Method of measuring stream discharge using radioisotope and current meter:a preliminary study of Sg. Benus, Pahang

This paper describes the methods of stream discharge measurements by radioisotope and current meter with regard to the low flow conditions of water flowing in a small stream. The theory, experimental approach and results as well as health and safety aspects and discharge comparison of both methods based on field observations are discussed. It is observed that the isotope tracer technique using Tc-99m has been proven to be satisfactory for gauging in good agreement and comparable to each other. It is proposed that a comprehensive stage discharge rating curve (δ H vs. Q) be established and measurement of dispersion coefficients of the flow will be carried out in the near future