When you’re looking to take flow rate measurements, more often than not you’ll be using a weir or flume to get the job done. While they both offer accurate measurements, there are quite a few factors that can determine just how precise those measurements are. A stilling well is one of the best solutions for mitigating some conditions that might throw off those measurements. If you want to utilize a stilling well, however, you’ll need to consider the lag. Here’s how to account for stilling well lag.