From 2a247184fd287ef929d699aba6b2e3a828c480f4 Mon Sep 17 00:00:00 2001
From: umsangdon <umsangdon@gmail.com>
Date: Sat, 22 Aug 2026 17:50:45 +0900
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- 집수정 조정값(BasinAdjust: 내공 폭·높이, 좌우 lateralM, 상하 slopeM) 신설.
  측점별 세션 보관 + 백엔드 design.basin_adjust 저장 경로(Schema·Router) 연동
- 조정창에 집수정 조정 항목 추가, I형 관 시작점을 벽 안쪽 변과 원지반의
  교차점으로 산출(이분법), 집수정 성토(되메움)선 5° → 성토 비탈 1:1.2로 통일
- 설계선 트림 수정: 배수관 레이아웃이 사면 폴리라인을 준 쪽은 그 시작점(노견)에서
  설계선을 끊는다 — 종전에는 트림 경계에서 끝점 표고를 벽 상단으로 강제 스냅해
  집수정을 좌우로 옮기면 마지막 구간이 수직으로 튀는 선이 남았다(사용자 지적)
- basinApproachPoints의 길이 0 중복 꼭짓점 제거

검증: 4+4.3(집수정 I형 좌우 2.9m 이동)·13+15.7·5+0.0·2+0.0에서 급경사
세그먼트 0건 · tsc --noEmit 통과 · ruff check 통과 · prettier 적용 ·
pytest tmp/tests/ 148 passed, 7 skipped · B06_Section 700줄 초과 0건.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 B06_Section/B06_Section_Api_Fetch.ts          |  14 +++
 B06_Section/B06_Section_Router.py             |   9 +-
 B06_Section/B06_Section_Router_Confirm.py     |   4 +
 B06_Section/B06_Section_Router_Design.py      |   4 +
 B06_Section/B06_Section_Schema.py             |  11 ++
 B06_Section/B06_Section_UI_Cross_Culvert.ts   |   5 +-
 .../B06_Section_UI_Cross_Culvert_Basin.ts     | 103 ++++++++++++++++--
 .../B06_Section_UI_Cross_Culvert_Const.ts     |   8 +-
 .../B06_Section_UI_Cross_Culvert_Geom.ts      |  37 ++++---
 .../B06_Section_UI_Cross_Culvert_Types.ts     |  15 +++
 .../B06_Section_UI_Cross_Culvert_Wire.ts      |   5 +
 B06_Section/B06_Section_UI_Cross_Design.ts    |  18 ++-
 .../B06_Section_UI_Cross_Structure_Panel.ts   |  70 +++++++++++-
 B06_Section/B06_Section_UI_Cross_View.ts      |  13 +++
 B06_Section/B06_Section_UI_Page.ts            |  20 +++-
 .../B06_Section_UI_Page_Station_Controls.ts   |  69 +++++++++++-
 .../B06_Section_UI_Style_Cross_Controls.css   |  10 ++
 17 files changed, 362 insertions(+), 53 deletions(-)

diff --git a/B06_Section/B06_Section_Api_Fetch.ts b/B06_Section/B06_Section_Api_Fetch.ts
index ed498fc1..8402739f 100644
--- a/B06_Section/B06_Section_Api_Fetch.ts
+++ b/B06_Section/B06_Section_Api_Fetch.ts
@@ -244,6 +244,13 @@ export type DitchType = "standard" | "l_type";
 
 /** 측점 표준횡단 설계 계산 결과(잠정치). data.design에 저장되는 구조와 동일. */
 export interface CrossDesign {
+  inlet_structure?: "auto" | "revet" | "I" | "L" | "U";
+  basin_adjust?: {
+    innerWidthM: number;
+    innerHeightM: number;
+    lateralM: number;
+    slopeM: number;
+  };
   ground_type: GroundType;
   geometry_preset: "soil" | "rock";
   section_mode: SectionMode;
@@ -333,6 +340,13 @@ export interface CrossSectionPatch {
   rock_boundary_offset_m?: number;
   /** 측점 개별 표시 반폭(m, 2026-08-06 사용자 지시). */
   display_half_width_m?: number;
+  inlet_structure?: "auto" | "revet" | "I" | "L" | "U";
+  basin_adjust?: {
+    innerWidthM: number;
+    innerHeightM: number;
+    lateralM: number;
+    slopeM: number;
+  };
 }
 
 /** 공통 fetch 헬퍼: 타임아웃 + 인증 헤더 + 오류 응답 변환. */
diff --git a/B06_Section/B06_Section_Router.py b/B06_Section/B06_Section_Router.py
index 7ef13814..52987849 100644
--- a/B06_Section/B06_Section_Router.py
+++ b/B06_Section/B06_Section_Router.py
@@ -640,11 +640,10 @@ async def compute_cross_section_design(
             for record in stored_designs:
                 if abs(float(record["chainage_m"]) - request.chainage_m) < 0.01:
                     stored_design = record.get("design")
-                    if (
-                        isinstance(stored_design, dict)
-                        and stored_design.get("display_half_width_m") is not None
-                    ):
-                        design["display_half_width_m"] = stored_design["display_half_width_m"]
+                    if isinstance(stored_design, dict):
+                        for key in ("display_half_width_m", "inlet_structure", "basin_adjust"):
+                            if stored_design.get(key) is not None:
+                                design[key] = stored_design[key]
                     break
             await connection.begin()
             try:
diff --git a/B06_Section/B06_Section_Router_Confirm.py b/B06_Section/B06_Section_Router_Confirm.py
index bb603b3b..3f260526 100644
--- a/B06_Section/B06_Section_Router_Confirm.py
+++ b/B06_Section/B06_Section_Router_Confirm.py
@@ -79,6 +79,10 @@ async def _apply_section_edits(
                 patch["rock_boundary_offset_m"] = patch_item.rock_boundary_offset_m
             if patch_item.display_half_width_m is not None:
                 patch["display_half_width_m"] = patch_item.display_half_width_m
+            if patch_item.inlet_structure is not None:
+                patch["inlet_structure"] = patch_item.inlet_structure
+            if patch_item.basin_adjust is not None:
+                patch["basin_adjust"] = patch_item.basin_adjust.model_dump()
             if patch:
                 await merge_cross_section_design_patch(
                     connection, route_id=route_id, chainage_m=patch_item.chainage_m, patch=patch
diff --git a/B06_Section/B06_Section_Router_Design.py b/B06_Section/B06_Section_Router_Design.py
index 39b9452a..da71fd09 100644
--- a/B06_Section/B06_Section_Router_Design.py
+++ b/B06_Section/B06_Section_Router_Design.py
@@ -136,4 +136,8 @@ def recompute_designs_for_alignment(
         design.update(status="provisional", pavement_suggested=suggested)
         if stored.get("display_half_width_m") is not None:
             design["display_half_width_m"] = stored["display_half_width_m"]
+        if stored.get("inlet_structure") is not None:
+            design["inlet_structure"] = stored["inlet_structure"]
+        if stored.get("basin_adjust") is not None:
+            design["basin_adjust"] = stored["basin_adjust"]
         section["design"] = design
diff --git a/B06_Section/B06_Section_Schema.py b/B06_Section/B06_Section_Schema.py
index 9165cf42..aeb56084 100644
--- a/B06_Section/B06_Section_Schema.py
+++ b/B06_Section/B06_Section_Schema.py
@@ -66,6 +66,15 @@ class CrossDesignResponse(BaseModel):
     design: dict[str, Any]
 
