McHenry County panel debates raising impervious-area exemption, advances plan for a ‘simplified method’ tool
County staff presented analyses showing why keeping a half-acre trigger may be safer than a blanket 1-acre exemption and proposed a GIS-based "simplified method" to let landowners estimate runoff without routine engineering. The committee asked staff to refine curve-number tables and bring a draft tool back for review.
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Staff member (S1) presented a draft approach to McHenry County’s stormwater ordinance on March 5, proposing a county "simplified method" and asking whether the current half-acre exemption for impervious-area review should be raised to 1 acre for large agricultural parcels.
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