A healthy waterways initiative in partnership between Melbourne Water and the Macedon Ranges Shire Council

Design, Construction & Maintenance of WSUD Macedon Ranges Shire Council

Water Sensitive Urban Design Guidelines Addendum Macedon Ranges Shire Council2

Council approved WSUD treatment types and Council requirements Table A–1: Summary of Council approved treatment types

Treatment Type Approved for Use Not Approved for Use

Bioretention swales Open space reserves within residential 1 zone, central median strips on collector roads (subject to road reserve width & services)

In nature strips unless as part of an overall design strategy incorporating concrete edge strips, entrance culverts & supporting treatments

Bioretention basins Nature strips, Drainage Reserves In unsuitable locations for access, permanent subsurface flow conditions, etc

Rain gardens Unit developments (body corporate responsibility) In unsuitable locations for access, permanent subsurface flow conditions, etc.

Vegetated swales/grass swales/buffer strips

Open space reserves within residential 1 zone, central median strips on collector roads (subject to road reserve width & services)

In nature strips unless as part of an overall design strategy incorporating concrete edge strips, entrance culverts & supporting treatments, including measures to prevent access by vehicles

Sand filters/Treatment Plants Not Approved

Sedimentation basins As part of wetland system or as a temporary measure as part of the construction phase plan

Not suited to steep land or as a permanent treatment not part of a maintenance regime to ensure regular removal of silt and debris etc

Constructed wetlands As part of an overall WSUD design strategy that details an acceptable maintenance regime

Not suited to steep land

Ponds and shallow lake systems

As part of an overall WSUD design strategy that details an acceptable maintenance regime

Not suited to steep land

Rainwater tanks For WSUD use only Not to be included in detention volumes for compliance with detention back to predevelopment

Gross Pollutant traps Acceptable only in a WSUD train if topography prevents alternative treatment

If location prevents vehicular access for maintenance.

Storm Water Re-use Supplied to EPA standard with reticulation system maintained by the Water Authority including switch to mains water if dual pipe supply unavailable

Treatment for additional nutrient and salinity load included in design modelling including urban storm water discharges to wetlands from properties and catchments

S 173 requirement for purchasers to include and maintain on site systems for future development in accordance with Plumbing Regulations and design modelling

Non-compliant with Water Authority, EPA & Melbourne Water requirements.

Design modelling results in a potentially inappropriate increase in nutrient and/or salinity loads to water bodies or build-up in soils (via direct inputs by watering practices, pipe bursts etc.)

Water Sensitive Urban Design Guidelines Addendum Macedon Ranges Shire Council3

Planning WSUD

Point of contact for WSUD planning referral

Applicants are to contact the Manager Major Projects & Developments or his delegate in relation to design standards and matters relating to Macedon Ranges Shire Council Guidelines.

Key groups for WSUD planning

The following areas within Council are to be consulted in relation to the WSUD treatment proposed:

• Conservation planner

• Statutory Strategic Planner

• Coordinator Developments

• Manager Parks & Gardens

• Manager Operations

• Manager recreation for proposal within open space and Council reserves.

Issues that the applicant shall have considered prior to approaching the above include but are not limited to:

• Conservation Planner – impact on existing vegetation, proposed management of existing vegetation.

• Statutory Strategic Planner – Consistent with Council policies and strategies, design issues, porous pavements etc.

• Coordinator Developments – Engineering matters, demonstration that proposed solutions have sufficient spatial allowance in open space (cross sections), easements and road reserves, Design standards to be adopted etc.

• Manager Parks & Gardens – proposed vegetation, maintenance access and safety,

• Manager Operations – Required maintenance intervals, methodology of maintenance.

• Manager Recreation – impact on existing assets, safety for users of the open space.

Drainage Authority The Southern region of the Macedon Ranges Shire Council area sits within the Melbourne Water drainage boundary (Figure A-1). The map shows the Port Phillip and Westernport Catchment Management Authority boundary that is also the Melbourne Water boundary. Within this area, the relevant drainage authority is Melbourne Water for catchments greater than 60ha and the Macedon Rangers Shire Council for catchments less than 60ha.

For all areas north of this boundary, Macedon Ranges Shire Council is the relevant drainage authority. For works on waterways the North Central Catchment Management Authority is responsible (Figure A-2).

