Illinois Environmental Protection Agency Charleston Side Channel Reservoir TMDL
Table 6. Upper Embarras River Watershed Calibration Results for the 1974 Water Year.
Simulation Name:
USGS Gage
03344000 Simulation Period:
Watershed Area (ac): 599,188
Selected a Year for Flow Analysis: 1974
Type of Year (1=Calendar, 2=Water Year) 2 Baseflow PERCENTILE: 2.5
Water Year 1974: Usually 1%-5%
10/1/1973 to 9/30/1974
Total Simulated In-stream Flow: 22.09 Total Observed In-stream Flow: 23.19
Total of highest 10% flows: 10.54 Total of Observed highest 10% flows: 10.59
Total of lowest 50% flows: 2.10 Total of Observed Lowest 50% flows: 2.19
Simulated Summer Flow Volume (Months 7-9): 1.78 Observed Summer Flow Volume (Months 7-9): 1.33
Simulated Fall Flow Volume (Months 10-12): 3.81 Observed Fall Flow Volume (Months 10-12): 2.92
Simulated Winter Flow Volume (Months 1-3): 7.61 Observed Winter Flow Volume (Months 1-3): 9.45
Simulated Spring Flow Volume (Months 4-6): 8.90 Observed Spring Flow Volume (Months 4-6): 9.50
Total Simulated Storm Volume: 21.73 Total Observed Storm Volume: 21.97
Simulated Summer Storm Volume (Months 7-9): 1.69 Observed Summer Storm Volume (Months 7-9): 1.02
Errors (Simulated-Observed) Recommended Criteria** Last run
Error in total volume: -4.96 10
Error in 50% lowest flows: -4.62 10
Error in 10% highest flows: -0.44 15
Seasonal volume error - Summer: 25.31 30
Seasonal volume error - Fall: 23.41 30
Seasonal volume error - Winter: -24.16 30
Seasonal volume error - Spring: -6.74 30
Error in storm volumes: -1.14 20
Error in summer storm volumes: 39.37 50
* Months 1–3 = January, February, March
Months 4–6 = April, May, June
Months 7–9 = July, August, September
Months 10–12 = October, November, December
** Source: Lumb, et al., 1994.
Appendix B-14 SWAT2000 Modeling