 
+class BasinAdjustPatch(BaseModel):
+    """집수정 내부 치수와 기본 위치 대비 이동량."""
+
+    innerWidthM: float = Field(..., ge=1.0, le=2.0)
+    innerHeightM: float = Field(..., ge=1.0, le=2.0)
+    lateralM: float = Field(..., ge=0.0, le=10.0)
+    slopeM: float = Field(..., ge=0.0, le=10.0)
+
+
 class CrossSectionPatch(BaseModel):
     """확정 시 측점별 data.design에 병합할 프론트 세션 보관값."""
 
@@ -74,6 +83,8 @@ class CrossSectionPatch(BaseModel):
     rock_boundary_offset_m: float | None = None
     # 측점별 표시 반폭(m) — 카드 개별 조절값. 전역 반폭과 다를 때만 실린다(2026-08-06).
     display_half_width_m: float | None = Field(default=None, gt=0)
+    inlet_structure: Literal["auto", "revet", "I", "L", "U"] | None = None
+    basin_adjust: BasinAdjustPatch | None = None
 
 
 class SectionConfirmRequest(BaseModel):
diff --git a/B06_Section/B06_Section_UI_Cross_Culvert.ts b/B06_Section/B06_Section_UI_Cross_Culvert.ts
index 82b29197..2afb5e50 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert.ts
@@ -254,8 +254,7 @@ export function appendCulvertOverlay(
       layer.append(cut);
     }
     if (basin.fillLine) {
-      // 구조물이 원지반 밖으로 나온 경우의 성토(되메움) 계획선 — 경사 5도(임시값,
-      // 2026-08-22 사용자 지정).
+      // 구조물이 원지반 밖으로 나온 경우의 성토(되메움) 계획선 — 성토 비탈 1:1.2.
       const fill = document.createElementNS(SVG_NS, "line");
       fill.setAttribute("x1", String(x(basin.fillLine.from.offset)));
       fill.setAttribute("y1", String(toDisplayY(basin.fillLine.from.elevation)));
@@ -266,7 +265,7 @@ export function appendCulvertOverlay(
       fillTitle.textContent =
         basin.shape === "I"
           ? "집수정(I형) 되메움(성토)선 — 관 하단에서 3도(계류 쪽 오름)로 원지반과 연결"
-          : `집수정(${shapeName}) 성토(되메움)선 — 구조물이 원지반 밖으로 나와 5° 경사로 채움`;
+          : `집수정(${shapeName}) 성토(되메움)선 — 구조물이 원지반 밖으로 나와 1:1.2로 채움`;
       fill.append(fillTitle);
       layer.append(fill);
     }
diff --git a/B06_Section/B06_Section_UI_Cross_Culvert_Basin.ts b/B06_Section/B06_Section_UI_Cross_Culvert_Basin.ts
index b5d44e57..2b8c21bb 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert_Basin.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert_Basin.ts
@@ -22,11 +22,50 @@ import {
 import { minShoulderWallOffset, slopeToeOffset } from "./B06_Section_UI_Cross_Culvert_Solve";
 import type {
   BasinLayout,
+  BasinAdjust,
   BasinShape,
   EndFace,
   OffsetPoint,
+  InletStructureChoice,
 } from "./B06_Section_UI_Cross_Culvert_Types";
 
+export function resolveBasinChoice(
+  choice: InletStructureChoice,
+  ruleReason: BasinLayout["reason"] | null,
+): { reason: BasinLayout["reason"] | null; shape: BasinShape } {
+  const selected = choice === "I" || choice === "L" || choice === "U";
+  return {
+    reason: choice === "revet" ? null : selected ? (ruleReason ?? "manual") : ruleReason,
+    shape: selected ? choice : "L",
+  };
+}
+
+export function basinApproachPoints(
+  edge: { offset_m: number; elevation_m: number },
+  outward: number,
+  adjust: BasinAdjust,
+  trim: OffsetPoint,
+): OffsetPoint[] | null {
+  // 접근선은 **설계선이 벽 상단까지 따라올 경로**다. 이 선을 주지 않으면 설계선이
+  // 자기 성토 물매(1:1.2)로 내려갔다가 트림 표고(벽 상단)로 되튀어 올라 급경사
+  // 선이 남는다(2026-08-22 사용자 지적). 좌우만 옮겨도 반드시 준다 — 집수정이
+  // 나간 만큼 노견이 수평으로 연장되는 것이 맞는 표현이다.
+  if (adjust.lateralM <= 1e-6 && adjust.slopeM <= 1e-6) return null;
+  const points: OffsetPoint[] = [{ offset: edge.offset_m, elevation: edge.elevation_m }];
+  if (adjust.lateralM > 1e-6) {
+    points.push({
+      offset: edge.offset_m + outward * adjust.lateralM,
+      elevation: edge.elevation_m,
+    });
+  }
+  // 중복 꼭짓점 제거 — 수평 선반 끝과 벽 상단이 겹치면 길이 0 구간이 남는다.
+  const last = points[points.length - 1];
+  if (Math.hypot(trim.offset - last.offset, trim.elevation - last.elevation) > 1e-6) {
+    points.push(trim);
+  }
+  return points.length >= 2 ? points : null;
+}
+
 /** 집수정 구성 입력 — 기하 본체가 자기 상태를 명시적으로 물려 준다. */
 export interface BasinBuildInput {
   /** 관 유입 기준점(노견 끝 offset, invert 표고 — ㄴ·ㄷ형은 상승분 반영 후). */
@@ -42,6 +81,7 @@ export interface BasinBuildInput {
   groundAt: (offset: number) => number;
   /** 표준단면 절토 경사(1:n) — 절토 계획선용. */
   cutSlopeRatio: number;
+  adjust: BasinAdjust;
 }
 
