From 209383ed1784f8a0fc1c11fee7d99260ba8b08d9 Mon Sep 17 00:00:00 2001
From: umsangdon <umsangdon@gmail.com>
Date: Mon, 12 Oct 2026 21:58:16 +0900
Subject: [PATCH] =?UTF-8?q?feat(b05,b06,b07):=20=EB=8F=84=EC=88=98?=
 =?UTF-8?q?=EB=A1=9C/=EB=8F=8C=EB=B6=99=EC=9E=84=20=EB=9D=A0=20=3D=20?=
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 =?UTF-8?q?=EC=B9=99=EA=B3=BC=20=EA=B8=B8=EC=9D=B4=20=EC=B9=B8=20(294-4)?=
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- 공용 chuteRun(Wall_Hatch) — 길이 비움 = 원지반 닿으면 끝 · 넣음 = 사면 따라 그 길이 · 사면보다 길면 원지반 따라 이어 그 길이 · 끝단이 이미 원지반이면 안 그림
- 물넘이 — 띠 시작 = 늘인 노면 끝(294-3) · 아니면 유출 쪽 노견 끝 · 원지반 닿으면 끝(양측 절토 = 띠 없음)
- 배관 · 박스 · 세월교 — 띠 계산이 원지반(layout.ground)을 받아 같은 규칙 · 3D 띠도 같음 · 코리도 해시에 길이
- 명세 CHUTE_ITEMS 맨 아래 「길이 (m)」(chute_add_{n}_length_m · 그림 전용) · 물넘이는 공용 칸 그대로
- 면적 자동 = 물넘이 · 세월교만 월류 폭 × 길이(배관 · 박스 = 폭 정의 없어 손 입력 그대로 · 브레인 정함)
- 길이는 집계 열 · B08 수량(면적만)에 안 실림 · 마스터 정의 이름 표는 안 건드림(이름 표 대조 시험에서 이 칸만 밖)
- 시험 test_294_3 · 286_1 · 52 · 65 · 152_3 기대값

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TteK8mfYZetk5P3bEZkyVZ
---
 .../design/design_structure_ford_calc.ts      | 19 ++--
 .../design/design_structure_ford_pavement.ts  |  4 +-
 A00_Common/design/design_structure_guard.ts   |  2 +
 .../B05_Profile_UI_Corridor_Structures.ts     |  9 +-
 .../B05_Profile_UI_Corridor_Structures_Box.ts |  2 +
 ...05_Profile_UI_Corridor_Structures_Chute.ts | 21 ++++-
 ...B05_Profile_UI_Corridor_Structures_Hash.ts |  5 +-
 .../B05_Profile_UI_Drainage_Facility.ts       |  5 +-
 B06_Section/B06_Section_UI_Cross_Box.ts       |  1 +
 B06_Section/B06_Section_UI_Cross_Box_Geom.ts  |  4 +
 B06_Section/B06_Section_UI_Cross_Culvert.ts   |  1 +
 .../B06_Section_UI_Cross_Culvert_Geom.ts      |  2 +
 .../B06_Section_UI_Cross_Culvert_Types.ts     |  2 +
 B06_Section/B06_Section_UI_Cross_Ford.ts      |  1 +
 B06_Section/B06_Section_UI_Cross_Ford_Geom.ts |  4 +
 .../B06_Section_UI_Cross_Ford_Pavement.ts     | 76 ++++++++++------
 B06_Section/B06_Section_UI_Cross_View.ts      |  3 +-
 .../B06_Section_UI_Cross_Wall_Hatch.ts        | 81 ++++++++++++++++-
 .../B07_DesignDetail_Cross_Overlay.ts         |  4 +-
 .../tester/helper_286_1_ford_pavement.cjs     |  5 +-
 .../tester/helper_294_3_ford_extend_chute.cjs | 32 +++++++
 resources/tester/test_152_3_chute_cut.py      |  5 +-
 .../tester/test_286_1_ford_pavement_design.py |  3 +-
 .../tester/test_294_3_ford_extend_chute.py    | 91 ++++++++++++++++++-
 .../tester/test_52_4_structure_spec_ford.py   |  5 +-
 .../tester/test_52_structure_spec_box.py      |  3 +-
 .../tester/test_52_structure_spec_pipe.py     |  3 +-
 resources/tester/test_65_ford_defaults.py     |  1 +
 28 files changed, 331 insertions(+), 63 deletions(-)

diff --git a/A00_Common/design/design_structure_ford_calc.ts b/A00_Common/design/design_structure_ford_calc.ts
index 1f7fee6bb..474f37a92 100644
--- a/A00_Common/design/design_structure_ford_calc.ts
+++ b/A00_Common/design/design_structure_ford_calc.ts
@@ -88,28 +88,31 @@ export function chuteAreaM2(widthM: number, lengthM: number): number {
 }
 
 /**
- * 물넘이 포장 도수로/돌붙임 길이 ↔ 면적(287-1) — 길이를 넣으면 면적 = 폭 × 길이(폭 = 띠가 도로 방향으로
- * 걸치는 월류 폭 · 비면 물넘이 기본 폭) · 길이를 비우면 면적 = 칸 기본값 · 월류 폭을 바꾸면 길이가 있을 때만
+ * 물넘이 포장 · 세월교 도수로/돌붙임 길이 ↔ 면적(287-1 · 294-4) — 길이를 넣으면 면적 = 폭 × 길이(폭 = 띠가
+ * 도로 방향으로 걸치는 월류 폭 · 비면 물넘이 기본 폭 · 배관 · 박스는 폭 정의 없어 자동 안 함) · 길이를 비우면 면적 = 칸 기본값 · 월류 폭을 바꾸면 길이가 있을 때만
  * 다시 셈. 길이는 그림(사면 따라 그 길이) · 면적은 수량(B08 돌붙임)이 씀.
  */
 export function syncChuteArea(
   form: Pick<SpecForm, "state" | "setValue">,
   c: SpecContainer,
   item: SpecItem,
+  /** 도수로 상자 · 월류 폭 상자 — 물넘이 `chute` · `slope` · 세월교 `chute_add` · `ford`(294-4). */
+  chuteBox = "chute",
+  widthBox = "slope",
 ): void {
-  const byLength = c.id === "chute" && item.id === "length_m";
-  if (!byLength && !(c.id === "slope" && item.id === "width")) return;
-  const chute = form.state().chute?.[0];
+  const byLength = c.id === chuteBox && item.id === "length_m";
+  if (!byLength && !(c.id === widthBox && item.id === "width")) return;
+  const chute = form.state()[chuteBox]?.[0];
   if (!chute) return;
   const length = Number(chute.length_m ?? "");
   if (!(chute.length_m ?? "").trim() || !(length > 0)) {
     if (byLength)
-      form.setValue("chute", "area", CHUTE_ITEMS.find((i) => i.id === "area")?.default ?? "");
+      form.setValue(chuteBox, "area", CHUTE_ITEMS.find((i) => i.id === "area")?.default ?? "");
     return;
   }
-  const width = Number(form.state().slope?.[0]?.width ?? "");
+  const width = Number(form.state()[widthBox]?.[0]?.width ?? "");
   form.setValue(
-    "chute",
+    chuteBox,
     "area",
     String(chuteAreaM2(width > 0 ? width : FORD_PAVEMENT_DEFAULT_WIDTH_M, length)),
   );
diff --git a/A00_Common/design/design_structure_ford_pavement.ts b/A00_Common/design/design_structure_ford_pavement.ts
index 8db636fa2..2f0f602f1 100644
--- a/A00_Common/design/design_structure_ford_pavement.ts
+++ b/A00_Common/design/design_structure_ford_pavement.ts
@@ -35,8 +35,8 @@ export const FORD_PAVEMENT_SPEC: StructureSpec = {
       prefix: "ford_chute",
       link: "gfordpavechute",
       max: 1,
-      // 배관 · 박스 · 세월교와 같은 칸(구조 · 형태 · 두께 · 면적 · 90-2) + 맨 아래 길이(그림 전용 · 286-3)
-      items: [...CHUTE_ITEMS, { id: "length_m", label: "길이 (m)", kind: "number", step: 0.1 }],
+      // 배관 · 박스 · 세월교와 같은 칸(구조 · 형태 · 두께 · 면적 · 맨 아래 길이 — 그림 전용 · 286-3 · 294-4)
+      items: CHUTE_ITEMS,
     },
   ],
   // 표 03 에 없는 옛 칸 — 화면에서 빼고 값은 남김(지난 정의 값)
diff --git a/A00_Common/design/design_structure_guard.ts b/A00_Common/design/design_structure_guard.ts
index c5d18b956..818acb556 100644
--- a/A00_Common/design/design_structure_guard.ts
+++ b/A00_Common/design/design_structure_guard.ts
@@ -144,6 +144,8 @@ export const CHUTE_ITEMS: SpecItem[] = [
   },
   { id: "thickness", label: "두께 (cm)", kind: "number", step: 1, default: "45" },
   { id: "area", label: "면적 (㎡)", kind: "number", step: 0.1, default: "30" },
+  // 길이(294-4 · `{접두}_{n}_length_m`) — 띠를 사면 따라 그릴 길이 · 그림 전용(수량 · 내역 · 일위대가에 안 씀)
+  { id: "length_m", label: "길이 (m)", kind: "number", step: 0.1 },
 ];
 
