Transcript Watershed Modeling using HEC-HMS and EPA-SWMM

Watershed Modeling using
HEC-HMS and EPA-SWMM
©T. G. Cleveland, Ph.D., P.E.
10 July 2012
Lesson 1
Introduction
• Purpose
• Organization
• Resources
– Lesson 1; Getting Started
Purpose
• Train engineers and scientists in the use of
two professional tools (HEC-HMS and EPASWMM) for integrated hydrology and
hydraulic modeling.
• Integrated the two tools can substantially
simulate watershed behavior without resort to
higher dimensional models, and that
integration is focus of the course.
Purpose
• Course is a software-centric training course
and assumes the participants have prior
experience in hydrology and hydraulics
• Course further assumes that participants are
computer literate and can comfortably
function with concepts of files, paths, etc.
• “By-hand” computations in this course means
using a spreadsheet.
Organization
• The course is organized into “lessons”
• Each lesson typically contains:
– Narrative (in the notebook)
– Presentation (a powerpoint)
– Exercise (“Hands-On” or follow example)
– Video (some lesson components have movies)
– Readings (I will try to keep readings grouped with
lessons, however many will apply across lessons)
Organization
• The course is organized into “lessons”
• Each lesson typically contains:
– Narrative (in the notebook)
– Presentation (a powerpoint)
– Exercise (“Hands-On” or follow example)
– Video (some lesson components have movies)
Resources
• The course will require you to have a laptop
computer running the Windows operating
system.
• You will need to download and install:
– HEC-HMS
– EPA-SWMM
– Apple QuickTime viewer
– ENGAUGE (optional, but really useful)
Resources
• Course materials are located in a server, the
URL is presented in-class
• A subset will be distributed on a flash drive
(you keep the drive)
Topics
• HEC-HMS and SWMM runoff models – the
similarities and the big differences.
• Preparing geographic, hydraulic, and
hydrologic data
– the dirty work before modeling.
– Use of Acrobat, Excel, and other common tools to
prepare the time series for straightforward import
into the programs.
Topics
• HEC-HMS models
– Runoff, storage, unit hydrographs
– Routing, design storms, complex catchment
• Troubleshooting HEC-HMS
– DSSVue for irregular time data entry
Topics
• SWMM models of surface runoff and storage.
– Relationship of hydraulic response and parametric
unit hydrographs.
• Troubleshooting SWMM. Complex catchment
hydraulic modeling.
• Integrating the two models for cases where
SWMM hydrology is inadequate and/or HECHMS hydraulics are inadequate.
Philosophy
• The course is built on a training-type model
rather than a knowledge-type model
• Learn by doing
– Learning how to drive computer programs
– Suggest which vehicle to choose for which terrain,
but emphasis will be on how to move from
conceptualization to simulation
• Won’t get much “formal” theory – acquire as
necessary
Getting Started
• HEC-HMS is a hydrology program
– Has some simplified hydraulics.
– Flow is uni-directional.
– Model is “link-node” relationship.
• EPA-SWMM is a hydraulics program
– Has simplified hydrology.
– Flow can be bi-directional.
– Model is “link-node” relationship.
HEC-HMS
• Framework that integrates various hydrologic
process models to produce estimates of
discharge time series at locations of interest in
a watershed.
– Comprised of many sub-process models, some are
always present, even if they are “null”, some may
be absent.
EPA-SWMM
• Framework that links hydraulic component
(pipes, reservoirs, pumps, etc.) models. These
components are generally well documented
physics models.
– Simplified hydrology process sub-model as part of the
system.
– SWMM has a constituent fate and transport model.
• The hydrologic process sub-models are quite
limited as compared to HEC-HMS.
Which to use?
• Using the driving analogy, depends on the
terrain (and the driver).
• HEC has some nice built-in precipitation
models. SWMM is crude in this respect, so
might use HEC as a rainfall generator for
SWMM (Crossover SUV?)
Installing Software
• The remainder of this lesson is a workshop to
accomplish the following tasks:
– Verify HEC-HMS install
– Verify DSSVue Install
– Verify SWMM Install
– Verify ENGAUGE Install
– Verify AppleQuickTime install
Documenting Your Work
• The exercises are “homework” in the sense that I
would like you to document success/failure on
each.
• For Verify-Type exercises, produce a letter report
with screen captures.
• Print the letter report and hand-in, I will simply
keep it in a file as record of completion.
• Later exercises will be more extensive, but short
reports will be the sufficient documentation.