Meyer Judgment Sealed

PRACTICE NOTE GUIDELINES FOR LANDSLIDE RISK MANAGEMENT 2007

EXAMPLES OF GOOD HILLSIDE PRACTICE

Vegetation retained

 
 
 
 
  
  
 
 
 
  
 
  
   

Surface water interception drainage ~

ae

Watertight, adequately sited and founded ms

roof water storage lanks (with due regard for
impact of potential leakage)

Flexible structure

Roof water piped off site or stored a

On-site detention tanks, watertight and
adequately founded. Potential leakage
managed by sub-soil drains

      
  

i \. MANTLE OF SOM. AND ROCK
Vegetation retained FRAGMENTS (COLLUVIUM)
OFF STREET °~Pier footings into rock
res \~ Subsoil drainage may be
required in slope

.
‘\— Cutting and filling minimised in development

\ YS Sewage effiuent pumped out or connected to sewer.
\ Tanks adequately founded and watertight. Potential
\ leakage managed by sub-soil drains

|
“\— Engineered retaining walls with both surface and

subsurface drainage (constructed before dwelling) © acs (2006)

EXAMPLES OF POOR HILLSIDE PRACTICE

Unstabilised rock topples
and travels downslope —
Vegetation removed ——,

Discharges of roofwater soak Steep unsupported
away rather than conducted off cut fails
site or to secure storage for re-use ——

 
  
   
 
 
  
 
  
 
 
 
 
  
 
 
  
 
 
 
  
  

 

Structure unable to tolerate 7
settlement and cracks we

 

Poorly compacted fill settles . \
unevenly and cracks pool ———— \

Inadequate walling unable y
to support fill fon?

Loose, saturated fil slides i)
and possibly flows downslope s |

inadequately supported cut fails ‘|

Saturated
slope faits —

Vegetation \ Si \ : Dwelling not founded in bedrock
removed — \ "

Mud flow | a
occurs: Z

  
  
 

\ ‘Absence of subsoil disinage within ft
Ponded water enters slope and activates landslide © AGS (2006)

*~Possible travel downslope which impacts other development downhill ‘See also AGS (2000) Appendix J

 

 

Se

Australian Geomechanics Vol 42 No 1 March 2007

Form No. 68029 RL2 August 2010

80