 /** 도수로/돌붙임(선택 · 하나만 · 54-48) — 옛 둘 이상은 보이되 [추가]만 숨김. */
diff --git a/B05_Profile/B05_Profile_UI_Corridor_Structures.ts b/B05_Profile/B05_Profile_UI_Corridor_Structures.ts
index c39573839..2a6b0c3fc 100644
--- a/B05_Profile/B05_Profile_UI_Corridor_Structures.ts
+++ b/B05_Profile/B05_Profile_UI_Corridor_Structures.ts
@@ -487,6 +487,8 @@ export function buildCorridorStructures(
       chuteBands(
         fordLayout.sides.filter((side) => side.role === "outlet").flatMap((s) => s.fillSegments),
         section.ford?.chute,
+        undefined,
+        fordLayout.ground,
       ).forEach((band) => pushSwept("chute", band, half, half, null, "chute"));
       // 날개벽 4매 — BOX암거와 같은 규칙(2026-08-25 사용자). 뿌리는 **벽 외측면**
       // (성토 경사측면과 마주치는 면) 모서리다(2026-08-25 ⑤ — 종전 바닥판 바깥 끝은
@@ -595,7 +597,12 @@ export function buildCorridorStructures(
         );
     }
     // 도수로 · 돌붙임 띠 — 유출 성토 조각(단 사이 포함) · 묻힌 끝 3도 절토 조각(152-3) · 유출 벽 길이(135-3).
-    chuteBands(layout.outletFill.segments, section.culvert?.chute, isChuteSegment).forEach((band) =>
+    chuteBands(
+      layout.outletFill.segments,
+      section.culvert?.chute,
+      isChuteSegment,
+      layout.ground,
+    ).forEach((band) =>
       pushSwept("chute", band, outletSpan.beforeM, outletSpan.afterM, null, "chute"),
     );
     // 다단은 **단별 구간값**을 따른다(2026-08-29 사용자 — 단마다 연장이 다르다).
diff --git a/B05_Profile/B05_Profile_UI_Corridor_Structures_Box.ts b/B05_Profile/B05_Profile_UI_Corridor_Structures_Box.ts
index 65f01341d..01a49e1aa 100644
--- a/B05_Profile/B05_Profile_UI_Corridor_Structures_Box.ts
+++ b/B05_Profile/B05_Profile_UI_Corridor_Structures_Box.ts
@@ -182,6 +182,8 @@ export function boxSolids(
   const chutes: CorridorStructure[] = chuteBands(
     layout.sides.filter((side) => side.wingRole === "outlet").flatMap((side) => side.fillSegments),
     box.chute,
+    undefined,
+    layout.ground,
   ).map((band) => ({
     chainage_m: chainage,
     kind: "chute",
diff --git a/B05_Profile/B05_Profile_UI_Corridor_Structures_Chute.ts b/B05_Profile/B05_Profile_UI_Corridor_Structures_Chute.ts
index 1cbe71281..cedbba41f 100644
--- a/B05_Profile/B05_Profile_UI_Corridor_Structures_Chute.ts
+++ b/B05_Profile/B05_Profile_UI_Corridor_Structures_Chute.ts
@@ -10,8 +10,12 @@
 
 import type { ChuteSpec, CrossSection } from "../B06_Section/B06_Section_Api_Fetch";
 import type { OffsetPoint } from "../B06_Section/B06_Section_UI_Cross_Culvert_Types";
-import { chuteBandOutline } from "../B06_Section/B06_Section_UI_Cross_Wall_Hatch";
-import { fordChuteLine } from "../B06_Section/B06_Section_UI_Cross_Ford_Pavement";
+import {
+  chuteBandOutline,
+  chuteRun,
+  groundLine,
+} from "../B06_Section/B06_Section_UI_Cross_Wall_Hatch";
+import { outletFillLine } from "../B06_Section/B06_Section_UI_Cross_Ford_Pavement";
 
 /** 성토 조각 하나 — B06 오버레이가 띠를 그리는 선(절토 조각은 뺀다). */
 interface FillSegment {
@@ -25,10 +29,11 @@ export function chuteBands(
   segments: ReadonlyArray<FillSegment>,
   chute: ChuteSpec | null | undefined,
   keep: (segment: FillSegment) => boolean = (segment) => segment.kind !== "cut",
+  /** 원지반 — 길이가 사면보다 길면 이어 그림(294-4 · 횡단 띠와 같은 `chuteRun`). */
+  ground?: readonly OffsetPoint[],
 ): OffsetPoint[][] {
   if (!chute) return [];
-  return segments.flatMap((segment) => {
-    if (!keep(segment)) return [];
+  return chuteRun(segments.filter(keep), chute.length_m, ground).flatMap((segment) => {
     const band = chuteBandOutline(segment.points, chute.thickness_m);
     return band ? [band.outline] : [];
   });
@@ -51,6 +56,12 @@ export function fordPavementChute(
     );
     if (owner !== section) return null;
   }
-  const bands = chuteBands([{ points: fordChuteLine(section.design, pave.chute) }], pave.chute);
+  const ground = groundLine(section.samples ?? []);
+  const bands = chuteBands(
+    [{ points: outletFillLine(section.design, ground) }],
+    pave.chute,
+    undefined,
+    ground,
+  );
   return bands.length ? { bands, halfM: Math.max(pave.span_m, 0.5) / 2 } : null;
 }
diff --git a/B05_Profile/B05_Profile_UI_Corridor_Structures_Hash.ts b/B05_Profile/B05_Profile_UI_Corridor_Structures_Hash.ts
index bd4e7aa1d..6cbfcd72f 100644
--- a/B05_Profile/B05_Profile_UI_Corridor_Structures_Hash.ts
+++ b/B05_Profile/B05_Profile_UI_Corridor_Structures_Hash.ts
@@ -16,7 +16,10 @@ import type {
 
