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Things that Happened Before You were Born

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... runoff hydrograph from rainfall hyetograph using unit hydrograph technique (Who ... Rainfall hyetograph. Watershed Data. Q (t) Q (t) C(t) Q (t) C(t) Q (t) ... – PowerPoint PPT presentation

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Title: Things that Happened Before You were Born


1
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
2
The earth and SWMM parallels
  • In the beginning, there was the Rational Method

Qpeak CI A
3
The earth and SWMM parallels
And darkness covered the drainage world because
of the limited applicability of the Rational
Method
4
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

5
The earth and SWMM parallels
  • SCS Method accounts for initial soil moisture and
    time varying C
  • Runoff hydrographs can be computed

6
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

7
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

8
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
9
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,

10
SWMM Runoff Module
11
SWMM Extran Module
12
INTRODUCTION TO SWMM AND MIKE SWMM
  • CE 580 Analysis of Urban Water Systems
  • Dr Larry Roesner,
  • Colorado State University

13
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
14
Camp Dresser McKeeDanish Hydraulic Institute
  • The power of two...

15
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

16
MIKE SWMM
17
MIKE 11
  • 1-D modeling system for rivers and channels
  • HD, AD, WQ, ST, FF, GIS
  • more than 400 users world-wide

18
MIKE 21
  • a modelling system for estuaries, coastal waters
    and seas
  • more than one hundred users in 35 countries

19
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

20
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

21
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
39
Road Elev.
Road
Culvert
Junction 110
40
Road Elev.
Road
Culvert
Junction 110
41
Road Elev.
Road
Culvert
Junction 110
42
Road Elev.
Road Elev.
Junction 110
Junction 60
Culvert
Culvert
Road
Road
43
Modeling an Urban Development with MIKE-SWMM
  • Presented by Melissa Figurski
  • CE 394K.2 Surface Water Hydrology
  • Term project, Spring 2001

44
Site Layout
24.17 acres 46.8 Impervious
45
Design Approaches
Who cares about the environment anyway
46
MIKE-SWMM Evaluations
  • Pre-development
  • Natural runoff
  • Post-development
  • Sewer system pipe runoff
  • Grassy swale to detention pond runoff

47
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

48
Design Storms for Austin, Texas
  • Technical Paper 40

Used SCS Type-II Distribution
49
Undeveloped Site 10-year storm
50
Site Layout
24.17 acres 46.8 Impervious
51
Developed Site Obtaining Watershed Parameters
Does anyone know how to use this thing?!?!
52
Developed Site Obtaining Watershed Parameters
53
Drainage Schematic
For Pipe Flow
54
RUNOFF Block
55
EXTRAN Block
56
Developed Site concrete drainage with no
controls
57
Developed Site concrete drainage with no
controls
58
Developed Site Grass Drainage
59
Developed Site Grass Drainage
but theres more work
to be done!
60
MIKE-VIEW
61
Pond Sizing
62
Pond Sizing
63
Pond Sizing
10-year Storm Storage 126,134.8 ft3 2-year
Storm Storage 77,582.38 ft3
64
Pond Sizing
Stage-Storage Table
65
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
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