Hydrolatinamerica is a student project which regroups students, interested in the field of water resources, from many countries, mainly from South-America. The problematic of the meeting is to build a hydraulic model with the software EPA SWMM to understand the dynamic hydrologic and hydraulic of a specific given area and then be able to analyze the results to find some solutions in order to optimize the results.
Here is the daily report number two which describes the different activities of the group during the second day. During this day we developed our different tasks following the objectives set at the end of the precedent day, with everyone working on its tasks and exchanging information when needed. As it was described in the schedule, during the second day we finished the discretization, advanced the construction of the model and began the calibration.
On day 2, in the morning we were able to finish the catchment area discretization and the sub-catchment areas as well. The refinement took account the blocks’ shapes, estimated roof’s slope directions and existing drainage system.
Figure: complete discretization

The next phase was to put all this information altogether on the EPA SWMM software, divided into these steps:
 adding the study area components: subcatchments, junctions, storm sewer conduits and a rain gage;
 setting object properties and;
 running a simulation
To estimate the impermeability indexes we used satellite images from Google Earth that indicated urban conformation, to deduce land use.
Figure: visualization of the building model – EPA SWMM
The process of calibration consists in comparing a measured precipitation and its flow with the modeled output.
The values to be compared shall be:
 peak flow rate and;
 total volume.
At the moment the group wasn’t able to finished all the calculations and do a proper comparison. This task is scheduled to be finished on the next day.