 /** 집수정 구성 결과 — 본체가 트림·관 끝단면·관 시작점에 나눠 꽂는다. */
@@ -58,21 +98,35 @@ export interface BasinBuildResult {
 
 /** 실무 내공 폭(m) — 울진 돌집수정. I형 관 시작점(노견+1.0m) 계산에도 쓴다. */
 export const BASIN_INNER_WIDTH_M = 1.0;
-const INNER_WIDTH_M = BASIN_INNER_WIDTH_M;
 
-/** 집수정 주변 성토(되메움) 표면 경사(도) — 2026-08-22 사용자 지정 "일단 5도". */
-const BASIN_FILL_ANGLE_DEG = 5;
+/** 집수정 주변 성토(되메움) 기울기(1:n) — 성토 비탈 기본 1:1.2. */
+const BASIN_FILL_SLOPE_RATIO = 1.2;
 
 /** 집수정 단면을 만든다. 형태별 규칙은 파일 머리말 참조. */
 export function buildBasin(input: BasinBuildInput): BasinBuildResult {
-  const { anchor, outward, shape, reason, diameterM, edge, groundAt, cutSlopeRatio } = input;
+  const {
+    anchor: baseAnchor,
+    outward,
+    shape,
+    reason,
+    diameterM,
+    edge,
+    groundAt,
+    cutSlopeRatio,
+    adjust,
+  } = input;
+  const movedAnchor = {
+    offset: baseAnchor.offset + outward * (adjust.lateralM + adjust.slopeM),
+    elevation: baseAnchor.elevation - adjust.slopeM / 1.2,
+  };
+  const anchor = movedAnchor;
   const memberT = BASIN_MEMBER_THICKNESS_M;
   const floorThickness = memberT;
   // 벽 높이: I형은 노견 접점까지 성장, ㄴ·ㄷ형은 내부 높이 1.2m 고정(임시값).
   const wallHeight =
     shape === "I"
       ? Math.max(diameterM + REVET_FREEBOARD_M, edge.elevation_m - anchor.elevation)
-      : BASIN_INNER_HEIGHT_M;
+      : adjust.innerHeightM;
   // 기움은 **수직 기준 반전** — 상단이 도로측(내공 쪽)으로 1:0.3 물러난다(2026-08-20).
   // bottomElevation을 내리면 면 기울기를 그대로 연장한다(I형 근입용).
   const defaultBottom = anchor.elevation - floorThickness;
@@ -112,6 +166,26 @@ export function buildBasin(input: BasinBuildInput): BasinBuildResult {
     { kind: "wall", points: wallOf(wallBase, outward, iWallBottom) },
   ];
   const iWallPoints = parts[0].points;
+  const iGroundIntersection = (): OffsetPoint => {
+    const low = iWallPoints[3];
+    const high = iWallPoints[2];
+    let lo = 0;
+    let hi = 1;
+    for (let pass = 0; pass < 32; pass += 1) {
+      const mid = (lo + hi) / 2;
+      const point = {
+        offset: low.offset + (high.offset - low.offset) * mid,
+        elevation: low.elevation + (high.elevation - low.elevation) * mid,
+      };
+      if (point.elevation < groundAt(point.offset)) lo = mid;
+      else hi = mid;
+    }
+    const t = (lo + hi) / 2;
+    return {
+      offset: low.offset + (high.offset - low.offset) * t,
+      elevation: low.elevation + (high.elevation - low.elevation) * t,
+    };
+  };
   // ㄴ형 = I형 + 바닥판. 바닥은 벽 바깥(계류측) 변에 맞대고 그 너머로 뻗는다
   // (2026-08-20 확정). 벽이 기울어 있어 안쪽 변도 벽 바깥면 선을 그대로 따른다.
   const wallOuterAt = (elevation: number): number => {
@@ -121,7 +195,7 @@ export function buildBasin(input: BasinBuildInput): BasinBuildResult {
   };
   const floorTopInner = wallOuterAt(anchor.elevation);
   const floorBottomInner = wallOuterAt(anchor.elevation - floorThickness);
-  const floorOuter = floorTopInner + outward * (INNER_WIDTH_M + memberT);
+  const floorOuter = floorTopInner + outward * (adjust.innerWidthM + memberT);
   const floorTaper = REVET_LEAN_RATIO * floorThickness;
   if (shape !== "I") {
     parts.push({
@@ -147,7 +221,7 @@ export function buildBasin(input: BasinBuildInput): BasinBuildResult {
   // 구조물 계류측 끝(ㄴ형 = 바닥 바깥 끝 상단, ㄷ형 = 막음벽 계류측 상단 꼭짓점)과
   // 원지반의 관계(2026-08-22 사용자 ①):
   //   · 원지반 안쪽에 박히면 → 표준단면 절토경사(1:n)로 **절토선**
-  //   · 원지반 밖으로 나오면 → **성토(되메움)선** — 경사 5도(임시값)로 지반까지.
+  //   · 원지반 밖으로 나오면 → **성토(되메움)선** — 1:1.2로 지반까지.
   let basinCut: BasinLayout["cutLine"] = null;
   let basinFill: BasinLayout["cutLine"] = null;
   if (shape !== "I") {
@@ -167,8 +241,11 @@ export function buildBasin(input: BasinBuildInput): BasinBuildResult {
           break;
         }
       }
-    } else if (groundHere < refTop.elevation - 0.05) {
-      const dropPerM = Math.tan((BASIN_FILL_ANGLE_DEG * Math.PI) / 180);
+    } else if (
+      groundHere < refTop.elevation - 0.05 &&
+      !(adjust.lateralM > 1e-6 && adjust.slopeM <= 1e-6)
+    ) {
+      const dropPerM = 1 / BASIN_FILL_SLOPE_RATIO;
       for (let run = 0.05; run <= 30; run += 0.05) {
         const probe = refTop.offset + outward * run;
         const elevation = refTop.elevation - dropPerM * run;
@@ -203,7 +280,7 @@ export function buildBasin(input: BasinBuildInput): BasinBuildResult {
     },
     pipeEnd:
       shape === "I"
-        ? { offset: anchor.offset + outward * INNER_WIDTH_M, elevation: anchor.elevation }
+        ? iGroundIntersection()
         : { offset: floorTopInner, elevation: anchor.elevation },
     trimOffset: wallBase - outward * REVET_LEAN_RATIO * wallHeight,
     trimElevation: anchor.elevation + wallHeight,
@@ -248,6 +325,12 @@ export function inletChoiceAvailability(input: {
     edge,
     groundAt,
     cutSlopeRatio: input.cutSlopeRatio,
+    adjust: {
+      innerWidthM: BASIN_INNER_WIDTH_M,
+      innerHeightM: BASIN_INNER_HEIGHT_M,
+      lateralM: 0,
+      slopeM: 0,
+    },
   });
   return { revetAllowed, basinLUAllowed: probe.basin.cutLine != null, revetAutoOffset };
 }
diff --git a/B06_Section/B06_Section_UI_Cross_Culvert_Const.ts b/B06_Section/B06_Section_UI_Cross_Culvert_Const.ts
index a528988b..00177d39 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert_Const.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert_Const.ts
@@ -88,8 +88,8 @@ export function revetHeightLimit(form: string | null | undefined): number {
 