 /** 도수로 · 돌붙임 띠(135-3) — 고른 때만 붙인다(안 고른 측점은 해시 그대로 · 저장본 안 만료). */
 function chuteParts(chute: ChuteSpec | null | undefined): Array<string | number> {
-  return chute ? ["ch", chute.structure, chute.thickness_m] : [];
+  if (!chute) return [];
+  // 길이(294-4)는 넣은 때만 — 옛 저장본 해시 그대로
+  const base = ["ch", chute.structure, chute.thickness_m];
+  return chute.length_m ? [...base, chute.length_m] : base;
 }
 
 /** 해시 입력용 요약 — 구조물에 영향을 주는 값만 짧게 이어 붙인다(Corridor.ts가 쓴다). */
diff --git a/B05_Profile/B05_Profile_UI_Drainage_Facility.ts b/B05_Profile/B05_Profile_UI_Drainage_Facility.ts
index 18825e7b9..a9a65e47b 100644
--- a/B05_Profile/B05_Profile_UI_Drainage_Facility.ts
+++ b/B05_Profile/B05_Profile_UI_Drainage_Facility.ts
@@ -384,7 +384,10 @@ export function createFacilityOptionsForm(
   );
   // 유출 흙막이 단 수 = 흙막이 상자 수(관보호공과 같은 방향 · 「+ 흙막이」 없음 · 90-1)
   const fordForm: SpecForm = createSpecForm(specLinks, {
-    onChange: fordFlowBox.onChange,
+    onChange: (c, item) => (
+      syncChuteArea(fordForm, c, item, "chute_add", "ford"),
+      fordFlowBox.onChange(c, item)
+    ),
     fields: (c, values) => [...guardFields(c, values), ...fordFlowBox.fields(c)],
     count: guardSoilCount(
       () => chainage,
diff --git a/B06_Section/B06_Section_UI_Cross_Box.ts b/B06_Section/B06_Section_UI_Cross_Box.ts
index d9e4ff93a..e044cebbb 100644
--- a/B06_Section/B06_Section_UI_Cross_Box.ts
+++ b/B06_Section/B06_Section_UI_Cross_Box.ts
@@ -166,6 +166,7 @@ export function appendBoxOverlay(
       box.chute,
       x,
       toDisplayY,
+      layout.ground,
     );
   // ⑥ 끝 바깥 절 · 성토선 — 세월교 측벽과 같은 체계(79-7). 흙막이 쪽은 기하가 걷어 둠.
   for (const side of layout.sides) {
diff --git a/B06_Section/B06_Section_UI_Cross_Box_Geom.ts b/B06_Section/B06_Section_UI_Cross_Box_Geom.ts
index fecab8916..c7014e1b5 100644
--- a/B06_Section/B06_Section_UI_Cross_Box_Geom.ts
+++ b/B06_Section/B06_Section_UI_Cross_Box_Geom.ts
@@ -16,6 +16,7 @@
  * 부재 두께는 세월교 승계(측벽 0.2·상판 0.3·저판 0.3)이며 백엔드가 실어 보낸다.
  * ========================================================================== */
 
+import { groundLine } from "./B06_Section_UI_Cross_Wall_Hatch";
 import type { BoxSet, CrossSection, SectionSample } from "./B06_Section_Api_Fetch";
 import type {
   BasinLayout,
@@ -74,6 +75,8 @@ export interface BoxSideLayout {
 
 export interface BoxLayout {
   box: BoxSet;
+  /** 원지반 — 도수로 · 돌붙임 길이가 사면보다 길면 이어 그림(294-4). */
+  ground?: OffsetPoint[];
   sides: BoxSideLayout[];
   /** 상판 폴리곤(좌·우 표고가 다르면 기울어진다). */
   topSlab: OffsetPoint[];
@@ -222,6 +225,7 @@ export function computeBoxLayout(
   const apronLengthOf = (side: BoxSideLayout): number =>
     side.apron.length ? Math.abs(side.apron[1].offset - side.apron[0].offset) : 0;
   return {
+    ground: groundLine(groundSamples),
     box,
     sides: [left, right],
     topSlab: quad(0, barrelTopDrop),
diff --git a/B06_Section/B06_Section_UI_Cross_Culvert.ts b/B06_Section/B06_Section_UI_Cross_Culvert.ts
index 6413b563e..226e9014b 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert.ts
@@ -125,6 +125,7 @@ export function appendCulvertOverlay(
         culvert.chute,
         x,
         toDisplayY,
+        layout.ground,
       );
     for (const segment of layout.outletFill.segments) {
       // 묻힌 유출 끝 = 3도 수평 절토선(보라 · 면적에도 듦 · 139-4) — 3도 선이 원지반을
diff --git a/B06_Section/B06_Section_UI_Cross_Culvert_Geom.ts b/B06_Section/B06_Section_UI_Cross_Culvert_Geom.ts
index 3e46b469e..0b66c0e2e 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert_Geom.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert_Geom.ts
@@ -6,6 +6,7 @@
  * (designTrim). 유입 = 상단측. 집수정은 `_Basin.ts`, 성토부·다단은 `_Extra.ts`.
  * ========================================================================== */
 
+import { groundLine } from "./B06_Section_UI_Cross_Wall_Hatch";
 import type { CrossSection, CulvertSideSpec, SectionSample } from "./B06_Section_Api_Fetch";
 import {
   revetWallSpec,
@@ -575,6 +576,7 @@ export function computeCulvertLayout(
   const outletSlope = outletWallFinal ? slopeOf(outletWallFinal) : null;
 
   return {
+    ground: groundLine(groundSamples),
     inletOptions,
     culvert,
     pipe: { inlet: pipeStart, outlet, lengthM, slopePct },
diff --git a/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts b/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts
index 8ffe3bed8..1b21ed7cc 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts
@@ -201,6 +201,8 @@ export interface OutletFillSegment {
 
 export interface CulvertLayout {
   culvert: CulvertSet;
+  /** 원지반 — 도수로 · 돌붙임 길이가 사면보다 길면 이어 그림(294-4). */
+  ground?: OffsetPoint[];
   pipe: { inlet: OffsetPoint; outlet: OffsetPoint; lengthM: number; slopePct: number };
   /** 관 축·법선 단위벡터(그리기가 두께 방향으로 밀 때 쓴다). */
   pipeAxis: { axis: OffsetPoint; normal: OffsetPoint };
diff --git a/B06_Section/B06_Section_UI_Cross_Ford.ts b/B06_Section/B06_Section_UI_Cross_Ford.ts
index fde0f514b..62082530c 100644
--- a/B06_Section/B06_Section_UI_Cross_Ford.ts
+++ b/B06_Section/B06_Section_UI_Cross_Ford.ts
@@ -144,6 +144,7 @@ export function appendFordOverlay(
       ford.chute,
       x,
       toDisplayY,
+      layout.ground,
     );
   // ④ 계류측 마감선 — 구조물이 원지반 위면 성토부선, 안이면 절토선(집수정과 같은 체계).
   for (const side of layout.sides) {
diff --git a/B06_Section/B06_Section_UI_Cross_Ford_Geom.ts b/B06_Section/B06_Section_UI_Cross_Ford_Geom.ts
index 5c4bfb605..b3ba4642f 100644
--- a/B06_Section/B06_Section_UI_Cross_Ford_Geom.ts
+++ b/B06_Section/B06_Section_UI_Cross_Ford_Geom.ts
@@ -19,6 +19,7 @@
  * 성토측이라도 기슭막이 세트(다단·재질)와는 연계하지 않는다.
  * ========================================================================== */
 
