A.

HOBSONS BAY CITY COUNCIL

POLICY GUIDELINES FOR SUBDIVISIONAL CHECKING OF ROADS AND DRAINAGE CONSTRUCTION

TABLE OF CONTENTS

STATEMENT CERTIFYING COMPLIANCE WITH RELEVANT AUSTRALIAN/ COUNCIL STANDARDS AND CODE OF PRACTICE …………………………………………………..……1

PART I - FUNCTIONAL LAYOUT PLAN

A. PRINCIPLES ……………………………………………………………………………………………………………………3

B. WHAT IS TO BE SHOWN ON THE LAYOUT PLAN…………………………………………………….…3-4

C. SUPPORTING DOCUMEMNTATION ……………………………………………………………………….…..4-5

D. DETAILED FUNCTIONAL LAYOUT PLAN ……………………………………………………………….……….5

PART II - ENGINEERING DESIGN

A. LAYOUT PLAN …………………………………………………………………………………………………….………6-8

B. ROAD LONGITUDINAL SECTION ………………………………………………………………………….……8-9

C. CROSS SECTION ………………………………………………………………………………………………..……9-10

D. DETAILS OF INTERSECTION, COURT BOWLS AND SHARP CURVES ………….………10-11

E. DRAINAGE …………………………………………………………………………………………………….………11-17

a. Underground Drainsb. 1 in 100 year ARI Major Flows Designc. Retentiond. Water Sensitive Urban Design (WSUD)e. Gross Pollutant Traps (GPT’S)

F. CHECKING AND SUPERVISION FEES ………………………………………………………….…………….17

G. FINAL SUBMISSION OF DRAWINGS FOR APPROVAL ………………………………………………..17

STATEMENT CERTIFYING COMPLIANCE

WITH RELEVANT AUSTRALIAN/ COUNCIL STANDARDS AND CODE OF PRACTICE

This form duly completed and signed by an authorized agent of the Consulting engineer shall be submitted with “As Constructed” drawings for Council approval.

Name of Project/ Stage

Drawing No. and Revision No. Date of Submission

Owner/ Developer

Representative

Telephone Facsimile

Engineering Consultant

Authorized Representative

Authority to submit for Checking & Approval of Design Plans and Computations for construction and certify compliance with Australian/Council Standards and Code of Practice

Print Name Signed

Telephone Facsimile

Postal Address Signed

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PART I - FUNCTIONAL LAYOUT PLAN

A. PRINCIPLES

Design of Roads and Drainage Section in Infrastructure and Projects Division of Council requires the Consultants to prepare a Functional Layout Plan to assist in the preparation of a detail engineering plan subsequently for Council approval.It is expected that the Consultants deals directly with areas of Town Planning and Landscape Divisions in Council’s and resolves issues in Planning Permit pertaining to these Conditions separately as they will be approved by these areas in the final detail design . As such these conditions will be not included in this document. Note:

1. To assist Council officers in the checking of the plans, the functional layout plans must be provided, to scale, as hardcopy A1 plans. Digital versions of the plans may be provided, however, the hardcopy plans will be the basis of the checking.

2. Amendments in resubmitted drawing, as a result of Council’s comments or consultant’s own amendment shall be marked by ‘Cloud’ for the case of identification and completion. The ‘Cloud’ shall be removed in the final submission to Council for approval.

3. If incorrect information is supplied (e.g. existing features) Council reserves the right to require changes to the functional layout and or detailed engineering plans at anytime.

B. WHAT IS TO BE SHOWN ON THE FUNCTIONAL LAYOUT PLAN

The Functional Layout Plan must show:1. Show how drainage is proposed to be managed, both into and out from the subdivision.

