The M1 Irrigation Channel is the primary water supply channel for the Ivanhoe Plain Irrigation Area within Kununurra which, along with the Packsaddle Irrigation Area, forms Stage 1 of the Ord River Irrigation Area (ORIA). Both Water Corporation and the Ord Irrigation Cooperative (OIC) monitor flow rates and levels throughout the irrigation area. This article aims to summarise and detail the historical complexities and challenges with regards to measurement within the channel.