the surface water catchment areas and determine the impact of the proposed subdivision on the existing hydrology. Once the infiltration rate and soil classification were determined, Design then had the appropriate information to prepare a stormwater management plan. Thereafter, Design produced a Stormwater Management Plan which was submitted to the local council.

For further details on services provided on Major Projects by Design please contact the Design team on (+61 8) 9421 9080 or email us at info@designeng.com.au.


Project Brief

Outcome

  • Undertake soil classification testing
  • Calculate existing main road culvert peak flow volumes
  • Prepare stormwater drainage management strategy

Background

Design Engineering was approached by landowners to prepare a Stormwater Management Plan (SWMP) prior to subdivision. The SWMP was a planning condition requirement.

The purpose of the plan is to make individuals proposing to subdivide awareness of their responsibilities in relation to drainage. The document is owned by the Shire of York and is applicable to all landowners in the precinct. The drainage plan is a standalone document in the form of an instruction manual.

Project Objectives

The primary objectives were to identify the existing catchment areas to determine the subdivisions’ impact on the existing hydrological regime and determine if the existing Main Roads drainage infrastructure could cope with additional surface water without backing up and causing flooding to neighbouring properties and/or existing road infrastructure.

It was also important to determine the infiltration rate of the existing land to determine surface water retention requirements.

Challenges

To produce a SWMP that was compliant to Schedule 5 – Additional Requirements for the Residential Zone of the Shire of York Town Planning Scheme No. 2, prepared by the Department of Planning, Western Australia.

Our Approach

The team at Design Engineering firstly had to undertake a geotech investigation to determine the soil classification and infiltration properties. Secondly, Design had to determine the surface water catchment areas and determine the impact of the proposed subdivision on the existing hydrology. Once the infiltration rate and soil classification were determined, Design then had the appropriate information to prepare a SWMP.

Thereafter, Design produced a SWMP which was submitted to the local council.