Water Sensitive Urban Design (WSUD) report

This report outlines the Water Sensitive Urban Design Response to achieve the objectives of Clause for Stormwater Management (WSUD) Policy of your local council Planning Scheme. The following site plan shows the location of the catchment areas. The following table shows the proposed calculated Raingarden size and the Rainwater tank capacity in from of its catchment area.

 

This report calculates the required treatment measures size/capacity for compliance with the Clause. Architect and/or other relevant consultants will be responsible for implementing the treatment measures and showing the required information on the application drawings to be submitted to the Council.

STORM Calculator

Anyone can use the STORM calculator to design small residential or commercial developments, ensuring they achieve the stormwater treatment objectives required by state and local government planning provisions.

Access the STORM calculator

The following STORM rating report outlines how this application achieves the objectives of Storm water Management (Water Sensitive Urban Design) Policy of your council Planning Scheme. The achieved STORM rating should be minimum 100 to satisfies the benchmark 100 scores required.

The above rating demonstrates that the client has met the best practice stormwater quality for the proposed development using the WSUD measures described in the STORM report, and that if constructed in harmony with WSUD measures outlined in the WSUD report. 

Note: For the development to achieve the STORM score listed, it must be constructed according to the town planning drawings as well as the following specifications. The type, location and any necessary design details need to be shown on the planning drawings and submitted to the Responsible Authority to be endorsed. If consultants/engineers preparing the plans have any questions relating to the WSUD measures in this report, they should contact Geoflow Australia for further clarification.

Site management program

The builder and/or project manager will be responsible for providing a site management plan including stormwater management before and during construction. This may be incorporated within a broader Construction Management Plan.

Site maintenance program

Rainwater tanks

The project’s hydraulic/services engineers will be responsible for the design of the Rainwater tanks and rainwater reticulation, shall inform the building facility manager and/or owners corporation in writing, of the required maintenance tasks to keep the system operational. This includes:

  • Regular inspections of the tank(s), pump(s), reticulation system and toilets to ensure that the system is operating for toilet flushing as designed.
  • Periodic cleaning and major maintenance of the tank(s), pump(s) and reticulation system to ensure the long term viability of the system.
  • The building facility manager and/or owner’s corporation shall include on their building maintenance schedule the required maintenance tasks specified by the hydraulic/services engineers at the required intervals.

Appendix A provides a checklist for the future operational and maintenance arrangements for Rainwater tanks.

Raingardens

The project’s hydraulic/civil engineers will be responsible for the design of the Raingardens and the connection inlets and outlets to and from the Raingarden and shall inform the building facility manager and/or owners corporation in writing, of the required maintenance tasks to keep the system operational including:

  • Watering the Raingarden if it does not rain for a long period until plants have established compliance with local water restrictions,
  • Regular inspections of the Raingarden, level of gravel mulch covering the Raingarden, blockages in the overflow pipe, sediments in the downpipes, weeds and plant erosion in the Raingarden itself,
  • Distribution of the water flow into the Raingarden to limit erosion from heavy rainfall,
  • Ongoing protection from pedestrian and vehicular access,
  • Owner’s Corporation (OC) bylaws to prohibit the removal of all soil and plants within Raingarden, and an obligation on residents to report any maintenance concerns to the OC.

The building facility manager and/or owners corporation shall include on their building maintenance schedule the required maintenance tasks specified by the hydraulic/services engineers at the required intervals. Appendix B provides a checklist for the maintenance arrangements for Raingardens. 

Raingarden mistakes to avoid

A raingarden doesnt need to be 1m high! 

The ponding depth of 100mm or 300mm options in STORM report refer to the depth above the top of gravel mulch and below the grated cap. The following diagram of a raingarden has 100mm from the top of gravel mulch to the grated cap overflow drain.

Porous pavements

Porous pavement can be created with traditional masonry tiles that have a porous jointing material between the tiles.  The jointing material is often loose and not robust like typical grouting material – but it plays an important role in allowing the water to move through to the ground below.

A sample maintenance checklist or porous pavements is provided in figure below. Click to enlarge.

Reference information

Further information regarding the recommendations contained within this report may be found within the following documents, including examples of the design details of WSUD drainage features that may need to be specified by the landscape architect or civil engineer.

Feel free to contact Geoflow if any further information or clarification is required.

Assessor Qualifications

The WSUD modelling has been undertaken by Dr Amir Kivi, from Geoflow Australia. Amir has 9 years’ experience in NCC energy compliance modelling. In the following a summary of Amir’s qualifications are presented:

EDUCATION

  • 2015-2016: Certificate 4 in Building and Construction
  • 2015-2016: Certificate 4 in NatHERS (6-star building energy assessment)
  • 2011- 2015: PhD in energy systems, Infrastructural Engineering Department,University of Melbourne, Australia.
  • 2007- 2010: M.Sc. in Civil Engineering, Sharif University of Technology, Tehran, Iran.
  • 2003- 2007: B.Sc. in Civil Engineering, IKIU, Iran.

ROLE

  • Responsible for energy modelling and STORM modelling at Geoflow Australia; a Melbourne based sustainability consultancy specialized in environment-friendly energy solutions.   

SOFTWARE USED

  • Energy Modelling: TRNSYS, TRNBuild, FirstRate5, Carrier HAP, LEAD, LBNL WINDOW, TRNSHEL
  • Other: STORM, NREL System Advisor Model, AutoCAD, Revit