The City of Joliet regulates stormwater management through its Consolidated Stormwater Management Regulations (Chapter 8, Article X). The ordinance controls peak discharge rates, requires detention for new development and redevelopment, and mandates best management practices. Peak 2-year discharge cannot exceed 0.04 cfs per acre and peak 100-year discharge cannot exceed 0.15 cfs per acre.
Joliet's Stormwater Management Ordinance is part of the Consolidated Stormwater Management, Soil Erosion, Sediment Control, and Floodplain Management Regulations under Chapter 8, Article X. The ordinance requires that new development and redevelopment control stormwater runoff to predevelopment levels. Peak discharge from events up to the 2-year storm cannot exceed 0.04 cfs per acre, and peak 100-year discharge cannot exceed 0.15 cfs per acre. Detention basins must be designed with clearly distinguished wet and dry portions. Standing water in dry basins must drain within 72 hours for events below the 100-year event. Velocity dissipation measures are required at all inlets and outlets. The city is the permitting authority for all land-disturbing activities and requires approved stormwater control plans. Property owners are responsible for maintaining all on-site stormwater facilities. The city participates in the NPDES MS4 stormwater permit program under the Illinois EPA.
Non-compliance with stormwater requirements may result in stop-work orders, permit revocation, fines, and required remediation. The city may perform corrective work at the owner's expense.
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