2. Functional layout plan should show;a. Lot arrangementb. Road layoutc. Intersection boundaries and road reserve widthsd. Road widthse. Paths, for example:-

Cycle ways on road and off road (including links to external areas) Location of existing/proposed and future shared pathways Footpaths

3. Connections into existing/proposed/future development e.g. roads, paths, drainage etc.

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4. Drawing number and revision number (this assists in tracking changes and comments)

5. Road names or some identification (e.g. Road A)

6. Intersection treatments and LATM devices (existing and proposed)

7. Lot numbers

8. Existing and proposed drainage network including special features such as overland flow paths, outfall drains.

9. Vehicle crossing locations

10. Service reticulation (i.e. sewer G, T, W etc). These details are to be shown as overlays on the plan. Offsets to property boundaries are to be shown on the plan or as a table of space allocation offsets. Note that Council will not accept services running parallel under Council assets, e.g. roads and footpaths

11. Show parking bays and indicate on street parking spaces

12. Location of existing and proposed road crossing facilities (pedestrian and school)

13. Locations of proposed and future bus routes, bus stops and bus bays

C. SUPPORTING DOCUMENTATION

The documentation that is to accompany any Functional Layout Plan is to include the following:- Copy of planning permit Locality plan Traffic assessment including:-

- Traffic volumes, intersection analysis (e.g. Sidra)- Road hierarchy- Future and existing bus routes- Cycle path network and strategy- Design speeds- Critical sightlines (modified T and bends)- Indented car parking requirements where on street parking is not available with 30m from the

allotment Typical cross sections showing kerb types/service layout/path locations etc. Master drainage plan (minor and major) showing upstream and downstream catchments. Include

cross section analysis at critical points. This documentation needs to be in sufficient detail to

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determine such things as whether road widths are sufficient to convey flood flows and provide for any freeboard requirements.

Any other previous agreements and supporting documentation Detailed Functional Layout Plans (see below) for traffic treatments and intersections

D. DETAILED FUNCTIONAL LAYOUT PLAN

A detailed Functional Layout Plan scaled at 1:250 must be provided for each traffic treatment e.g. speed hump, road restriction etc. and each intersection and show the following:-

Mounting strips Lane widths Reservation (road) widths Sightline assessment where applicable Vehicle tracking paths (bus, truck, garbage, car turning, where applicable) Bus bays and bus stops Vehicle crossings Kerb radii Design speeds Footpaths, shared paths and perambulator crossings Stormwater pit locations Kerb profile (i.e. offsets, geometric shape) Highlight any clear zone design issues at critical locations (e.g. culvert crossings, power poles

etc.) Drawing number and revision number

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PART II - ENGINEERING DESIGN

A. LAYOUT PLAN

1. Level datum (T.B.M.) using A.H.D. and north point are required to be shown. T.B.M’s are to have AMG coordinates.

2. Show location and AHD level of permanent survey marks.3. Natural and finished surface levels must be shown on every corner of

every lot. Slope of the land to be indicated by arrow, minimum lot grade is to be 1:80.

4. The finished surface levels at the back of residential allotments are to be designed in accordance with Rescode section 56.09 so as to ensure that overflow is directed to the major drainage system i.e. the road reserve. The back of the lots (from the road reserve) are not to contain a valley shaped arrangement.

5. a) The construction plan N.S. levels are to agree with the sealed plan natural surface levels, if available.

b) Easements on construction plans are to agree with sealed plan of subdivision.

6. Set out information on layout plan or on construction plan is to be sufficient, clear and allow accurate setout on site. Lot corners and set-outs must relate to MGA (Map Grid of Australia). Layout must provide adequate horizontal and vertical control.

7. Offsets to drainage in easements to be shown to center of drain.8. Show alignments and offsets of all services (particularly sewers in

easements) on layout plan - note: engineering plans will not be approved until service authorities and Council approve of alignment and clearances. Service offsets and locations shall be in accordance with typical cross-sections specified by the Street Works Co-ordination Committee Code of Practice or as agreed with the service authorities and Council.

