RIVER EROSION REPAIR - GW · RIVER EROSION REPAIR Details contained in this document have been prepared to offer assistance to GWRC staff and Contractors. The techniques and plans

BEST PRACTICE GUIDE VERSION # 1 – APRIL 2013

RIVER EROSION REPAIR

Details contained in this document have been prepared to offer assistance to GWRC staff and Contractors. The techniques and plans contained in this Guide have been prepared and included on the basis of the information accumulated by GWRC and the experience of GWRC staff over many years in undertaking and supervising repair work. This is made available to offer assistance to rural landowners who experience erosion and are considering whether or not to undertake repairs. The guidelines and plans have been compiled to deal with common or standard situations. Landowners are cautioned against using the guidelines and plans in circumstances which may not be common or standard and are advised to seek professional assistance if in doubt or where there has been significant erosion. While GWRC has endeavoured to ensure the guidelines and plans are a fair statement of the best practice derived from experience, it cannot assume responsibility to any third party for the reliability, accuracy or completeness of the information or plans contained in this Guide or of the applicability of either to any particular circumstances. In areas of significant erosion, detailed engineering investigation / design may be required.

COVER SHEET Drawings included within :

• Staggered Concrete Blocks with Rail Iron Anchors & Inter-planted with Willows Dwg Ref :RL-5317/12

• Rail Iron Debris Fence Dwg Ref :RL-5317/13

• Rail Iron Debris Fence with Rock Head Dwg Ref :RL-5317/14 to RL-5317/16

• Permeable Groyne Dwg Ref :RL-5317/17

• Rock Groyne (160, 350, 500 & 650 Tonne) Dwg Ref :RL-5317/18 to RL-5317/22

• Concrete Block (Core) Groyne Dwg Ref :RL-5317/23

• Rock Lining Dwg Ref :RL-5317/24

• Rock Lining with Varied Batter Dwg Ref :RL-5317/25

• Gabion & Groyne Barb Dwg Ref :RL-5317/26 to RL-5317/28

• Rock Rip Rap Grading Envelope (Dwg Ref :RL-5317/29)

• GWRC Survey Mark Installation Dwg Ref :RL-5317/30 & /31

• Typical Concrete Block Cabling Detail Dwg Ref :RL-5317/32

For latest version guide, contact Greater Wellington Regional Council Flood Protection Department

For more information, contact Greater Wellington:

PO Box 11646 Manners Street

Wellington, 6141 T 04 384 5708 F 04 385 6960

April 2013

File N//50/03/07 v1

e-doc #1178292

www.gw.govt.nz [email protected]

FILE N/50/2/6 Cad: RL-5317_C.dwg

greater WELLINGTON REGIONAL COUNCIL

Te Pane Matua Taiao

EROSION REPAIR RIVER

STANDARD DETAIL STAGGERED CONC. BLOCKS WITH RAILIRON ANCHORS

VERSION # 1

Heavy duty wire cable. Blow holes in rail after driving so cable can be threaded through. NOTE :

Erosion

Side wire every 2nd Continuous back row wire

Top of bank

1 6m x 0.8m x 0.8m concrete blocks

Continuous diagonal wire rope

■III■ • •■•■ • •

sti)

Wire dogs to each side of block

0

Willow poles planted as work progresses

2.4m centres (Typical.)

0

11.1.1. • •/••••••1 Continuous front wire - • • • • •

Design channel alignment - • • • • •

• Cable size depends on concrete block hole size. Allow for 2 cables through the concrete block.

• Start and finish of spstream and downstream ends with double blocks and tie down with 2 Rail iron anchors.

Refer also drawing # HR-5293 for similar detail.

• Refer to RL-5317 / 02 for willow planting guidelines

Willow poles planted as work progresses

Concrete blocks dug in

10h : 1v sl pe

-- • • 0111„,„ ■P

ONO I /1W417, 11111 1■■■ INV.-460 •1%

swum ' z-rry•

W.L.

Fill with beach metal

70 or 90 lb x 4.5 long rail irons driven flush with downstream face, each row of concrete blocks as shown. Do not tie blocks to rail iron anchors

Scale 1 : 100

Flow

PLAN

70 or 90 lb x 4.5 long rail irons driven flush with downstream face, each row of concrete blocks as shown. Do not tie blocks to rail iron anchors

Li

TYPICAL CROSS SECTION N.T.S.

DISCLAIMER:

GWRC and other agencies involved in the preparation of this plan assume no responsibility as to the reliability, accuracy or completeness of the information shown or for any interpretation or action taken by any agency or individual in relation to information provided on this plan.

This plan has been prepared to offer assistance to rural landowners, the landowner is under no obligation to carry out these works. In areas of significant erosion, detailed engineering design / investigation may be required.

