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Alternative Drainage Techniques : Infiltration
Team 3
Ariel Marcelo Ravelli (Argentina)Lina Mabel (Chile)
Vinícius de Mello Moutinho (Brasil)
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• Theme Presentation• Case of Study• Rain and Modeling• Adopted Solution• Results
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Theme Presentation
Drainage Alternative Forms
•Trenches
•Storage Rooftops
•Permeable Pavement
•Infiltration Basins
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Case of Study La Riereta basin, Saint Boi Llobregat
Basin 100% impermeable
1% to 7% average slopes
Area of 18 ha
Unitary Drainage System
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SubCatchmentTotal Area
(m²)Permeable Area (m²)
L (m) Width % per. %imp %slope
1 9627,97 308,34 173,56 330,93 3,20% 96,80% 1,64%
2 6714,73 528,12 149,72 272,77 7,87% 92,13% 1,64%
31 6630,54 62,82 174,72 349,44 0,95% 99,05% 3,48%
4 19994,75 151,16 266,13 473,10 0,76% 99,24% 1,54%
5 17776,41 0,00 223,07 431,95 0,00% 100,00% 2,61%
6 13875,27 690,36 152,7077 263,94 4,98% 95,02% 3,75%
7 9769,22 0,00 103,39 169,39 0,00% 100,00% 0,91%
8 11239,69 28,19 149,67 237,82 0,25% 99,75% 4,19%
9 24536,38 121,50 154,46 247,59 0,50% 99,50% 4,26%
10 19494,04 0,00 206,32 355,79 0,00% 100,00% 1,07%
11 7302,09 0,00 183,82 367,64 0,00% 100,00% 3,30%
12 10973,80 1155,76 101,39 154,63 10,53% 89,47% 1,74%
13 10827,35 2960,82 127,58 188,33 27,35% 72,65% 5,96%
14 8397,599 0 120,1996 214,40 0,00% 100,00% 4,42%
[1] These subcatchments had it´s width calculated as symmetrical, W= 2*L, while the others were calculated as asymmetrical, W=(2 - Sk) x L, Sk= (A2 – A1)/ A
Subcatchments Features
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Rain and Modeling
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Rain and Modeling
3 Rains: Jordi, Fidel and Martina
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Rain and Modeling
Calibration : Fidel
First Round Last Round
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Rain and Modeling
Validation : Jordi
Error: peak: 0.4% volume: 34%
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Project Rain
0
50
100
150
200
250
0:00
0:05
0:10
0:15
0:20
0:25
0:30
0:35
0:40
0:45
0:50
0:55
1:00
Time (min)
Inte
ns
ity
(m
m/h
)
Project Rain
Reduced Project Rain
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Project Rain
Full Rain Reduced Rain
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Local Problem
************************** Volume Volume
Flow Routing Continuity hectare-m 10^6 ltr
************************** --------- ---------
Dry Weather Inflow ....... 0.000 0.000
Wet Weather Inflow ....... 0.466 4.664
Groundwater Inflow ....... 0.000 0.000
RDII Inflow .............. 0.000 0.000
External Inflow .......... 0.000 0.000
External Outflow ......... 0.270 2.699
Internal Outflow ......... 0.190 1.896
Evaporation Loss ......... 0.000 0.000
Initial Stored Volume .... 0.000 0.000
Final Stored Volume ...... 0.006 0.063
Continuity Error (%) ..... 0.130
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Solutions
• Reduce Impermeable Area
• Combined Solution
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Solutions
• Reduce Impermeable Area from 100% to 0%
************************** Volume Volume
Flow Routing Continuity hectare-m 10^6 ltr
************************** --------- ---------
Dry Weather Inflow ....... 0.000 0.000
Wet Weather Inflow ....... 0.088 0.883
Groundwater Inflow ....... 0.000 0.000
RDII Inflow .............. 0.000 0.000
External Inflow .......... 0.000 0.000
External Outflow ......... 0.072 0.716
Internal Outflow ......... 0.009 0.088
Evaporation Loss ......... 0.000 0.000
Initial Stored Volume .... 0.000 0.000
Final Stored Volume ...... 0.007 0.066
Continuity Error (%) ..... 1.396
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Solutions
• Combined Solution
• Imper. Area – 60%
• CN – 60
• Infiltration Basin
• Shallow Trenches
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Solutions
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Solutions
Total Volume Reduction : 88%
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Conclusions
100% to 0% we still had a flood, an amount of 0.46% of the inicial flood.
Combined solution, we were able to reduce the soil impermeability from 100% to 60%, and using the infiltration basin and the trenches, we reduced the total flood from 1.896 x 106 to only 0.230 x 106 ltrs, a total reduce of 88%
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Problems
Good Management Required