9. Drainage layouta) Longitudinal drainage pipe alignments are not permitted to be

located under road pavements and kerbs but shall be located behind back of kerbs. Road reserve widths are to be widened to accommodate the larger diameter pipes behind back of kerb and other services within the road reserve.(i) None longitudinally under kerbs.(ii) Acute intersection angles between lines at pits are not

permitted.(iii) Curvilinear pipe alignments are not desirable and are to be

used only in exceptional circumstances. If used, radii must comply with manufacturer’s recommendations.

(iv)Potential conflict with other services.

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b) Drainage pits in road reserves to be located by centre-line chainage and if located other than behind the kerb, offsets to be shown.

c) Drainage pits are to be provided at intersection of drainage lines and changes of direction of drainage line.

10. Side entry pits to Council’s Standard Drawing no. SD4 - lintel and concrete cover with circular insert.

11. All pits in the pit schedule are to make reference to Council’s Standard Drawing Number (or if required VicRoads Standard Drawing number).

12. All drains to have an outfall. Council does not permit blind drains pending development of successive stages, i.e. Under ground drains to have an outfall to an underground drain not open channel.

13. Where road works are truncated pending development of further stages, a temporary A.G. drain shall be installed across the end of works, to prevent seepage of water into the pavement, along with a concrete edge beam and a ‘No Road’ sign. AG drains are to drain to an appropriate point of discharge egg. drainage pit.

14. All pipes are to be spigot and socket type, rubber-ringed jointed. Ensure that the socket does not extend into pavement boxing.

15. A plan showing all services shall be included. All services are to be provided to each lot, including municipal reserves, and sufficient conduits should be provided for future installation of services. If service locations are not finalized, three conduits (G, W, T,) are required for each lot including municipal reserves.

16. Where a subdivision is proposed to join an existing fully constructed road, existing conduits should not be left inaccessible.

17. Vehicle crossing locations :a) Should be one for each lot. Where the side boundary meets the

front boundary with an angle of between 80° and 100° the vehicle crossing is to be perpendicular to the front boundary (refer Council standard drawing SD10). Where the angle is less than 80° or greater than 100° a turning template (20 km/hr) must be used and generally the vehicle crossing is to be aligned to be parallel with the side boundary.

b) Vehicle crossings are to be clear of bends, intersections, easements and other obstructions and shall comply with AS 2890.1 – 2004.

c) Vehicle crossings should be located clear of traffic islands allowing suitable turning circles in and out of crossover.

d) Provide a 4.0m wide industrial strength vehicle crossing to all Council Reserves.

e) Vehicle crossing widths to be consistent with intended use of the property e.g. industrial use truck turning templates.

f) In industrial allotments, vehicle crossings are better located in the centre of the blocks.

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g) Double vehicle crossings are to be used where the distance between single vehicle crossings is less than 1.5 metres.

18. Extent of all filling to be shown on the layout plan (whether proposed filling or filling that has previously been placed). Compaction of all filling is to be to the applicable Australian standards and notes are to be included on the plan.

19. Existing and proposed or finished surface levels to be given at corners and ridges of all filled areas. The proposed treatment of filling close to boundaries is to be shown, including abutting existing or future development. Details are to be given as to measures to prevent runoff entering abutting properties and measure for structural stability

20. Lot protection - Roads and allotments are to be designed such that the allotments are to be protected with minimum 300 mm freeboard against 1 in 100 years flooding.

1.B. ROAD LONGITUDINAL SECTION

1. Information required on Longitudinal Section -a) Natural Surface for both building lines,b) Proposed top of kerb levels, c) Grading to be shown as (-) or (+) percent (to two decimal places).d) All vertical curve lengths, B.P.s. and ‘e’ values to be shown.e) Show continuation of grading for abutting existing or future

extension of road, for distance of 30m beyond stage of works.f) Scales required - Horizontal 1:500 Vertical 1:50

2. Minimum grades allowable on kerbs is 0.33% (drainage 0.5%) including peaks and troughs of V.C.’s., maximum grades allowable on kerbs is 18%.

3. Maximum allowable change of grade is to be 1.0%. Vertical curves are required for changes of grades greater than 1.0%.

