diff --git a/B06_Section/B06_Section_Server_Calc_Prebuild.py b/B06_Section/B06_Section_Server_Calc_Prebuild.py
index f14a3e08c..34ff50281 100644
--- a/B06_Section/B06_Section_Server_Calc_Prebuild.py
+++ b/B06_Section/B06_Section_Server_Calc_Prebuild.py
@@ -282,6 +282,8 @@ async def _recompute(project_id: UUID | str, route_id: int) -> int:
             {
                 "extra_walls": row["extra_walls"],
                 "wall_fill_overlap": row.get("wall_fill_overlap") or {},
+                # 실제로 선 유입 집수정 모양(I · L · U | None) — TS `ExtraWallRow.inlet_basin` 짝(98-2)
+                "inlet_basin": row.get("inlet_basin"),
             },
         )
         for row in output.get("extra_walls") or []
diff --git a/B06_Section/B06_Section_Structure_Layouts.ts b/B06_Section/B06_Section_Structure_Layouts.ts
index c22bbefc1..b647cdb67 100644
--- a/B06_Section/B06_Section_Structure_Layouts.ts
+++ b/B06_Section/B06_Section_Structure_Layouts.ts
@@ -16,7 +16,7 @@ import { withoutGuardedFill } from "./B06_Section_UI_Cross_Body_Guard";
 import { computeBoxLayout, DEFAULT_BOX_SIDE_ADJUST } from "./B06_Section_UI_Cross_Box_Geom";
 import { REVET_EMBED_DEPTH_M } from "./B06_Section_UI_Cross_Culvert_Const";
 import { DEFAULT_BASIN_ADJUST, ZERO_ADJUST } from "./B06_Section_UI_Cross_Culvert_Types";
-import type { WallAdjust, WallLayout } from "./B06_Section_UI_Cross_Culvert_Types";
+import type { BasinShape, WallAdjust, WallLayout } from "./B06_Section_UI_Cross_Culvert_Types";
 import {
   computeCardCulvert,
   culvertLinkFor,
@@ -265,6 +265,8 @@ export interface ExtraWallRow {
   chainage_m: number;
   extra_walls: BuiltExtraWall[];
   wall_fill_overlap: Record<string, number>;
+  /** 실제로 선 유입 집수정 모양(patch 형식 · 자동 지형 규칙 결과) · 안 섰으면 null — B08 관보호공(98-2). */
+  inlet_basin: BasinShape | null;
 }
 
 /**
@@ -315,7 +317,12 @@ export function extraWallRows(sections: readonly CrossSection[]): ExtraWallRow[]
         wall_fill_overlap[wall.role] = Number(wallBodyInFillM2(wall.points, areaInput).toFixed(3));
       }
     }
-    rows.push({ chainage_m: section.chainage_m, extra_walls: walls, wall_fill_overlap });
+    rows.push({
+      chainage_m: section.chainage_m,
+      extra_walls: walls,
+      wall_fill_overlap,
+      inlet_basin: culvert.basin?.shape ?? null,
+    });
   }
   return rows;
 }
diff --git a/resources/tester/test_b06_pipe_length.py b/resources/tester/test_b06_pipe_length.py
index b1fbefd21..f49d38916 100644
--- a/resources/tester/test_b06_pipe_length.py
+++ b/resources/tester/test_b06_pipe_length.py
@@ -101,7 +101,25 @@ def test_소유_측점에만_싣는다():
     layouts = _LAYOUTS.read_text(encoding="utf-8")
     assert "pipeOwnerChainage" in layouts, "소유 측점을 안 가리고 있다"
     assert "section.culvert?.chainage_m" in layouts, "관이 놓인 자리를 안 읽고 있다"
-    py = (PROJECT_ROOT / "B06_Section" / "B06_Section_Engine_Culvert.py").read_text(encoding="utf-8")
+    py = (PROJECT_ROOT / "B06_Section" / "B06_Section_Engine_Culvert.py").read_text(
+        encoding="utf-8"
+    )
     ts = (PROJECT_ROOT / "common_util" / "common_util_culvert_sets.ts").read_text(encoding="utf-8")
     assert '"chainage_m": pipe_chainage' in py
     assert "chainage_m: pipeChainage" in ts
+
+
+def test_집수정_실제_모양이_같은_길로_정본에_실린다():
+    """98-2 — 실제로 선 집수정 모양(patch · 자동 지형 규칙 결과)이 다단 벽과 같은 줄로 정본에 감.
+
+    TS 가 줄에 싣고(`ExtraWallRow.inlet_basin`) 서버가 합칠 때 받아야 함 — 한쪽만 있으면 조용히 버려짐.
+    """
+    layouts = _LAYOUTS.read_text(encoding="utf-8")
+    block = layouts[layouts.index("export interface ExtraWallRow") :]
+    assert "inlet_basin: BasinShape | null" in block[: block.index("}")]
+    assert "inlet_basin: culvert.basin?.shape ?? null" in layouts
+    prebuild = (PROJECT_ROOT / "B06_Section" / "B06_Section_Server_Calc_Prebuild.py").read_text(
+        encoding="utf-8"
+    )
+    merged = prebuild[prebuild.index("extra_walls = [") :][:900]
+    assert '"inlet_basin": row.get("inlet_basin")' in merged