ECV Products and Requirements for Groundwater
These products and requirements reflect the Implementation Plan 2016 (GCOS-200). GCOS is reviewing and will update the requirements until 2022. More information on: gcos.wmo.int.
| PRODUCT | DEFINITION | FREQUENCY | RESOLUTION | REQUIRED MEASUREMENT UNCERTAINTY | STABILITY | STANDARDS/ REFERENCES | |
| Groundwater storage change | The volumetric loss or gain of groundwater between two time periods | Monthly | 100 km | 10 cm | TBD | ||
| Groundwater level | The level of water table, the upper surface of the saturated portion of the soil or bedrock | Weekly | Per well | 1 cm | ISO 21413:2005 | ||
| Groundwater recharge | Natural process where permeable soil or rock allow water to readily seep into the aquifer | Weekly | Per well | 10 % (relative) | |||
| Groundwater discharge | Process in which groundwater leaves the aquifer at discharge zones | Weekly | Per well | 10 % (relative) | |||
| Wellhead level | Elevation of a well | Weekly | Per well | 1 cm | |||
| Groundwater quality | Chemical, physical and biological characteristics of groundwater that are relevant to the services that it provides | Weekly | Per well | tbd | ISO/TC 147; ISO 5667-18:2001 part 18 | ||
