update(ModflowWel): add basic support for mfnwt tabfile based well files (#2755)

* update(intersect): update days calculation to fix dropped precision
* replace timedelta.days with timedelta.total_seconds() / 86400

* linting

* update test_modeltime.py, remove note in hfb_util.py

* update(ModflowWel): add basic support for tabfile based well files

* Linting

* remove "flux" sfac_column for tabfile wel records

* update tabfile option check

* update aux variable check for tabfile type list records

* update option block check for tabfiles

Author: jlarsen-usgs

flopy/modflow/mfwel.py

@@ -163,6 +163,7 @@ def __init__(
         self.url = "wel.html"
         self.np = 0
 
+        tabfiles = False
         if options is None:
             options = []
         self.specify = False
@@ -178,6 +179,9 @@ def __init__(
             self.phiramp = self.options.phiramp
             self.iunitramp = self.options.iunitramp
             # this is to grab the aux variables...
+            if self.options.tabfiles:
+                tabfiles = True
+
             options = []
 
         else:
@@ -196,7 +200,9 @@ def __init__(
             self.dtype = self.get_default_dtype(structured=self.parent.structured)
 
         # determine if any aux variables in dtype
-        dt = self.get_default_dtype(structured=self.parent.structured)
+        dt = self.get_default_dtype(
+            structured=self.parent.structured, tabfiles=tabfiles
+        )
         if len(self.dtype.names) > len(dt.names):
             for name in self.dtype.names[len(dt.names) :]:
                 ladd = True
@@ -295,24 +301,38 @@ def add_record(self, kper, index, values):
             raise Exception(f"mfwel error adding record to list: {e!s}")
 
     @staticmethod
-    def get_default_dtype(structured=True):
-        if structured:
-            dtype = np.dtype(
-                [
-                    ("k", int),
-                    ("i", int),
-                    ("j", int),
-                    ("flux", np.float32),
-                ]
-            )
+    def get_default_dtype(structured=True, tabfiles=False):
+        if not tabfiles:
+            if structured:
+                dtype = np.dtype(
+                    [
+                        ("k", int),
+                        ("i", int),
+                        ("j", int),
+                        ("flux", np.float32),
+                    ]
+                )
+            else:
+                dtype = np.dtype([("node", int), ("flux", np.float32)])
         else:
-            dtype = np.dtype([("node", int), ("flux", np.float32)])
+            if structured:
+                dtype = np.dtype(
+                    [
+                        ("tabunit", int),
+                        ("tabval", int),
+                        ("k", int),
+                        ("i", int),
+                        ("j", int),
+                    ]
+                )
+            else:
+                dtype = np.dtype([("tabunit", int), ("tabval", int), ("node", int)])
         return dtype
 
     @staticmethod
-    def get_empty(ncells=0, aux_names=None, structured=True):
+    def get_empty(ncells=0, aux_names=None, structured=True, tabfiles=False):
         # get an empty recarray that corresponds to dtype
-        dtype = ModflowWel.get_default_dtype(structured=structured)
+        dtype = ModflowWel.get_default_dtype(structured=structured, tabfiles=tabfiles)
         if aux_names is not None:
             dtype = Package.add_to_dtype(dtype, aux_names, np.float32)
         return create_empty_recarray(ncells, dtype, default_value=-1.0e10)

flopy/pakbase.py

@@ -961,6 +961,8 @@ def load(
             nwt_options = OptionBlock.load_options(f, pak_type)
             line = f.readline()
 
+        nwt_tabfiles = False
+
         # check for parameters
         nppak = 0
         if "parameter" in line.lower():
@@ -1062,6 +1064,11 @@ def load(
                     options = nwt_options
                 else:
                     f.seek(ipos)
+
+                if isinstance(options, OptionBlock):
+                    if options.tabfiles:
+                        nwt_tabfiles = True
+
         elif "flopy.modflow.mfchd.modflowchd".lower() in pak_type_str:
             partype = ["shead", "ehead"]
 
@@ -1085,6 +1092,13 @@ def load(
         bnd_output_cln = None
         stress_period_data_cln = {}
         current_cln = None
+
+        if nwt_tabfiles:
+            # pass tabfile flag using the existing usg_args dict, change nper to 1
+            nper = 1
+            sfac_columns = []
+            usg_args["tabfiles"] = True
+
         for iper in range(nper):
             if model.verbose:
                 msg = f"   loading {pak_type} for kper {iper + 1:5d}"