The landowner will need to contact the necessary authorities and service providers for building consent/resource consent (if applicable) prior to any work being carried out. Please note there is always a risk of works being outflanked or destroyed in a flood.

See also caution on cover sheet.

DESIGN COMPILED r 1 2013 DRAWN P.COOK April 2013 CHECKED C. C., ktitrn At 3 1M3 APPROVED ..,61.12e dcl Drawing No. RL-5317 / 12

Hutt River : Sladden Park 25m crs : Moonshine 33m crs : Manor Park 30m crs (Includes rock heads) : Avalon 30m crs (Includes rock heads)



Te Pane Matua Taiao


STANDARD DETAIL Rail iron DEBRIS FENCE

VERSION # 1

• --- • --rrn fITri • - • - • - • - - • -

>4) TYPICAL Rail iron DEBRIS FENCE - PLAN Scale 1 : 200

DETAIL 1 Scale 1 : 40


Refer typical post detail 1 this page

Cut / fill existing ground profile as required, shape to suit 1: 50 fall

(Confirm on site)

T

■•••■

Wire rope join at middle rail iron. Refer detail 2 this page

N Remaining rail irons to be 55Ib and 4.6m long Rail iron centres vary. Hutt River 3m, Otaki River 5m.

0.2m

16mm Wire rope grips

\. =111E111E11

II1E

Railway iron 4 ° - 75°

'>)

0.2m Railway iron

0 ••■•■■k■4Ill••■■•■,.l..■

—era

=111E111E7 :7l-ETTL-=-_-1

IIIE [Ell

Front 2 rail irons to be 70Ib or 90Ib and 6.4m long @ 3m centres.

TYPICAL Rail iron DEBRIS FENCE - ELEVATION Scale 1 : 200

NOTE: 1. Debris fence with rock groyne generally placed every second fence.

Length & spacing varies as site spacific design is required. Typical spacings used in the following areas are :

DISCLAIMER:





CHECKED c,CmciAIN APPROVED

3/$1/3 6102

COMPILED P.COOK

April 2013 April 2013

DESIGN DRAWN

Drawing No. RL-5317 / 13

VERSION # 1

DESIGN DRAWN

COMPILED P.COOK

CHECKED C , C440/0 APPROVED



STANDARD DETAIL Rail iron DEBRIS FENCE WITH ROCK HEAD (TYPE 1 OF 3)


Te Pane Matua Taiao

HI.

1:50 fall (Confirm on site)

Cut / fill existing ground profile as required, shape to suit


DESIGN CHANNEL Refer post detail 1 ALIGNMENT this page

2.6m

eibe■ . lirromme - atat.qteedrIi 116

—

/

650d,0 rock head


TYPICAL RAIL IRON DEBRIS FENCE - ELEVATION Scale 1 : 200

IA Flow

R1m Typ.


Remainin rail irons to be 55Ib and 4.6m long. Rail iron centres vary (Hutt River 3m,

Otaki River 5m)

• — • — • —•—• • — • — • —41 k Varies )1

(Hutt River 3m, Otaki River 5m) 650 d' Rock head



R3m Typ.

ROCK HEAD TYPE 1 - Plan Scale 1 : 200

Rail iron

G.L.

14111114. ZOO Oqba•

11-1 1 1-

1 1 1-1 1 1-

111-1 1

ROCK HEAD TYPE 2 - Section A - A Scale 1 : 200

4%11:

0.2m


II

NZ_

0.2m 0.2m Railway iron Railway iron

In

10.5m

DISCLAIMER:






Glc112 Drawing No. RL-5317 / 14

650d 50 rock head


TYPICAL RAIL IRON DEBRIS FENCE - ELEVATION Scale 1 : 200 DISCLAIMER:





• • •

k Varies )1 (Hutt River 3m, Otaki River 5m)

Flow


Length & spacing varies as site spacific design is required. Typical spacings used in the following areas are : DESIGN CHANNEL

ALIGNMENT : Sladden Park 25m crs : Moonshine 33m crs : Manor Park 30m crs (Includes rock heads) : Avalon 30m crs (Includes rock heads)

Hutt River

R3m Typ.



••■

Refer post detail 1 ALIGNMENT —1 this page

2.6m

DESIGN CHANNEL


Remainin rail irons to be 55Ib and 4.6m long. Rail iron centres vary (Hutt River 3m,

Otaki River 5m)

0.2m

c0


1=111=111, =111E111E11

111E

X—

Railway iron Railway iron ROCK HEAD TYPE 2 - Plan Scale 1 : 200

9m

ROCK HEAD TYPE 1 Section A - A Scale 1 : 200

DESIGN DRAWN

VERSION # 1 EROSION REPAIR COMPILED

P.COOK April 2013 April 2013

CHECKED C c atuff4

In

3 '2

RIVER STANDARD DETAIL

RAIL IRON DEBRIS FENCE WITH ROCK HEAD (TYPE 2 OF 3) Drawing No. RL-5317 / 15 FILE N/50/2/6 Cad: RL-5317_C.dwg


Te Pane Matua Taiao

APPROVED


Te Pane Niatua Taiao


STANDARD DETAIL RAIL IRON DEBRIS FENCE WITH ROCK HEAD (TYPE 3 OF 3)

