from imod.flow.pkgbase import Package
[docs]class StorageCoefficient(Package):
"""
Storage coefficient [-]. Be careful, this is not the same as the specific
storage.
From wikipedia (https://en.wikipedia.org/wiki/Specific_storage):
Storativity or the storage coefficient is the volume of water released
from storage per unit decline in hydraulic head in the aquifer, per
unit area of the aquifer. Storativity is a dimensionless quantity, and
is always greater than 0.
Under confined conditions:
S = Ss * b, where S is the storage coefficient,
Ss the specific storage, and b the aquifer thickness.
Under unconfined conditions:
S = Sy, where Sy is the specific yield
Parameters
----------
storage_coefficient : float or xr.DataArray
Storage coefficient, dims = ("layer", "y", "x").
"""
_pkg_id = "sto"
_variable_order = ["storage_coefficient"]
[docs] def __init__(self, storage_coefficient):
super().__init__()
self.dataset["storage_coefficient"] = storage_coefficient
[docs]class SpecificStorage(Package):
"""
Specific storage [L-1]. Be careful, this is not the same as the storage
coefficient.
From wikipedia (https://en.wikipedia.org/wiki/Specific_storage):
The specific storage is the amount of water that a portion of an aquifer
releases from storage, per unit mass or volume of aquifer, per unit change
in hydraulic head, while remaining fully saturated.
Parameters
----------
specific_storage : float or xr.DataArray
Specific storage, dims ``("layer", "y", "x")``.
"""
_pkg_id = "ssc"
_variable_order = ["specific_storage"]
[docs] def __init__(self, specific_storage):
super().__init__()
self.dataset["specific_storage"] = specific_storage