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 3.01 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 2.01 mgd. Because the system would not be able to fulfill the community’s current demand of 2.30 mgd with 90% confidence, the drought vulnerability of the system is classified as AT-RISK.

Additional Notes

Note that Macomb’s yield includes 0.84 mgd it can obtain from groundwater sources.

Population Served:





La Moine

System Information

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Illinois State Water Survey

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