VERSION # 1

Refer post detail 1 this page DESIGN CHANNEL

ALIGNMENT


Rim Typ. Varies

(Hutt River 3m, Otaki River 5m)


1 E E

=111--g .=111ffig 1=111=111= 1=111=111=


Bottom wire 200mm below ground level


ROCK HEAD TYPE 3 - Section A - A Scale 1 : 200



Remaining rail irons to be 55Ib and 4.6m long. Rail iron centres vary (Hutt River 3m,

Otaki River 5m)



Rail iron

LC)

\/

X E

41_10/1 •M* APrilippireMPWIKTOI

Ilineg ,


650 d 50 Rock head

TYPICAL RAIL IRON DEBRIS FENCE - ELEVATION Scale 1 : 200

R3m Typ.

ap()■0■111. 011■0■610


1)-

45°

ROCK HEAD TYPE 3 - Plan (as used in Avalon Park HR-5234) Scale 1 : 200

3m

9m

DISCLAIMER:





April 2013 April 2013 315-113

APPROVED 6/ Drawing No. RL-5317 / 16

Cad: RL-5317_C.dwg

DESIGN DRAWN P.COOK

COMPILED

CHECKED C C. NtAA.141A

FILE N/50/2/6

DISCLAIMER:




See also caution on cover sheet. 3m 3m centres typ.

to river bank

M12 Galv. 'U' bolt with 50mm x 50mm x 5mm galv. washer

PLAN Scale 1 : 50

200mm x 100mm Tanalised timber rails

0 0

70 lb Railway iron or similar approved. 6m long front Iron, 4.8m for the rest

ELEVATION - (View looking Downstream) Scale 1 : 50

DESIGN COMPILED April 2013 DRAWN CHECKED APPROVED

VERSION # EROSION REPAIR April 2013 3 )3 1:,(5.C311

FIE N/50/2/6 Cad: RL-5317_C.dwg


Te Pane Matua Taiao

1


PERMEABLE GROYNE

P.COOK

Drawing No. RL-5317 / 17

Set-out point

Class C grade rock

R4.75m

New rock groyne

Bed level 1.5

Ground level

4m

Crest level

River gravel backfill

SECTION A - B Scale 1 : 200

New rock groyne

W.

DISCLAIMER:




NOTE:

Groyne spacing is a judgment call depending on factors such as tightness of the bend, stream gradient and bank material etc. A general rule of thumb is : Groyne spacing = 1.5 x the distance between Erosion face and preferred channel alignment.

Typical groyne spacings that have been used are : Hutt River : Nash Street 60m crs

: Belmont 70m crs : Bridge road 50m crs : Ava - Ewen 78m crs

Waikanae River : 45 - 70m crs (generally on bends) Otaki River : 50m crs


Rim 4m

et-out point

1< PLAN Scale 1 : 200

Approx fill profi groynes

le between

April 2013 VERSION # 1 EROSION REPAIR DESIGN COMPILED

DRAWN P. CO OK

April 2013


Te Pane Matua Taiao


ROCK GROYNE (160 TONNE)

CHECKED C C ivtietAtki 3 C APPROVED Cl Drawing No. RL-5317 / 18 FILE N/50/2/6 Cad: RL-5317_C.dwg

R6m

New rock groyne Approx. fill profile between

groynes

Design channel / preferred cannel aignment

PLAN Scale 1 : 200

R1.5m

Set-out point

6m

Set-out point

15°

Class C grade rock

I Ca

EI

-,icid.g) a c,,,T3

15 6m 1.5

30 Bed level

Ground level

Crest level W.L.


NOTE:

Groyne spacing is a judgment call depending on factors such as tightness of the bend, stream gradient and bank material etc. A general rule of thumb is : Groyne spacing = 1.5 x the distance between erosion face and preferred channel alignment.


: Belmont 70m crs : Bridge road 50m crs • Ava - Ewen 78m crs

Waikanae River

45 - 70m crs (generally on bends) Otaki River 50m crs

DISCLAIMER:





SECTION A- B New rock Scale 1 : 200 groyne

DESIGN DRAWN




Te Pane Matua Taiao



CHECKED APPROVED .....--61-1042 6( c") a Drawing No. RL-5317 / 19 FILE N/50/2/6 Cad: RL-5317_C.dwg

C. C. /111.01Arl 3/513 13

>I Plant willows between groynes

W.L.

