Adequacy Proposals for Hydrometric Equipment Setup to Enable Measurements of Water Stages and Velocities in Urban Stream (PAP014907)

Código

PAP014907

Autores

Anne Caroline Negrão, Daysy Lira Oliveira Cavalcanti, Rodrigo Martins de Almeida, Luisa Fernanda Ribeiro Reis

Tema

Urban Floods

Resumo

Field data survey is essential to feed modern tools of water resources planning, such as rain-runoff modeling. However, there are many difficulties involved in collecting such data. Thus, the rivers flowing through densely populated urban areas have characteristics that can greatly hinder the monitoring of hydrological quantities during flood waves. High stages and velocities achieved in a short time interval are peculiarities of the flow in urban channels that may hinder and compromise the reliability of such measures. This work reports the committed effort on installing equipment for monitoring of stage and velocities (4 - 6 m/s) on a stretch of Gregório stream, which crosses São Carlos city downtown, São Paulo, Brazil. The stream drains a densely populated and impervious area that only experiences appreciable water levels during rainfall events. For stage measurement, leveloggers were installed inside of pipes fixed on the wall of the channel and inside bottom brackets specially designed to minimize the effects of water velocities and interference on the flow conditions. The velocities measurements were performed using board Acoustic Doppler Profiler (ADP). It was necessary to adapt a support to the ADP in order to enable measurements on-site. The adaptations allowed the measurement of velocities via board ADP and added reliability to stage records, whose advantages and disadvantages are detailed in this work.