 /* ── 기슭막이 재질·높이 조작(2026-08-22 사용자 확정) ─────────────────────
  * 높이 조작이 교본 형태별 한계와 부딪히면 **재질을 바꿔야** 더 올릴 수 있다:
- * 메쌓기 2.0 / 찰쌓기 3.0(돌쌓기.md §1) / 콘크리트 5.0(임시 — 사용자 지정
- * "일단 5m", 흙막이.md 산복기초 4.0과 다름·확정 시 교체). 높이 기준은 근입
+ * 메쌓기 2.0 / 찰쌓기 3.0(돌쌓기.md §1) / 콘크리트 5.0(프로젝트 기본값,
+ * 외부 기준 미확인). 높이 기준은 근입
  * 0.5m 위 기준선(관 invert 자리)~상단의 **계산용 높이**로 종전과 동일. */
 export type RevetMaterial = "dry" | "wet" | "concrete";
 
@@ -118,7 +118,7 @@ export const PIPE_CONNECT_GRADE = Math.tan((3 * Math.PI) / 180);
 export const PIPE_WALL_MIN_HEIGHT_M = 2.0;
 /** 배관 기슭막이 기본 높이(m) — 재질과 무관하게 2.0(2026-08-22 사용자 정정). */
 export const PIPE_WALL_DEFAULT_HEIGHT_M = 2.0;
-/** 일반(추가) 기슭막이 높이 조작 하한(m). */
+/** 일반(추가) 기슭막이 높이 조작 하한(m) — 프로젝트 기본값 0.5m. */
 export const EXTRA_WALL_MIN_HEIGHT_M = 0.5;
 /** 일반(추가) 기슭막이 기본 높이(m). */
 export const EXTRA_WALL_DEFAULT_HEIGHT_M = 1.5;
@@ -161,7 +161,7 @@ export const BASIN_BOTTOM_CLEARANCE_M = 0.5;
 
 /**
  * 집수정 내부 높이(m) — 바닥판이 있는 ㄴ(L)·ㄷ형의 **바닥 윗면~벽 상단** 깊이.
- * ⚠ 임시 설정값 1.2(2026-08-22 사용자 지정 "일단 1.2로") — 근거 확정 시 교체.
+ * 프로젝트 기본값 1.2m(2026-08-22 사용자 확정). 외부 기준은 확인되지 않았다.
  * I형(공유벽뿐)은 이 값을 쓰지 않고 노견 끝 접점까지 벽을 키운다.
  */
 export const BASIN_INNER_HEIGHT_M = 1.2;
diff --git a/B06_Section/B06_Section_UI_Cross_Culvert_Geom.ts b/B06_Section/B06_Section_UI_Cross_Culvert_Geom.ts
index 33aed366..644b65db 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert_Geom.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert_Geom.ts
@@ -10,7 +10,6 @@
 
 import type { CrossSection, CulvertSideSpec, SectionSample } from "./B06_Section_Api_Fetch";
 import {
-  BASIN_INNER_HEIGHT_M,
   BASIN_MAX_FILL_SLOPE_M,
   FILL_MIN_RISE_M,
   materialFromForm,
@@ -32,7 +31,7 @@ import type { RevetMaterial } from "./B06_Section_UI_Cross_Culvert_Const";
 import { ZERO_ADJUST } from "./B06_Section_UI_Cross_Culvert_Types";
 import type {
   BasinLayout,
-  BasinShape,
+  BasinAdjust,
   CulvertLayout,
   EndFace,
   InletStructureChoice,
@@ -41,6 +40,7 @@ import type {
   WallAdjust,
   WallLayout,
 } from "./B06_Section_UI_Cross_Culvert_Types";
+import { DEFAULT_BASIN_ADJUST } from "./B06_Section_UI_Cross_Culvert_Types";
 
