diff --git a/common_util/common_util_drainage_detail.py b/common_util/common_util_drainage_detail.py
index 33534c38..ceb52b29 100644
--- a/common_util/common_util_drainage_detail.py
+++ b/common_util/common_util_drainage_detail.py
@@ -55,11 +55,11 @@ from config.config_system import (
     DRAINAGE_DITCH_SAMPLE_M,
     DRAINAGE_FLOW_AREA_RATIO,
     DRAINAGE_MANNING_N,
-    DRAINAGE_RECOMMEND_DIAMETERS_MM,
     DRAINAGE_PIPE_MAX_SPACING_M,
     DRAINAGE_PIPE_MIN_SPACING_M,
     DRAINAGE_PIPE_SLOPE_DEG,
     DRAINAGE_RAINFALL_FILENAME,
+    DRAINAGE_RECOMMEND_DIAMETERS_MM,
     DRAINAGE_RUNOFF_COEFFICIENT,
     DRAINAGE_TC_MIN_MINUTES,
     DRAINAGE_VELOCITY_MAX_MS,