21.5m

1.5

NOTE: 1. Refer to RL-5317 / 02 for willow planting guidelines

2. Groyne spacing is a judgment call depending on factors such as tightness of the bend, stream gradient and bank material etc. A general rule of thumb is : Groyne spacing = 1.5 x the distance between erosion face and preferred channel alignment.


: Belmont 70m crs : Bridge road 50m crs : Ava - Ewen 78m crs 1m

Waikanae River : 45 - 70m crs (generally on bends)

Otaki River : 50m crs

4m

15m

10m

Set-out point

DISCLAIMER:



The landowner will need to contact the necessary authorities and service providers for building consent! resource consent (if applicable) prior to any work being carried out. Please note there is always a risk of works being outflanked or destroyed in a flood.

Refer also caution on cover sheet.

'4WIVA 1/1 1/ 4

/ • \

Set-out point

r-- Lo.

-

I o - • C ' eo

Class C grade rock

R7.25m

New rock groyne

PLAN Scale 1 : 200

Design channel / preferred channel alignment

Approx. fill profile between groynes

17m

Ground level Approx. fill profile between groynes

Class C grade rock 30

0 R., (optional) E — Bed level co E

— Crest level

Age" .;i1 ■■ ■ ■

Class B grade rock

Optional - Place rows of 1.6m x 0.8m x 0.8m concrete blocks to fill void and provide suitable platform for rock


SECTION A- C scale : 200

4.5m 4m 4.5m

Class C grade rock

1.5 Ground level

Class B grade rock

13m

4040,0:0,4•••, „A/Arse-4'0,4,ft_

1.5

1.5

iv 7.5m

N-


2.25m 3m 2.25m

SECTION AT A Scale 1 : 200

Optional - Place rows of 1.6m x 0.8m x 0.8m SECTION AT C concrete blocks to fill void and provide suitable Scale 1 : 200 platform for rock

DESIGN DRAWN

VERSION # 1 EROSION REPAIR COMPILED April 2013

P.COOK April 2013 CHECKED greater WELLINGTON

REGIONAL COUNCIL

Te Pane Matua Taiao



31s11 APPROVED q/.42 61c))1 Drawing No. RL-5317 / 20

CC M KArg

WI

Cad: RL-5317_C.dwg FIE N/50/2/6

Approx. fill ground profile between groynes

1 0 0 0 0

15000

22250

2.25m 3m 2.25m

1.5 1.5

7.5m

Ground level

Lo.

4m 5.25m X

SECTION A - C Scale 1 : 200

5.25m River gravel backfill

DISCLAIMER:



The landowner will need to contact the necessary authorities and service providers for building consent/ resource consent (if applicable) prior to any work being carried out. Please note there is always a risk of works being outflanked or destroyed in a flood.

Refer also caution on cover sheet.


2. Groyne spacing is a judgment call depending on factors such as tightness of the bend, stream gradient and bank material etc. A beneral rule of thumb is : Groyne spacing = 1.5 x the distance between, erosion face and preferred channel alignment.



Waikanae River : 45 - 70m crs (generally on bends)

Otaki River : 50m crs

15m

4m 10m JI

, Set-out point

New rock groyne

7\-- E 15°

C•1

-X--

R7.25m

PLAN Scale 1 : 200

grade rock Class C

Arr

17m



Set-out point

Class C Class B grade rock rade rock N .

Fill void with gravel material from riverbed

Plant willows between groynes (optional)

Ground level

30 Bed level Crest Level 1.5


'Aff;a1A legialirallifialM111.111011

-111111111111111111111111111111111.111all 111111111111 1

12 Optional - Place rows of 1.6m x 0.8m x 0.8m concrete blocks to fill void and provide suitable platform for rock

New rock groyne

Class C grade rock

Class B Grade Rock

SECTION AT A Scale 1 : 200

SECTION AT C Optional - place rows of 1.6m x 0.8m x 0.8m Scale 1 : 200 concrete blocks to fill void and provide suitable platform for rock

14.5m

VERSION # EROSION REPAIR DESIGN DRAWN 1

COMPILED P.COOK

April 2013 April 2013 3/ 51 I

APPROVED



Te Pane IVIatua Taiao


ROCK GROYNE (650 TONNE) Drawing No. RL-5317 / 21

CHECKED C C ittRAY4


New rock groyne

10m

R6.5m

Set-out point

Optional - Place rows of 1.6m x 0.8m x 0.8m concrete blocks to fill void and provide suitable platform for rock

Crest level

Plant willows between groynes (optional) Bed level

1.5

< Class C grade rock

(

Class B grade rock


Ground level

>I

10m

10m 15m River gravel backfill


2. Groyne spacing is a judgment call depending on factors such as tightness of the bend, stream gradient and bank material etc. A general rule of thumb is : Groyne spacing = 1.5 x the distance between erosion face and preferred channel alignment.




