SanitContam July 12 2011
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ABCDEF
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Simulating the Risk of Sanitation to Drinking Water from Groundwater
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Introduction:
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This simple model allows for looking at inter-relationship between various risk factors that contribute to
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contamination from on-site sanitation.
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The user can provide estimated values of controlling parameters such as depth to water table, depth of pit, distance to well
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The output is in the form of the time taken to travel from sanitation to well. Interpretation of this time as risk is provided.
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In this example, parameters have been set to look at a 12 month cycle in which the depth to water table and groundwater gradient are varied.
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The situation is typical to a monsoonal type rainfall and a hard rock aquifer with very short distance to drinking water well.
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One can view the individual time taken to reach the water table, to reach the well and the total time taken.
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The user has options of 3 interventions 1. Using drier latrines, 2. Raising the latrine pit and 3. Having the drinking water well farther.
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The travel time to the well can be seen by making variations on these interventions and see which of them has greater impact.
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Assumptions:
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The model is a simple one in which homogenous aquifer conditions are taken. Also, the unsaturated hydraulic conductivity is estimated
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by assuming it as a function of hydraulic loading from the sanitation structure. A 100mm/d loading is considered to lead to saturated conditions.
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From 500 mm/d to 100 mm/d the hysteresis factors is varied from 0.1 to 1 linearly. It is varied from 0 to 0.1 linearly with loading of 0 to 50 mm/d
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Credit:
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The first version has been prepared on June 8, 2011 by Sunderrajan Krishnan from INREM Foundation as inputs into a study support by the
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Bill and Melinda Gates Foundation look at sanitation-groundwater contamination linkages.
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Description
Analysis
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