Attachment C - Geotechnical investigation

PRACTICE NOTE GUIDELINES FOR LANDSLIDE RISK MANAGEMENT 2007

EXAMPLES OF GOOD HILLSIDE pele

 
 
 
 
  
  
  
 
 
  
  
  
    
 
 

Surface wate: interception drainage

Watertight, adequately sited and founded
rool water storage larvke (with due regard for
Impact ef potertia) waabage)

Plesible sructure

Roof water piped aff ste cr aicred

Grssite creention tanks, walernght at
edequately founded. Poteriii! leakage
managed by sub-sol drains

— MANTLE OF SOM AND ROTH
FRAGMENTS (COLLUVILW)

SS Pier footings tena rock
~~ Sunsail drainage may be
required in slope
‘“— Cutting and filtng minimised in davelapment

*—_ Sewage efftuent pumped cut 61 connected to sower.
Tanke adequately founded and waterignt. Potential
lecieage managed bry suh-scoll drains

\

“> Engingered retaining walls with both surface and

subsurface drainage (constructed before dialing) ahiiac bishag

EXAMPLES OF POOR HILLSIDE PRACTICE

Unetebtised rock toppies
ond tirwals doensiage

Vegetnten removed ——

Diteherges. ot motwater soak Biosp unsupported \ 4
, !

   
  
 
  
    
 
  
 
  
 
 
 

 

eay rather than coducted off Dut fates
tile or to necore storage for reise

‘Sructure unatte tc tolerate an
eattherrent and cracks it ee

Poort) compacted fil entices 4
Uneverly and cracks pool 8,

jnadequate walling unatle
fo support Mi a
i

Loose. saturated 4 cites
and possibly Nowe dowemtope i

|
i

Inacoquetely supportad cut tlle
4

Sea rabed
slope hi —

Vegetation
rermcvett

Med fow |
ors

 
 
  

. |_—Antenos of scbeot drarage mthin sv
—— Pordect water enters shine and actiates landstde ret abe ied
* Rossitte waved GONRICOS whch loacts olvar develagmint downtt Srey alien ALCS (20500) Appgaewnctix

114 Australian Geomechanics Vol 42 No 1 March 2007