SPECIFICATION 402
SURFACE DRAINS AND LEVEES
Copyright MAIN ROADS Western Australia
MAIN ROADS Western Australia
Contract xxx/xx
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
Page 1 of 11
SPECIFICATION 402
SURFACE DRAINS AND LEVEES
REVISION REGISTER
Date
Clause
Number
Description of Revision
Authorised
By
10 Jul 08
Whole
document
Complete revision of Issue
SRE
1 Aug 06
Whole
document
Complete revision of Issue
3.1 to new format
MCP
MAIN ROADS Western Australia
Contract xxx/xx
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
Page 2 of 11
CONTENTS
Clause
Page No
GENERAL ................................................................................................................ 4
402.01 SCOPE ..................................................................................................... 4
402.02 REFERENCES ......................................................................................... 4
402.03 – 402.05 NOT USED .............................................................................. 4
PRODUCTS AND MATERIALS ............................................................................... 4
402.06 CONCRETE ............................................................................................. 4
402.07 ROCK PROTECTION ............................................................................... 5
402.08 PROPRIETARY PRODUCTS ................................................................... 5
402.09 – 402.25 NOT USED .............................................................................. 5
CONSTRUCTION ..................................................................................................... 5
402.26 GENERAL ................................................................................................ 5
402.27 TABLE DRAINS (INCLUDING TYPE E) ................................................... 6
402.28 TABLE DRAIN BLOCKS AND DROP STRUCTURES .............................. 6
402.29 OFFSHOOT DRAINS (TYPE A) ............................................................... 7
402.30 SIDE DRAINS (TYPE B) ........................................................................... 7
402.31 CATCH DRAINS (TYPE G) ...................................................................... 7
402.32 SPOON DRAINS ...................................................................................... 7
402.33 CULVERT DRAINS (TYPE F)................................................................... 7
402.34 LEVEES ................................................................................................... 7
402.35 DRAINAGE BASINS ................................................................................. 8
402.36 – 402.70 NOT USED .............................................................................. 8
AS BUILT AND HANDOVER REQUIREMENTS ...................................................... 8
402.71 – 402.90
NOT USED .............................................................................. 8
CONTRACT SPECIFIC REQUIREMENTS ............................................................... 8
402.91 – 402.99 NOT USED .............................................................................. 8
402.91 TOPSOILING IN DRAINS....................................................................... 10
402.92 LANDSCAPING FOR DRAINAGE BASINS ............................................ 10
MAIN ROADS Western Australia
Contract xxx/xx
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
Page 3 of 11
SPECIFICATION 402
SURFACE DRAINS AND LEVEES
GENERAL
402.01
SCOPE
1.
The work under this specification consists of the
construction of all types of surface drains, levees, and drainage basins.
402.02
REFERENCES
1.
Australian Standards, MAIN ROADS Western Australia
Specifications and MAIN ROADS Western Australia Test Methods are
referred to in abbreviated form (e.g. AS 1234, MRS 67-08-43 or WA
123). For convenience, the full titles are given below:
Australian Standards
AS 4671
Steel Reinforcing Materials
MAIN ROADS Specifications
Specification 301
CLEARING
Specification 302
EARTHWORKS
Specification 404
CULVERTS
Specification 406
ROCK PROTECTION
Specification 901
CONCRETE-GENERAL WORKS
402.03 – 402.05
NOT USED
PRODUCTS AND MATERIALS
402.06
CONCRETE
1.
Concrete shall be supplied and placed as specified in
Specification 901 CONCRETE - GENERAL WORKS.
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Contract xxx/xx
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
Page 4 of 11
2.
Reinforcing steel shall conform to the relevant requirements
of AS 4671 Steel Reinforcing Materials. The cleaning, binding, fixing
and tying of all reinforcement shall be completed as specified in
Specification 901 CONCRETE - GENERAL WORKS.
402.07
Steel Fabric
ROCK PROTECTION
1.
Stone pitching and rock protection and any associated
materials such as mortar shall be supplied and placed as specified in
Specification 406 ROCK PROTECTION.
402.08
PROPRIETARY PRODUCTS
1.
Proprietary products shall only be used where specified on
the Drawings or where approved by the Superintendent.
2.
If used, proprietary products shall be used only in
accordance with the manufacturer's instructions.
402.09 – 402.25
NOT USED
CONSTRUCTION
402.26
GENERAL
1.
The location of the various types of surface drains, levees
and drainage basins shall be as shown on the Drawings.
Locations
2.
Clearing shall conform to the requirements of Specifications
301 CLEARING. Topsoil removal shall comply with Topsoil Removal
Clauses of Specification 302 EARTHWORKS.
Clearing
3.
Drains shall be excavated to provide an even grade with no
obstructions or hollows which would impede the flow of water.
Drain
Gradient
4.
Drains, levees and drainage basins shall be constructed to
conform to the cross-sections and levels as shown in the Drawings, and
shall be neatly finished to a standard obtainable with blade grader
operations.
Standard
5.
Batter slopes shall comply with the Finishing Of Batters And
Ground Surfaces Clause of Specification 302 EARTHWORKS.
