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Retrofitting of road gutters with an infiltration-exfiltration system for stormwater control
1. Infiltration-exfiltration system for
stormwater control: a full scale test
Mariana Marchioni(1), Gianfranco Becciu(1), Claudio Oliveira(2)
(1) Politecnico di Milano
(2) Universidade São Judas Tadeu
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Infiltration rate
Infiltration rate was
measured using a
falling head permeter
according
ABNT NBR 61416.
Permeameter diameter 30 cm
Water head level during test: 10-15
mm
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Infiltration rate
TEST DATE INFILTRATION RATE
[m/s] [mm/h]
02/10/2019 6,00E-04 2174
17/10/2019 1,60E-03 5767
23/10/2019 4,90E-03 17786
After a rainfall event on beggining of
October the IES got clogged due to
the garden area soil contribuition,
resulting the infiltration rate
obtained on 02/10/2019.
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Infiltration rate
The IES was cleaned using
pressure water and the infiltration
rate was measured again on on
23/10/2019.
TEST DATE INFILTRATION RATE
[m/s] [mm/h]
02/10/2019 6,00E-04 2174
17/10/2019 1,60E-03 5767
23/10/2019 4,90E-03 17786
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• An infiltration-exfiltration system (IES) with 18.8 m length and 0.49 m
width was build to receive rainfall from a 1617m2 contribution area.
• The IES consists on a pervious concrete layer (10 cm) and gravel
layer (20 cm) and is connected to the drainage system through a 10
cm diameter PVC pipe.
• The IES infiltration rate was measured after a rainfall event
presenting a 2174 mm/h. After cleaning with pressure water the
infiltration rate raised to 17786 mm/h.
• The pervious concrete layer present a 20,8 MPa compressive
strength; 2,43 MPa (average) flexural strength and 2,32 MPa
diametral compressive strength for 28 days age.
• Samples extracted presented a 14,3% of void content.
• Rainfall-runoff simulation for the proposed IED did not registerd peak
flow and volume reduction comparing pre and post-retrofit.
Research summary
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• Urbanizations scenario requires a shift on stormwater management
philosophy encouraging the adoption of SUDS;
• An IES system is proposed to be placed on road gutters to provide
runoff peak flow and volume reduction, avoid ponding, inlet clog and
promote load removal;
• The proposed system pervious concrete layer showed a high
infiltration rate and acceptable mechanical characteristics;
• Contributions area characteristics (i.e, a garden area) should be
counted during the design to avoid early clogging;
• The rainfall-runoff modelling of the IES did not present the aimed
performance regarding runoff peak flow and volume reduction;
• A deeper gravel depth, an offset pipe placement and a flow restrictor
are recommended to improve performance;
• The current conditions of the IES could still function to avoid ponding,
promote load removal and facilitates inlet drain maintenance.
Conclusion
40.
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• Measured rainfall-runoff data to calibrate
and validated the model;
• Measured and model load removal
parameters;
• Propose modifications on the IES design to
improve runoff peak flow and volume
reduction;
• Extrapolated results for basin level.
Conclusion
