Accurate water measurement plays an important role in efficient management of irrigation water both during conveyance and application in the field. A variety of flumes developed so far, have been successfully installed and used in unlined channels for discharge measurement to a desirable accuracy. These devices have however, offered many problems when attempted to install in the lined channels. The problems are distortion of watercourse cross section, borrowing of soil from adjoining fields, water pollution by sediments and consequent problems of watercourse maintenance emerging out of sediment inflow. The double-throated flume (DTF) is a recent innovation that offers opportunities of overcoming the above mentioned problems during installation and flow measurement in lined rectangular channels. The device has been tested for single throat width of2 to 10cm (4 to 20 cm for double throat), upstream head range of 28 to 60 cm and discharge range of 31 lps to 127 lps as calibrated against Cut-throat Flume measurements. The average correlation coefficient between the measured and the observed discharge ranges between 0.97 and 0.98 showing a high degree of predictability of the designed Double-throated flume.
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