+import { groundLine } from "./B06_Section_UI_Cross_Wall_Hatch";
 import type { CrossSection, FordSet, SectionSample } from "./B06_Section_Api_Fetch";
 import { GUARD_CUT_BERM_M, pipeWallThicknessM } from "./B06_Section_UI_Cross_Culvert_Const";
 import type {
@@ -108,6 +109,8 @@ export interface FordSideLayout {
 
 export interface FordLayout {
   ford: FordSet;
+  /** 원지반 — 도수로 · 돌붙임 길이가 사면보다 길면 이어 그림(294-4). */
+  ground?: OffsetPoint[];
   sides: FordSideLayout[];
   /** 두 측벽 사이를 잇는 바닥판. */
   slabBridge: OffsetPoint[];
@@ -329,6 +332,7 @@ export function computeFordLayout(
 
   const countText = ford.pipe_count > 1 ? ` ${ford.pipe_count}련` : "";
   return {
+    ground: groundLine(groundSamples),
     ford,
     sides,
     slabBridge,
diff --git a/B06_Section/B06_Section_UI_Cross_Ford_Pavement.ts b/B06_Section/B06_Section_UI_Cross_Ford_Pavement.ts
index 37d5d4320..f6e241919 100644
--- a/B06_Section/B06_Section_UI_Cross_Ford_Pavement.ts
+++ b/B06_Section/B06_Section_UI_Cross_Ford_Pavement.ts
@@ -13,7 +13,7 @@
 import type { CrossDesign } from "./B06_Section_Api_Fetch";
 import type { OffsetPoint } from "./B06_Section_UI_Cross_Culvert_Types";
 import { appendPavementOverlay } from "./B06_Section_UI_Cross_Design_Surface";
-import { appendChuteBand } from "./B06_Section_UI_Cross_Wall_Hatch";
+import { appendChuteBand, chuteRun } from "./B06_Section_UI_Cross_Wall_Hatch";
 
 /** 백엔드 `section.ford_pavement` 제원(치수 결정은 서버 몫 — 여기서는 좌표만 만든다). */
 export interface FordPavementSpec {
@@ -102,6 +102,8 @@ export function appendFordPavementOverlay(
   design: CrossDesign,
   x: (offset: number) => number,
   y: (elevation: number) => number,
+  /** 원지반 — 도수로 띠가 원지반에 닿으면 끝 · 길이가 사면보다 길면 이어 그림(294-4). */
+  ground?: readonly OffsetPoint[],
 ): boolean {
   const edges = fordEdges(design);
   if (!spec || !edges) return false;
@@ -130,7 +132,7 @@ export function appendFordPavementOverlay(
       ),
     );
   if (spec.chute)
-    appendChuteBand(svg, [{ points: fordChuteLine(design, spec.chute) }], spec.chute, x, y);
+    appendChuteBand(svg, [{ points: fordChuteLine(design, spec.chute, ground) }], spec.chute, x, y);
   return true;
 }
 
@@ -143,18 +145,38 @@ export function fordEdges(design: CrossDesign): CrossDesign["road_edges"] | unde
   return reach.side === "left" ? { ...edges, left: end } : { ...edges, right: end };
 }
 
+/** 원지반 꺾은선의 그 오프셋 표고(밖은 끝값). */
+function groundZ(ground: readonly OffsetPoint[], offset: number): number | null {
+  if (!ground.length) return null;
+  if (offset <= ground[0].offset) return ground[0].elevation;
+  for (let i = 1; i < ground.length; i += 1) {
+    const [a, b] = [ground[i - 1], ground[i]];
+    if (offset > b.offset) continue;
+    const span = b.offset - a.offset;
+    return span > 1e-9
+      ? a.elevation + ((b.elevation - a.elevation) * (offset - a.offset)) / span
+      : b.elevation;
+  }
+  return ground[ground.length - 1].elevation;
+}
+
 /**
- * 유출측(`inflowLeft` 반대) 노견 바깥 성토사면 선(136-2) — 설계선을 노견에서 바깥으로 따라
- * 내려가는 동안만(오르면 절토라 멈춤). 성토가 없으면 빈 선(띠 안 그림).
+ * 유출측(낮은 쪽) 성토사면 선(136-2 · 294-4) — 낮은 쪽 끝단(늘인 노면 끝 · 아니면 유출 쪽 노견 끝)에서
+ * 설계선을 바깥으로 따라 내려가는 동안만(오르면 절토라 멈춤) · 원지반(`ground`)에 닿으면 끝.
+ * 성토가 없으면(끝단이 이미 원지반 · 양측 절토 물넘이) 점 하나 = 띠 없음.
  */
-export function outletFillLine(design: CrossDesign): OffsetPoint[] {
-  const edges = design.road_edges;
+export function outletFillLine(
+  design: CrossDesign,
+  ground?: readonly OffsetPoint[],
+): OffsetPoint[] {
+  const edges = fordEdges(design);
   if (!edges || !design.design_line?.length) return [];
-  const outward = inflowLeft(design) ? -1 : 1; // +offset = 좌측 · 유입 반대
-  const edge =
-    outward > 0
-      ? Math.max(edges.left.offset_m, edges.right.offset_m)
-      : Math.min(edges.left.offset_m, edges.right.offset_m);
+  const reach = design.tilt_reach;
+  const outLeft = reach ? reach.side === "left" : !inflowLeft(design); // +offset = 좌측
+  const outward = outLeft ? 1 : -1;
+  const edge = outLeft
+    ? Math.max(edges.left.offset_m, edges.right.offset_m)
+    : Math.min(edges.left.offset_m, edges.right.offset_m);
   const points = design.design_line
     .filter((p) => (p.offset_m - edge) * outward >= -1e-6)
     .sort((a, b) => (a.offset_m - b.offset_m) * outward);
@@ -163,31 +185,25 @@ export function outletFillLine(design: CrossDesign): OffsetPoint[] {
     const last = line[line.length - 1];
     if (last && p.elevation_m > last.elevation + 1e-6) break;
     line.push({ offset: p.offset_m, elevation: p.elevation_m });
+    const z = ground ? groundZ(ground, p.offset_m) : null;
+    if (z !== null && Math.abs(z - p.elevation_m) < 1e-3) break; // 원지반에 닿음 = 끝
   }
   return line;
 }
 
