1

Study of the case “La Riereta”Urban Drainage basin

Team 1 Maximiliano Cavenaghi

Kattia Arnez FerrelDiego Alves Melo

Jorge MaregaRamiro Marcus

2

MethodologyDelimitation and discretization of study

area.Determination of hydraulic parameters.Determination of effective rainfall.Obtaining the storm design.Modelation with the SWMM program.Modification to the drainage system.

3

Study Area- “La Riereta”BasinTotal area: 17.99

HectaresHigh percentage of

impervious areasCombined sewer

systemCircular Sections Concrete

4

Discretization of basin

Total Sub basins: 18

Basin Roughness: 0.0015

Conduit Roughness: 0.01

5

Calibration Fidel eventDetermination of effective rainfall

PT=PE+PP

For the cablibration the N impervious was changed to 0.0015 and also the time steps.

00:00 01:12 02:24 03:36 04:48 06:00 07:120

0.05

0.1

0.15

0.2

0.25

0.3

0.35

obscal

Time (Hour)

Flo

w (

m3/

s)

FIDEL

FlowQp tp

[m3/s] [hour]Measure

d 0.21 01:13Calculat

ed 0.31 02:25Er [%] 46 99

6

Validation Jordi and Martina EventJordi Event Martina event

23:45 00:14 00:43 01:12 01:40 02:09 02:38 03:07 03:360

0.2

0.4

0.6

0.8

1

1.2Obs

Cal

Time [Hour]

Flo

w [

m3/

s]

23:45 00:14 00:43 01:12 01:40 02:09 02:38 03:07 03:360

0.05

0.1

0.15

0.2

0.25

0.3

0.35ObsCal

Time [Hour]

Flo

w [

m3/

s]

JORDI

FlowQp tp

[m3/s] [h:min]Measure

d 1.01 01:09Calculat

ed 0.94 01:10Er [%] -7 1

MARTINA

FlowQp tp

[m3/s] [h:min]Measure

d 0.16 01:32Calculat

ed 0.29 01:30Er [%] 81 -2

7

Design TormentT= 10

AñosD= 1

Hora

8

Problems in the drainage system

9

Problems in the drainage system

10

Solution Proposal

11

Solution ProposalTiempo de inundación N-31 15 minTiempo de inundación N-33 55 min

Tiempo de inundación N-31 1 minTiempo de inundación N-33 1 min

Area 1

12

Solution ProposalFlooding time:12 min Flooding time:1 min

Area 2

13

Solution ProposalTiempo de inundación 5 min

Tiempo de inundación 2 minArea 3

14

ConclusionFlooding succesfully controlled with the

proposed alternatives.New drainage system larger and more

expensive than the current system.Spots with flooding ocurring for a minimum

timeIntegration of various techniques in order to

minimize costs and impacts of drainage works in urban areas