From 9b3138cc1247eb826d4c0906ff93800ebd9a01d7 Mon Sep 17 00:00:00 2001
From: James Bruten <109733895+james-bruten-mo@users.noreply.github.com>
Date: Thu, 26 Feb 2026 09:18:20 +0000
Subject: [PATCH 1/3] remove river failure

---
 mule/lib/mule/validators.py | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mule/lib/mule/validators.py b/mule/lib/mule/validators.py
index 034382a2..4d253ce4 100644
--- a/mule/lib/mule/validators.py
+++ b/mule/lib/mule/validators.py
@@ -570,12 +570,9 @@ def validate_regular_field(umf, field):
             n_row_exp += 1
     elif field.stash.grid == 23:
         # River routing grid
-        if umf.fixed_length_header.horiz_grid_type != 0:
-            return ["Field is river routing diag, which is invalid "
-                    "for non-Global domains"]
-        else:
+        if umf.fixed_length_header.horiz_grid_type == 0:
             # Note the river routing diagnostics are restriced to a very
-            # specific fixed grid; any deviation from this is incorrect
+            # specific fixed global grid; any deviation from this is incorrect
             lon_start_exp = 0.5
             lat_start_exp = -89.5
             n_row_exp = 180

From 7bca4c9221178c809f41d6699c7cf5a3c9db686a Mon Sep 17 00:00:00 2001
From: James Bruten <109733895+james-bruten-mo@users.noreply.github.com>
Date: Wed, 15 Jul 2026 11:50:27 +0100
Subject: [PATCH 2/3] add comment

---
 mule/lib/mule/validators.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mule/lib/mule/validators.py b/mule/lib/mule/validators.py
index 4d253ce4..09523130 100644
--- a/mule/lib/mule/validators.py
+++ b/mule/lib/mule/validators.py
@@ -570,6 +570,7 @@ def validate_regular_field(umf, field):
             n_row_exp += 1
     elif field.stash.grid == 23:
         # River routing grid
+        # No validation is done for regional rivers
         if umf.fixed_length_header.horiz_grid_type == 0:
             # Note the river routing diagnostics are restriced to a very
             # specific fixed global grid; any deviation from this is incorrect

From 12ea441b48a42e456ee8fe683ac91d650723f4a3 Mon Sep 17 00:00:00 2001
From: James Bruten <109733895+james-bruten-mo@users.noreply.github.com>
Date: Fri, 17 Jul 2026 11:41:10 +0100
Subject: [PATCH 3/3] Update mule/lib/mule/validators.py

Co-authored-by: Sam Clarke-Green <74185251+t00sa@users.noreply.github.com>
---
 mule/lib/mule/validators.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mule/lib/mule/validators.py b/mule/lib/mule/validators.py
index 09523130..67dea05a 100644
--- a/mule/lib/mule/validators.py
+++ b/mule/lib/mule/validators.py
@@ -572,7 +572,7 @@ def validate_regular_field(umf, field):
         # River routing grid
         # No validation is done for regional rivers
         if umf.fixed_length_header.horiz_grid_type == 0:
-            # Note the river routing diagnostics are restriced to a very
+            # Note the river routing diagnostics are restricted to a very
             # specific fixed global grid; any deviation from this is incorrect
             lon_start_exp = 0.5
             lat_start_exp = -89.5