B-5-4
TABLE B.5-1. QUAL2E INPUT PARAMETERS FOR LOW FLOW SIMULATION
Parameter Value Percent Variationa Data Source
Hydraulic Data
Roughness (Manning’s
coefficient)
0.05 10 BASINS data (EPA 1998)
Side Slopes (ft/ft) 0.15 5 Estimated during site visit
Width (feet) 3 5 Estimated during site visit
Slope (ft/ft) 0.0007 5 BASINS data (EPA 1998)
Reaction Rates and Coefficients
BOD decay rate (/day) 3 50 Assumed from literature review (EPA
1985)
SOD rate (g/ft2-day) 0.4 20 Assumed from literature review (EPA
1985)
Reaeration Rate (per
day)
8 to 12b 15 Assumed from literature review (EPA
1985)
Inflow Conditions (Olney STP Effluent)
Flow (ft3/s) 2.78 NA Average effluent flow from Olney
STP discharge monitoring reports for
1999 through 2001 (Olney STP 2001)
Temperature (°F) 60 NA Average in-stream temperature
measured by IEPA in 1999 and 2000
(IEPA 2001)
DO concentration
(mg/L)
Average 7.1
Minimum 6.0
Maximum 9.5
NA Value from monthly discharge
monitoring reports from 1999 through
2001 (Olney STP 2001)
BOD concentration
(mg/L)
Average 1.04
Minimum 1.0
Maximum 2.0
NA Value from monthly discharge
monitoring reports from 1999 through
2001 (Olney STP 2001)
NH3-N concentration
(mg/L)
Average 0.08
Minimum 0.02
Maximum 0.78
NA Value from monthly discharge
monitoring reports from 1999 through
2001 (Olney STP 2001)
Notes:
BOD Biological oxygen demand
DO Dissolved oxygen
ft/ft Foot per feet
ft3/s Cubic foot per second
g/ft2-day Gram per foot squared-day
mg/L Milligram per liter
NA Not applicable
NH3-N Ammonia nitrate
SOD Sediment oxygen demand
STP Sewage treatment plant
a Inflow condition variations were not considered in the Monte Carlo simulation because separate
simulations where run for the average, maximum, and minimum inflow conditions.
b Reaeration rate is based on the Owens, Edwards, Gibbs, and the Foree equations (EPA 1985). The range
reflects the variation in reaeration rates along different portions of the segment.
