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Introduction to USEPA SWMM

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Introduction to USEPA SWMM CE 572 - Analysis of Urban Water Systems Fall 2008 Topics to Be Covered SWMM s Capabilities Old SWMM v. New SWMM SWMM s Data Objects ... – PowerPoint PPT presentation

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Title: Introduction to USEPA SWMM


1
Introduction to USEPA SWMM
  • CE 572 - Analysis of Urban Water Systems
  • Fall 2008

2
Topics to Be Covered
  • SWMMs Capabilities
  • Old SWMM v. New SWMM
  • SWMMs Data Objects
  • SWMMs Process Models
  • Additional Resources

3
What Is SWMM?
SWMM is a distributed, dynamic rainfall-runoff
simulation model used for single event or
long-term (continuous) simulation of runoff
quantity and quality from primarily urban areas.
4
SWMMs Process Models
5
Hydrologic Modeling Features
  • Spatially and time varying rainfall
  • Evaporation of standing surface water
  • Snow accumulation and melting
  • Interception from depression storage
  • Infiltration into soil layers
  • Percolation into shallow groundwater
  • Interflow between groundwater channels
  • Nonlinear routing of overland flow

6
Hydraulic Modeling Features
  • Handles drainage networks of any size
  • Accommodates various conduit shapes as well as
    irregular natural channels
  • Models pumps, regulators, storage units
  • Allows external inflows from runoff, groundwater,
    RDII, sanitary, DWF, and user-supplied time
    series
  • Uses flexible rule-based controls for pumps and
    regulators
  • Models various flow regimes, such as backwater,
    surcharging, reverse flow, and surface ponding

7
Water Quality Modeling Features
  • Pollutant buildup over different land uses
  • Pollutant washoff during runoff events
  • Reduction in buildup from street cleaning
  • Reduction in washoff from BMPs
  • Inflows from user-defined sources and sanitary
    DWF
  • WQ routing through the drainage network
  • User-defined treatment functions

8
Typical Applications of SWMM
  • Design and sizing of drainage system components
    including detention facilities
  • Flood plain mapping of natural channel systems
  • Control of combined and sanitary sewer overflows
  • Generating non-point source pollutant loadings
    for wasteload allocation studies
  • Evaluating BMPs and LIDs for sustainability goals

9
Limitations of SWMM
  • Not applicable to large-scale, non-urban
    watersheds
  • Not applicable to forested areas or irrigated
    cropland
  • Cannot be used with highly aggregated (e.g.,
    daily) rainfall data
  • Its an analysis tool, not an automated design tool

10
SWMM Chronology
  • 1971 - SWMM I (ME, UF, WRE)
  • 1975 - SWMM II (UF)
  • 1981 - SWMM 3 (UF CDM)
  • 1983 - SWMM 3.3 (PC Version)
  • 1988 - SWMM 4 (UF CDM)
  • 2005 SWMM 5 (EPA CDM)

11
Old SWMM Structure
12
Structure of SWMM 5
13
SWMM 5s Visual Objects
14
Flow Routing Algorithms in SWMM5
  • Steady Flow
  • simple hydrograph translation
  • applicable only to branched networks
  • Kinematic Wave
  • gravity force balanced by friction force
  • attenuated delayed outflow due to channel
    storage
  • applicable only to branched networks
  • Dynamic Wave
  • solves full St. Venant eqns.
  • accounts for channel storage, backwater effects,
    pressurized flow, and reverse flow
  • applicable to any network layout
  • requires smaller time step

15
Flow Routing Algorithms in SWMM5
  • Steady Flow Routing
  • Actually just sums instantaneous subcatchment
    runoff for all subcatchments upstream of the
    selected channel
  • Kinematic Wave
  • Uniform, unsteady flow
  • No backwater, no surcharge, tree branch systems
    only unless flow splits are input
  • Dynamic Wave
  • Non-uniform, unsteady flow
  • Backwater, surcharge, looped or parallel sewers,
    street routing of flooded sewer manholes

16
General Conceptual ModelFor Dynamic Wave
17
Link and Node Properties
18
Hydraulic Boundary Condition at Nodes
Grelev(NN,1)
Grelev(NN,2)
19
Node Flooding Options
20
Surface Routing of Flood Flows
21
Conceptual Representation of the Dynamic Routing
Algorithm
22
Basic Flow Equation
23
Continuity Equation
24
Flow Cases Covered in Dynamic Routing Algorithm
25
Flow Cases Covered in Dynamic Routing Algorithm
26
Flow Cases Covered in Dynamic Routing Algorithm
27
Conceptual Representation of Storage in SWMM
28
Orifices and Weirs
29
Representation of Weirs
30
Representation of Pump
31
EPA SWMM Web Site
http//www.epa.gov/ednnrmrl/swmm/
32
The SWMM-USERS List Server
List servers provide a means for subscribers to
get quick answers to questions and participate in
discussions relating to the list server topics.
Subscription is free, and subscribers receive all
the e-mail that is sent to the list and can in
turn send e-mail to the list. The SWMM-USERS
list server is a forum for users of the
public-domain USEPA SWMM program to share ideas
and ask questions on issues related to stormwater
management modeling. A searchable archive of past
questions and answers is available through our
SWMM QA database. To subscribe to a list, send
an email to listserv_at_listserv.uoguelph.ca. Do not
put anything in the subject line and, in the body
of the message, include the following line (with
NO other text and no brackets) SUBSCRIBE
SWMM-USERS first name last name For
example, SUBSCRIBE SWMM-USERS JANE DOE
33
SWMM Wrappers With GIS Interfaces
  • XP SWMM XP Software (www.xpsoftware.com)
  • Mike SWMM DHI (www.dhisoftware.com)
  • InfoSWMM - MWH Soft (www.mwhsoft.com)
  • PC SWMM CHI (www.computationalhydraulics.com)

34
Homework
1. Download SWMM5 from the EPA
Website http//www.epa.gov/ednnrmrl/models/swmm/i
ndex.htm 2. Download the Users Manual 3. Page
through the Users Manual so you are familiar
with it 4. Look at the tutorial and be prepared
to run it in class on Thursday
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