4. Vertical curve levels are to be given at min 5m intervals.5. Cross sections are to be provided at TP's, changes of grade and at

intersection of property lines with maximum spacing of 20 metres.6. Super elevation is required on Primary and Secondary Arterial Roads;

however, it is not required on Collector Roads or Local Streets.7. All low points to have double S.E. pits. Particular attention being

given to low points at the end of court bowls, where a double S.E. pit and a floodway for the overland relief of 1 in 100 A.R.I. flood waters are required to be provided i.e. captive low points are not acceptable. Low points are not acceptable on kerb returns.

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8. Pit spacing and number are to be designed to meet flows and grades, as per AR&R 1999 or latest edition.

9. Datum R.L. must be given on the axis of long section.10. Location (chainage) and R.L. of high and low points to be shown and

endorsed accordingly.

C. CROSS SECTION

1. Service offsets and locations shall be in accordance with typical cross-sections specified by the Street Works Co-ordination Committee Code of Practice or as agreed with the service authorities and Council.

2. Required scales for cross sections - Horizontal 1:100, Vertical 1:50.3. Finished levels are to be given at the following locations, back of

kerbs or lip of kerbs, centre lines, building lines, front of footpath and N.S. levels at building line.

4. Datum is to be shown on each cross section.5. Cross section cross-falls are to be within the following limits:

Footpath : Desirable 1:30 Nature Strips : Between front of footpath and top of kerb:

Minimum 1:30Maximum 1:10

Note: Any cross-fall greater than 1:10 must be checked individually for driveway access with vehicle template.Pavements : Minimum 1:50

Maximum 1:20Desirable 1:36

Batters : Maximum 1 in 5 (cut), 1 in 5 (fill)6. One-way cross fall pavements should be raised 25mm at the centre

line from a straight bone between lips of channels.7. Cross sections are to be provided at Tangent Points (T. P.’s), changes

of grade and intersection of property lines with a maximum of 20 metres.

8. On at least the first section of each sheet the section boxes are to be labeled (i.e. Offset, Design Surface Level, and Existing Surface Level) and notations indicating cross falls and widths (i.e. pavement, footpath, nature strip, batters).

9. Allow 300mm wide berm behind kerb or footpath before batter.10. Reverse fall on footpaths are not permitted.

11. Service conduits and A.G. drains are to be shown in accordance with Standard Drawing No. SD21.

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12. Provision for Size 7 asphalt to be used in court bowl heads and where manual placement is required.

D. DETAILS OF INTERSECTIONS, COURTS & SHARP CURVES

1. Scale for details to be 1 in 200.2. For kerb returns at least four kerb levels are required i.e. at quarter

points.3. Consultants must provide contours (at 0.05 metre intervals) on all of

the intersections, court and curve details.4. S.E.P.’s in radials are not permitted. S.E.P.’s shall be clear of pram

crossings and driveways and not located in kerb returns.5. Setting out details, (including intersection angle) radii and tangent

points must be shown.6. Standard size of radii for standard T intersections are -

Residential areas : minimum radii 8m to BOKIndustrial areas : minimum radii 15m to BOK

7. Pram crossings in all court bowls to be appropriately specified and shown, particularly where shared footways inter-connect court head treatments.

8. Corner splays at residential allotments require 3m by 3m corner splays.

9. All traffic management devices (traffic signals, roundabouts, modified T’s, road humps etc) require a sign schedule and line marking plan.

10. Court bowl design for courts: Residential area – Court bowl treatment must be provided at road

terminations at courts or access places. Court bowl shall be able to accommodate the full U Turn of Council’s 10.5m long garbage trucks with minimum court bowl diameter of 21m (to back of kerb). Separate indented car parking spaces are to be provided for allotments abutting the court bowl.

Industrial areas - design shall be able to accommodate the full U Turn of 19m long semi trailers with minimum court bowl radius of 15m (to kerb lip).

