This file contains definitions for HYPE's regional aquifer module, see code deepground (option 2) in the model options of info.txt and the corresponding process description in the aquifer section of the HYPE model description. Regional aquifers are linear reservoirs which connected to a group of sub-basins. These can add water, with IN and SP fluxes, to the aquifer through percolation from the deepest soil layer, and receive return flow into their main river volume. AquiferData.txt contains connection properties for sub-basins contributing to regional aquifers and generic properties for the aquifers themselves.

AquiferData.txt is a tab-separated file located in the modeldir folder. Sub-basins are listed row-wise. The first row contains a column header with variable names. Variable names are not case-sensitive (max. 10 characters, no spaces). Columns with headings unknown to HYPE are skipped while reading the file, but must not longer than ten characters. Columns containing character strings, e.g. descriptive meta-data, must not exceed a length of 100 characters. The columns may be in any order. A value must exist for every column and row, i.e. empty cells are not allowed. This means that in the current form, zeros have to be filled in for all aquifer-related variables in sub-basin rows and vice-versa.

Example for an AquiferData.txt file with two aquifers and each two contributing sub-basins (no water quality parameters):

NAME AREA SUBID POROSITY BASEDEPTH TOPDEPTH INIDEPTH RECHARGE AQUID RETFRAC RETRATE DELAY PARREG
none 1500     1        0         0        0        0        1     1       0       0     0      0
none 2000     2        0         0        0        0        1     1       1       0     0      0
Aqu1 3500     0     0.15       -55       -5       -7        0     1       0 3.5E-08    10      1
none 4000     3        0         0        0        0        1     2     0.3       0     0      0
none 3200     4        0         0        0        0        1     2     0.7       0     0      0
Aqu2 7200     0     0.09       -20       -2       -4        0     2       0 1.5E-05     4      2

All AquiferData.txt variables are described in the table below.