Future Drainage Strategy Macedon Ranges Shire Council is in the process of preparing a drainage audit of the major towns that will form the basis of a process to establish extreme event overflow paths through urban areas. Where buildings are, or may be, constructed within a potential inundation area, an overlay is proposed to be included on Councils GIS plans and the Macedon Ranges Planning Scheme Maps. A Planning Permit will be required for development within these areas once the Planning Scheme is appropriately amended. Floor level control can then be imposed on proposed development to ensure floods up to 1 in 100 years will not damage or inundate future buildings.

Sites less than 2 hectaresConditions are included on Planning Permits for developments and subdivisions requiring compliance with best practice stormwater quality requirements. Where these are not achieved and all reasonable actions within the subdivision or development proposal have been investigated and found to be inappropriate or impossible, the appropriate drainage authority may offer other options, as outlined in the Practice Notes.

The Council will require designers to provide details of investigations undertaken for compliance and reasons why compliance is not achievable. Negotiations will be entered into with the applicant to ensure the best outcome is achieved from the proposal. Negotiations may result in acceptance of a financial contribution equivalent to the “Melbourne Water “form A”” contribution calculation towards future drainage treatment works in the Township or local area. These works may not necessarily be in the immediate vicinity of the subject land.

Water Sensitive Urban Design Guidelines Addendum Macedon Ranges Shire Council4

.

Rainfall data to be used in MUSICThe rainfall stations and reference years for the Macedon Ranges Shire have been identified by Melbourne Water and are shown in Figure A-1 (Mean Annual Rainfall Distribution – Greater Melbourne). Figure A-2 outlines relevant rainfall stations for the area of Macedon Ranges Shire Council outside the Melbourne Water boundary. The following rainfall stations should be used for MUSIC modelling within the Macedon Ranges Shire (refer to Figure A-1 and A-2 for the locations of the various rainfall bands, and representative stations):

Inside Melbourne Water’s Boundary:

• Little River (87033) - 2004

• Melbourne Airport (86282) - 1996

• Melbourne City (86071) - 1966

• Koo Wee Rup (86062) - 2004

• Narre Warren North (086085) - 1998

• Mount St Leonards (86142) - 1998

Rainfall-runoff parameters

Rainfall-runoff parameters are outlined in the MUSIC User Manual (eWater, 2009) (see Table A-2).

Table A-2: Rainfall-runoff default parameters for Melbourne (MUSIC User Manual, 2005)

Parameter Value

Impervious threshold 1 mm

Initial soil storage 30%

Infiltration capacity 200 mm

Infiltration exponent 1

Initial groundwater store 10 mm

Daily recharge rate 25%

Daily drainage rate 5%

Daily deep seepage rate 0%

Soil store capacity 30 mm

Field capacity 20 mm

Fraction impervious

Nominate fraction impervious for various land types – use Melbourne water standard.

Pollution Concentration data

The default parameters for the pollution concentration data (total nitrogen, total phosphorus and total suspended solids) should be used for identified land uses (MUSIC Input Parameters, 2010). Use Melbourne standard.

Large Scale Stormwater Harvesting

This will be considered on a case by case basis.

Plant ListsDevelopers are referred to Appendix A of the WSUD Engineering Procedures: Stormwater Guide (2005).

Plants selected must have shallow root systems that will not interfere with the underground drainage collection system and be suited to a coastal environment.

Design must be undertaken by a suitably qualified and experienced person and include consideration of Council’s maintenance regime to facilitate low cost maintenance procedures.

Macedon Ranges Shire Council has a tree species list available on its web site that must be considered in any proposed design. For plants specifically used as part of the WSUD train that specific advice must be obtained by reference to Manager Parks & Gardens.

Water Sensitive Urban Design Guidelines Addendum Macedon Ranges Shire Council5

Council-specific design requirementsIt is noted that discharges from WSUD treatment systems must be maintained at 1.5 yr ARI pre-development levels under the Best Practice Environmental Management Guidelines for Urban Stormwater (See Sections 1.7 and 2.2 for concept design criteria).

Discharge from the subject land must be maintained at a minimum 10 yr ARI pre-development level for the entire drainage system where an appropriate extreme event overflow path exists for the outfall from the subject land for the acceptance of storm flows up to 100 yr ARI. However, designers must ensure that discharge from land the subject of development applications is in accordance with the capacity of the existing drainage outfall system which may be less than 1:10 yr. The Developer is required to establish the capacity of the downstream network if not known by the responsible authority.

Compliance may require the upgrading and/or reconstruction of existing drainage systems where sufficient storage is not possible on the subject land to restrict discharge rates sufficiently. It could also require the design of main drains at a 10 yr ARI within the site for connection to the outfall system, particularly if the main drainage line extends through the subject land for the acceptance of main drainage flows from up-stream.

