diff --git a/requirements.txt b/requirements.txt
index de8cdc0..6e163f5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+numpy<1.24
 aequilibrae
 shapely>=2.0
 geopandas
diff --git a/tradesman/model.py b/tradesman/model.py
index fdca7e6..afb1bbc 100644
--- a/tradesman/model.py
+++ b/tradesman/model.py
@@ -113,6 +113,11 @@ def import_population(self, overwrite=False):
             *overwrite* (:obj:`bool`): Deletes pre-existing population_source_import. Defaults to False
         """
 
+        fields = self._project.zoning.fields
+        if "population" not in fields.all_fields():
+            fields.add("population", "Total population", "INTEGER")
+            fields.save()
+
         import_population(
             self._project, self._project.about.country_name, self.__population_source, overwrite=overwrite
         )
diff --git a/tradesman/model_creation/delete_links_and_nodes.py b/tradesman/model_creation/delete_links_and_nodes.py
index bc69472..42d9087 100644
--- a/tradesman/model_creation/delete_links_and_nodes.py
+++ b/tradesman/model_creation/delete_links_and_nodes.py
@@ -97,7 +97,7 @@ def delete_links_and_nodes(model_place, project: Project):
 
     del_links = list(links[~links.link_id.isin(inner_gdf.link_id)][["link_id"]].itertuples(index=False, name=None))
 
-    remove_triggers(project.conn, project.logger)
+    remove_triggers(project.conn, project.logger, "network")
 
     project.conn.executemany("DELETE FROM links WHERE link_id=?", del_links)
     project.conn.commit()
@@ -111,4 +111,4 @@ def delete_links_and_nodes(model_place, project: Project):
     project.conn.execute(nodes_query)
     project.conn.commit()
 
-    add_triggers(project.conn, project.logger)
+    add_triggers(project.conn, project.logger, "network")