Columns | DATE | WTELEV | UCD (max. 3 columns) | |||
---|---|---|---|---|---|---|
Units | yyyy-mm-dd | m | user choice | |||
Values | eg. 2021-12-24 | -1000 to 8000 | user choice |
NAME | DESCRIPTION |
Index | Indicates the position of a specific record (line) in the timeseries. |
Change in WT Elev. (mm) | Change in Water Table (WT) Elevation. For daily timestep the values in this column are calculated as the difference between Water Table (WT) Elevations for two consecutive days (i.e. ΔWT Elev. = WT Elevt+1 - WT Elevt). For all other averaging intervals this is calculated as the difference between the last day and the first day in the interval (e.g., for monthly this is calculated as the difference between the water table elevation on the last day of the month and the water table elevation on the first day of the month). The units for ΔWT Elev. are mm. |
Groundwater Recharge (mm) | This is the amount of groundwater recharge and is always calculated using the daily timestep. When the data is displayed using averaging intervals other than daily, this is calculated as the sum of daily recharges (i.e., recharge is calculated only for the days when ΔWT Elev. is positive). The units for Groundwater Recharge are mm. To obtain the volume of recharge for a given area the user has to multiply this value with the land area of interest. |
Groundwater Discharge (mm) | This is the amount of groundwater discharge and is always calculated using the daily timestep. When the data is displayed using averaging intervals other than daily, this is calculated as the sum of daily discharges (i.e., discharge is calculated only for the days when ΔWT Elev. is negative). The units for Groundwater Discharge are mm. To obtain the volume of discharge for a given area the user has to multiply this value with the land area of interest. |
Change in aquifer storage (mm) | The change in aquifer storage is calculated on a daily basis as the product of ΔWT Elev. and specific yield. When positive, this indicates occurrence (i.e., dominance) of groundwater recharge, and when negative occurrence (i.e., dominance) of groundwater discharge. When the data is displayed using averaging intervals other than daily, this is calculated as the sum of daily changes, and thus, it shows the "net" change in storage over the respective averaging interval. The values calculated in this column are assigned to the Groundwater Recharge if positive and to Groundwater Discharge columns if negative. Consult sections 2 and 4 for additional details. |