Alternative Drainage Techniques : Infiltration Team 3 Ariel Marcelo Ravelli (Argentina) Lina Mabel (Chile) Vinícius de Mello Moutinho (Brasil)
Theme Presentation Case of Study Rain and Modeling Adopted Solution Results
Theme Presentation Drainage Alternative Forms Trenches Storage Rooftops Permeable Pavement Infiltration Basins
Case of Study La Riereta basin, Saint Boi Llobregat Basin 100% impermeable 1% to 7% average slopes Area of 18 ha Unitary Drainage System
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% ,5462,82174,72349,440,95%99,05%3,48% ,75151,16266,13473,100,76%99,24%1,54% ,410,00223,07431,950,00%100,00%2,61% ,27690,36152, ,944,98%95,02%3,75% 79769,220,00103,39169,390,00%100,00%0,91% ,6928,19149,67237,820,25%99,75%4,19% ,38121,50154,46247,590,50%99,50%4,26% ,040,00206,32355,790,00%100,00%1,07% ,090,00183,82367,640,00%100,00%3,30% ,801155,76101,39154,6310,53%89,47%1,74% ,352960,82127,58188,3327,35%72,65%5,96% , , ,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
Rain and Modeling
3 Rains: Jordi, Fidel and Martina
Rain and Modeling Calibration : Fidel First Round Last Round
Rain and Modeling Validation : Jordi Error: peak: 0.4% volume: 34%
Project Rain
Full RainReduced Rain
Local Problem **************************Volume Flow Routing Continuityhectare-m10^6 ltr ************************** Dry Weather Inflow Wet Weather Inflow Groundwater Inflow RDII Inflow External Inflow External Outflow Internal Outflow Evaporation Loss Initial Stored Volume Final Stored Volume Continuity Error (%)
Solutions Reduce Impermeable Area Combined Solution
Solutions Reduce Impermeable Area from 100% to 0% ************************** Volume Flow Routing Continuity hectare-m10^6 ltr ************************** Dry Weather Inflow Wet Weather Inflow Groundwater Inflow RDII Inflow External Inflow External Outflow Internal Outflow Evaporation Loss Initial Stored Volume Final Stored Volume Continuity Error (%)
Solutions Combined Solution Imper. Area – 60% CN – 60 Infiltration Basin Shallow Trenches
Solutions
Total Volume Reduction : 88% **************************Volume Flow Routing Continuityhectare-m10^6 ltr ************************** Dry Weather Inflow Wet Weather Inflow Groundwater Inflow RDII Inflow External Inflow External Outflow Internal Outflow Evaporation Loss Initial Stored Volume Final Stored Volume Continuity Error (%)
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 x 106 to only x 106 ltrs, a total reduce of 88%
Problems Good Management Required