 // 상수·자료형은 분리 파일에 있고, 기존 import 경로를 유지하기 위해 그대로 다시 내보낸다.
 export * from "./B06_Section_UI_Cross_Culvert_Const";
@@ -48,9 +48,11 @@ export * from "./B06_Section_UI_Cross_Culvert_Types";
 
 import {
   applyBasinPipeFill,
+  basinApproachPoints,
   BASIN_INNER_WIDTH_M,
   buildBasin,
   inletChoiceAvailability,
+  resolveBasinChoice,
 } from "./B06_Section_UI_Cross_Culvert_Basin";
 import { buildOutletExtras, inletGroundConnector } from "./B06_Section_UI_Cross_Culvert_Extra";
 import type { FillSlopeSegment, WallVertical } from "./B06_Section_UI_Cross_Culvert_Solve";
@@ -76,9 +78,8 @@ export function computeCulvertLayout(
   groundSamples: SectionSample[],
   /** 사용자 조작값(좌우 x·상하 d·높이 h·재질 m — 2026-08-22 4축). 없으면 자동. */
   revetShift?: { inlet?: WallAdjust; outlet?: WallAdjust; extras?: WallAdjust[] },
-  /** 유입측 구조물 형식 선택(드롭다운) — 없으면 auto(규칙). */
   inletStructure?: InletStructureChoice,
-  /** 다단 등간격 배치 1회성 트리거(2026-08-22 사용자 ①). */
+  basinAdjustment?: BasinAdjust,
   equalizeExtras?: boolean,
 ): CulvertLayout | null {
   const culvert = section.culvert;
@@ -92,6 +93,7 @@ export function computeCulvertLayout(
   const minSample = Math.min(...sampleOffsets);
   const maxSample = Math.max(...sampleOffsets);
   if (!(maxSample > minSample)) return null;
+  const basinAdjust = basinAdjustment ?? DEFAULT_BASIN_ADJUST;
 
   // 좌표 규약: +offset = 좌측. 상단측 = 유입(미상이면 좌측 폴백).
   const uphill = section.uphill_side ?? "left";
@@ -132,24 +134,16 @@ export function computeCulvertLayout(
       : inletFillSlopeLen <= BASIN_MAX_FILL_SLOPE_M + 1e-6
         ? "short"
         : null;
-  // 사용자 선택(드롭다운 — 2026-08-22)이 규칙보다 우선한다:
-  //   revet = 기슭막이+배관 강제(양측성토 로직), I/L/U = 해당 형식 집수정 강제.
   const choice: InletStructureChoice = inletStructure ?? "auto";
-  const basinReason: BasinLayout["reason"] | null =
-    choice === "revet"
-      ? null
-      : choice === "I" || choice === "L" || choice === "U"
-        ? (ruleReason ?? "manual")
-        : ruleReason;
-  // 집수정 형식 기본값 = ㄴ(L)형(2026-08-20 확정) — 선택 시 그 형식.
-  const basinShape: BasinShape = choice === "I" || choice === "L" || choice === "U" ? choice : "L";
+  const { reason: basinReason, shape: basinShape } = resolveBasinChoice(choice, ruleReason);
   // ㄴ·ㄷ형은 사이즈 유지한 채 통째로 노견 끝점 일치(2026-08-22 확정) — 바닥(=관
   // 유입 invert)이 따라 올라 물매도 바뀐다. I형은 원지반 배관 유지(상세 Basin 참조).
   if (basinReason && basinShape !== "I") {
-    inlet.elevation = inletInfo.edge.elevation_m - BASIN_INNER_HEIGHT_M;
+    inlet.elevation = inletInfo.edge.elevation_m - basinAdjust.innerHeightM;
   } else if (basinReason) {
     // I형 — 관 시작점(내공 1.0m 자리) invert = 그 x의 원지반(토피 상한 이내).
-    const startOffset = inlet.offset + inletInfo.outward * BASIN_INNER_WIDTH_M;
+    const startOffset =
+      inlet.offset + inletInfo.outward * (BASIN_INNER_WIDTH_M + basinAdjust.lateralM);
     inlet.elevation = Math.min(groundAt(startOffset), invertCap(inletInfo.edge));
   }
 
@@ -305,6 +299,7 @@ export function computeCulvertLayout(
         edge: spec.role === "inlet" ? inletInfo.edge : outletInfo.edge,
         groundAt,
         cutSlopeRatio: section.design?.cut_slope_ratio ?? 1.0,
+        adjust: basinAdjust,
       });
       basin = built.basin;
       basinPipeEnd = built.pipeEnd;
@@ -317,6 +312,14 @@ export function computeCulvertLayout(
         trimMin = built.trimOffset;
         trimMinElevation = built.trimElevation;
       }
+      const points = basinApproachPoints(inletInfo.edge, outward, basinAdjust, {
+        offset: built.trimOffset,
+        elevation: built.trimElevation,
+      });
+      if (points) {
+        if (outward > 0) trimMaxSlope = { points };
+        else trimMinSlope = { points };
+      }
       return null;
     }
     // 형상(사용자 스케치 확정 — 좌측 벽 기준, 우측은 반전): 배면(도로측) 수직, 전면
@@ -611,7 +614,7 @@ export function computeCulvertLayout(
   }
 
   // I형 집수정: 관 하단 꼭짓점이 지반 위에 뜨면 수평 되메움선(Basin 분리 — 700줄).
-  if (basin) {
+  if (basin && !(basinAdjust.lateralM > 1e-6 && basinAdjust.slopeM <= 1e-6)) {
     applyBasinPipeFill(basin, pipeCorners.inlet.bottom, inletInfo.outward, groundAt);
   }
   // 유입 기슭막이의 관 시작 접속선(2026-08-22 ②) — 위 0도 성토선 / 아래 0도 1m+절토선.
diff --git a/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts b/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts
index cc4dae12..13747f58 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts
@@ -105,6 +105,21 @@ export interface BasinLayout {
   fillLine: { from: OffsetPoint; to: OffsetPoint } | null;
 }
 