 /**
- * 물넘이 도수로 · 돌붙임 선(286-3) — 유출 성토사면 선을 노견에서 사면 따라 `length_m` 까지 자름 ·
- * 비거나 사면보다 길면 원지반까지. 횡단 띠 · 3D 띠가 같이 씀(그림 전용).
+ * 물넘이 도수로 · 돌붙임 선(286-3 · 294-4) — 낮은 쪽 끝단에서 성토사면 따라 · 길이 비움 = 원지반 닿으면 끝 ·
+ * 길이 넣음 = 그 길이(사면보다 길면 원지반 따라 이어) · 양측 절토(늘인 노면 끝이 원지반) = 길이 없으면 안 그림.
+ * 횡단 띠 · 3D 띠가 같이 씀(그림 전용).
  */
-export function fordChuteLine(design: CrossDesign, chute?: { length_m?: number }): OffsetPoint[] {
-  const line = outletFillLine(design);
-  let left = chute?.length_m ?? 0;
-  if (!(left > 0)) return line;
-  const out = line.slice(0, 1);
-  for (let i = 1; i < line.length && left > 1e-9; i += 1) {
-    const [a, b] = [line[i - 1], line[i]];
-    const step = Math.hypot(b.offset - a.offset, b.elevation - a.elevation);
-    if (step < 1e-9) continue;
-    const t = Math.min(left / step, 1);
-    out.push({
-      offset: a.offset + (b.offset - a.offset) * t,
-      elevation: a.elevation + (b.elevation - a.elevation) * t,
-    });
-    left -= step;
-  }
-  return out;
+export function fordChuteLine(
+  design: CrossDesign,
+  chute?: { length_m?: number },
+  ground?: readonly OffsetPoint[],
+): OffsetPoint[] {
+  return (
+    chuteRun([{ points: outletFillLine(design, ground) }], chute?.length_m, ground)[0]?.points ?? []
+  );
 }
 
 /**
diff --git a/B06_Section/B06_Section_UI_Cross_View.ts b/B06_Section/B06_Section_UI_Cross_View.ts
index 7f797e240..d45a76c81 100644
--- a/B06_Section/B06_Section_UI_Cross_View.ts
+++ b/B06_Section/B06_Section_UI_Cross_View.ts
@@ -23,7 +23,7 @@ import { ownWallsDrawAt } from "./B06_Section_UI_Cross_Culvert_Wire";
 import { attachShapePick, shapePickRoute } from "./B06_Section_UI_Cross_Shape_Pick";
 import { appendUnderdrainOverlay } from "./B06_Section_UI_Cross_Underdrain";
 import { raiseWalls } from "./B06_Section_UI_Cross_Wall";
-import { attachChuteBandPick } from "./B06_Section_UI_Cross_Wall_Hatch";
+import { attachChuteBandPick, groundLine } from "./B06_Section_UI_Cross_Wall_Hatch";
 import { appendSpoilFillOverlay } from "./B06_Section_UI_Cross_SpoilFill";
 import { appendRevetmentOverlay, computeRevetmentLayout } from "./B06_Section_UI_Cross_Revetment";
 import {
@@ -452,6 +452,7 @@ export function createCrossSectionCard(
         section.design,
         x,
         toDisplayY,
+        groundLine(section.samples ?? []),
       );
       if (!fordPaved)
         appendPavementOverlay(plotLayer, section.design, x, toDisplayY, section.pavement);
diff --git a/B06_Section/B06_Section_UI_Cross_Wall_Hatch.ts b/B06_Section/B06_Section_UI_Cross_Wall_Hatch.ts
index ab62c86d3..2b402938b 100644
--- a/B06_Section/B06_Section_UI_Cross_Wall_Hatch.ts
+++ b/B06_Section/B06_Section_UI_Cross_Wall_Hatch.ts
@@ -349,6 +349,77 @@ export function chuteBandOutline(
   return { top, normals, outline: [...top, ...bottom.reverse()] };
 }
 
