Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS
Subpart B - ENGINEERING REPORTS, PLANS AND SPECIFICATIONS
Section 370.211 - Design Flows
Current through Register Vol. 48, No. 38, September 20, 2024
The following flows shall be identified in the basis of design for sewers, lift stations, sewage treatment plants, treatment units and other wastewater handling facilities.
a) Design Average Flow
The design average flow is the average of the daily volumes to be received for a continuous 12-month period of the design year, expressed as a volume per unit of time.
b) Design Maximum Flow
The design maximum flow is the largest volume of flow to be received during a continuous 24-hour period, expressed as a volume per unit of time.
c) Design Peak Hourly Flow
The design peak hourly flow is the largest volume of flow to be received during a one hour period, expressed as a volume per unit of time.
d) Design Peak Flow
The design peak flow is the instantaneous maximum flowrate to be received.
