Parshall flume provides economical and flexible water measurement capabilities for a wide variety of open channel flow situations. The advantages of this structure include minimal head loss, low construction cost, adaptability to a variety of channel types and ability to measure wide ranges of flow with custom-designed structure. In this study, head measurements of a stream behind mass communication department, Nnamdi Azikiwe, University were taken using a fabricated 6-inch Parshall flume for five days. The flow rate of the stream was computed with a Parshall flume equation. The results achieved shows that the model has good ability to estimate flow rate passing through the fabricated Parshall. When compared with the free flow calibration table for Parshall flumes, the two results were in good agreement. Flow rates computed by the fabricated 0.1524m Parshall flume have a slight difference of 0.00002m3/s – 0.00018m3/s, with that of the free flow calibration. The average error in the estimation of flow rate between them was 0.0032 (0.32%) with a head loss of 0.0348m.