Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 378 - EFFLUENT DISINFECTION EXEMPTIONS › Subpart C - FECAL COLIFORM DIE-OFF MODEL › Appendix C - Discharge and Travel Time Estimation

Current through Register Vol. 48, No. 28, July 12, 2024
The Illinois State Water Survey, in a publication entitled,
				  "Hydraulic Geometry of Illinois Streams," (by J.B. Stall and Y.S. Fok, WRC
				  Research Report 15, 1968) provides a method of predicting discharge and average
				  stream velocity in stream basins as a function of drainage area. The equations
				  are listed below. Where an equation is not listed for the basin of interest,
				  the statewide composite equations may be used. Drainage areas can be obtained
				  from the U.S. Geological Survey report entitled "River Mileages and Drainage
				  Areas for Illinois Streams - Volumes 1 and 2," (by R. W. Healy, Water Resources
				  Investigation 79-110 and 79-111, 1979).
Hydraulic Geometry Equations for Illinois
				  River Basins
Description of Units
Q = discharge in cubic feet per second
				  (cfs)
V = average velocity in feet per second
				  (fps)
Ad = drainage area in
				  square miles
F = frequency in percent of days, as a
				  decimal
1n denotes that all logarithms are natural
				  logarithms to the base
e = 2.718
Statewide Composite Equations
1n Q = 1.176 - 5.22 F + 0.984 1n
							 Ad (cfs)
1n V = 0.103 - 1.81 F + 0.158 1n
							 Ad (fps)
Rock River
Des Plaines River
1n Q = 0.24 - 3.50 F + 1.03 1n
							 Ad
1n V = 0.20 - 1.50 F + 0.13 1n
							 Ad
1n Q = 1.78 - 4.98 F + 0.90 1n
							 Ad
1n V = 0.26 - 1.31 F + 0.08 1n
							 Ad
Galena River
Kankakee River
1n Q = 0.13 - 2.27 F + 0.96 1n
							 Ad
1n V =-0.06 - 0.81 F + 0.06 1n
							 Ad
1n Q = 1.41 - 5.12 F + 0.96 1n
							 Ad
1n V =-0.38 - 1.19 F + 0.17 1n
							 Ad
Fox River
Vermilion River (Illinois River Basin)
1n Q =-0.24 - 3.33 F + 1.13 1n
							 Ad
1n V = 0.11 - 1.39 F + 0.16 1n
							 Ad
1n Q = 0.97 - 6.28 F + 1.01 1n
							 Ad
1n V =-0.20 - 2.19 F + 0.17 1n
							 Ad
Mackinaw River
Kaskaskia River
1n Q = 1.39 - 7.52 F + 1.00 1n
							 Ad
1n V = 0.38 - 2.26 F + 0.09 1n
							 Ad
Henderson Creek
1n Q = 0.95 - 5.88 F + 1.02 1n
							 Ad
1n V =-0.26 - 1.28 F + 0.14 1n
							 Ad
Vermilion River (Wabash River Basin)
1n Q = 1.44 - 5.00 F + 0.89 1n
							 Ad
1n V = 0.58 - 1.76 F + 0.01 1n
							 Ad
1n Q = 1.11 - 4.96 F + 0.98 1n
							 Ad
1n V =-0.81 - 2.20 F + 0.29 1n
							 Ad
Spoon River
Embarras River
1n Q = 0.86 - 4.82 F + 1.00 1n
							 Ad
1n V = 0.52 - 1.63 F + 0.08 1n
							 Ad
1n Q = 0.04 - 5.61 F + 1.17 1n
							 Ad
1n V =-0.92 - 1.62 F + 0.26 1n
							 Ad
LaMoine River
Little Wabash River
1n Q = 1.03 - 5.60 F + 0.92 1n
							 Ad
1n V =-0.13 - 1.16 F + 0.11 1n
							 Ad
1n Q = 1.91 - 7.90 F + 0.96 1n
							 Ad
1n V =-1.38 - 1.18 F + 0.30 1n
							 Ad
Sny River
Big Muddy River
1n Q =-2.27 - 5.87 F + 1.63 1n
							 Ad
1n V =-1.29 - 1.06 F + 0.39 1n
							 Ad
1n Q = 1.26 - 8.50 F + 1.09 1n
							 Ad
1n V =-0.75 - 1.47 F + 0.18 1n
							 Ad
Sangamon River
Big Bay Creek
1n Q = 0.65 - 4.93 F + 1.03 1n
							 Ad
1n V =-1.01 - 0.95 F + 0.26 1n
							 Ad
1n Q = 1.48 - 7.90 F + 1.05 1n
							 Ad
1n V =-0.53 - 0.41 F + 0.14 1n
							 Ad