New Current Flow Meter

I just received a new, fun toy: a current flow meter for stream work, sold by Forestry Suppliers. It's made in England with a nice booklet with helpful hints how to best describe stream flow. Basically, it's a propeller rotor mounted on a collapsible meter pole with a handheld meter that tells you fast it's rotating and you can convert that into flow rate. More expensive models (hundreds or thousands of dollars more) will tell you that information directly. It has attachments so that the rotor can be raised off the sediment to various heights (the default height is 10 cm). We'll use it at Estill Fork next Saturday in our first work-up of darter habitat micropartitioning. Today, I mow the lawn...