NetMap's Watershed Assessment
Watershed Attribute: Stream power is a measure of the energy of a stream channel including that which is related to the ability to transport sediment, including bedload and suspended load.
Data Types: Line (stream layer)
Field Name: STRMPOW
Units: watts/m
NetMap Level 1 Module/Tool:Fluvial Processes/Network Variables
Model Description: Stream power is calculated as: ρgQs where ρ is density of water (1000 kg/m3), g is acceleration due to gravity (9.8 m/s2), Q is discharge (m3/s) and S is channel slope. Q is calculated as WdV where W is bankfull channel width (m), d is bankfull channel depth, and v is velocity (m/s). See also this.