'WHP_Flow.csv' contains well head pressure (psi), flowrate on the inlet side of the pumps before bypass, and downhole flow (gpm). The bypass line was necessary to allow the stimulation pumps to operate in the pressure and flow rate ranges for which they were designed. Times are recorded in PDT, and were changed to PST on 2012/11/4 at 02:00. This results in an hour of "overlapping" data. Downhole flow data has been corrected from 2012/10/23 10:30 to 2012/11/5 14:43 by a factor of 3 due to cold weather that affected the ultrasonic meter by causing the calibration settings to be lost and reset to the default settings. Pump inlet flow was measured with a high accuracy Rosemount orifice differential pressure meter with 991s size A3 sensors and signal output calibrated to 0-2500 gpm. Because 400-800 gpm was being bypassed into the sump, this value is generally not relevant to the stimulation itself. Downhole flow was measured with a Siemens ultrasonic flow meter with 24VDC loop powered transmitter calibrated to 0-1500 gpm. The ultrasonic meter was mounted on the high pressure pipeline between the stimulation pumps and the wellhead. By-pass flow, or the difference between the pump inlet flow and the downhole flow, was measured with a wier-box connected to an atmospheric seperator for calibration purposes but was not monitored continuously. Well head pressure was measured with a Rosemount pressure transmitter calibrated to 0-3000psi.