Métodos comparativos para determinação do volume de água de reservatório.

Abstract

Comparative methods for determining the volume of reservoir water. In order to quantify the water volume value of already constructed reservoirs or submerged surface modeling, conventional and automated techniques are used, using total station, engineering level or GNSS when the dam are dry. The objective of this study was to use the total station to determine the volume of the rural dam from the information of the elevation-area-volume curve and compare the results obtained with traditional methods and with the use of the GNSS RTK receiver. The study area corresponds to the hydraulic basin of the Preto dam, located in the experimental farm of the National Institute of the Semi - Arid, in the city of Campina Grande - PB. The research was carried out in two stages, the first one corresponded to the field survey and the second to the data processing in the laboratory. The traditional methodologies overestimated the volume of the Preto dam by 29,15% and 7,63% according to the equations proposed by Kieling (1991) and Molle (1994) respectively, based on the volume value of 191.685,39 m3 obtained by the total station. The survey carried out by the GNSS RTK receiver determines a volume of 191,973.51 m3 which differs by 288.12 m3 more than that found by the total station.