1. Alternative Drainage Techniques : Infiltration Team 3 Ariel Marcelo Ravelli (Argentina) Lina Mabel (Chile) Vinícius de Mello Moutinho (Brasil)

2. Theme Presentation Case of Study Rain and Modeling Adopted Solution Results

3. Theme Presentation Drainage Alternative Forms Trenches Storage Rooftops Permeable Pavement Infiltration Basins

5. Case of Study La Riereta basin, Saint Boi Llobregat Basin 100% impermeable 1% to 7% average slopes Area of 18 ha Unitary Drainage System

8. SubCatchment Total Area (m²) Permeable Area (m²) L (m)Width% per.%imp%slope 19627,97308,34173,56330,933,20%96,80%1,64% 26714,73528,12149,72272,777,87%92,13%1,64% 3131 6630,5462,82174,72349,440,95%99,05%3,48% 419994,75151,16266,13473,100,76%99,24%1,54% 517776,410,00223,07431,950,00%100,00%2,61% 613875,27690,36152,7077263,944,98%95,02%3,75% 79769,220,00103,39169,390,00%100,00%0,91% 811239,6928,19149,67237,820,25%99,75%4,19% 924536,38121,50154,46247,590,50%99,50%4,26% 1019494,040,00206,32355,790,00%100,00%1,07% 117302,090,00183,82367,640,00%100,00%3,30% 1210973,801155,76101,39154,6310,53%89,47%1,74% 1310827,352960,82127,58188,3327,35%72,65%5,96% 148397,5990120,1996214,400,00%100,00%4,42% [1] [1] These subcatchments had it´s width calculated as symmetrical, W= 2*L, while the others were calculated as asymmetrical, W=(2 - S k ) x L, S k = (A 2 – A 1 )/ A Subcatchments Features

9. Rain and Modeling

10. 3 Rains: Jordi, Fidel and Martina

11. Rain and Modeling Calibration : Fidel First Round Last Round

12. Rain and Modeling Validation : Jordi Error: peak: 0.4% volume: 34%

13. Project Rain

14. Full RainReduced Rain

15. Local Problem **************************Volume Flow Routing Continuityhectare-m10^6 ltr **************************--------- Dry Weather Inflow.......0.000 Wet Weather Inflow.......0.4664.664 Groundwater Inflow.......0.000 RDII Inflow..............0.000 External Inflow..........0.000 External Outflow.........0.2702.699 Internal Outflow.........0.1901.896 Evaporation Loss.........0.000 Initial Stored Volume....0.000 Final Stored Volume......0.0060.063 Continuity Error (%).....0.130

16. Solutions Reduce Impermeable Area Combined Solution

17. Solutions Reduce Impermeable Area from 100% to 0% ************************** Volume Flow Routing Continuity hectare-m10^6 ltr ************************** --------- Dry Weather Inflow....... 0.000 Wet Weather Inflow....... 0.0880.883 Groundwater Inflow....... 0.000 RDII Inflow.............. 0.000 External Inflow.......... 0.000 External Outflow......... 0.0720.716 Internal Outflow......... 0.0090.088 Evaporation Loss......... 0.000 Initial Stored Volume.... 0.000 Final Stored Volume...... 0.0070.066 Continuity Error (%)..... 1.396

18. Solutions Combined Solution Imper. Area – 60% CN – 60 Infiltration Basin Shallow Trenches

19. Solutions

20. Total Volume Reduction : 88% **************************Volume Flow Routing Continuityhectare-m10^6 ltr **************************--------- Dry Weather Inflow.......0.000 Wet Weather Inflow.......0.3053.046 Groundwater Inflow.......0.000 RDII Inflow..............0.000 External Inflow..........0.000 External Outflow.........0.1971.974 Internal Outflow.........0.0230.230 Evaporation Loss.........0.000 Initial Stored Volume....0.000 Final Stored Volume......0.0830.827 Continuity Error (%).....0.470

21. 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%

22. Problems Good Management Required