diff --git a/B03_FileInput/B03_FileInput_Router.py b/B03_FileInput/B03_FileInput_Router.py
index 2867abd5..e573962f 100644
--- a/B03_FileInput/B03_FileInput_Router.py
+++ b/B03_FileInput/B03_FileInput_Router.py
@@ -23,14 +23,76 @@ from B03_FileInput.B03_FileInput_Repository import (
     list_incomplete_upload_sessions,
     list_project_input_files,
 )
+
+# 분리 전 이 파일에 있던 이름은 그대로 다시 내보낸다 — 옛 이름을 참조하는
+# 테스트·스크립트가 깨지지 않게 하기 위함이다(2026-09-04).
+from B03_FileInput.B03_FileInput_Router_Chunks import (
+    create_project_upload_session as create_project_upload_session,
+)
+from B03_FileInput.B03_FileInput_Router_Chunks import (
+    finalize_project_upload as finalize_project_upload,
+)
+from B03_FileInput.B03_FileInput_Router_Chunks import (
+    get_project_upload_status as get_project_upload_status,
+)
 from B03_FileInput.B03_FileInput_Router_Chunks import router as chunk_router
+from B03_FileInput.B03_FileInput_Router_Chunks import (
+    upload_project_chunk as upload_project_chunk,
+)
 from B03_FileInput.B03_FileInput_Router_Errors import lookup_error_response
 from B03_FileInput.B03_FileInput_Router_Helpers import (
-    _REQUIRED_FILE_TYPES,
-    _complete_file_input_if_ready,
-    _missing_required_file_types,
-    _schedule_background_task,
-    _write_stage_metadata,
+    _ANALYSIS_RUNNING_MESSAGE as _ANALYSIS_RUNNING_MESSAGE,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _BACKGROUND_TASKS as _BACKGROUND_TASKS,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _POINT_CLOUD_FILE_TYPES as _POINT_CLOUD_FILE_TYPES,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _REQUIRED_FILE_TYPES as _REQUIRED_FILE_TYPES,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _ROUTE_FILE_TYPES as _ROUTE_FILE_TYPES,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _SHAPEFILE_REQUIRED_TYPES as _SHAPEFILE_REQUIRED_TYPES,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _already_uploaded as _already_uploaded,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _complete_file_input_if_ready as _complete_file_input_if_ready,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _get_project_notification_info as _get_project_notification_info,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _is_point_cloud_result as _is_point_cloud_result,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _missing_required_file_types as _missing_required_file_types,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _require_complete_file_set as _require_complete_file_set,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _schedule_background_task as _schedule_background_task,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _send_upload_complete_notification as _send_upload_complete_notification,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _stored_fingerprint as _stored_fingerprint,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _total_chunks as _total_chunks,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _update_project_status as _update_project_status,
+)
+from B03_FileInput.B03_FileInput_Router_Helpers import (
+    _write_stage_metadata as _write_stage_metadata,
 )
 from B03_FileInput.B03_FileInput_Schema import (
     FileUploadDescriptor,
diff --git a/B03_FileInput/B03_FileInput_Router_Temp.py b/B03_FileInput/B03_FileInput_Router_Temp.py
index 3304a0fe..e962669b 100644
--- a/B03_FileInput/B03_FileInput_Router_Temp.py
+++ b/B03_FileInput/B03_FileInput_Router_Temp.py
@@ -40,12 +40,35 @@ from B03_FileInput.B03_FileInput_Repository_Temp import (
     upsert_temp_batch_file,
 )
 from B03_FileInput.B03_FileInput_Router_Errors import lookup_error_response
+
+# 분리 전 이 파일에 있던 이름은 그대로 다시 내보낸다(2026-09-04).
+from B03_FileInput.B03_FileInput_Router_Temp_Chunks import (
+    create_batch_upload_session as create_batch_upload_session,
+)
+from B03_FileInput.B03_FileInput_Router_Temp_Chunks import (
+    finalize_batch_upload as finalize_batch_upload,
+)
+from B03_FileInput.B03_FileInput_Router_Temp_Chunks import (
+    get_batch_upload_status as get_batch_upload_status,
+)
 from B03_FileInput.B03_FileInput_Router_Temp_Chunks import router as chunk_router
+from B03_FileInput.B03_FileInput_Router_Temp_Chunks import (
+    upload_batch_chunk as upload_batch_chunk,
+)
 from B03_FileInput.B03_FileInput_Router_Temp_Support import (
-    _POINT_CLOUD_FILE_TYPES,
-    _batch_root,
-    _iso,
-    _refresh_batch_status,
+    _POINT_CLOUD_FILE_TYPES as _POINT_CLOUD_FILE_TYPES,
+)
+from B03_FileInput.B03_FileInput_Router_Temp_Support import (
+    _batch_root as _batch_root,
+)
+from B03_FileInput.B03_FileInput_Router_Temp_Support import (
+    _iso as _iso,
+)
+from B03_FileInput.B03_FileInput_Router_Temp_Support import (
+    _refresh_batch_status as _refresh_batch_status,
+)
+from B03_FileInput.B03_FileInput_Router_Temp_Support import (
+    _total_chunks as _total_chunks,
 )
 from B03_FileInput.B03_FileInput_Schema import (
     FileUploadDescriptor,
diff --git a/B07_DesignDetail/B07_DesignDetail_Router_Support.py b/B07_DesignDetail/B07_DesignDetail_Router_Support.py
index f3b1972f..0381742e 100644
--- a/B07_DesignDetail/B07_DesignDetail_Router_Support.py
+++ b/B07_DesignDetail/B07_DesignDetail_Router_Support.py
@@ -36,6 +36,9 @@ from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Table import (
     QUANTITY_VALUE_KEYS,
 )
 from B07_DesignDetail.B07_DesignDetail_Engine_Template import add_title_fields
+from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
+    _BASIN_MAX_DISTANCE_M as _BASIN_MAX_DISTANCE_M,
+)
 
 # 유역도 배경·파일 입출력 조각은 700줄 제한으로 떼어냈다(2026-09-04).
 # 여기서 그대로 다시 내보내 호출부(`B07_DesignDetail_Router.py`)의 import 경로는 불변이다.
@@ -48,12 +51,18 @@ from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
 from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
     _basins_crs as _basins_crs,
 )
+from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
+    _clip_segment as _clip_segment,
+)
 from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
     _geojson_features as _geojson_features,
 )
 from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
     _geojson_payload as _geojson_payload,
 )
+from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
+    _geometry_lines as _geometry_lines,
+)
 from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
     _too_far_from_route as _too_far_from_route,
 )
diff --git a/config/config_system.py b/config/config_system.py
index 6757cffd..50a826ca 100644
--- a/config/config_system.py
+++ b/config/config_system.py
@@ -111,6 +111,7 @@ AUTO_DESIGN_CHAIN_ENABLED = os.getenv("AUTO_DESIGN_CHAIN_ENABLED", "True").lower
 # 5장(지형·설계 파라미터)은 파일이 700줄을 넘어 떼어냈다(2026-09-04).
 # 여기서 그대로 다시 내보내므로 `from config.config_system import …` 호출부는 불변이다.
 from config.config_system_design import *  # noqa: E402,F401,F403
+from config.config_system_design import _SCS_SOIL as _SCS_SOIL  # noqa: E402
 from config.config_system_terrain import *  # noqa: E402,F401,F403
 
 # ─────────────────────────────────────────────────────────────────────────