1. Applied Hydrology Hydrological Analysis and Simulation Model HEC-HMS
Prof. Ke-Sheng Cheng
Department of Bioenvironmental Systems Engineering
National Taiwan University

2. Introduction
Hydrological analysis and simulation generally involve many components including precipitation, infiltration, rainfall-runoff transformation, reservoir routing, channel routing, design of water conveyance or detention structures, etc.
Hydrological and hydraulic analyses (H&H analyses)
Computer models capable of handling all these tasks in one run are very helpful in engineering design and assessment of possible alternatives.
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

3. Many hydrological models have been developed.
HEC-HMS, HEC-RAS
SWMM
HSPF
SOBEK
MIKE
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

4. HEC-HMS Developed and distributed by the US Army Corps of Engineering.
Free download is available.
HMS is a project-based hydrologic modeling system. A project is composed of several components
Basin model component
Meteorological model component
Control specifications component
Input data component
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

5. User Interface Watershed Explorer Desktop Component Editor Message Log
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

6. HMS model components
A simulation run calculates the rainfall-runoff response in the basin model given rainfall input from the meteorological model.
The control specifications component define the time period and time step of the simulation run.
The input data component provides auxiliary data that are required for the simulation run including
Time series of hyetograph
Stage-storage-discharge relationship
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

7. Basin model component
Basin model component defines hydrological elements that form the watershed drainage network and types of hydrological analysis that need to be conducted in a simulation run.
Hydrological elements
Subbasin
Reach
Junction
Reservoir
Diversion
Sink
Source
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

8. Starting HEC-HMS
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

9. Create a new project or open an existing project
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

10. The same watershed can be modeled by different Basin models to assess the effect of different hydrological modeling approaches.
Create a Basin Model
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

11. Adding hydrological elements to Basin 1.
A subbasin cannot be connected to downstream point without a downstream element (junction or reach).
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

12. Create a meteorological model
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

13. Create Control Specifications
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

14. Create and compute a simulation run
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

15. Check simulation results
Culverts diameter=1m
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

16. Culverts diameter=3m 12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

17. 12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

18. Whippany Landfill Closure Plan Drainage design
Pre-development
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

19. Pre-development
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

20. Post-development
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

21. Post-development
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU

22. Practical drainage design necessitates detailed hydrological modeling and simulation.
Sizing the drop flume
Designing the peripheral ditch
Grading and storage routing in front of the entrance to drop flumes
Hydraulic jump calculation at the D/S end of drop flumes (side protection for the peripheral ditch)
12/9/2018
Lab for Remote Sensing Hydrology and Spatial Modeling, Dept. of Bioenvironmental Systems Eng., NTU