Designs should also include the acceptance of all up-stream flows at 5, depending on upstream piped network capacity (or 10) yr ARI with surface flows up to 100 yr ARI and transfer these flows through the subject land to the satisfaction of the Council.

Where connection to Melbourne Water controlled regional drains is required or sites are wholly within the Melbourne Water drainage area, designs must be to the satisfaction of Melbourne Water and Macedon Ranges Shire Council.

Where rainwater tanks are proposed, storage will not contribute to required detention volumes.

For Industrial/Commercial developments then conditions that apply above must be complied with in addition to any treatment necessary to met EPA guidelines for treatment of trade waste or pollution a consequence of the business.

Council specific construction requirementsAt the practical completion stage, an inspection of the works shall be undertaken in the presence of the Contractor and a representative of the developers Engineering Consultant. Outstanding matters for completion shall be identified and the 24 month maintenance period shall commence depending on the nature of the incomplete works. If the outstanding works are of a maintenance only nature (top up of subsidence, plantings vandalised or damaged through no fault of the Contractor, etc), the maintenance period shall commence immediately. Should the inspection identify defects of a structural or physical nature (filter material not compliant / insufficient hydraulic conductivity of filter media (see Section 2.2.2), incomplete plantings or works including top soil, bunding / earthworks etc.), works shall be rejected and maintenance shall commence when works are complete.

Council-specific asset handover requirementAt the completion of the maintenance period that contractor must provide to Council evidence of the maintenance carried out and demonstrate that the WSUD is operating within the design parameters. Any non compliance must be corrected to Council satisfaction prior to acceptance and handover. An as built plan must be provided with a complete species list and source of supply.

Council-specific maintenance requirementsWhere Water Sensitive Urban Design systems are to become Council assets, developers must maintain the works, including landscape plantings, for 2 years prior to hand over.

For areas of grass, including grassed swale treatments and open parkland, the grass must be maintained in accordance with Council standard maintenance regimes to ensure the site is maintained in a tidy and user-friendly state, suitable for public use as intended at all times.

Compliance with the Fire Hazard requirements of the Municipal Fire Prevention Officer must also be considered. Grassland in and around wetlands or WSUD ponds must be slashed or mown to height not more than 150mm and thereinafter maintained in manner so as not to provide a threat to abutting property and land. The use of strategic fire breaks may be adopted after consultation with and direction by the Municipal Fire Prevention Officer. Clearance of any vegetated areas must be in compliance with Planning Scheme requirements for native vegetation when a Planning Permit may be required.

Water Sensitive Urban Design Guidelines Addendum Macedon Ranges Shire Council6

Table A-3: Summary of Council approved maintenance regimes

Asset Maintenance

Wetland – water body (1.0m from water edge )

Removal of litter as requested only. Siltation levels to be monitored and recorded every six months. Sediment to be cleaned out when accumulation at any point in the wetland reaches the invert level of the inlet pipe.

Aquatic plants Condition to be monitored and recorded every six months. Macrophyte harvesting as required. Plant replacement as required to keep a good coverage of aquatic plantings.

Edge planting of wetlands Removal of litter once a month or as requested. Edge treatment – erosion control and weed infestation to be monitored every six months and attended as requested. Plant replacement as required to keep a good coverage of marginal plantings.

Wetland – surrounds Removal of litter once a month or as requested. Removal of fallen tree debris prior to mowing. Mowing in accordance with Council’s cycle and intervention levels.

Pipelines, grills, concrete structures, rock weirs

Removal of litter and debris, blockages not to exceed 50% of inlet. Flush pipes of sediment prior to levels reaching 30% of pipe capacity.

Sediment ponds Removal of litter once a month around exterior of pond or as requested. Siltation levels to be monitored and recorded every six months. Sediment to be cleaned out when accumulation at any point in the wetland reaches the invert level of the inlet pipe.

Swale Removal of litter if requested. Sediment to be cleaned out when accumulation causes flooding of surrounding area.

Biorention basin and rain garden Removal of all litter and debris once a month. Monitor every six months and after large storm events. Sediment to be cleaned out when accumulation is within 50mm of overflow pit level.

Gross pollutant traps Monitor every 6 months and after large storm events. Clean annually or as required.

Netting protecting wetland area Netting to be assessed monthly and damage repaired until end of maintenance period. Must be removed prior to handover of assets to Council.

Access tracks to sediment pond Inspect following each desilting operation of the sediment pond and in accordance with Water Management Guidelines (currently under development). Remedy any risks to public health and maintain to Council standards.

