Things that Happened Before You were Born

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Things that Happened Before You were Born

• (The earth and SWMM were created)
• a story by
• Dr. Larry A. Roesner, Ph.D.,P.E.
• based (loosely) on biblical quotes
• and his own bigger than life experiences

Actually very loosely
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The earth and SWMM parallels

• In the beginning, there was the Rational Method

Qpeak CI A
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The earth and SWMM parallels
And darkness covered the drainage world because
of the limited applicability of the Rational
Method
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The earth and SWMM parallels

• Then forward looking engineers said let there be
  light

• And so, they created more rational models
• SCS TR20 and TR55
• HEC-1,2,3,4,5,6, and RAS
• SWMM

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The earth and SWMM parallels

• SCS Method accounts for initial soil moisture and
  time varying C
• Runoff hydrographs can be computed

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The earth and SWMM parallels

• HEC model produces runoff hydrograph from
  rainfall hyetograph using unit hydrograph
  technique (Who knows the Schneider coefficient
  for a 30 pervious urban area? )
• Hydrologic routing produces channel flows
• Hec 2 computes steady state backwater through
  maximum discharge profile

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The earth and SWMM parallels

• SWMM was to be the mother of all models
• It would trace runoff from its point of origin,
  through the stormwater system to and through the
  receiving waters, computing flows and water
  levels
• It would trace wet weather pollution from its
  point of origin to its final fate in the
  receiving waters

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Concept of SWMM
Rainfall hyetograph
Watershed Data
RUNOFF
Q (t) C(t)
Q (t)
Inlets
Transport System Data
Transport System Data
EXTRAN
TRANSPORT
Q (t)
Q (t) C(t)
Outfalls
Point Source Loads
Receiving Water System Data
RECEIVE
Q (t), C(t) in Receiving Water
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The earth and SWMM parallels
And so it was, and (most) Civil Engineers saw the
models and they were good.
for 30yrs!!?

• And so they rested,

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SWMM Runoff Module
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SWMM Extran Module
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INTRODUCTION TO SWMM AND MIKE SWMM

• CE 580 Analysis of Urban Water Systems
• Dr Larry Roesner,
• Colorado State University

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This presentation is an embellishment of the road
culvert example contained in the Mike SWMM
documentation. In order to see the results of
road overtopping, the weirs at nodes 110 and 60
have been changed to box conduits. Three
simuations were performed o The "existing"
condition File name Exam11e.dat - culvert 110
diameter 1.0 ft - culvert 60 diameter 3.0
ft o The "existing" condition File name
Exam11p1.dat - culvert 110 diameter 2.0
ft - culvert 60 diameter 3.5 ft o The
"existing" condition File name Exam11p2.dat -
culvert 110 diameter 4.0 ft - culvert 60
diameter 5.0 ft The first simulation shows
severe overtopping of the road at both location,
with prolonged backwater at junction 110. The
second simulation shows much improvement, and the
third simulation shows the problem fixed except
for a small 15 minute overtopping of the the road
at junction 110. Modifications by LAR 12/2/98
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Camp Dresser McKeeDanish Hydraulic Institute

• The power of two...

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Danish Hydraulic Institute- a Consulting and
Research Organization

• Objectives
• to develop and apply advanced methods and
  technologies
• within hydraulic and hydrological engineering
• to provide specialised consulting services
• to contribute to the technological development
  through
• international research collaboration and through
• transfer of know-how and technology

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MIKE SWMM
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MIKE 11

• 1-D modeling system for rivers and channels
  
• HD, AD, WQ, ST, FF, GIS
• more than 400 users world-wide

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MIKE 21

• a modelling system for estuaries, coastal waters
  and seas
• more than one hundred users in 35 countries

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MIKE SHE

• an integrated hydrological modeling system
• 3-D Groundwater movement, unsaturated zone,
  Solute transport, dynamic link to MIKE 11
• some 50 users in 10 countries

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MIKE BASIN

• Water Master Planning
• use of available water resources
• planning for future water developments
• GIS
• defining the network
• evaluating results
• integrated analysis with spatial data

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LITPACK

• an integrated modelling system for Littoral
  Processes And Coastline Kinetics
• more than 60 users in 20 countries

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Road Elev.
Road Elev.
Junction 110
Junction 60
Road
Road
Culvert
Culvert
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Road Elev.
Road
Culvert
Junction 110
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Road Elev.
Road
Culvert
Junction 110
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Road Elev.
Road
Culvert
Junction 110
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Road Elev.
Road Elev.
Junction 110
Junction 60
Culvert
Culvert
Road
Road
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Modeling an Urban Development with MIKE-SWMM

• Presented by Melissa Figurski
• CE 394K.2 Surface Water Hydrology
• Term project, Spring 2001

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Site Layout
24.17 acres 46.8 Impervious
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Design Approaches
Who cares about the environment anyway
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MIKE-SWMM Evaluations

• Pre-development
• Natural runoff
• Post-development
• Sewer system pipe runoff
• Grassy swale to detention pond runoff

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Design Criteria, City of Austin

• Drainage Criteria Manual detention ponds
• Ponds shall be designed to reduce
  post-development peak rates of discharge to
  existing pre-development peak rates of discharge
  from the 2, 10, and 25 year storm events at each
  point of discharge from the project or
  development site.
• Environmental Criteria Manual runoff treatment
  volume
• one-half inch of runoff plus an additional
  one-tenth inch for each ten percent increase of
  gross impervious cover over twenty percent within
  the drainage area to the control

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Design Storms for Austin, Texas

• Technical Paper 40

Used SCS Type-II Distribution
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Undeveloped Site 10-year storm
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Site Layout
24.17 acres 46.8 Impervious
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Developed Site Obtaining Watershed Parameters
Does anyone know how to use this thing?!?!
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Developed Site Obtaining Watershed Parameters
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Drainage Schematic
For Pipe Flow
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RUNOFF Block
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EXTRAN Block
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Developed Site concrete drainage with no
controls
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Developed Site concrete drainage with no
controls
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Developed Site Grass Drainage
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Developed Site Grass Drainage
but theres more work
to be done!
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MIKE-VIEW
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Pond Sizing
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Pond Sizing
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Pond Sizing
10-year Storm Storage 126,134.8 ft3 2-year
Storm Storage 77,582.38 ft3
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Pond Sizing
Stage-Storage Table
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Almost There

• Input Pond Stage/Storage Data into MIKE-SWMM
• Size Pond Outfall Structures for 2 and 10-year
  Storms
• Convince World to Use Swales