ANALYSIS AND EVALUATION OF THE MEASUREMENT SYSTEM BASED ON KAMA ORIFICES FOR MEASURING THE FLOW OF SEWAGE IN THE LIGHT OF THE WATER LAW REQUIREMENTS

摘要

The new water law introduces the need to control the value of sewage discharge, if its average daily amount exceeds 0.01 m3·s-1. That is why there is a need to build a monitoring system for discharges from sewage treatment plants and large rainwater sewer outlets or storm overflows of a combined sewerage system. The article presents control measurements of measuring systems in which KAMA orifices were used in a circular collector and in a rectangular open channel as examples of the most common variants of drop point geometry. The obtained accuracy of measurement of the flow rate of KAMA orifices were related to other currently used techniques and measuring devices, indicating the most important reasons responsible for lower than one would expect accuracy in this range. The awareness of the equivalence of the used devices and measurement techniques in constant monitoring of the flow rate of discharged wastewater may be helpful in a rational construction of the control and measurement system.