Plants – trees, shrubs, garden beds and grassed areas.

Yearly tree pruning. Weeding every 6 months. Plant & mulch replacement once a year maximum. Litter and weed removal once a month or as requested.

Pedestrian paths – concrete paths and informal walking trails

Trimming of edges once a month. Monitor at monthly maintenance inspection. Clean and repair if required in accordance with Council standards.

Boardwalks and timber poles Monitor at monthly maintenance inspection. Clean and repair if required. Level 1 Safety assessment to be carried out every 6 months.

Lighting Cleaning and globe replacement as requested.

Bench seats Monitor at monthly maintenance inspection. Clean and repair if required.

Information signs and displays Monitor at monthly maintenance inspection. Clean and repair as reported.

Irrigation system Annual inspection. Carry out repairs and replace if damaged.

Pump & pump house – for irrigation

Operate and maintain as per manufactures specifications.

Herbicides - Approved herbicides must be used in accordance with supplier’s specifications.

Mowing - Grassland in and around WSUD infrastructure must be slashed or mown in compliance with the Fire Hazard requirements of the Municipal Fire Prevention Act.

Development Services SchemesTable A-4 lists the various Melbourne Water Development Services Schemes within the Macedon Ranges Shire Council.

Table A-4: Melbourne Water Development Services Schemes in Macedon Ranges

Scheme Number Development Services Scheme Suburb

6851 Central Creek, Gisborne Gisborne

6681 Romsey Romsey

6985 New Gisborne New Gisborne

6961 Riddells Ck Riddells Ck

6856 Tributary of Jacksons Creek Gisborne

Water Sensitive Urban Design Guidelines Addendum Macedon Ranges Shire Council7

Figure A-1: Mean Annual Rainfall Distribution (Greater Melbourne) (Melbourne Water, 2009)

Figure A-2: Mean Annual Rainfall Distribution (Outside Greater Melbourne)

1100mm to 2100mm – Mount St Leonard – 1998

850mm to 1100mm – Narre Warren North – 1998

750mm to 850mm – Koo Wee Rup – 2004

650mm to 750mm – Melbourne City – 1966

500mm to 650mm – Melbourne Airport – 1996

400mm to 500mm – Little River – 2004

Rainfall Range – Station Name – Reference Year

Koo Wee Rup

Little RiverNarre Warren North

Mt St Leonard

Melbourne Airport

Melbourne City

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GREATER BENDIGO CITY STRATHBOGIE SHIRE

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Refer to rainfall distribution map in the Melbourne Water guidlinesfor the use of MUSIC in this area

MITCHELL SHIRE

MOORABOOL SHIRE

MACEDON RANGES SHIRE

089094

088133

087112

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087075789

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087036848

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087095659

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088029569.42

088051575.68

088031851.17

088033646.04

088008623.46

088050669.65

088109559.33

088121602.48

088053581.69

088073681.49

088117809.57

088042729.03

088123772.99

088017769.25

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088061799.95

088062832.44

089021747.81

089001746.74

087044651.68

087073689.51

087042690.42

089048865.56

087046782.37

087043613.82

087067876.23

087011885.42

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087045935.82

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Shire BoundaryMean Average Rainfall ContoursMelbourne Water Boundary

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2114470AProject No.:

A9Revision:

Drawn By: SW

Checked by:

Date: 04/04/2011Coordinate System

GDA94 - VICGRID

DD

Representative Station Number Representative Station Name Representative 6 Minute Data Year087039086282086071088037086085

MeltonMelbourne AirportMelbourne CityLauriston ReservoirNarre Warren North

19981996196619851998

Mean Average Rainfall Range400-500500-650650-750750-850850-11001100-1800 086142 Mt St Leonard 1998

Macedon Ranges Shire Council 129 Mollison Street, Kyneton VIC 3444 Telephone: (03) 5422 0333 Fax: (03) 5422 3623

www.mrsc.vic.gov.au

ISBN 978-1-921603-12-9 (print) ISBN 978-1-921603-13-6 (web)

Published April 2011.

© Copyright April 2011 Melbourne Water and Macedon Ranges Shire Council. All rights reserved. No part of this document may be reproduced, stored in a retrieval system, photocopied or otherwise dealt with without the prior written permission.

Disclaimer: This publication may be of assistance to you but Melbourne Water, Macedon Ranges Shire Council and these organisations’ employees do not guarantee that the publication is without flaw of any kind or is wholly appropriate for your particular purposes and therefore disclaims all liability for any error, loss or other consequence which may arise from you relying on any information in this publication.