DISCLAIMER:





1 0m 15m

R2.5m

u_


PLAN Scale 1 : 200

1.5m 17m

25m

SECTION A - C Scale 1 : 200

I DESIGN DRAWN




Te Pane Matua Taiao


ROCK DEFLECTING GROYNE (750 TONNE)

CHECKED CCfrfw4 APPROVED Drawing No. RL-5317 / 22 FILE N/50/2/6 Cad: RL-5317_C.dwg

1.6m x 0.8m x 0.8m Concrete block core cabled together with continuous wire rope throught lifting eyes. Slope 30 : 1 and angled 15° - 45° downstream Design channel / preferred

channel alignment Approx. fill profile between groynes Class C grade rock

topping

DISCLAIMER:



The landowner will need to contact the necessary authorities and service providers for building consent /resource consent (if applicable) prior to any work being carried out. Please note there is always a risk of works being outflanked or destroyed in a flood.


Plant willows between groynes

90° Groyne angled

15° - 45° d/s in direction of flow


2. Groyne spacing is a judgment call depending on factors such as tightness of the bend, stream gradient and bank material etc. A general rule of thumb is : Groyne spacing = 1.5 x the distance between erosion face and preferred channel alignment. PLAN

Scale 1 : 200

First row of blocks dug into bed below scour level




0.8m to 1m above low flow water level and founded 1m to 1.5m 1.5 below scour level

Top of groyne to be Class C grade rock topping . a

E Crest level co

W.L.

ci.


TYPICAL SECTION Scale 1 : 100

Concrete block core (1.6m x 0.8m x 0.8m)

2.5m Min.

DESIGN COMPILED DRAWN P.COOK

VERSION # 1 EROSION REPAIR April 2013

April 2013


Te Pane Matua Taiao


CONCRETE BLOCK CORE GROYNE

CHECKED

M4AAN APPROVED — 61C10 Drawing No. RL-5317 / 23 FILE N/50/2/6 Cad: RL-5317_C.dwg

Work platform 5m

Finish exposed surface with 200mm thick topsoil, sow grass

Lining thickness = 1.5 x d50 (2.5 x d50 for high velocities) or lm for Rip Rap

TYPICAL SECTION - (Low Velocities) Scale 1 : 200

Rip rap / rock lining to suit

Key rock into existing bank

Top of bank

Rock line crest

Foundation profile

Direction of flow

ROCK LINING PLAN - End Return and Snub Groyne Scale 1 : 500

45°

/ Design channel /2referred channel / alignment

444k' ri/sot

r4104%. '1411 1

laP4 ■

Crest level

=_ Backfill from river bed


River bed W.L. or M.H.W.S. (Low flow water level)

Finished profiles (min. and max limits)

— 5: 1•

Lq Selected filter material

Rip Rap / rock lining to suit

TYPICAL SECTION - (High velocities) Scale 1 : 200

Notes : 1.d50 denotes average rock diameter 2. Ensure upstream end of rockline has a 45° return keyed lm

Min. into existing bank. 3. Snub groyne to be constructed on the downstream end.


c`!

Crest level I 00.1

V— Finished profiles (Min. and max limits)

Backfill from river bed

Selected filter material

W.L. or M.H.W.S. (Low flow water level)

9.6m

Work platform 5m

Finish exposed surface with 200mm Thick topsoil, sow grass

River gravel backfill River bed

DISCLAIMER:






STANDARD DETAIL ROCK LINING

A ril 2013 P.COOK C AltiAMA

rfiL- IIII'PE021013

DESIGN DRAWN CHECKED APPROVED Drawing No. RL-5317 / 24 FILE N/50/2/6 Cad: RL-5317_C.dwg

VERSION # 1


Te Pane Matua Taiao

COMPILED April 2013 DESIGN


Te Pane Matua Taiao


STANDARD DETAIL ROCK LINING (Varied batter / River Access)

DRAWN P.COOK April 2013 CHECKED C,c A/1(4.0%FM 3fs-i "; APPROVED .„--C-I402' 61C113 Drawing No. RL-5317 / 25 FILE N/50/2/6 Cad: RL-5317_C.dwg

VERSION # 1

50 Crest level

Width = 1.5 x d50 (2 x d50 for high velocities) or lm for Rip Rap SECTION (4h : 1v Batter)

Scale 1 : 200 Hor. & Vert.

9' 9' 1. 9' 9'

Rockline crest

Rock lining face

1.5h : 1v BATTER 12.5m TRANSITION

River Flow

12.5m TRANSITION 1.5h : 1v BATTER

Hatch denotes backfill as required

Rock lining Footing

Approx. Top of bank

9'

Rockline crest

Rock lining footing

1-= 0 LU

u) 0 a_

in I

1 Om or length to suit 4h : 1v BATTER

DESIGN CHANNEL

Rock lining face

PLAN Scale 1 : 250

N otes:

1.

