8/13/2019 Catchment Presentation LaRiereta

1/9

1

La Riereta catchment:

Description and monitoring of

an urban catchment in the

municipality of Sant Boi de

Llobregat

Rodrigo Concha Jopia

Manuel Gmez Valentn

Grupo Flumen UPC

Barcelona

Content

Description of La Riereta catchment

Topographic data

Rainfall and flow registered data

8/13/2019 Catchment Presentation LaRiereta

2/9

2

SpainSant Boi de Llobregat

LaLa RieretaRiereta urban catchmenturban 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 ofBarcelona

Population:

80000

inhabitants

Mediterranean

weather

8/13/2019 Catchment Presentation LaRiereta

3/9

3

Sant Boi de Llobregat

Flood Problems in Sant Boi de Llobregat

Zone in the old town, with flood problems

8/13/2019 Catchment Presentation LaRiereta

4/9

4

Morphology of the territory

Deltaic zone ofthe Llobregat,

near the river

mouth, close to

the foothills of

the Garraf

mountains

Barcelona

Llobregat river

Hydrological characteristics of La

Riereta catchment

Total area: 18 Ha

Surface slopes of

7 % to 1 %

Very impervious

surface

Llobregat river

8/13/2019 Catchment Presentation LaRiereta

5/9

5

La Riereta: main combined sewer

network

Catchment boundary

Flow measurement

point

Rainfall

measurement point

Topographical data

8/13/2019 Catchment Presentation LaRiereta

6/9

6

Topographical data

Raw topographicaldata contained in aCAD file:

- Manholes rimand invertelevations (not at

all)- Conduits crosssections

Rainfall registered data

Pluviometer Model Campbell

Scientific ARG-100

Record of the

intensities and of

the total rain

8/13/2019 Catchment Presentation LaRiereta

7/9

7

Flow Measurement

Velocity measurement,

v, with sensor of

electromagnetic type

Level measurement, y,

by means of a

piezoresistive sensor

Q = v xA (y)Q =Q = wealthwealthV =V = speedspeed happenshappens

A =A = areaarea

Band of assembly(montage)

Sensor

Model used

Flo-tote (Marsh McBirney)

8/13/2019 Catchment Presentation LaRiereta

8/9

8

Calibration of the flowmeter in situ

Field Information obtained

Measurements of rain and f low in

significant events Selection of the rain events, in agreement

with the Manual Sewer Rehabilitation (WRc

1994)

Minimal rainfall: 5 mm

8/13/2019 Catchment Presentation LaRiereta

9/9

Quality Analysis of the field data

Checking of informationassociated to hyetogaphs

Scattergraphs ofQ/y data

Rainfall and flow registered data

Jordi

0

5

10

15

20

25

30

35

40

Intensidadmm/h

0.00

0.20

0.40

0.60

0.80

1.00

1.20

113

25

37

49

61

73

85

97

109

121

133

145

157

169

Tiempo (min)

Caudal(m3/s)

Inte ns i da d C au da l

Martina

0

2

4

6

8

10

12

14

16

18

Intensidadmm/h

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

110

19

28

37

46

55

64

73

82

91

100

109

118

Tiempo (min)

Caudal(m3/s)

Intensidad Caudal