+/** 꺾은선 앞에서부터 `lengthM` 까지(쓴 길이와 함께). */
+function trimPolyline(
+  points: readonly OffsetPoint[],
+  lengthM: number,
+): { points: OffsetPoint[]; used: number } {
+  const out = points.slice(0, 1);
+  let used = 0;
+  for (let i = 1; i < points.length && lengthM - used > 1e-9; i += 1) {
+    const [a, b] = [points[i - 1], points[i]];
+    const step = Math.hypot(b.offset - a.offset, b.elevation - a.elevation);
+    if (step < 1e-9) continue;
+    const t = Math.min((lengthM - used) / step, 1);
+    out.push({
+      offset: a.offset + (b.offset - a.offset) * t,
+      elevation: a.elevation + (b.elevation - a.elevation) * t,
+    });
+    used += step * t;
+  }
+  return { points: out, used };
+}
+
+/** 원지반 샘플 → 꺾은선(유효 점만 · 오프셋 차례). */
+export function groundLine(
+  samples: ReadonlyArray<{
+    offset_m?: number | null;
+    elevation_m?: number | null;
+    valid?: boolean;
+  }>,
+): OffsetPoint[] {
+  return samples
+    .filter((s) => s.valid !== false && s.offset_m != null && s.elevation_m != null)
+    .map((s) => ({ offset: s.offset_m as number, elevation: s.elevation_m as number }))
+    .sort((a, b) => a.offset - b.offset);
+}
+
+/**
+ * 도수로 · 돌붙임 선 길이(294-4) — 선들을 차례로 사면 따라 `lengthM` 까지 자름 · 사면보다 길면 마지막 끝에서
+ * 원지반(`ground`)을 바깥으로 따라 이어 그 길이까지 · 길이 없으면 그대로(원지반 닿으면 끝). 점 하나뿐인 선
+ * (사면 없음 · 끝이 이미 원지반)은 길이가 있으면 원지반 따라 · 없으면 안 그림. 그림 전용(수량 · 내역 무관).
+ */
+export function chuteRun<L extends { points: OffsetPoint[] }>(
+  lines: readonly L[],
+  lengthM?: number | null,
+  ground?: readonly OffsetPoint[],
+): L[] {
+  const drawn = (list: L[]) => list.filter((line) => line.points.length > 1);
+  if (!(lengthM && lengthM > 0) || !lines.length) return drawn([...lines]);
+  let left = lengthM;
+  const out: L[] = [];
+  for (const line of lines) {
+    if (left <= 1e-9) break;
+    const cut = trimPolyline(line.points, left);
+    out.push({ ...line, points: cut.points });
+    left -= cut.used;
+  }
+  const last = out[out.length - 1];
+  if (left > 1e-9 && ground?.length && last) {
+    const first = lines[0].points[0];
+    const end = last.points[last.points.length - 1];
+    const outward = Math.sign(end.offset - first.offset) || Math.sign(end.offset) || 1;
+    const along = [
+      end,
+      ...ground
+        .filter((p) => (p.offset - end.offset) * outward > 1e-6)
+        .sort((a, b) => (a.offset - b.offset) * outward),
+    ];
+    out.push({ ...last, points: trimPolyline(along, left).points });
+  }
+  return drawn(out);
+}
+
 /** 띠가 서는 유출 조각(152-3) — 성토 조각 + 내림 · 수평 절토 조각(3도 절토선 · 끝 ≤ 시작).
  *  3도 선이 못 만나 복합경사로 오르는 절토 조각은 뺌. B06 관 · 흙막이 띠와 3D 띠가 같은 거름. */
 export function isChuteSegment(segment: { kind?: string; points: OffsetPoint[] }): boolean {
@@ -365,13 +436,16 @@ export function isChuteSegment(segment: { kind?: string; points: OffsetPoint[] }
  */
 export function appendChuteBand(
   layer: SVGElement,
-  lines: ReadonlyArray<{ points: OffsetPoint[]; kind?: string }>,
-  chute: { structure: string; thickness_m: number },
+  allLines: ReadonlyArray<{ points: OffsetPoint[]; kind?: string }>,
+  chute: { structure: string; thickness_m: number; length_m?: number },
   x: (offset: number) => number,
   toDisplayY: (elevation: number) => number,
+  /** 원지반 — 길이가 사면보다 길면 이어 그림(294-4). */
+  ground?: readonly OffsetPoint[],
 ): void {
   const thickness = chute.thickness_m;
   if (!(thickness > 0)) return;
+  const lines = chuteRun(allLines, chute.length_m, ground);
   const pixelsPerMeter = Math.abs(x(1) - x(0)) || 1;
   const px = (p: OffsetPoint): [number, number] => [x(p.offset), toDisplayY(p.elevation)];
   for (const line of lines) {
@@ -383,7 +457,8 @@ export function appendChuteBand(
     band.setAttribute("class", "b06-chart__culvert-pitching");
     const title = document.createElementNS(SVG_NS, "title");
     const along = line.kind === "cut" ? "3도 절토선" : "성토사면";
-    title.textContent = `유출부 ${chute.structure} — 두께 ${thickness.toFixed(2)}m · ${along} 따라 원지반까지`;
+    const reach = chute.length_m ? `길이 ${chute.length_m.toFixed(2)}m` : "원지반까지";
+    title.textContent = `유출부 ${chute.structure} — 두께 ${thickness.toFixed(2)}m · ${along} 따라 ${reach}`;
     band.append(title);
     clipSeq += 1;
     const clipId = `b06-chute-clip-${clipSeq}`;
diff --git a/B07_DesignDetail/B07_DesignDetail_Cross_Overlay.ts b/B07_DesignDetail/B07_DesignDetail_Cross_Overlay.ts
index 6af40280b..dbce9f48d 100644
--- a/B07_DesignDetail/B07_DesignDetail_Cross_Overlay.ts
+++ b/B07_DesignDetail/B07_DesignDetail_Cross_Overlay.ts
@@ -18,6 +18,7 @@ import { appendCulvertOverlay } from "../B06_Section/B06_Section_UI_Cross_Culver
 import { appendFordOverlay } from "../B06_Section/B06_Section_UI_Cross_Ford";
 import { appendFordPavementOverlay } from "../B06_Section/B06_Section_UI_Cross_Ford_Pavement";
 import { appendUnderdrainOverlay } from "../B06_Section/B06_Section_UI_Cross_Underdrain";
+import { groundLine } from "../B06_Section/B06_Section_UI_Cross_Wall_Hatch";
 import {
   appendCrossDesignOverlay,
   appendPavementOverlay,
@@ -486,7 +487,8 @@ function drawDesign(
   y: (elevation: number) => number,
 ): void {
   const { design, culvert, box, ford, own } = layouts;
-  const paved = appendFordPavementOverlay(svg, section.ford_pavement, design, x, y);
+  const ground = groundLine(section.samples ?? []); // 물넘이 도수로 띠 끝 · 길이 이음(294-4)
+  const paved = appendFordPavementOverlay(svg, section.ford_pavement, design, x, y, ground);
   if (!paved) appendPavementOverlay(svg, design, x, y, section.pavement);
   appendUnderdrainOverlay(svg, section.underdrain, design, x, y); // 맹암거(288-1)
   appendCrossDesignOverlay(
diff --git a/resources/tester/helper_286_1_ford_pavement.cjs b/resources/tester/helper_286_1_ford_pavement.cjs
index dc98731df..0d0b018cc 100644
--- a/resources/tester/helper_286_1_ford_pavement.cjs
+++ b/resources/tester/helper_286_1_ford_pavement.cjs
@@ -24,7 +24,10 @@ const input = JSON.parse(fs.readFileSync(process.argv[2], "utf8"));
 const station = loadTs(path.join(ROOT, "common_util", "common_util_structure_station.ts"));
 
 const ford = loadTs(path.join(ROOT, "B06_Section", "B06_Section_UI_Cross_Ford_Pavement.ts"), {
-  "./B06_Section_UI_Cross_Wall_Hatch": { appendChuteBand() {} },
+  "./B06_Section_UI_Cross_Wall_Hatch": loadTs(
+    path.join(ROOT, "B06_Section", "B06_Section_UI_Cross_Wall_Hatch.ts"),
+    { "./B06_Section_UI_Cross_Culvert_Const": {} },
+  ),
   "./B06_Section_UI_Cross_Design_Surface": { appendPavementOverlay() {} },
 });
 // 286-3 도수로 · 돌붙임 길이 — 유출(좌 · 우가 높음) 성토사면 1:1.5(5 m 내려감 · 사면 길이 √(7.5²+5²) ≈ 9.01)
diff --git a/resources/tester/helper_294_3_ford_extend_chute.cjs b/resources/tester/helper_294_3_ford_extend_chute.cjs
index 646a89802..0a3dc1bf9 100644
--- a/resources/tester/helper_294_3_ford_extend_chute.cjs
+++ b/resources/tester/helper_294_3_ford_extend_chute.cjs
@@ -55,8 +55,40 @@ pave.appendFordPavementOverlay(
 );
 const paveLayer = svg.children.find((k) => (k.attrs.class ?? "").includes("ford-pavement"));
 
