Slope Stability Report - Site 1

APPENDIX G - SOME GUIDELINES FOR HILLSIDE CONSTRUCTION

 

 

 

 

 

 

 

 

 

 

Fas

vide dramage measures and erosion contol.

oe

Strip vegetation and topscdl and key into aamral slopes price to filling
‘Use clean 40] matecials and compact to engimecring standards.
Batter to appropriate slope or support with engineered retaining wall.

GOOD ENGINEERING PRACTICE POOR ENGINEERING PRACTICE
ADVICE
GEOTECHNICAL Obnim advice Som a expensnced geotechnical practioner at early | Prepare detailed plan and stact site works before
ASSESSMENT sage of plannms and before site works geotechnical advice.
PLANNING
SITE PLANNING Having obtained geotechnical advice, plan the development with the mek | Plan development without regard for the Risk.
from the identified hazard: and consequences in mind
DESIGN AND CONSTRUCTION
Use flexible structures which incorporate properly designed brickwork, timber | Floor plans which require extensive cutting and
HOUSE DESIGN or steel Tames. imber or panel cladding i :
Consider use of split level: Movement intolerant structures.
Use docks for recreational areas whers appropriate.
SITE CLEARING Retain natural vegetation wherever practicable. Indjscriminately clear the site.
ACCESS & Satisfy requirements below for cats, fills, retaining walls and dramage. Excavate and fill for site access before
DRIVEWAYS Council specifications for grades may need to be modified geotechnical advice.
Driveways and parking areas may need to be fully supported on piers.
EARTHWORKS Retain natural contours wherever possible. Indtscximinatory bulk oarthworks.
Manzzise dopa. Large scale cuts and benching
Curs Pr we ened eens we ee eee they Unsupported cuts

| Imors Gramazerequements
Loose or poorly compacted S10, which if it fails,

may flow a considerable distance including

omto propecty below.

Block natural drainage lines.

Fill over existing vegetation and topsoil.

Inchnde stumps, tress, vegetation, topsoil
i rubble stc in £0.

 

Rack OUTCROPS

Remove or stabilise boulders which may have unacceptable nak.

Disturb or undercut detached blocks or

 

 

 

 

 

 

 

 

& BOULDERS Support rock faces where necessary. boulders
Engineer design to resist applied soil and water forces. Construct a stractazally inadequate wall such 2:
RETAINING Found on rock where practicable. sandstons flagging, brick or umreinforced
WALLS Provide subsurface drainage within wall backiill and surface drainage on slope | blockwork.
above. Lack of sabsurface drains and weephoks.
Construct wall as scon a5 possible after cat/fill operation.
Found within rock where practicable. Found om topsoil, loose SI detached boulders
FOOTINGS ‘Use rows of piers or strip footings oriented up and down slope. or undercut clift.
Desise for lateral cosep pressures if necessary.
BackSll footing excavations to axchads imaress of surdace water.
Engineer desimed.
Support on piers to rock where practicable.
SWIMMING POOLS | Provide with under-~drainage and sravity drain outlet where practicable.
Desise for high soil pressures which may develop on uphill side whilst there
zazy be Little or no Lateral sapport on downhill sids.
DRAINAGE
Provide at tops of cat and fill slopes. Discharge at top of fills and cats.
Discharge to street drainage or natural water courses. Allow water to pond on beach areas.
SURFACE Provide gemeral falls to prevent blockage by siltation and imcorporate silt traps.
Lime to minimise infiltration and make flexible where possible.
tal stractures to dissipate emergy at changes of slope and/or direction.
Provide Slter around subvarface drain. Discharges rood ranoff into absorpticn trenches
omens Provide drain behind retains walls.
- ‘Use flexible pipelines with access for maintenance
Prevent inflow of surface water.
Soar & Uvaally requizes Or mains sewer systems; absorption teaches may | Discharge sullage directly onto and imto slopes.
SULLAGE be possible in some areas if rick is acceptable. Use absorption tenchss without consideration
— Storage tanks should be water-tight and adequately founded. of landslide misk.
EROSION Control erosion as this may lead to instability. Failure to observe carthworks and dramago
CONTROL & Revegetate cleared area recommendations when landscaping.
LANDSCAPING

DRAWINGS AND SITE VISITS DURING CONSTRUCTION

 

 

 

 

 

 

 

DRAWINGS Building Application drawings should be viewed by geotechnical consukant
SITE VISITS Site Visits by consultant be iate darms comstruction’
INSPECTION AND MAINTENANCE BY OWNER
OWNER'S Clean dramage systems; repair broken joints in drm: and leaks m supply
RESPONSIBLITY i

Pupes.
Where structural distress is evident see advice
Tf seepage observed, determines causes or sesk advice om consequences.