Batter Slope
6.
Material excavated from drains and drainage basins, which
conforms to the requirements for embankment material as specified in
Specification 302 EARTHWORKS may be utilised to construct levees or
as fill material more than 150mm below the subgrade surface.
Excavated
Material
MAIN ROADS Western Australia
Contract xxx/xx
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
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402.27
TABLE DRAINS (INCLUDING TYPE E)
1.
Table drains shall be constructed during excavation works
as detailed in Specification 302 EARTHWORKS and to the profiles and
levels as shown on the Drawings.
Shape
2.
Batter slopes at culvert and bridge sites shall be smoothly
transitioned over a length of 10m to match culvert wingwall or abutment
wall slopes.
Batter
Slopes
3.
The invert of the table drain shall be within 50mm vertically
and 100 mm laterally of the position shown in the Drawings.
Tolerances
4.
Where indicated on the Drawings, shall be lined with rock
protection as specified in Specification 406 ROCK PROTECTION,
placed to the dimensions, shape and extent as shown on the Drawings
Rock
protection
5.
Where specified on the Drawings, rock protection shall be
mortared in place as specified in Specification 406 ROCK
PROTECTION.
Mortar
402.28
402.28 01
TABLE DRAIN BLOCKS AND DROP STRUCTURES
GENERAL
1.
Table drain blocks and drop structures shall conform to the
location, cross-section and levels as shown in the Drawings. Table
drain blocks and drop structures shall be installed level and within 50mm
vertically and 100mm laterally and longitudinally of the position shown
on the Drawings.
Tolerances
2.
Where indicated on the Drawings, table drain blocks shall be
lined with rock protection as specified in Specification 406 ROCK
PROTECTION, placed to the dimensions, shape and extent as shown
on the Drawings.
Rock
Protection
3.
Where specified on the Drawings, rock protection shall be
mortared in place as specified in Specification 406 ROCK
PROTECTION.
Mortar
402.28.02
TABLE DRAIN BLOCKS USING NATURAL MATERIALS
1.
Suitable material excavated from earthworks operations or
drains or from borrow pits may be utilised to construct table drain
blocks.
Material
Source
2.
Compaction of table drain blocks shall be as specified for
embankment construction in Specification 302 EARTHWORKS.
Compaction
MAIN ROADS Western Australia
Contract xxx/xx
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
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402.28.03
TABLE DRAIN DROP STRUCTURES
1.
Table drain drop structures shall be constructed to the
requirements of clause 402.06.
402.29
Concrete
OFFSHOOT DRAINS (TYPE A)
1.
Offshoot drains and diversion drains shall be constructed as
shown on the Drawings or as required to direct water away from table
drains or other works.
402.30
SIDE DRAINS (TYPE B)
1.
Side drains shall be constructed in accordance with the
requirements of Specification 302 EARTHWORKS and as shown on the
Drawings.
402.31
CATCH DRAINS (TYPE G)
1.
Catch drains shall be constructed in accordance with the
requirements of Specification 302 EARTHWORKS and as shown on the
Drawings.
402.32
SPOON DRAINS
1.
Spoon drains shall be constructed as and where shown on
the Drawings.
Locations
2.
The base of the excavation for spoon drains shall first be
shaped and compacted as specified for embankment foundation in
Specification 302 EARTHWORKS.
Shaping &
Compaction
3.
Spoon drains shall be rock protected as specified in
Specification 406 ROCK PROTECTION.
Rock
Protection
4.
Rock protection work shall be mortared in place as specified
in Specification 406 ROCK PROTECTION.
Mortar
402.33
CULVERT DRAINS (TYPE F)
1.
Culvert inlet and outlet drains shall be constructed as shown
on the Drawings and shall be neatly finished to a standard obtainable
with blade grader operations.
402.34
LEVEES
1.
Levees shall be constructed as shown on the Drawings
MAIN ROADS Western Australia
Contract xxx/xx
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
Construction
Page 7 of 11
2.
Suitable material excavated from drains or material from
borrow pits which conforms to the requirements for embankment
material as specified in Specification 302 EARTHWORKS may be
utilised to construct levees.
Material
Source
3.
The parallel levees associated with side drains, diversion
drains, catch drains and other levees shall be neatly trimmed to conform
to the shape and levels shown on the Drawings.
Type A, B &
G
4.
All levees, including parallel levees associated with diversion
drains and side drains, shall be constructed and tested as specified for
embankment construction in Specification 302 EARTHWORKS except
that three tests per lot shall be carried out.
Compaction
5.
Levees shall be installed within 50mm vertically and
1000mm laterally and longitudinally of the position shown on the
Drawings.
Tolerances
6.
Rock protection to levees shall be constructed as shown on
the Drawings in accordance with the requirements of Specification 406
ROCK PROTECTION.
Rock Lining
402.35
DRAINAGE BASINS
1.
Retention basins, compensating basins, sumps and similar
drainage features shall be excavated and formed to the dimensions,
slopes and levels shown on the Drawings, in accordance with
Specification 302 EARTHWORKS.
Excavation
2.
