Susceptibility Analysis

WHAT IS A POTENTIAL SUSCEPTIBILITY ANALYSIS?

A Potential Susceptibility Analysis is a determination of the susceptibility of the public water supply to contamination by significant potential sources identified within the source water protection area. The potential susceptibility analysis consists of a sensitivity analysis, which includes factors inherent to the system and source water, and a vulnerability analysis, which is the number and types of significant potential sources of contamination identified. Therefore, the potential susceptibility analysis combines a hydrogeologic or hydrologic sensitivity analysis with a vulnerability analysis within the delineated areas. The results of the analysis can be used as a basis for determining appropriate new protection measures or reevaluating current protection efforts.

Potential Susceptibility Analysis for Ground Water Systems

Factors considered in determining sensitivity for ground water systems include:

  • Depth of the well (the shallower, the more sensitive)
  • Age of the well (the older, the more sensitive)
  • Average ground water velocity in the aquifer in which the well is screened (the higher, the more sensitive)
  • Soil recharge potential (the higher, the more sensitive)

The types and quantity of significant potential sources of contamination found and their distance from the well(s) will influence the degree of vulnerability for the water system.

Potential Susceptibility Analysis for Surface Water Systems

Factors considered in determining sensitivity for surface water systems include:

  • Age of the intake (the older, the more sensitive)
  • Length of streams in the source water protection area (the longer, the more sensitive)
  • Runoff (the higher, the more sensitive) factors - high precipitation, steep slope, low vegetative cover, and low soil permeability contribute to high runoff

The types and quantity of significant potential sources of contamination found and their distance from the surface water source (stream, river, reservoir or lake) will influence the degree of vulnerability for the water system.

 

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