+// 294-4 도수로 · 돌붙임 끝단 · 길이
+const hatch = load(path.join(ROOT, "B06_Section", "B06_Section_UI_Cross_Wall_Hatch.ts"));
+const P = (offset, elevation) => ({ offset, elevation });
+const slope = [{ points: [P(0, 0), P(3, -4)], kind: "fill" }]; // 사면 5 m
+const flat = [P(3, -4), P(5, -4), P(8, -4)]; // 사면 끝 바깥 원지반
+const pts = (lines) =>
+  lines.map((l) => l.points.map((p) => [+p.offset.toFixed(4), +p.elevation.toFixed(4)]));
+const dipGround = hatch.groundLine(input.dipSamples);
+const fillGround = hatch.groundLine(input.fillSamples);
+const calc = load(path.join(ROOT, "A00_Common", "design", "design_structure_ford_calc.ts"));
+const formOf = (state) => ({ state: () => state, setValue: (c, i, v) => (state[c][0][i] = v) });
+const fordState = { ford: [{ width: "8" }], chute_add: [{ length_m: "2.5", area: "30" }] };
+calc.syncChuteArea(formOf(fordState), { id: "chute_add" }, { id: "length_m" }, "chute_add", "ford");
+const guard = load(path.join(ROOT, "A00_Common", "design", "design_structure_guard.ts"));
+const fordPave = load(path.join(ROOT, "A00_Common", "design", "design_structure_ford_pavement.ts"));
+
 const out = {
   edges: pave.fordEdges(design),
   pavePoints: paveLayer?.attrs.points ?? null,
+  runNone: pts(hatch.chuteRun(slope)),
+  runShort: pts(hatch.chuteRun(slope, 2)),
+  runLong: pts(hatch.chuteRun(slope, 7, flat)),
+  runPointOnly: pts(hatch.chuteRun([{ points: [P(3, -4)] }])),
+  runPointLength: pts(hatch.chuteRun([{ points: [P(3, -4)] }], 2, flat)),
+  dipLine: pave.outletFillLine(design, dipGround),
+  dipChute: pave.fordChuteLine(design, {}, dipGround),
+  dipChuteLength: pave.fordChuteLine(design, { length_m: 1.5 }, dipGround),
+  fillLine: pave.outletFillLine(input.fillDesign, fillGround),
+  fillLineOld: pave.outletFillLine(input.fillDesign),
+  fillChuteLength: pave.fordChuteLine(input.fillDesign, { length_m: 1 }, fillGround),
+  fordArea: fordState.chute_add[0].area,
+  chuteItems: guard.CHUTE_ITEMS.map((i) => i.id),
+  fordPaveChuteSame:
+    fordPave.FORD_PAVEMENT_SPEC.containers.find((c) => c.id === "chute").items ===
+    guard.CHUTE_ITEMS,
 };
 process.stdout.write(JSON.stringify(out));
diff --git a/resources/tester/test_152_3_chute_cut.py b/resources/tester/test_152_3_chute_cut.py
index 01421f9d3..e3870b7c6 100644
--- a/resources/tester/test_152_3_chute_cut.py
+++ b/resources/tester/test_152_3_chute_cut.py
@@ -55,9 +55,8 @@ def test_거름_한_벌_배선() -> None:
     culvert = _src("B06_Section/B06_Section_UI_Cross_Culvert.ts")
     assert "layout.outletFill.segments.filter(isChuteSegment)," in culvert
     corridor = _src("B05_Profile/B05_Profile_UI_Corridor_Structures.ts")
-    assert (
-        "chuteBands(layout.outletFill.segments, section.culvert?.chute, isChuteSegment)" in corridor
-    )
+    flat = " ".join(corridor.split())
+    assert "chuteBands( layout.outletFill.segments, section.culvert?.chute, isChuteSegment," in flat
     hatch = _src("B06_Section/B06_Section_UI_Cross_Wall_Hatch.ts")
     assert '"3도 절토선"' in hatch
     # 박스 · 세월교 본체 끝은 성토만(3도 규칙 안 넓힘)
diff --git a/resources/tester/test_286_1_ford_pavement_design.py b/resources/tester/test_286_1_ford_pavement_design.py
index da373f8af..a880eedad 100644
--- a/resources/tester/test_286_1_ford_pavement_design.py
+++ b/resources/tester/test_286_1_ford_pavement_design.py
@@ -174,8 +174,7 @@ def test_도수로_길이_없음_원지반까지_있음_그_길이(ts):
 def test_컨테이너_같은_칸_맨_아래_길이():
     spec = _read("A00_Common", "design", "design_structure_ford_pavement.ts")
     assert (
-        'items: [...CHUTE_ITEMS, { id: "length_m", label: "길이 (m)", kind: "number", step: 0.1 }],'
-        in spec
+        "items: CHUTE_ITEMS," in spec  # 공용 칸 맨 아래 길이(294-4 · CHUTE_ITEMS 로 옮김)
     )
 
 
diff --git a/resources/tester/test_294_3_ford_extend_chute.py b/resources/tester/test_294_3_ford_extend_chute.py
index 90056560a..e20bb8560 100644
--- a/resources/tester/test_294_3_ford_extend_chute.py
+++ b/resources/tester/test_294_3_ford_extend_chute.py
@@ -5,6 +5,10 @@
     처음 만나는 자리까지(그 쪽 절토 사면 없음 · `tilt_reach`) · 성토 쪽 그대로 · 반폭 안에서 못 만나면 옛 길 ·
     서버 정본 ↔ TS 짝 같은 값 = 횡단 설계 거울(`test_b06_cross_design_mirror` 「물넘이포장 낮은 쪽 노면
     연장」) · 그림 = 콘크리트(포장층)가 늘인 끝까지.
+  - 294-4 도수로/돌붙임 띠 = 낮은 쪽 끝단(늘인 끝 · 아니면 유출 쪽 노견 끝)에서 성토 사면 따라 · 길이 비움 =
+    원지반 닿으면 끝 · 양측 절토 물넘이 = 띠 없음 · 길이 = 그 길이(사면보다 길면 원지반 따라) · 다른 구조물
+    (배관 · 박스 · 세월교) 같은 규칙(`chuteRun` · 원지반 `layout.ground`) + 같은 「길이 (m)」 칸 · 면적 = 세월교만
+    월류 폭 × 길이(배관 · 박스 = 폭 정의 없어 자동 안 함) · 길이는 집계 · B08 수량에 안 실림.
 