11. Roundabouts to have SM3 type kerb on central islands.12. At intersections, roads alignments are to meet at right angles.

E. DRAINAGE

1. The design of underground drainage and major overland flow drainage in subdivision developments must provide for the drainage of future upstream developments.

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2. Underground and major overland flow drainage must be connected to approved outlets or outfalls. No blank drainage outlets will be allowed.

3. Outfall drainage for both underground and overland flow must to be provided for the total stage development when the initial stage subdivision is submitted. Each stage must have an approved outfall.

4. Temporary catch drains are required between development of stages to protect roadwork and properties from overland flows.

a. Underground Drains1. In accordance with the overall master plan of the

development (see Functional Layout Plan in Part I), design documentation for each subdivision stage of the development to be submitted shall include: A coloured scaled and contoured plan showing the

catchment areas contributing from within and outside the sub-divisions.

Connections to approved outfalls downstream including any Melbourne Water documentations.

Pipe design calculation incorporating hydraulic grade lines (HGL) analysis calculations are also to be included to achieve the minimum freeboard at drainage pits is 300mm.

2. All drainage pipes shall be spigot and socket type and rubber-ring jointed reinforced concrete pipe. For pipes 150mm or less other materials will be considered.

3. Pipe class is to be selected (designed) in accordance with applicable Australian Standards taking into account the laying and backfill specifications, overburden, construction loadings and other imposed loads.

4. Underground drains (minor flows) are to be designed in accordance with in accordance with Australian Rainfall and Runoff – 1999 or later edition for the storm recurrence intervals of: 1 in 5 years ARI for residential developments 1 in 10 years ARI for industrial and 1 in 20 years

commercial developments5. All lots are drained to an underground drain, consideration

maybe given in difficult situations for house drains connections to kerbs at the uppermost end of drainage catchments. Provision is to be made for property dishes at the front or rear of the properties.

6. Underground drainage must not be designed to be under pressure i.e. design flow not greater than capacity of pipe running just full.

7. Property inlets must be shown on layout plans.

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Property Inlets - 1m from low boundary. House Drains - 5m from low boundary.

8. House drains under vehicle crossings are to be avoided (if unavoidable the drain is to be of sewer class quality and strength).

9. Drainage lot controls are to be considered and are to meet the following criteria: Maximum grade of pipe is 1 in 100. In Industrial Subdivisions, cover of pipe is 600mm and

minimum diameter is 150mm. In residential subdivisions, cover of pipe is 450mm and

diameter is 100mm10. Longitudinal sections shall be given for all drainage lines. All

services must be shown with levels and clearances detailed. The hydraulic grade lines (HGL) are to be plotted in the longitudinal sections.

11. Grades flatter than 1:500 are to be avoided due to problems in laying.

12. Absolute minimum velocity through steel reinforced or fiber reinforced pipe is to be 0.6m/s. Absolute maximum velocity through pipe 6m/s. Where velocity exceeds 6m/s, corrugated pipes should be used. Consider manufacturer’s specifications.Note: These are partial flow velocities based on pipes flowing with zero head.

13. Pipe sizes to be shown and invert levels to be given at pits.14. Minimum pipe size allowable 225mm diameter (easements

and nature strips. Minimum pipe size allowable under road pavement is 300mm diameter.

15. The drainage pipe class must be designed in accordance with current Australian standard for taking into account loading, trench and backfill conditions etc.

16. Cover for pipes under roads to be a minimum of 150mm below top of sub grade levels. Minimum cover for drains in nature strips laid parallel to and behind back of kerb is to be 600mm. Minimum cover for elsewhere in the nature strip and in easements is to be 300mm.

17. Cover to underground UPVC drains to comply with AS/NZ2032-2006 or latest edition. Recommended minimum cover for UPVC pipes - See page 4-81 Hardies textbook of pipeline design.

