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PROJECT DESCRIPTION: REHABILITATION PROPOSALS APPLIED ON AN URBAN CATCHMENT MODEL, USING SWMM 5 AS MODELING TOOL

Rodrigo Concha JopiaFLUMEN Research GroupTechnical University of CataloniaBarcelona TECH

Julio de 2012 - Santa Fé, Argentina

CONTENT

Project description

Description of the La Riereta urban catchment

Topographic data

Rainfall and flow registered data

Introduction to SWMM 5

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PROJECT DESCRIPTION

MAIN OBJECTIVE: to make a specified study on the La Riereta urban catchment using SWMM 5 as modeling tool.

PROJECT DESCRIPTION

In order to complete this project, there will be different teams.

Specified objectives

to build a numerical model of La Riereta (common task for all teams)

to perform an analysis of La Riereta model considering a specified design storm (specific task for every team)

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PROJECT DESCRIPTION

COMMON TASK: to build a numerical model of La Riereta urban catchment

Discretization on several subcatchment

Determination of initial values for hydrologic and hydraulics parameter (subcatchment width, surface roughness, conduits roughness and so on)

Calibration and validation process

Modeling and analysis of your model under a T=10 years design storm

PROJECT DESCRIPTION

SPECIFIC TASKS: once the model has been done, each team must perform a specific task

Sewer network rehabilitation proposal modifying the network (change on sewer cross sections, sewer bottom slopes, etc) but plan layout can not be changed

Sewer network rehabilitation proposal using detention tanks

Application of SUDS (Sustainable Urban Drainage Systems) in order to decrease surface imperviousness index

Network analysis under a long-continue simulation

Sewer network security levels to avoid flooding and surcharge flow

Sewer network analysis only under Dry Weather Flows

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SpainSant Boi de Llobregat

La Riereta urban catchment

Located in Sant Boi de Llobregat, city near to Barcelona (Spain)

CHARACTERISTICS OF SANT BOI DE LLOBREGAT CITY

Sant Boi de Llobregat, city of the metropolitan area of Barcelona

Population: 80000 inhabitants

Mediterranean weather

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FLOOD PROBLEMS IN SANT BOI DE LLOBREGAT

Zone in the old town, with flood problems

MORPHOLOGY OF THE TERRITORY

•Deltaic zone of the Llobregat, near the river mouth, close to the foothills of the Garraf mountains

Barcelona

Llobregat river

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HYDROLOGICAL CHARACTERISTICS OF LA RIERETA CATCHMENT

Total area: 17 Ha approx

Surface slopes of 7 % to 1 %

Very impervioussurface

Llobregat river

LA RIERETA: MAIN COMBINED SEWERNETWORK

Catchment boundary

Flow measurementpoint

Rainfall measurement point

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TOPOGRAPHICAL DATA

TOPOGRAPHICAL DATA

Raw topographical data contained in a CAD file:- Manholes rim and invert elevations (not at all)- Conduits cross sections

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RAINFALL REGISTERED DATA

Pluviometer

• Model Campbell Scientific ARG-100

• Record of the intensities and of the total rain

FLOW MEASUREMENT

Velocity measurement, v, with sensor of electromagnetic type

Level measurement, y, by means of a piezoresistive sensor

Q = v x A (y)Q = wealth

V = speed happens

A = area

Band of assembly(montage)

Sensor

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CALIBRATION OF THE FLOWMETER IN SITU

FIELD INFORMATION OBTAINED

Measurements of rain and flow in significant events

Selection of the rain events, in agreement with the Manual Sewer Rehabilitation (WRc 1994)

Minimal rainfall: 5 mm

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QUALITY ANALYSIS OF THE FIELD DATA

Checking of information associated to hyetogaphs

Scattergraphs of Q/y data

SOME RAINFALL AND FLOW REGISTERED DATA

Jordi

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5

10

15

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Inte

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dad

mm

/h

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1

13

25

37

49

61

73

85

97

10

9

12

1

13

3

14

5

15

7

16

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Tiempo (min)

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3/s)

Intensidad Caudal

Martina

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Inte

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dad

mm

/h

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

1

10

19

28

37

46

55

64

73

82

91

10

0

10

9

11

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Tiempo (min)

Cau

dal

(m

3/s)

Intensidad Caudal