diff --git a/B04_wf1_Surface/B04_wf1_Surface_Engine.py b/B04_wf1_Surface/B04_wf1_Surface_Engine.py
index 9344bd77..9d97ca5f 100644
--- a/B04_wf1_Surface/B04_wf1_Surface_Engine.py
+++ b/B04_wf1_Surface/B04_wf1_Surface_Engine.py
@@ -283,6 +283,45 @@ def run_surface_analysis(
                 )
             except Exception as exc:
                 logger.warning("B04 국가 GIS 벡터 다운로드 실패: %s", exc)
+
+        # 3-3. 1:5,000 수치지형도 도엽 3x3(9매) 확보 → 프로젝트 영구저장소
+        # (실패해도 분석은 계속 — 폴백은 수동 다운로드 + 인제스트)
+        _report(92, "download_maps", "수치지형도 도엽 확보 중")
+        try:
+            from pyproj import Transformer
+
+            from B04_wf1_Surface.B04_wf1_Surface_Engine_MapSheet import (
+                latlon_to_sheet5k,
+                neighbors_3x3,
+            )
+            from B04_wf1_Surface.B04_wf1_Surface_Engine_SheetStore import (
+                ensure_sheets,
+                get_project_map_sheets_dir,
+            )
+            from B04_wf1_Surface.B04_wf1_Surface_Engine_VWorld import get_epsg_from_prj
+
+            src_epsg = "EPSG:5186"
+            if prj_path.exists():
+                src_epsg = get_epsg_from_prj(prj_path.read_text(encoding="utf-8", errors="ignore"))
+            transformer = Transformer.from_crs(src_epsg, "EPSG:4326", always_xy=True)
+            center_lon, center_lat = transformer.transform(
+                (bounds_dict_for_download["x"][0] + bounds_dict_for_download["x"][1]) / 2.0,
+                (bounds_dict_for_download["y"][0] + bounds_dict_for_download["y"][1]) / 2.0,
+            )
+            step_started = time.monotonic()
+            sheet_result = ensure_sheets(
+                get_project_map_sheets_dir(project_root),
+                neighbors_3x3(latlon_to_sheet5k(center_lat, center_lon)),
+            )
+            if sheet_result["failed"]:
+                logger.warning("B04 수치지형도 도엽 일부 확보 실패: %s", sheet_result["failed"])
+            logger.info(
+                "B04 수치지형도 도엽 확보 완료: %d매 (%.1fs)",
+                len(sheet_result["available"]),
+                time.monotonic() - step_started,
+            )
+        except Exception as exc:
+            logger.warning("B04 수치지형도 도엽 확보 실패: %s", exc)
     except Exception as exc:
         logger.warning("B04 지도·GIS 다운로드 단계 실패: %s", exc)