Experimental Infiltration Trench Simulation: Evaluation of Softwares Performance (PAP014959)
Marla Josefa Nem Mujovo, ALEXANDRA RODRIGUES FINOTTI, Vladimir Caramori Borges de Souza
The inundation control in urban area is most important activity for reduce the development problem of urban inundation resulting from the process. The Best management practices in urban drainage and infiltration trenches specifically are used often to reduce runoff through forced water infiltration to recharge aquifers. In this work evaluate the performance of two free distribution computer programs in modelling infiltration trenches to the control of urban drainage, so that it can be used as a management appliance in order to assist in decision making by facilitating the implementation of best management practices in urban drainage. Developed a infiltration trench conceptual based on bibliographic revision for the hydrological and hydraulic characteristics. The infiltration trench conceptual was tested with the HYDRUS 1D and CHEMFLO programs, the data from a trench located at the Instituto de Pesquisas Hidráulicas (IPH-UFRGS) located in south of Brazil studies by Souza ( 2002). The programs were calibrated with experimental data and after two rainfall events monitored in the trench were simulated in calibrated software. Compared flow out of the trench and the water level inside the trench for HYDRUS -1D program, CHEMFLO the results were compared with the output volume of the trench and the accumulated water level into the trench. The level of water in the trench for both models was performed using the difference between the height profile of saturated cells. Statistical error estimators presented by Wilmont et al. (1985) were used for comparison between simulation and monitored data . Finally the evaluation matrix of infiltration simulation programs has been developed to assess its applicability in the process of decision making in the selection of control techniques urban drainage, based on criteria which best showed the operation of the experimental trench Best Management Practices in urban drainage" and must satisfy the quantitative protocol for assessing environmental impacts to cause by the control structures of urban drainage underground environment. Both programs showed satisfactory results for events lasting less rain and presenting medium intensity rain. The HYDRUS -1D program had the best features of calibration and satisfactory results in the representation of flow through the soil profile. The test programs demonstrated that the simulation of control structures based on infiltration drainage is feasible but requires a large set of data to characterize the medium, discrete precipitation data and a satisfactory of user modeling in terms of the medium partially saturated. Through the evaluation matrix has been observed that the limitations presented CHEMFLO program for the various chosen criteria is that the program does not respond accurately to the protocol quantitative assessment of the Best Management Practices in urban drainage into account the hydraulic and hydrological characteristics of structures, what differentiates the analysis done for the HYDRUS -1D program, which presented evaluation criteria that allow response protocol for the quantitative assessment of Best Management Practices in urban drainage as a tool to assist in decision making."