Suitable material from excavations for drainage basins shall
be incorporated into the Works. Unsuitable material shall be disposed
of to the Contractor’s spoil sites.
Suitability
3.
Associated culverts, balance pipes and culvert headwalls
and similar features shall be constructed in accordance with
Specification 404 CULVERTS.
Associated
4.
Levees associated with drainage basins shall be constructed
in accordance with Section 402.34.
Standard
402.36 – 402.70
NOT USED
AS BUILT AND HANDOVER REQUIREMENTS
402.71 – 402.90
NOT USED
CONTRACT SPECIFIC REQUIREMENTS
402.91 – 402.99
NOT USED
MAIN ROADS Western Australia
Contract xxx/xx
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
Page 8 of 11
SPECIFICATION GUIDANCE NOTES
DELETE THESE NOTES FROM FINAL DOCUMENT AFTER USING FOR
REFERENCE
All edits to downloaded TDP documents shall be tracked (most word processing
software allows this to be done automatically). Deletions shall be struck through e.g.
example. Insertions shall be in italics e.g. example. If all information relating to a clause
is deleted then the clause number should be retained and the words "NOT USED"
should be inserted.
The proposed documents with tracked changes shall be submitted to the Project
Manager for review, prior to printing the final batch of documents. When this final
printing is carried out, the tracked changes option is to be turned off.
The Custodian of this specification is the Senior Road Engineer (Rural).
1.
TOPSOIL OPERATIONS – refer to Clause 402.91 below
1.1
This Specification has been developed on the basis of no re-spreading of
topsoil in drains in order to discourage vegetation re-growth. On some projects it may
be desirable to re-spread topsoil, and the Author should include Clause 402.91 if this
activity is required.
2.
LANDSCAPING FOR DRAINAGE BASINS – refer to Clause 402.92 below
2.1
Any specialised landscaping treatment required in association with the
construction of drainage basins, drainage sumps, etc. should be included, with suitable
references made to Specification 304 REVEGATION AND LANDSCAPING.
2.2
Such work may include the placing of specialised materials such as silts and
clays for the retention of water to promote vegetation and fauna species, planting, and
other features. Reference should always be made to the Environment Branch for
assistance in this area.
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Contract xxx/xx
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
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CONTRACT SPECIFIC REQUIREMENTS TO ADD OR DELETE
The following clauses are to be placed under CONTRACT SPECIFIC
REQUIREMENTS as required.
402.91
TOPSOILING IN DRAINS
1.
Topsoil shall be spread in table drains to the extent shown in
the Drawings.
2.
Topsoil spreading shall comprise the re-spreading of
suitable topsoil stockpiled from topsoil removal operations, or the
spreading of imported topsoil, or a combination from both sources, as
provided for in Specification 302 EARTHWORKS.
Source of
Topsoil
(plus other text as required)
402.92
LANDSCAPING FOR DRAINAGE BASINS
1.
Drainage basins and similar drainage features shall be
landscaped to the extent shown on the Drawings.
2.
Landscaping shall be in accordance with the requirements of
Specification 304 REVEGATION AND LANDSCAPING.
(plus other text as required)
Note – Add Specification 304 REVEGATION AND LANDSCAPING to
references at Clause 402.02.
MAIN ROADS Western Australia
Contract xxx/xx
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
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SPECIFICATION AMENDMENT CHECKLIST
Specification: No: 402 Title: SURFACE DRAINS AND LEVEES Dated: ________
Project Manager: Name: _______________Signature: ______________Date:______
Checked by: Name: _______________Signature: _______________Date:______
Contract No: _______Contract Description: __________________________________
ITEM
DESCRIPTION
SIGN
OFF
Note:
All changes/amendments must be shown in Tracked Change mode until
approved.
1.
Project Manager has reviewed Specification and identified
Additions and Amendments.
2.
CONTRACT SPECIFIC REQUIREMENTS addressed? –
Contract specific materials/products/clauses added? (Refer
Specification Guidance Notes for guidance).
3.
Any unlisted Materials/Products proposed and approved by the
Project Manager? – if “Yes” provide details at 15.
4.
Standard Clauses amended? – MUST SEEK approval from
MCP.
5.
Clause deletions shown as ‘NOT USED’.
6.
Appropriate INSPECTION & TESTING parameters included in
Spec 201 (Test Methods, Minimum Testing Frequencies
verified).
7.
ANNEXURES completed (Refer Specification Guidance Notes).
8.
HANDOVER and AS BUILT requirements addressed.
9.
Main Roads QS has approved changes to SMM.
10.
Project Manager certifies completed Specification reflects intent
of the design.
11.
Completed Specification – independent verification arranged by
Project Manager
12.
Project Manager’s review completed.
13.
SPECIFICATION GUIDANCE NOTES deleted.
14.
TABLE OF CONTENTS updated.
15
Supporting information prepared and submitted to Project
Manager.
Further action necessary:
Signed:
MAIN ROADS Western Australia
Contract xxx/xx
(Project Manager)
Date: _______________
Specification 402 Surface Drains and Levees
Document 04/10102 Issue 10/07/08
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