+/** 측점별 집수정 조정값. 위치값은 기본 배치 기준이며 +는 계류측/사면 아래 방향이다. */
+export interface BasinAdjust {
+  innerWidthM: number;
+  innerHeightM: number;
+  lateralM: number;
+  slopeM: number;
+}
+
+export const DEFAULT_BASIN_ADJUST: BasinAdjust = {
+  innerWidthM: 1.0,
+  innerHeightM: 1.2,
+  lateralM: 0,
+  slopeM: 0,
+};
+
 /** 관 끝단을 자를 마감면 — 구조물(기슭막이·집수정)의 계류측 변을 **그대로 복사**한다. */
 export interface EndFace {
   base: OffsetPoint;
diff --git a/B06_Section/B06_Section_UI_Cross_Culvert_Wire.ts b/B06_Section/B06_Section_UI_Cross_Culvert_Wire.ts
index d1cdc1ea..4edac236 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert_Wire.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert_Wire.ts
@@ -7,6 +7,7 @@
 import type { CrossSection, SectionSample } from "./B06_Section_Api_Fetch";
 import { computeCulvertLayout } from "./B06_Section_UI_Cross_Culvert";
 import type { CulvertLayout, InletStructureChoice, RevetKey } from "./B06_Section_UI_Cross_Culvert";
+import type { BasinAdjust } from "./B06_Section_UI_Cross_Culvert_Types";
 import { materialLabel, materialLimit } from "./B06_Section_UI_Cross_Culvert_Const";
 import type { WallAdjust } from "./B06_Section_UI_Cross_Culvert_Types";
 import {
@@ -33,7 +34,10 @@ export interface RevetOffsetControl {
 /** 유입측 구조물 형식 선택(드롭다운 — 2026-08-22 사용자). 세션 보관은 Page가 한다. */
 export interface InletStructureControl {
   valueFor: (section: CrossSection) => InletStructureChoice;
+  adjustFor: (section: CrossSection) => BasinAdjust;
   set: (chainageM: number, value: InletStructureChoice) => void;
+  updateAdjust: (chainageM: number, patch: Partial<BasinAdjust>) => void;
+  resetAdjust: (chainageM: number) => void;
 }
 
 /** 유출측 다단 기슭막이 단 수 제어(2026-08-22 사용자 — 유출 벽 기준 숫자 입력). */
@@ -77,6 +81,7 @@ export function computeCardCulvert(
     sourceSamples,
     adjustsInput(section, revetOffset, extraWalls),
     inletStructure?.valueFor(section),
+    inletStructure?.adjustFor(section),
     equalizeExtras,
   );
   if (!layout) return null;
diff --git a/B06_Section/B06_Section_UI_Cross_Design.ts b/B06_Section/B06_Section_UI_Cross_Design.ts
index fa40b843..6e0349aa 100644
--- a/B06_Section/B06_Section_UI_Cross_Design.ts
+++ b/B06_Section/B06_Section_UI_Cross_Design.ts
@@ -543,8 +543,22 @@ export function appendCrossDesignOverlay(
     | [{ offset_m: number; elevation_m: number }, { offset_m: number; elevation_m: number }]
     | null => {
     // 배수관 세트 트림 + 사면 끝 접점 트림을 합친 유효 범위.
-    const minOffset = Math.max(trim?.minOffset ?? -Infinity, meetLeft ?? -Infinity);
-    const maxOffset = Math.min(trim?.maxOffset ?? Infinity, meetRight ?? Infinity);
+    // 배수관 레이아웃이 사면 폴리라인(min/maxSlope)을 준 쪽은 **그 시작점(노견)에서**
+    // 설계선을 끊는다 — 그 바깥은 폴리라인이 그리므로 이중선이 되고, 트림 경계에서
+    // 표고를 벽 상단으로 스냅하면서 수직으로 튀는 선이 남는다(2026-08-22 사용자 지적:
+    // 집수정을 좌우로 옮기면 벽 상단이 노견 표고 그대로라 스냅 폭이 그만큼 커진다).
+    const minSlopeStart = trim?.minSlope?.points[0]?.offset;
+    const maxSlopeStart = trim?.maxSlope?.points[0]?.offset;
+    const minOffset = Math.max(
+      trim?.minOffset ?? -Infinity,
+      meetLeft ?? -Infinity,
+      minSlopeStart ?? -Infinity,
+    );
+    const maxOffset = Math.min(
+      trim?.maxOffset ?? Infinity,
+      meetRight ?? Infinity,
+      maxSlopeStart ?? Infinity,
+    );
     if (!Number.isFinite(minOffset) && !Number.isFinite(maxOffset)) return [a, b];
     const effective = { minOffset, maxOffset };
     const lo = Math.min(a.offset_m, b.offset_m);
diff --git a/B06_Section/B06_Section_UI_Cross_Structure_Panel.ts b/B06_Section/B06_Section_UI_Cross_Structure_Panel.ts
index 054a11ff..06c85315 100644
--- a/B06_Section/B06_Section_UI_Cross_Structure_Panel.ts
+++ b/B06_Section/B06_Section_UI_Cross_Structure_Panel.ts
@@ -13,7 +13,7 @@
 import type { InletStructureChoice, RevetKey } from "./B06_Section_UI_Cross_Culvert";
 import { materialLimit, REVET_MATERIALS } from "./B06_Section_UI_Cross_Culvert_Const";
 import type { RevetMaterial } from "./B06_Section_UI_Cross_Culvert_Const";
-import type { WallAdjust } from "./B06_Section_UI_Cross_Culvert_Types";
+import type { BasinAdjust, WallAdjust } from "./B06_Section_UI_Cross_Culvert_Types";
 import { L } from "./B06_Section_UI_Section_Common";
 
 /** 조정창이 쓰는 값·동작. 카드가 자기 상태에 맞춰 물려 준다. */
@@ -40,6 +40,9 @@ export interface StructurePanelDeps {
   structureFor: () => InletStructureChoice;
   /** 유입측 구조물 형식 변경 — 카드를 다시 그린다. */
   setStructure: (value: InletStructureChoice) => void;
+  basinAdjustFor: () => BasinAdjust;
+  updateBasin: (patch: Partial<BasinAdjust>) => void;
+  resetBasin: () => void;
   /** 이동 조작 가능 여부 — 집수정(자리 고정)은 숨긴다. */
   canNudge: (key: RevetKey) => boolean;
   /** 상황에 안 맞는 선택지 숨김(2026-08-22 사용자) — 기하가 판정한 가용성. */
@@ -64,6 +67,7 @@ export interface StructurePanelHandle {
  */
 const STEP_M = 1.0;
 const HEIGHT_STEP_M = 0.1;
+const BASIN_STEP_M = 0.1;
 
 function makeButton(label: string, title: string, onClick: () => void): HTMLButtonElement {
   const button = document.createElement("button");
@@ -227,6 +231,45 @@ export function buildStructurePanel(deps: StructurePanelDeps): StructurePanelHan
   });
   structureParts.controls.append(select);
 
