modelling and analysis of ees systems using swmm. darko joksimovic - modelling... · modelling and...

Modelling and Analysis of EES

Systems Using SWMM

Darko Joksimovic

Department of Civil Engineering, Ryerson University, Toronto

July 24th 2015

Toronto, Ontario, Canada

Planning and Design of a Right-of-Way LID (Etobicoke Exfiltration System)

EES Elements

SWMM Model Development

Model testing

Model application

Conclusions and future work

EES Elements to Capture in a Model

Inlet

Trench

D/S Plug

EES Elements


Model testing

Model application


No explicit elements to simulate EES

Representing EES in SWMMStorm sewer + two perforated pipes

Does not include storage interaction and capacityDoes not restrict the flow to downstream MH (need dummy nodes)


2

EES Elements


Model testing

Model application



Representing EES in SWMMStorm sewer + trench (link) + dummy node

Adjustments to geometry to represent void space in the trenchAdjustment to infiltration rate (mm/hr)



Representing EES in SWMMStorm sewer + 2 orifices+ storage (node)

Geometry to represent void space in the trenchAdjustment of infiltration rates to surrounding soil for revised

geometry (revised in recent SWMM versions from Green-Ampt to mm/hr)

EES Elements


Model testing

Model application




Representing EES in SWMMStorm sewer + 2 orifices+ storage + pumping

Storage (stage-area) and pump curves in ExcelRepresenting each element separately allows flexibility

Sensitivity analyses Analyses of results Future changes

EES Elements


Model testing

Model application




What is NOT modelled

Detailed inlet hydraulicsPrevious monitoring left questions regarding restricted flow to perforated pipesChanges to orifice coefficients

Flow in the trench

Flow through geotextileWrapping of the perforated pipesTrench

Long term changesClimateDrainage area characteristicsPerforated pipe cloggingTrench cloggingSurrounding soil infiltration rates

EES Elements


Model testing

Model application



EES Elements


Model testing

Model application


Infiltration rate of surrounding soil the main adjustment parameter

SWMM Model Testing (Etobicoke Data)

EES Elements


Model testing

Model application


Conventional (existing) drainage model

SWMM Model Application

EES Elements


Model testing

Model application


Model calibrated using recorded pond levels


EES Elements


Model testing

Model application


Conventional (existing) drainage model


EES Overlaid

EES Elements


Model testing

Model application


Long-term performance of each system simulated using the developed models in PCSWMM

Pearson Airport hourly rainfall data (April – October, 1960-2012 with missing years)

11


0

100

200

300

400

500

600

700

800

J5 J1 J6 J12 J2 J3 J7 J4 J27 J8 J23

J11

J15

J16 J9 J10

J17

J13

J18

J14

J19

J20

J21

J22

J24

J25

J26

J30

J28

J29

Inflo

w Volum

e (106

m³)

Node ID

Runoff Total (EES) Total (Conventional)

EES Elements


Model testing

Model application


Drainage system inflows

12


‐

200

400

600

800

1,000

1,200

C9 C13

C23

C26

C10 C1 C5 C2 C11 C3 C6 C12 C4 C30

C18

C19

C20 C7 C8 C14

C15

C16

C17

C21

C22

C24

C25

C27

C29

C28

Max

imum

Flow (L

/s)

Link ID

EES Conventional

EES Elements


Model testing

Model application


Drainage system (pipe flow) utilization

13


EES Elements


Model testing

Model application


Drainage system (pipe capacity) utilization

14


0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

C9 C13

C23

C26

C10 C1 C5 C2 C11 C3 C6 C12

C4 C30

C18

C19

C20 C7 C8 C14

C15

C16

C17

C21

C22

C24

C25

C27

C29

C28

Max

imum

Perce

nt Utiliz

ed

Link ID

EES Conventional

0

10

20

30

40

50

60

70

80

90

100

SU1

SU10

SU11

SU12

SU13

SU14

SU15

SU16

SU17

SU18

SU19

SU2

SU20

SU21

SU22

SU23

SU24

SU25

SU26

SU27

SU3

SU4

SU5

SU6

SU7

SU8

SU9

Max

imum

Perce

nt Utiliz

ed

Trench Storage ID

EES Elements


Model testing

Model application


Trench storage utilization

15


EES Elements


Model testing

Model application


Flow duration

16


0

200

400

600

800

1,000

1,200

0.0 0.1 1.0 10.0 100.0 1,000.0 10,000.0

Flow Rate (L/s)

Duration of Exceedance (hrs)

Pond Inflow (EES) Pond Outflow (EES)

Pond Inflow (Conventional) Pond Outflow (Conventional)

EES Elements


Model testing

Model application


Water balanceConventional

With EES

17


2,366

Rainfall Volume

1,269

424

678

Surface Infiltration ET Surface Runoff

1,269

424

574

104

678

Surface Infiltration ET Infiltrated by EES Pond Discharge

EES Elements


Model testing

Model application


Modelling of EES can be accomplished in several ways using SWMM

Orifice-storage-pump representation used in this studyAdvantages: simple and clear representation of each process Disadvantage: computationally expensive (long simulation times)Simpler approaches to be explored

Model testing using monitored data satisfactory

Comparison of conventional drainage system and conventional drainage system w/EES

Runoff volume infiltrated by the EES significant (>80%)Minor system peak flows reducedMaximum pipe capacity utilization still high with EES (large events)Maximum storage trench utilization ranging between 50% and 70%,

indicating trench inflow capacity as a limiting factor (?)Drastic modification in Flow-Duration curves and water balance

More analysis of existing results

Optimization of placement/sizing of perforated pipes

Physical modelling of the system for further development

Summary and Future Work

Questions?Acknowledgements:

Carol Liu, Town of Richmond Hill

modelling and analysis of ees systems using swmm. darko joksimovic - modelling... · modelling and...

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