Things that Happened Before You were Born (The earth and SWMM were created)

a story byDr. Larry A. Roesner, Ph.D.,P.E.based (loosely*) on biblical quotesand his own bigger than life experiences*Actually very loosely

The earth and SWMM parallelsIn the beginning, there was the Rational MethodQpeak = CI A

The earth and SWMM parallelsAnd darkness covered the drainage world because of the limited applicability of theRational Method

The earth and SWMM parallelsThen forward looking engineers said let there be lightAnd so, they created more rational modelsSCS TR20 and TR55HEC-1,2,3,4,5,6, and RASSWMM

The earth and SWMM parallelsSCS Method accounts for initial soil moisture and time varying CRunoff hydrographs can be computed

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 flowsHec 2 computes steady state backwater through maximum discharge profileThe earth and SWMM parallels

SWMM was to be the mother of all modelsIt would trace runoff from its point of origin, through the stormwater system to and through the receiving waters, computing flows and water levelsIt would trace wet weather pollution from its point of origin to its final fate in the receiving watersThe earth and SWMM parallels

Concept of SWMMRECEIVEEXTRAN TRANSPORTRUNOFFRainfall hyetographWatershed DataQ (t)Q (t)C(t)Q (t)C(t)Q (t)TransportSystemDataTransportSystemDataReceiving WaterSystem DataPoint SourceLoadsInletsOutfallsQ (t), C(t) in Receiving Water

The earth and SWMM parallelsAnd so they rested, And so it was, and (most) Civil Engineers saw the models and they were good.for 30yrs!!?

SWMM Runoff Module

SWMM Extran Module

INTRODUCTION TO SWMM AND MIKE SWMMCE 580 Analysis of Urban Water SystemsSession 10 Sept 25, 2000

SWMM Computer Program Layout

Interrelationship of theSWMM Blocks

SWMM Schematic

MIKE SWMM Demonstration

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

Camp Dresser & McKeeDanish Hydraulic InstituteThe power of two...

Danish Hydraulic Institute- a Consulting and Research OrganizationObjectives:to develop and apply advanced methods and technologieswithin hydraulic and hydrological engineeringto provide specialised consulting servicesto contribute to the technological development throughinternational research collaboration and throughtransfer of know-how and technology

MIKE SWMM

MIKE 111-D modeling system for rivers and channels HD, AD, WQ, ST, FF, GISmore than 400 users world-wide

MIKE 21a modelling system for estuaries, coastal waters and seasmore than one hundred users in 35 countries

MIKE SHE an integrated hydrological modeling system3-D Groundwater movement, unsaturated zone, Solute transport, dynamic link to MIKE 11some 50 users in 10 countries

MIKE BASINWater Master Planning use of available water resourcesplanning for future water developmentsGISdefining the networkevaluating resultsintegrated analysis with spatial data

LITPACKan integrated modelling system for Littoral Processes And Coastline Kineticsmore than 60 users in 20 countries

MIKE SWMM Demonstration

Junction 110Junction 60

RoadCulvertRoadCulvertRoad Elev.Road Elev.

Junction 110RoadCulvertRoad Elev.

Junction 110RoadCulvertRoad Elev.

Junction 110RoadCulvertRoad Elev.

Junction 110RoadCulvertRoadCulvertRoad Elev.Road Elev.Junction 60

Questions?