 진짜 TS 는 `helper_294_3_ford_extend_chute.cjs` 가 Node 로 돌림. 화면은 사용자 확인.
 """
@@ -60,7 +64,15 @@ def dip() -> dict:
 @pytest.fixture(scope="module")
 def ts(dip, tmp_path_factory) -> dict:
     source = tmp_path_factory.mktemp("s294") / "in.json"
-    source.write_text(json.dumps({"design": dip}), encoding="utf-8")
+    fill_samples = _line(lambda o: 100.0 + 0.35 * o)
+    fill = compute_cross_design(fill_samples, 100.4, **KW)
+    payload = {
+        "design": dip,
+        "dipSamples": _dip_ground(),
+        "fillSamples": fill_samples,
+        "fillDesign": fill,
+    }
+    source.write_text(json.dumps(payload), encoding="utf-8")
     proc = subprocess.run(
         ["node", str(HERE / "helper_294_3_ford_extend_chute.cjs"), str(source)],
         capture_output=True,
@@ -110,3 +122,80 @@ def test_콘크리트는_늘인_끝까지(dip, ts):
     }
     first = ts["pavePoints"].split()[1]  # 포장층 윗면 우 끝
     assert float(first.split(",")[0]) == pytest.approx(-4.3333, abs=1e-4)
+
+
+def test_띠_길이_맞춤_공용(ts):
+    assert ts["runNone"] == [[[0, 0], [3, -4]]]  # 길이 없음 = 원지반 닿으면 끝(그대로)
+    assert ts["runShort"] == [[[0, 0], [1.2, -1.6]]]  # 길이 2 = 사면 따라 2 m
+    assert ts["runLong"] == [[[0, 0], [3, -4]], [[3, -4], [5, -4]]]  # 사면 5 + 원지반 2
+    assert ts["runPointOnly"] == []  # 끝단이 이미 원지반 · 길이 없음 = 안 그림
+    assert ts["runPointLength"] == [[[3, -4], [5, -4]]]
+
+
+def test_양측_절토_물넘이_띠_없음(ts):
+    assert len(ts["dipLine"]) == 1  # 늘인 끝이 원지반
+    assert ts["dipLine"][0]["offset"] == pytest.approx(-4.3333, abs=1e-4)
+    assert ts["dipChute"] == []
+    tail = ts["dipChuteLength"]  # 길이를 넣으면 늘인 끝에서 원지반 따라 그 길이
+    assert tail[0]["offset"] == pytest.approx(-4.3333, abs=1e-4) and len(tail) >= 2
+
+
+def test_성토_쪽_띠는_원지반_닿으면_끝(ts):
+    line = ts["fillLine"]
+    end = line[-1]
+    assert end["elevation"] == pytest.approx(100.0 + 0.35 * end["offset"], abs=1e-3)  # 원지반 위
+    assert len(ts["fillLineOld"]) > len(line)  # 원지반을 모르면 내려가는 원지반까지 따라갔음
+    chute = ts["fillChuteLength"]
+    start, stop = chute[0], chute[-1]
+    assert (stop["offset"] - start["offset"]) ** 2 + (
+        stop["elevation"] - start["elevation"]
+    ) ** 2 == pytest.approx(1.0, abs=1e-6)
+
+
+def test_다른_구조물_같은_규칙과_길이_칸(ts):
+    assert ts["chuteItems"][-1] == "length_m"
+    assert ts["fordPaveChuteSame"] is True
+    assert ts["fordArea"] == "20"  # 세월교 월류 폭 8 × 길이 2.5
+    hatch = (ROOT / "B06_Section" / "B06_Section_UI_Cross_Wall_Hatch.ts").read_text(
+        encoding="utf-8"
+    )
+    assert "const lines = chuteRun(allLines, chute.length_m, ground);" in hatch
+    for name in ("Culvert", "Box", "Ford"):
+        overlay = (ROOT / "B06_Section" / f"B06_Section_UI_Cross_{name}.ts").read_text(
+            encoding="utf-8"
+        )
+        assert "layout.ground," in overlay
+    form = (ROOT / "B05_Profile" / "B05_Profile_UI_Drainage_Facility.ts").read_text(
+        encoding="utf-8"
+    )
+    assert form.count("syncChuteArea(") == 2  # 물넘이 · 세월교만(배관 · 박스 = 폭 정의 없음)
+
+
+def test_길이는_집계_수량에_안_실림():
+    from B06_Section.B06_Section_Engine_Culvert import _chute
+    from B08_Quantity.B08_Quantity_Router_Summary import _chutes
+    from M02_MasterTemplete.M02_Table_Fill_Spec import container_rows
+
+    options = {
+        "chute_add_1_structure": "돌붙임",
+        "chute_add_1_bond": "찰붙임",
+        "chute_add_1_area": 12,
+    }
+    longer = {**options, "chute_add_1_length_m": 7}
+    assert _chute(longer)["length_m"] == 7 and "length_m" not in _chute(options)
+
+    class Sheet:
+        def __init__(self) -> None:
+            self.rows: list[tuple] = []
+
+        def add(self, at, key, sort, group, label, value, combos) -> None:
+            self.rows.append((key, label, value))
+
+    sheet = Sheet()
+    _chutes(sheet, 50.0, longer, {"gchuteadd1": "SS1"}, {})
+    assert sheet.rows == [("chute|찰붙임", "㎡", 12.0)]
+    item = {"type_id": "pipe", "options": options, "복사본": "pipe@50.0", "흙막이단": 0}
+    plain = container_rows(item, {"gchuteadd1": "SS1"})
+    long = container_rows({**item, "options": longer}, {"gchuteadd1": "SS1"})
+    for key in ("length_m", "inlet_revet_length_m", "outlet_revet_length_m", "area_m"):
+        assert plain[0]["options"].get(key) == long[0]["options"].get(key)
diff --git a/resources/tester/test_52_4_structure_spec_ford.py b/resources/tester/test_52_4_structure_spec_ford.py
index 218a7f2b2..a7a4dd1ca 100644
--- a/resources/tester/test_52_4_structure_spec_ford.py
+++ b/resources/tester/test_52_4_structure_spec_ford.py
@@ -113,4 +113,7 @@ def test_정의_파일에_세월교_이름_표가_올라_있음():
         os.path.join(ROOT, "resources", "master_template", "구조물정의.json"), encoding="utf-8"
     ) as f:
         doc = json.load(f)
-    assert doc["종류"]["ford_bridge"]["이름"] == names
+    # 그림 전용 길이 칸(294-4)은 마스터 정의 이름 표에 안 올림(마스터 손대지 않음) — 대조 밖
+    assert doc["종류"]["ford_bridge"]["이름"] == {
+        k: v for k, v in names.items() if k != "chute_add.length_m"
+    }
diff --git a/resources/tester/test_52_structure_spec_box.py b/resources/tester/test_52_structure_spec_box.py
index a9b7bf0ca..5bc8c469d 100644
--- a/resources/tester/test_52_structure_spec_box.py
+++ b/resources/tester/test_52_structure_spec_box.py
@@ -102,7 +102,8 @@ def test_정의_파일에_이름_표_그룹_선택지가_올라_있음():
         os.path.join(ROOT, "resources", "master_template", "구조물정의.json"), encoding="utf-8"
     ) as f:
         doc = json.load(f)
-    assert set(names) == set(doc["종류"]["box_culvert"]["이름"])
+    # 그림 전용 길이 칸(294-4)은 마스터 정의 이름 표에 안 올림(마스터 손대지 않음) — 대조 밖
+    assert set(names) - {"chute_add.length_m"} == set(doc["종류"]["box_culvert"]["이름"])
     assert [g["id"] for g in doc["그룹"]["box_culvert"]] == ["gboxbody", "gboxin", "gboxout"]
     box = next(t for t in doc["types"] if t["type_id"] == "box_culvert")
     wing = {o["key"]: o for o in box["options"]}
diff --git a/resources/tester/test_52_structure_spec_pipe.py b/resources/tester/test_52_structure_spec_pipe.py
index 88277e3d1..64b33b570 100644
--- a/resources/tester/test_52_structure_spec_pipe.py
+++ b/resources/tester/test_52_structure_spec_pipe.py
@@ -107,5 +107,6 @@ def test_정의_파일에_이름_표가_올라_있음():
     ) as f:
         doc = json.load(f)
     on_file = doc["종류"]["pipe"]["이름"]
-    assert set(names) == set(on_file)
+    # 그림 전용 길이 칸(294-4)은 마스터 정의 이름 표에 안 올림(마스터 손대지 않음) — 대조 밖
+    assert set(names) - {"chute_add.length_m"} == set(on_file)
     assert on_file["inlet.structure=기슭막이"] == "흙막이"
diff --git a/resources/tester/test_65_ford_defaults.py b/resources/tester/test_65_ford_defaults.py
index 3fc31aa01..e856893c9 100644
--- a/resources/tester/test_65_ford_defaults.py
+++ b/resources/tester/test_65_ford_defaults.py
@@ -73,6 +73,7 @@ def test_유입_유출은_구조와_흙막이_칸만(out):
             ["bond", None, "메붙임"],
             ["thickness", None, "45"],
             ["area", None, "30"],
+            ["length_m", None, None],  # 그림 전용 길이(294-4)
         ]
         keys = out[f"{spec}Keys"]
         assert keys["prefixes"] == ["soil_add_", "chute_add_"]