18. Drainage pits and other services pits are to be clear of driveways.

19. Anchor blocks are to be used where pipe grades are greater than or equal to 1 in 10

20. Rainfall intensity (I) should be calculated in accordance with Chapter 2 or Australian Rainfall & Runoff – 1999 or the latest

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edition. The drainage computations should either be in accordance with the Australian Rainfall & Runoff – 1999 or the latest edition, or the VicRoads - ‘Road Design Guidelines’ Method (Part 7 - Drainage) - (Provide H.G.L. design with computations).

The following parameters should be followed -

B. Minimum Roughness Values for Colebrook – White Equation (Ks) & Manning’s Equation (n)

n value Ks (mm)Corrugated metal pipe 0.027 *Reinforced concrete pipe

0.013 0.60

P.V.C. pipe 0.009 0.015F.R.C. pipe 0.010 0.015

(*consultant to provide values from manufacturer)

C. Coefficient of Runoff ‘C’For residential allotments only C = 0.50For medium density residential C = 0.70For high density residential C = 0.80For industrial developments C10 = 0.85For paved or roofed areas C = 0.90For permanently grassed areas C = 0.33

D. Pit Head LossesFor VicRoads ‘Road Design Guidelines’ Method (Part 7 - Drainage) – 1996.

Losses to be allowed for1. Pit entry2. Velocity change (negative head loss not

allowed)3. Change of direction4. Depth of pit and drop across pit to be

designed to prevent excessive heading up in pit - (minimum pit drop is 75mm).

For AR & R method - (Australian Rainfall & Runoff):Losses to be allowed for

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1. Entrance loss2. Exit loss

21. Reduction of pipe sizes downstream is only allowable for diameter (D) greater or equal to 600mm. Pipe down-sizing is for one pipe size only, i.e.: 600 down to 525.

22. Pit spacing for road and easement drainage on reasonably flat gradesMaximum spacing : 75mOn steep grades, maximum spacing shall be 45m.

23. Check capacity of S.E. pit – provide closer spacing, double S.E. pits or grated S.E. pits if necessary. Double side entry pits maybe required at all low points (depends on catchment area), with provisions for the overland relief of floodwaters and blockage factor. Refer to VicRoads ‘Road Design Guidelines’ (Part 7 - Drainage). Provide pit capacity and capture computations. The width of flow within the K&C and pavement cross fall shall not exceed 1.5 m (for minor storm flow).

24. Heavy duty Gatic covers or equivalent to be used for all pits within the road reserve in industrial/commercial sub-divisions.

25. A drainage pit must be constructed at the junction of two Council underground drains.

26. Outfall drains -a. Melbourne Water or relevant authority approval is

required to discharge into main drains or water courses. Provide details including end wall requirements.

b. Suitability of any temporary outfalls - (including safety fencing).

c. Check if easement has been obtained if the outfall is outside the limits of the subdivision.

d. Erosion protection - Refer to VicRoads ‘Road Design Guidelines (Part 7 - Drainage) and Melbourne Water requirements.

e. Melbourne Water approval is required for Main Drain traversing the sub-division.

f. The outfall drain is to be located as close as possible to the creek water level and rock chutes at outfall drains (if provided) are not to contain a length greater than 5m.

27. Note that where drainage pipes are located within nature strips behind the back of kerb (BOK), the trench shall be backfilled with compacted Class 3 crushed rock up to a level of BOK.

b. 1 in 100 years ARI Major Flows Design1. Design major flow (1 in 100 years ARI) drainage to provide

overland relief floods within the subdivision development taking into account all contributing drainage areas,

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contributing from within and outside the subdivision. Effects on the low side of the subdivision to be taken into consideration and dealt with appropriately.

2. In accordance with the overall major flows master plan (see Functional Layout in Part I), major flows drainage plan shall be submitted for each subdivision stage of the development. The major flows drainage plan submission must include the following: A scaled, contoured and coloured catchment plan. Include the upstream catchment areas impacting on the

stage of subdivision. Provide design calculations such as HECRAS modeling. The flow paths from upstream catchments, through the

development and subdivision stage and downstream connections are to be shown.