Dimensions are shown in mm unless stated otherwise.

2. Batter slope varies to provide variation in habitat conditions

Finish exposed surface with 200mm thick topsoil, sow grass

Existing ground profile

Backfill & filter material as specified

W.L. or MHWS (Low flow water level)

V 4 _ _ — 1.5 "Mit ritelgrralft% ,

• A,- vvivrw eabriernsm.f...

Rock / Rip Rap lining (Class A)

(NI

co DE

SIG

N C

HA

NN

EL

Width = 1.5 to x d50 (2 x d50 for high velocities) or lm for Rip Rap

7

3. Place a suitable rooting medium over the riprap and revegetate with suitable species as soon as possible after vegetation is destroyed and soil washed away particularly where whitebait spawning occurs.

4. Refer also to the waikanae river environmental strategy (version 3)

5. Refer to drawing RL-5317 / 24 for typical rock / rip rap lining dimensions & profile

DISCLAIMER:



The landowner will need to contact the necessary authorities and service providers for building consent /resource consent (if applicable) prior to any work being carried out. Please note there is always a risk of works being outflanked or destroyed in a flood.


VERSION # 1

DESIGN DRAWN

COMPILED P.COOK



STANDARD DETAIL GABIONS - Sheet 1 of 3


Te Pane Matua Taiao

Side diaphragm

Biodegradable string to hold willows in place

Single loop lacing

Longitudinal cables Front (river side)

Pin made from D16 reinforcing bar 0.75m long pushed into fill to hold down fencing wire

Back

Longitudinal cable

Diagonal cable

3.7m irons

VIEW 1 RIVER BED LEVEL NOT SHOWN N.T.S.

Shade cloth

÷- Live cable

Rail iron

ANCHOR DETAIL N.T.S.

5.5m irons

4.6m Irons

Plant line of willow poles at 1.5m centres. Ensure willow poles are embedded a min of 0.5m into river bed

025mm to 30mm0

_ - -

Silt

Strained fencing wire

Shade cloth Willow plantings

River gravel

100mm Growing medium (silt)

Longitudinal cable

Double loop lacing

Bottom mesh (Mesh front & bottom faces only)

SKETCH SHOWING DIAPHRAM Rail ironS CABLE and WILLOW PLACEMENT DETAILS

N.T.S. — _

based on 6.51-nidth o W

OVERLAP DETAIL N.T.S.

5.0rn

Refer overlap detail

ellre471:‘4! 444;11111

Imported weathered greywake

TYPICAL LACING DETAIL DOUBLE LOOP LACING

N.T.S.

TYPICAL LACING DETAIL SINGLE LOOP LACING

N.T.S.

Railway iron posts. Base to be on bank side offence. Gas cut 25-30mm diameter hole in web for longitudinal cables

PLAN N.T.S.

Mesh to be laced to every third post " using single loop lacing through alternate netting links. lacing tied off around top and bottom cable

Longitudinal cables to be tied off at 50m intervals onto rail irons, with two galvanied 13mm wire rope grips @ 0.2m spacings. refer detail

Railway iron post

River side

TYP LONGITUDINAL CABLE JOINING DETAIL

N.T.S.

0.2m

Basket side Cable grips

TYPICAL SHADE CLOTH DETAIL N.T.S.

Willow plantings

Diagonal rail iron braces

1)7

SKETCH SHOWING GABION END DETAIL DOWN STREAM END OF WALL

N.T.S.

TOP OF RAIL DETAIL N.T.S.

Back fill —›

Single loop lacing for diaphragm (every third iron)

Rail iron and GABION BASKET CROSS SECTIONAL DETAIL

N.T.S.

Grass

Refer / anchor / detail I

Longitudinal cable

single loop lacing

Every Diagonal cable rthird Wire mesh diaphragm J iron

Single loop lacing for front Design face and diaphragm NWL

River bed

'Double loop lacing

Fill depression with silt

Each end of roll of chainlink mesh to form a continuous length of mesh by removing last wire and knitting into end of roll

Longitudinal cables

Design NWL

V River bed

Groyne barb (optional Refer drawing HR-5317 / 27 for details

Backfill. Refer detail above

Rail iron TYPICAL RIVER CROSS SECTION

N.T.S.

1.2m

Shade cloth

Willow plantings

Gabion basket. Rocks from beaches

Shade cloth and grass with plantings

Round off sharp edge

DISCLAIMER:





NOTES:

• All braces to be formed using 55Ib rail irons and welded in place

• Refer also HR-5317 / 28 for general notes.

_April 2013 April 2013

CHECKED Ce whAikft,1 APPROVED 6193 Drawing No. RL-5317 / 26

1.5m

thi

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App

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top

o f b

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Set-out point Set-out

point

NOTES:

• Refer to HR-5317 / 28 for general notes.

