DATA ANALYSIS
Does the HydroTechnics VECTOR system collect data in real time or continuously over longer periods of time? Once installed, the VECTOR collects data continuously for days, weeks, even years. It takes about a minute or so for the logging program to cycle through all of the probes channels making data recording next to real-time. This system allows the user to monitor both current ground water flow velocities and track any changes over time.
Can data be downloaded remotely? Most likely . Though not yet fully tested, todays aftyermarket RF modems make it possible to connect, upload and download data via short and long range radios. In addition RF?telephony modems also make it possible to connect via telephone lines.
How frequently must I download the collected data? Depending on the number of instruments operating in the system and how frequently data is averaged and stored, data can be stored easily for weeks, sometimes for months before downloading is necessary. However, a system of 10 probes collecting data every 5 minutes will require downloading every couple of days. Since available memory is a fixed number, data collection can be calculated and tailored beforehand to maximize memory capacity.
Does HTFlow calculate Darcy Flux or Pore Water Velocity? The HTFlow program calculates Darcy Flux or specific discharge. This number represents the velocity at which groundwater would move through an aquifer if the aquifer was like a giant pipe. Pore water velocity, otherwise known as seepage velocity, can be calculated if the effective porosity is known. That's why it's always a good idea to take split spoon samples as VECTORs are being installed; the data can then be incorporated into a ground water model.
What does VECTOR Data actually look like? Below are some screenshots of a relatively simple pump test that was conducted in the Waterloo Aquifer:
