Drought Vulnerability of Illinois' Community Surface Water Systems - Vulnerability, Illinois State Water Survey

Illinois Drought


Drought Vulnerability Classification

At-Risk System – There is greater than a 10% probability that the current system would not be able to provide the community’s current rate of water demand through a severe drought similar to the drought of record.

Drought Adequacy Description

If a drought similar to the 1962-1964 drought of record were to recur today, it is estimated with 50% confidence that the current system would be able to support a demand of 0.29 mgd (the mid- or best yield estimate). It is estimated with 90% confidence that the current system would be able to support a demand of 0.14 mgd. Because the system would not be able to fulfill the community’s current demand of 0.24 mgd with 90% confidence, the drought vulnerability of the system is classified as AT-RISK.

Additional Notes

Note that Carthage purchases between 0.02 and 0.07 mgd per year from Hamilton to supplement its own water supply based on water use reported between 2005 and 2008.

Population Served:





Mississippi No. Central

System Information

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Illinois State Water Survey

2204 Griffith Dr., MC-674
Champaign, IL 61820-7463
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