• Refer to HR-5317 / 26 for gabion details

DISCLAIMER:





14.5m

SMALL GROYNE (BARB) - Plan Scale 1 : 200

LARGE GROYNE (BARB) - Plan Scale 1 : 200

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LARGE GROYNE (BARB) - Elevation Scale 1 : 200

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April 2013

3/ 511; bK. cs

Approx. top of bank

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Finished W.L.

VERSION # 1

DESIGN DRAWN EROSION REPAIR


GROYNE BARB Sheet 2 of 3

COMPILED April 2013

CHECKED C c kt t, APPROVED Drawing No. RL-5317 / 27 FILE N/50/2/6 Cad: RL-5317_C.dwg


Te Pane Matua Taiao

P.COOK uh4

NOTES:

GENERAL

• All dimensions in millimeters unless noted otherwise

RAILWAY IRONS

• All railway irons to be in good condition and without significant corrosion

• Railway irons to be founded with no more than 200mm cut off for driving head damage

• All railway irons to be driven within 100mm of location shown on the drawing and shall be within a vertical tolerance of 1:50

• Top of the Railway irons to be uniform grade between set out levels

CABLES

• Cables shall be 14mm or 12mm 0 galvanised wire rope

• The three longitudinal cables shall be passed through holes in the web of each iron and tied off at every 50m as shown in the details RL-5317 / 27

• Diagonal cables shall be placed every 3m (at the same location as mesh diaphragms).

• All cable tie-offs shall be made using two galvanised steel wire grips.

• Cables shall be tensioned and tied off such that all kinks or curvature in the wires are straightened out and so that they do not deflect under moderate hand pressure between points of support

MESH and LACING WIRE

• All mesh to be used shall be 75mm mesh size, 2.5mm galvanised wire core, 3.6mm of green plastic coated chain-link.

• The end of roll of chain-link mesh is to have the end wire removed and knitted into the next so that it forms a continuous length.

• All lacing wire shall be 2.2mm galvanised wire core, 3.2mm of green plastic coated wire.

• Ends of all lacing to be tied off around a railway iron or cable (no intermediate joins), use fencing knots.

• Front mesh to be tied to the longitudinal cables using double loop lacing through every netting link.

• Front mesh and diaphragms to be tied to every third rail iron (at same location as diagonal cables) using single loop lacing through alternate netting links.

• Top mesh to be tied to the longitudinal cables and top of each diaphragm using single loop lacing

WILLOW POLES

• 2.5m - 3.0m Matsudana willow poles are to be tied to the top longitudinal cable at the rear of the gabion basket at 1.5m centres using biodegradable string prior to back filling.

• Poles are to be founded so the base is embedded at least 0.5m below water.

SHADE CLOTH

• Shade cloth to be used is super hailtex.

• Cloth is to be laid length-wise along the works with 0.5m of the end of each 6.5m wide roll fixed as shown in the diagram. The end of each roll is to be overlapped on on top of the downstream roll by at least lm.

DISCLAIMER:






Te Pane Matua Taiao

REFER TO HR-5317 / 25 and / 26 FOR DETAILS VERSION #

1


GABIONS - General Notes (Sheet 3 of 3)

EROSION REPAIR

• Each roll of shade cloth shall be pinned down along the the centre of the roll using strained fencing wire pinned down at 30m intervals using 750mm long pins formed from D16 reinforcing steel as detailed on drawing RL-5317 / 20.

DESIGN

COMPILED April 2013 DRAWN

P.COOK April 2013 CHECKED

C MtitAANI APPROVED .....re„geo Drawing No. RL-5317 / 28 FILE N/50/2/6 Cad: RL-5317_C.dwg

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P .C OOK April 2013 C HEC KED e CM 31s- p5

greater WELLIN GTON RIVE R APPROVE D ,.„„21/12R 61qa STAN DARD DETAIL

REG IONAL COU NCI L Dra wi ng N o. RL -53 17 / 29

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PLAN N.T.S.


3/5/13 6/5/13

Drawing No. RL-5317 / 30 FILE N/50/2/6 Cad: RL-5317_C.dwg

DESIGN DRAWN

COMPILED P.COOK

CHECKED APPROVED

C. MUNN G.A.C.

105

100

THE WELLINGTON REGIONAL COUNCIL

URVEY MARK

8

8

PLAQUE DETAIL N.T.S.

NOTES: 1. Dimensions in millimetres (mm) 2. Existing plaques can be reused if not damaged 3. Plaques to be manufactured from certified gunmetal

ingot, LG 2 to BS1400 4. Crystalline structure of final plaque to be suitable for

marking by indenting punch 5. Lettering and marking box to be smooth ground 6. Plaques to be drilled with 2 No. 6.5mm 0 holes 7. Minimum lettering height 7mm 8. Refer also to A4-8170 / 01-RC and 02-RC &

HR-5310 / 05 for similar details

LO

4

4 4

LI 4

4

Concrete block to be poured in-situ

wismoW

25mm 0 Galvanised water pipe 600mm long driven into solid ground

NOTES: SECTION

1) Refer to RL-5317 / 31 for areas of pedestrian access N.T.S.