The major flows along roadways, spillways, channels and other flow paths are to be designed to meet safety limits.

The major flow drainage plan is form part of the overall master plan for the entire development. The overall major flows master plan should be updated as the development is progressed.

3. Majors flows must be contained within the road reserve and all allotments shall have a minimum freeboard of 300mm. Lots shall be filled and finished to surface levels of 300mm

minimum above designed flood levels. Maximum height of water‘d’ in the road, to be less than

50mm above the top of kerb, for ARI = 100 years. d max x V < 0.4m²/sec.

4. At areas where high water flow levels at roadways are more than 50mm above the top of kerb: A restriction to be placed on title (Plan of Subdivision)

advising of the flood level and floor level (300mm above flood level) applicable to the affected allotments may be required by Council.

The applicable flood level and floor level is to be indicated on each affected lot on the engineering plans.

300mm minimum freeboard is to be provided to protect the affected allotments.

Flows at the roadways shall be designed to meet Melbourne Water safety criteria, as a minimum, i.e. Daverage x V < 0.35m²/sec.

c. RetentionRetention in the form of retarding basins, enlarged underground pipes and other underground structures will be required where Council’s existing outlet drainage has insufficient capacity for the development, or as required by Council. Council will allocate the permissible discharge where retention is

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required.d. Water Sensitive Urban Design (WSUD)

Where proposed to be incorporated in the drainage design the provision of WSUD shall be in accordance with: Melbourne Water document - WSUD Engineering Procedure:

Storm water Australian Runoff Quality – A guide to Water Sensitive Urban

Designe. Gross Pollutant Traps (GPT’S)

GPT’s shall be manufactured units and installed on site. GPT design requirements are: GPT units are to be designed and selected to collect gross

pollutants for 1 in 3 months ARI flows. Higher flows of lower frequencies are to be bypassed.

Generally, pollutants larger than 5mm need to be collected. Collection of sediment of size larger than 0.125mm will be requested where appropriate.

Selected and proposed manufactured GPT units are to be approved by Council.

The storage volume capacity of the GPT unit is to be designed to meet the loading rate criteria as shown in Table 8.1 of Australian Runoff Quality – A Guide to Water Sensitive Urban Design (Institute of Engineers Australia 2006).

The maintenance frequency of the GPT is 4 months. GPT units must be able to facilitate or support suction

(vacuum) cleansing by Council’s maintenance truck. For maintenance, Council’s truck requires parking such that

the distance between the rear corner of the truck and the GPT unit opening cover is 1m. Where necessary a heavy duty vehicle crossing and parking bay are to be provided for truck access to the GPT unit.

Engineering drawings must show the actual locations of the GPT unit opening and the orientation of the park bay and industrial crossing.

The engineering drawings must show the lines and grades of the GPT unit, inlet pipes and bypass details.

Bollards incorporating lockable barriers must be provided to deter undesirable parking at the truck park bay.

Lockable barriers must be operated using Council’s standard padlock. The padlock is to be issued by Council and the cost is to be borne by the developer.

F. CHECKING AND SUPERVISION FEES

Subdivisions

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3.25% design and checking fees as per the Subdivisions Act 1988 applies. An initial fee payment equivalent to 2% of the estimated cost of construction works (0.75% - checking fee; 1.25% - half of the supervision fee) is required before the approval of engineering drawings is given. The remaining 1.25% (half of the supervision fee) of the estimated construction cost is required prior to issue of the Statement of Compliance or Practical Completion whichever is the earliest.

G. FINAL SUBMISSION OF DRAWINGS FOR APPROVAL

The final construction plan is to be "Construction Issue" in order to reduce confusion with superseded plans.Hard copies of the plans (2XA1, 1XA3), digital copy of plans (CD) in PDF format and two (2) sets of specifications (if appropriate) are to be submitted for approval by Council. (Refer to Section B2 & C for details of approval.

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