Texas A & M University and U.S. Bureau of Reclamation
Hydrologic Modeling Inventory
Model Description Form
JUNE 18, 1999
Name of Model:
Illinois Urban Storm Runoff Model (IUSR)
Model Type:
IUSR is an event-based model using hydrodynamic equations to simulate Urban
Watershed Runoff
Model Objective(s):
To provide runoff hydrographs for urban stormwater management
Agency and Office:
V.T. Chow Hydrosystems Lab, University of Illinois at Urbana-Champaign
Technical Contact and Address:
Dr. Ben C. Yen, Dept. of Civil and Environmental Engineering, University of
Illinois, 205 N. Mathews Ave. Urbana, IL 61801, Fax: (217) 333-0687
Model Structure or Mathematical Basis:
The IUSR model is a package consisting of three submodels and other
components: The Illinois Surface Runoff Model, the Illinois Storm Sewer Model
Simulation (ISS) Model, and the Illinois Sewer System Water Quality Model. In surface
runoff model infiltration calculated with Horton’s formula and overland flow by
kinematic wave routing. In the ISS model the Saint-Venant equations are solved with a
second-order characteristic method. In the water quality model mass-balance
concentration equations are used.
Model Parameters:
Input: rainfall, watershed properties, sewer network and pollutant in flow. Output:
discharge and depth hydrographs and pollutographs
Spatial Scale Employed in the Model:
Urban watersheds decomposed into contributing catchments and sewers
Temporal Scale Employed in the Model:
Event based, discretized as specified by user
Input Data Requirements:
See model parameters
Computer Requirements:
Model Output:
See model parameters
Please see the HMI web page: http://www.usbr.gov/hmi
Forms are available in Text file, HTML, MS Word and WordPerfect formats
This effort is being conducted by River Systems & Meteorology Group: http://www.usbr.gov/rsmg
Parameter Estimation / Model Calibration:
Model Testing and Verification:
Model Sensitivity:
Model Reliability:
Model Application / Case Studies:
Documentation:
Chow, V.T. and Yen, B.C. (1976). “Urban Stormwater Runoff: Determination of
Volumes and Flow Rates,” Environ. Protection Tech. Series EPA-60/2-76-116, USEPA,
Cicinnati, OH
Other Comments:
Please see the HMI web page: http://www.usbr.gov/hmi
Forms are available in Text file, HTML, MS Word and WordPerfect formats
This effort is being conducted by River Systems & Meteorology Group: http://www.usbr.gov/rsmg