Groundwater depth measurements (often called bore hole monitoring) help in the management of the important groundwater resource on which we depend for many purposes. In particular groundwater resources may be used up through agriculture or mining operations.
Instruments can easily measure the amount of water that resides in our groundwater so we can manage the resource better. Measurements can deepen our understanding of the factors that influence groundwater recharge and lead to more effective water management.
Groundwater depth is measured with a small diameter sensor deep in an observation bore hole. Water depth can be measured with a pressure sensor lowered down the bore hole and immersed in the water. This is call hydrostatic depth method.
Alternatively a standard float-and-pulley sensor system with a small (50mm or 100mm) float and a pulley at the top of the bore hole can also be used to measure depth.
The hydrostatic depth method is widely used as it is convenient to install, however all pressure sensors have some drift which needs to be considered. The float and pulley method is less convenient, especially in narrow diameter bore holes of 100mm, however it is very accurate and is not subject to drift.
Unidata offers the 6542 Hydrostatic Water Depth and Temperature Probe which uses the hydrostatic pressure of water to measure water depths in various environments.
These systems are typically installed in existing bores, perhaps with a diameter of 100 to 200mm and a depth of 5 to 50 meters, with a bore head cap, often in a valve box / enclosure or some other form of bore head arrangement.
A data logger / RTU / NRL needs to be added at the top of the bore for data to be recorded and telemetered to a central location on a regular, perhaps 4 hourly basis.
There are generally two types of customers for these systems:
• A government authority which measures the groundwater levels for water table history generally.
• A mining or oil and gas company which has some mining or drilling activity in the area and has a need to ensure there is no change to the groundwater during their mining or drilling processes for compliance reasons.
The data collected can then be viewed, limits checked and alarms set in the event of a sudden change in the ground water level. The data can then be passed to a statistical groundwater analysis software package for groundwater modelling purposes.
Unidata offers the 3001M Borehole Logger that is designed for use in boreholes of 100mm internal diameter and above. It can be configured to use ether Cellular, LoRa, Iridium or Microsatellite networks as its method of sending sensor data from the field to the Neon Server. A wide range of sensor types are supported, for
example, analog sensors, frequency counters, digital inputs as well as Modbus and SDI-12. Sensors are connected to the logger via pluggable terminal blocks, SQL connector or a custom specified connector, allowing for easy removal of the logger if servicing is required.
|Options for Application Specific Instruments / Inputs||Unidata Part Number||Description|
|Borehole Neon Remote Logger||3001B-MC / L / I / H||Cellular, LoRa, Iridium or Microsatellite|
|Hydrostatic Water Depth Probe||6542D-A / B / C||PT12 Pressure / Temperature Sensor SDI-12 3.5m, 10m or 20m|
|Hydrostatic Water Depth Probe - Titanium||6542D-T-A / B / C||PT12 Pressure / Temperature Sensor SDI-12 3.5m, 10m or 20m|
|4-20mA Pressure Transmitter||6548A-B / C||Submersible Pressure Transmitter 4-20mA 5m or 10m|
|Options for Neon Telemetry - NRL / NRT / RTU / Field Units||Unidata Part Number||Description|
|Neon Remote Logger 16 Channels||3016A||Options Available: 3G/4G Cellular, Ethernet, Globalstar, Inmarsat, Iridium SBD and LoRa|
|Neon Remote Logger 8 Channels||3008A||Options Available: 3G/4G Cellular, Ethernet, Globalstar, Inmarsat, Iridium SBD and LoRa|
|Neon Remote Logger 4 Channels||3004A||Options Available: 3G/4G Cellular|
|Neon Remote Logger 4 Channels M Series||3004A-M||Options Available: 3G/4G Cellular, Ethernet, Microsatellite, Iridium SBD and LoRa|
|Cellular RTU 3G/4G||2013F-AB03 / 2013F-AB04||Neon Metering Module 3G/4G with Antenna and Li Battery|
|Cellular RTU 3G/4G - Industrial||2016F-AB03 / 2016F-AB04||Neon Remote Terminal 3G/4G with Antenna and Li Battery|
|Low Earth Orbit Satellite Globalstar||2015F-AB0||NRT Satellite Globalstar Modem with Antenna and three Li Batteries|
|Ethernet||2017F-0B0-1 or 3||NRT Ethernet with single or triple Ethernet Ports with three Li Batteries|
|Equatorial Orbit Satellite - Inmarsat||2018F-AB0-1 or 3||NRT Ethernet with single or triple Ethernet Ports with three Li Batteries|
|LCD Display||2500E||NRT LCD Display|
|NRT Field Termination Strip||2103F||2015F,2016F,2017F, and 2018F NRT FTS|
|NRT Firmware Option||2303A-8M||8M Extended Memory Option|
|NRT Firmware Option||2303A-8M-CAM||8M Extended Memory & Serial Camera Option|
|NRT Firmware Option||2303A-CAM||Serial Camera Option|
|Options for Neon Application Software - Customer Server||Unidata Part Number||Description|
|Neon Application Software||2302A||Neon Server Software Licence Incl 5 NAL |
|Neon Application Software||2302A-10||Additional 10 NRT Access Licences|
|Neon Application Software||2302A-20||Additional 20 NRT Access Licences|
|Neon Application Software||2302A-50||Additional 50 NRT Access Licences|
|Options for Neon Application Software - Unidata Server||Unidata Part Number||Description|
|Neon Application Software||2301A||Neon Data Initial Subscription Setup Fee|
|Neon Hosting Service||2301A-01||Neon Data Service Fee for 1-50 NRTs|
|Neon Hosting Service||2301A-02||Neon Data Service Fee for 51-100 NRTs|
|Neon Hosting Service||2301A-10||Neon Data Service Fee Metering|
|Options for Conventional Dataloggers / Field Units||Unidata Part Number||Description|
|Neon Remote Logger 16 Analog Channels / Touch Screen Display||3016A-000||16 Ch NRL (Superseded Prologger 7001D)|
|Neon Remote Logger 8 Analog Channels / Touch Screen Display||3008A-000||8 Ch NRL (Superseded Stalogger 6004D)|
|Neon Remote Logger 4 Analog Channels / Touch Screen Display||3004A-000||4 Ch NRL (Superseded Micrologger 8010C)|
|Starlog V4 Management Software||6308A-AUE||Starlog V4 Full Licence Key|