Introduction:
This Design Note, provides guidelines and requirements in relation to Design & Construction of Infrastructure to be handed over to Moyne Shire Council through the various Acts & Permits
1. Drainage
- The use of step irons in pits is not accepted in The Shire, all pits are to be manufactured in accordance with this. Pits with step irons cut off will not be accepted
- Drainage pits are not to have sumps and are to be grout filled sloping to the invert level of the outlet pipe, designers are to include a note on plans to this effect.
- Contractors are reminded that when specified on the plans for a Double Side Entry Pit, only DSEP will be accepted. Single Side Entry Pits joined together will not be accepted.
- FRP Pits are to be used refer to Design Note: Pit Lids
- In accordance with ARR 2019 the following shall apply
Type of structure
|
Design blockage
|
Severe blockage
|
Sag kerb inlets
|
Kerb inlet only
|
20%
|
100% (all cases)
|
Grated inlet only
|
50%
|
Combined inlets
|
Capacity of kerb opening with 100% blockage of grate
|
On grade kerb inlets
|
Kerb inlet only
|
20%
|
100% (all cases)
|
Grated inlet only
(longitudinal bars)
|
50%
|
Grated inlet only
(transverse bars)
|
50%
|
Combined inlets
|
10% blockage of combined inlet capacity on continuous grade
|
Given the above it is not economical to use grated inlet pets as such their use is restricted other than in exceptional circumstances. Their use is to be approved, in writing, prior to the submission of drawings.
- Kerb adaptors are not to be used for new developments/subdivisions
- Property Inlets/House connections in line with IDM SD510 are not to be used in new development/subdivisions
2. Approval Process
All submissions of engineering plans in the first instance are to go to Moyne@Moyne.vic.gov.au the plans are to be accompanied by all calculations and the relevant IDM Checklists. Consultants are to include the applicable Planning Permit number and Certification number in the subject line
Consultants should note that the statutory timeframe for the checking of drawings will not start until all of the following have been complied with and/or submitted:
- Planning Permit issued
- Completed relevant IDM Checklist(s)
- Pavement Design & Geotechnical Report
- Stormwater Management Plan
- Functional Layout Plan
- Safety Audits for Roads and Major Drainage infrastructure
- Construction Management Plan
- Proposed Plan of Subdivision
- Local Area Traffic Management Plan
- Public Lighting/Electrical Plan
- Proving for Existing Utilities
- Construction/Site Environment Management Plan (CEMP) https://www.melbournewater.com.au/building-and-works/developer-guides-and-resources/standards-and-specifications/develop-site
- Tree protection plan
3. Crossovers
Access for each individual lot is to be provided at time of subdivision by the developer and is to be shown on any plans for approval.
4. Water Quality
Council will accept treatment from grassed swales in low density residential development (LDRZ) subject to these swales meeting minimum/maximum longitudinal grade, maximum batter slopes and can be easily maintained. Council will not accept raingardens, bioretention swales and sand filters. Bio retention basins will generally not be accepted in Greenfield areas with Sedimentation basins and Constructed wetlands being the first design option. All designs of treatments must come with relevant computations using best practice methods for the size of the development and designed to IDM, Moyne Shire & Melbourne Water Guidelines.
5. Batter Slopes
To ensure safety, maintenance and amenity outcomes the following batter slopes must be met for residential development including LDRZ & TZ:
Grade
|
Situation
|
1 in 6*
|
Open Drains in Greenfield Development
|
1 in 8
|
Open Drains carrying floodwater
|
1 in 8
|
All basins
|
* Subject to mower being able to move along in a sideways manner (no water pooling expected)
Batter slopes in existing areas should meet a maximum of 1 in 5. This may require the altering of service depths.
In greenfield developments this may require road reserve road reserve widths to be greater than the absolute minimum to ensure all infrastructure & landscaping is catered for.
6. Changes to Approved Drawings
Consultants should note that any changes to approved drawings are to be properly documented. Each page of the construction drawings that is effected by the proposed change is to be updated and clouded a full set is to be resubmitted for review/approval.
7. As-Constructed Drawings – IDM Section 7.5 & 7.6
The IDM requires that As Constructed drawings be submitted to Moyne Shire as part of the Acceptance of Works (Statement of Compliance) process. As constructed drawings are to be provided to Council in AutoCAD .dwg format and .pdf. The plans are to be MGA 2020 and digitally scalable
8. Certification of Plan of Subdivision Prior to Approval of Detailed Design plans.
Section 17 of the Subdivision Act. States that “Works must not start until the Plan of Subdivision has been certified”
Therefore, if Engineering Plans are approved without a certified plan of Subdivision,
- Works must not start without a certified Plan of Subdivision AND
- The submitted Plan of Subdivision must match the approved plans OR
- The engineering drawings shall be resubmitted to match the Plan of Subdivision
9. Issue Statement of Compliance / Start of Defects Liability Period – IDM Sec 7.5-7.7
Consultants should note that a Statement of Compliance (SOC) can only be issued after all the relevant referral authorities have each given their releases. Council’s Engineering Department, acting as an internal referral, requires, as a minimum, for the Engineering SOC release, all of the following
A) That the inspector agrees that the works are to Council standard and has been provided with copies of test results as requested.
B) All test/inspection records are available eg -
i) CCTV of all drainage pipes and pits in accordance with WSA code (Provided prior to PC, Road Crossings to be reviewed prior to wearing course
ii) Pavement Compaction (Provided prior to advancement of each layer & prior to proof role)
iii) Fill/backfill compaction tests
iv) Filter media test results (where Bio-retention elements have been approved)
C) That any outstanding issues be documented
D) That any bonds are paid/arranged
E) That the calculations for the subdivision fees and bonds have been submitted for checking, agreed and the fees been paid
F) That as-constructed drawings have been provided
10. Assessment and delivery of Cheques and Bonds
Prior to lodgement of any fees and/or bonds, the consultant must provide a copy of the Schedule of Rates for the works, along with the Engineering Fees Payment Form (attached below) to the Council’s Developer Officer at the address Moyne@moyne.vic.gov.au for approval. The consultant must provide a copy of the Schedule of Rates for the works which is to come in a pdf and excel format printable in A4.
A cover letter must be supplied and as a minimum, the information will include–
a) The name of the development (if applicable)
b) The address of the development
c) The planning permit number
d) The stage number of the development (if applicable)
e) Any relevant Council reference number
f) Engineering Works Payment Form