+  const basinRow = makeRow("집수정 크기·위치");
+  basinRow.controls.classList.add("b06-structure-panel__basin-buttons");
+  const basinButton = (label: string, titleText: string, patch: () => Partial<BasinAdjust>) =>
+    makeButton(label, titleText, () => deps.updateBasin(patch()));
+  const basinHeightUp = basinButton("높이＋", "내부 높이 +0.1m", () => ({
+    innerHeightM: Math.min(2, deps.basinAdjustFor().innerHeightM + BASIN_STEP_M),
+  }));
+  const basinHeightDown = basinButton("높이－", "내부 높이 -0.1m", () => ({
+    innerHeightM: Math.max(1, deps.basinAdjustFor().innerHeightM - BASIN_STEP_M),
+  }));
+  const basinWidthDown = basinButton("폭－", "내부 폭 -0.1m", () => ({
+    innerWidthM: Math.max(1, deps.basinAdjustFor().innerWidthM - BASIN_STEP_M),
+  }));
+  const basinWidthUp = basinButton("폭＋", "내부 폭 +0.1m", () => ({
+    innerWidthM: Math.min(2, deps.basinAdjustFor().innerWidthM + BASIN_STEP_M),
+  }));
+  const basinSlopeUp = basinButton("사면▲", "1:1.2 성토선을 따라 위로", () => ({
+    slopeM: Math.max(0, deps.basinAdjustFor().slopeM - BASIN_STEP_M),
+  }));
+  const basinSlopeDown = basinButton("사면▼", "1:1.2 성토선을 따라 아래로", () => ({
+    slopeM: deps.basinAdjustFor().slopeM + BASIN_STEP_M,
+  }));
+  const basinIn = basinButton("노견◀", "노견측으로 0.1m", () => ({
+    lateralM: Math.max(0, deps.basinAdjustFor().lateralM - BASIN_STEP_M),
+  }));
+  const basinOut = basinButton("바깥▶", "노견 반대측으로 0.1m", () => ({
+    lateralM: deps.basinAdjustFor().lateralM + BASIN_STEP_M,
+  }));
+  basinRow.controls.append(
+    basinHeightUp,
+    basinHeightDown,
+    basinWidthDown,
+    basinWidthUp,
+    basinSlopeUp,
+    basinSlopeDown,
+    basinIn,
+    basinOut,
+  );
+
   // 다단 기슭막이 단 수(2026-08-22 사용자) — 높이 행과 같은 형식(－ 값 ＋),
   // 직접 입력 없음. 현재 단 수는 show()가 채운다.
   const extraParts = makeRow(L("B06_Cross_Extra_Count"));
@@ -248,8 +291,19 @@ export function buildStructurePanel(deps: StructurePanelDeps): StructurePanelHan
 
   const head = document.createElement("div");
   head.className = "b06-structure-panel__head";
-  head.append(title, closeButton);
-  root.append(head, value, structureRow, materialRow, heightRow, extraRow, moveRow.row);
+  const basinReset = makeButton("↺", "집수정 기본값", () => deps.resetBasin());
+  basinReset.classList.add("b06-structure-panel__basin-reset");
+  head.append(title, basinReset, closeButton);
+  root.append(
+    head,
+    value,
+    structureRow,
+    basinRow.row,
+    materialRow,
+    heightRow,
+    extraRow,
+    moveRow.row,
+  );
 
   return {
     root,
@@ -259,6 +313,9 @@ export function buildStructurePanel(deps: StructurePanelDeps): StructurePanelHan
       if (!key) return;
       const isExtra = key.startsWith("extra");
       const movable = deps.canNudge(key);
+      const structure = deps.structureFor();
+      const isBasin =
+        key === "inlet" && (structure === "I" || structure === "L" || structure === "U");
       title.textContent = isExtra
         ? `${L("B06_Cross_Revet_Extra")} ${Number(key.slice(5)) + 1}`
         : key === "outlet"
@@ -269,7 +326,6 @@ export function buildStructurePanel(deps: StructurePanelDeps): StructurePanelHan
       // 형식 선택은 유입측에서만, 이동·높이 조작은 기슭막이(집수정 제외)만.
       structureRow.classList.toggle("is-hidden", key !== "inlet");
       if (key === "inlet") {
-        const structure = deps.structureFor();
         // 상황에 안 맞는 선택지는 숨긴다(2026-08-22 사용자). 단 지금 선택된 값은
         // 남긴다 — 숨기면 셀렉트가 빈 값이 된다.
         const allow = deps.optionsFor();
@@ -283,6 +339,12 @@ export function buildStructurePanel(deps: StructurePanelDeps): StructurePanelHan
         select.value = structure;
       }
       moveRow.row.classList.toggle("is-hidden", !movable);
+      basinRow.row.classList.toggle("is-hidden", !isBasin);
+      basinReset.classList.toggle("is-hidden", !isBasin);
+      const isI = structure === "I";
+      for (const button of [basinHeightUp, basinHeightDown, basinWidthDown, basinWidthUp]) {
+        button.classList.toggle("is-hidden", isI);
+      }
       materialRow.classList.toggle("is-hidden", !movable);
       heightRow.classList.toggle("is-hidden", !movable);
       if (movable) {
diff --git a/B06_Section/B06_Section_UI_Cross_View.ts b/B06_Section/B06_Section_UI_Cross_View.ts
index bb4f9db7..a0b97ff1 100644
--- a/B06_Section/B06_Section_UI_Cross_View.ts
+++ b/B06_Section/B06_Section_UI_Cross_View.ts
@@ -550,6 +550,19 @@ export function createCrossSectionCard(
       },
       structureFor: () => inletStructure?.valueFor(section) ?? "auto",
       setStructure: (value) => inletStructure?.set(section.chainage_m, value),
+      basinAdjustFor: () =>
+        inletStructure?.adjustFor(section) ?? {
+          innerWidthM: 1,
+          innerHeightM: 1.2,
+          lateralM: 0,
+          slopeM: 0,
+        },
+      updateBasin: (patch) =>
+        inletStructure?.updateAdjust(section.chainage_m, {
+          ...inletStructure.adjustFor(section),
+          ...patch,
+        }),
+      resetBasin: () => inletStructure?.resetAdjust(section.chainage_m),
       // 집수정은 자리 고정 — 유입이 집수정이면 ◀/▶/↺를 숨긴다(추가 벽은 항상 이동).
       canNudge: (key) => key !== "inlet" || !culvertInletIsBasin,
       optionsFor: () => culvertInletOptions,
diff --git a/B06_Section/B06_Section_UI_Page.ts b/B06_Section/B06_Section_UI_Page.ts
index d274b946..c9fd8f79 100644
--- a/B06_Section/B06_Section_UI_Page.ts
+++ b/B06_Section/B06_Section_UI_Page.ts
@@ -151,7 +151,11 @@ export async function renderB06ProfileCross(root: HTMLElement): Promise<void> {
         standard_cross_section: standardPanel?.getValues(),
       });
       if (designRequestSeq.get(chainageM) !== seq) return;
-      target.design = response.design;
+      target.design = {
+        ...response.design,
+        inlet_structure: target.design?.inlet_structure,
+        basin_adjust: target.design?.basin_adjust,
+      };
       sectionView.refreshCard(chainageM);
     } catch (error) {
       if (designRequestSeq.get(chainageM) !== seq) return;
@@ -236,7 +240,11 @@ export async function renderB06ProfileCross(root: HTMLElement): Promise<void> {
         const next = designByChainage.get(section.chainage_m.toFixed(3));
         if (next) {
           // full_designs 응답은 설계 전체(설계선 좌표 포함)라 통째로 교체한다.
-          section.design = next as typeof section.design;
+          section.design = {
+            ...(next as NonNullable<typeof section.design>),
+            inlet_structure: section.design?.inlet_structure,
+            basin_adjust: section.design?.basin_adjust,
+          };
           sectionView.refreshCard(section.chainage_m);
         }
       }
@@ -387,6 +395,8 @@ export async function renderB06ProfileCross(root: HTMLElement): Promise<void> {
   const stationWidthControl = stationControls.stationWidth;
   const revetOffsetControl = stationControls.revetOffset;
   const stationWidths = stationControls.widths;
+  const inletStructures = stationControls.inletStructures;
+  const basinAdjustments = stationControls.basinAdjustments;
 
