Modelling Urban Runoff Quantity using Storm Water Storm Water Management (SWMM)

Prepared byKamal Ahmed

(PA123084)

SupervisorDr. Shamsuddin Shahid

Introductiono EPA's Storm Water Management Model (SWMM) is used throughout

the world for planning, analysis and design related to stormwater runoff, combined and sanitary sewers, and other drainage systems in urban areas.

o SWMM is a comprehensive hydrological and water quality simulation model used for single or continuous events of runoff in urban areas.

o Stormwater monitoring programs in urban catchment are crucial for characterizing the quality of stormwater runoff and formulate effective pollution control strategy.

o SWMM tracks the flow rate, flow depth, and quality of water in each pipe and channel during a simulation period made up of multiple time steps.

Introduction SWMM 5 has recently been extended to model the

hydrologic performance of specific types of low impact development (LID) controls.

The LID controls that the user can choose include the following seven green infrastructure practices:o Bio-Retension cell o Rain gardenso Green roofso Street planterso Rain barrelso Infiltration trencheso Vegetative swales

Model parameterization SWMM requires three major information for runoff quantity

modelling: (1) Physical Catchment Characteristics(2) Rainfall(3) Infiltration

The physical catchment data are (a) Total catchment area (A)(b) Percentage of impervious area (%Imp)(c) Catchment width (W)(d) Average slope (So)(e) Surface depression storage (f) Surface roughness

Study Area

Parking Lots

Landuse

Catchments

Sub catchment Area Width Slope

S1 103 597 4

S2 41 377 3

S3 59 750 7

S4 53 592 8

S5 17 520 2

S6 11 347 2

S7 42 705 1

S8 34 259 2

Sub catchment Area Width SlopeS1 103 597 4

S2 41 377 3

S3 59 750 7

S4 53 592 8

S5 17 520 2

S6 11 347 2

S7 42 705 1

S8 34 259 2

Horton Infiltration

Junction Invert Elevation

J1 29

J2 23

J3 21

J4 18

J5 17

O 16

Conduits Length

C1 2404

C2 2204

C3 1295

C4 1584

C5 4159

THANK YOU