2) Refer also to A4-8170 / 01-RC and 02-RC & HR-5310 / 05 for similar details


Te Pane Matua Taiao

VERSION # EROSION REPAIR 1

STANDARD DETAIL - GWRC SURVEY MARKS CONTROL / SIGHTING POINTS INSTALLATION DETAILS

AREAS OF NO PEDESTRIAN ACCES

8 )(

<

--

16-

350 x 350

Stainless Steel Pin

25mm Asphaltic Concrete

4.

Formed surface

4


. , •

- 4 4

A

Asphaltic Concrete Pathways N.T.S.

VERSION # 1

105 350

100

/N Formed surface

4.

NZ_ • '41

• - 4

.• d . • . 4


4 D16 Reinforcing

THE WELLINGTON REGIONAL COUNCIL 01 0

URVEY MARK

8

PLAQUE DETAIL N.T.S.

S.S. Pin G.I. or

4.

4

4 4

\

..■

a

4.

•

LU Pipe

Brass ,,L7ALLTOT„Ti. • name plate. (Refer detail left)

o • SURVEY 1.4:44

- A 4 /

NOTES: 1. Dimensions in millimetres (mm) 2. Existing plaques can be reused if not damaged 3. Plaques to be manufactured from certified gunmetal

ingot, LG 2 to B51400 4. Crystalline structure of final plaque to be suitable for

marking by indenting punch 5. Lettering and marking box to be smooth ground 6. Plaques to be drilled with 2 No. 6.5mm 0 holes 7. Minimum lettering height 7mm 8. Refer also to A4-8170 / 01-RC and 02-RC &

HR-5310 / 05 for similar details

350 x 350

750 x 600 Wide

PLAN N.T.S.

Heavy duty cast iron hydrant box cover and frame with split lid to NZS 750 1984

Concrete surround in berms

Cast iron hydrant box

25mm 0 Galvanised water pipe 600mm long driven into solid ground

Grassed Areas / Access Ways N.T.S.

A .4.

4

• . 3:000,

10,

4

— — — — — 150mm Compacted Basecourse

4 a 4

EROSION REPAIR STANDARD DETAIL - GWRC SURVEY MARKS

CONTROL / SIGHTING POINTS INSTALLATION DETAILS PEDESTRIAN ACCESS AREAS

DESIGN COMPILED April 2013 DRAWN P.COOK A ril 2013 CHECKED C. MUNN 3/5/13 APPROVED G.A.C. 6/5/13 Drawing No. RL-5317 / 31 FILE N/50/2/6 Cad: RL-5317_C.dwg

(?)


Te Pane Matua Taiao

Bottom 16mm Dia. continuous wire rope SECTION A - A

Scale 1 : 50

Wire grips on wire rope at end of each tier of concrete blocks to stop movement

I I I 1 I I I I

Start \ here \

1.6m x 0.8m x 0.6 m Concrete blocks

I 1

DISCLAIMER:


This plan has been prepared to offer assistance to rural landowners, the landowner is under no obligation to carry out these works. In areas of significant erosion, detailed engineering design /investigation may be required.



I I I I I I

ii 411

Continuous 16mm Dia. wire rope looped back on each line of blocks

PLAN Scale 1 : 50

I \ Finish here Wire grips on wire rope

Short 16mm Dia. wire rope tying concrete block layers together

rI;'.

.

V. I TA ■MIMIIVIIV111.211 —.n—a"--1—ainn—A—m—.:1—.11—al—.21—.H—.11 1•=1.11:13TAInall:1 T■ I I —.:1—.11—ann—A.

_ _ -.z . at end of each tier of concrete blocks to stop movement

It r---

Top 16mm Dia. continuous wire rope

Short 16mm Dia. wire rope looped around main cables

Short 16mm Dia. wire rope looped around main cables

ELEVATION Scale 1 : 50

a


STANDARD DETAIL TYPICAL CONCRETE BLOCK CABLING DETAIL


Te Pane IVIatua Taiao

VERSION # 1

DESIGN DRAWN

COMPILED P.COOK

CHECKED eCevt.w-Alei APPROVED Drawing No. RL-5317 / FILE N/50/2/6 Cad: RL-5317_C.dwg

April 2013 April 2013 -5/511' 6Iqi 3

Documents

RIVER EROSION REPAIR - GW · RIVER EROSION REPAIR Details contained in this document have been prepared to offer assistance to GWRC staff and Contractors. The techniques and plans