Why is this code deleting rows within a feature class?

ccowin_odfw

Hello,

My organization has a couple administrative boundaries that are used for modeling and I'm trying to split them against each other and then figure out the percentage of state, federal, tribal and private land is for each of the subsections.

I wrote the following code it splits one feature by the other that contains ownership data. When I then go to process each output of the split it just completely deletes all the rows in some of the features and I have no idea why or how that can even happen.

import arcpy

gdb = <path redacted>
if arcpy.Exists(gdb):
    arcpy.Delete_management(gdb)

arcpy.management.CreateFileGDB(<path redacted>, 'DAU_by_Ownership.gdb')
all_wmus = <path redacted>
jurisdiction = <path redacted>
split = <path redacted>

arcpy.analysis.Split(jurisdiction, all_wmus, 'UNIT_NAME', gdb)

arcpy.env.workspace = gdb
WMUs = arcpy.ListFeatureClasses()


def get_acres(features, field):
    acres = 0
    with arcpy.da.SearchCursor(features, [field]) as cursor:
        for row in cursor:
            acres = row[0] + acres

return acres


for WMU in WMUs:
    # Calculate Area and Put that
    print('Getting area for ' + WMU)
    arcpy.management.CalculateGeometryAttributes(WMU, [['Acres', 'AREA_GEODESIC']], area_unit='ACRES_US')

    wmu_acres = get_acres(WMU, 'ACRES')
    print(f'...{wmu_acres} Acres')

    arcpy.management.AddField(WMU, 'WMU_Acres', 'LONG')
    arcpy.management.AddField(WMU, 'DAU_Acres', 'LONG')
    arcpy.management.AddField(WMU, 'WMU_pct', 'FLOAT')
    arcpy.management.AddField(WMU, 'DAU_pct', 'FLOAT')

    arcpy.management.CalculateField(WMU, 'UNIT_NAME', f'"{WMU}"')
    arcpy.management.CalculateField(WMU, 'WMU_Acres', f'{wmu_acres}')
    arcpy.management.CalculateField(WMU, 'WMU_pct', f'!Acres! / !WMU_Acres!')

rzufelt

That is weird.  In either case, it shouldn't have anything to do with deleting rows.

I'm at a loss on this one.

R_