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6.3.1 Physical Conditions Assessment
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6.3.1 Physical Conditions Assessment

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Key aspects to be assessed include:

 

  • Socioeconomic conditions. This will provide perspective on the types of technologies that are likely to be acceptable and affordable for the village.
  • Population distribution. For example, if the houses are closely spaced with small lots, the use of decentralized on-site sanitation systems may not be viable.
  • Water supply conditions. Access to municipal water supply results in high volume of wastewater generated. This will impact the facilities’ design capacity and selection of applicable technologies.
  • Topography. In the coastal plains the villages are on relatively flat land so that the layout of sewers may not be complicated; however, in mountainous regions lot elevations vary significantly resulting in complex and costly sewers.
  • Geology, soil and groundwater conditions. What is the permeability of soils? What is the nature and depth of bedrock? How deep is groundwater? All these will have a significant influence on the sanitary solution found to be appropriate for the village.
  • Climate. Temperature will affect the viability of bacteria, and therefore impact the treatment efficiency of biological treatment technologies. Local temperature will be carefully considered during project design.
  • Electrical supply conditions. If the villages or potential sites have limited access to electricity, wastewater treatment technologies requiring continuous electrical supply are not a suitable choice.
  • Identifying any potential geologic hazards, primarily landslides, at an early stage of project planning can hopefully avoid serious problems that could occur if wastewater is directed into a potentially unstable area.
  • Identifying flood zones is also important to avoid constructing any facilities in areas that are prone to flooding.

 

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