Flat bottom evaporating basins

This specification outlines the technical requirements and testing procedures for flat-bottom evaporation pans, essential instruments for measuring evaporation rates in meteorological and hydrological studies. The design details the dimensions, materials, and construction tolerances to ensure uniformity across different manufacturing sources and measurement environments. It defines the geometric specifications of the pan, including the circular rim and the depth, which are critical for achieving consistent water surface exposure and minimizing wind effects during data collection. The document also addresses the calibration methods and the necessary materials that must be used to prevent corrosion and maintain structural integrity under prolonged outdoor exposure. Adherence to these specifications allows for accurate comparison of evaporation data across various geographical locations and time periods. By standardizing the physical attributes and performance criteria of these instruments, the guideline supports the reliability of climate monitoring and water resource management practices globally without altering the fundamental design of the apparatus itself.