   const sectionView = createSectionView(
     (chainageM, change) => {
@@ -491,6 +501,12 @@ export async function renderB06ProfileCross(root: HTMLElement): Promise<void> {
     stationWidths.forEach((width, chainage) => {
       patchFor(Number(chainage)).display_half_width_m = width;
     });
+    inletStructures.forEach((structure, chainage) => {
+      patchFor(Number(chainage)).inlet_structure = structure;
+    });
+    basinAdjustments.forEach((adjust, chainage) => {
+      patchFor(Number(chainage)).basin_adjust = adjust;
+    });
     const crossPatches: CrossSectionPatch[] = [...patchByChainage.values()];
     // 유토곡선은 화면 표시 내내 프론트 메모리에만 있다가 저장 시점에만 영구 저장된다.
     const result =
diff --git a/B06_Section/B06_Section_UI_Page_Station_Controls.ts b/B06_Section/B06_Section_UI_Page_Station_Controls.ts
index 5276dd7b..28e8ff2c 100644
--- a/B06_Section/B06_Section_UI_Page_Station_Controls.ts
+++ b/B06_Section/B06_Section_UI_Page_Station_Controls.ts
@@ -7,8 +7,8 @@
 
 import type { SectionDetailResponse } from "./B06_Section_Api_Fetch";
 import type { InletStructureChoice, RevetKey } from "./B06_Section_UI_Cross_Culvert";
-import { ZERO_ADJUST } from "./B06_Section_UI_Cross_Culvert_Types";
-import type { WallAdjust } from "./B06_Section_UI_Cross_Culvert_Types";
+import { DEFAULT_BASIN_ADJUST, ZERO_ADJUST } from "./B06_Section_UI_Cross_Culvert_Types";
+import type { BasinAdjust, WallAdjust } from "./B06_Section_UI_Cross_Culvert_Types";
 import type {
   ExtraWallControl,
   InletStructureControl,
@@ -18,7 +18,9 @@ import type {
 
 /** 제어가 페이지에서 가져다 쓰는 값들 — 클로저 대신 함수로 받아 결합을 끊는다. */
 export interface StationControlDeps {
-  sessionKey: (kind: "crossw" | "revetx" | "inletstruct" | "extrawall") => string | null;
+  sessionKey: (
+    kind: "crossw" | "revetx" | "inletstruct" | "basinadjust" | "extrawall",
+  ) => string | null;
   refreshCard: (chainageM: number) => void;
   detail: () => SectionDetailResponse | null;
   crossHalfWidth: () => number | undefined;
@@ -32,6 +34,8 @@ export interface StationControls {
   inletStructure: InletStructureControl;
   extraWalls: ExtraWallControl;
   widths: Map<string, number>;
+  inletStructures: Map<string, InletStructureChoice>;
+  basinAdjustments: Map<string, BasinAdjust>;
   load: () => void;
   /** 전체 반영 — 개별 반폭을 전역값으로 덮는다(없으면 비운다). */
   applyGlobalWidth: (requested: number | undefined, chainages: number[]) => void;
@@ -201,7 +205,32 @@ export function createStationControls(deps: StationControlDeps): StationControls
   /* ── 유입측 구조물 형식(2026-08-22 사용자 — 드롭다운) ────────────────
    * auto(규칙)/revet(기슭막이+배관)/I/L/U(집수정 형식). 세션에만 담는다. */
   const inletStructures = new Map<string, InletStructureChoice>();
+  const basinAdjustments = new Map<string, BasinAdjust>();
   const structSessionKey = (): string | null => deps.sessionKey("inletstruct");
+  const basinSessionKey = (): string | null => deps.sessionKey("basinadjust");
+
+  function loadBasinAdjustments(): void {
+    basinAdjustments.clear();
+    const key = basinSessionKey();
+    if (!key) return;
+    try {
+      const parsed = JSON.parse(window.sessionStorage.getItem(key) ?? "{}") as Record<
+        string,
+        BasinAdjust
+      >;
+      Object.entries(parsed).forEach(([chainage, value]) =>
+        basinAdjustments.set(chainage, { ...DEFAULT_BASIN_ADJUST, ...value }),
+      );
+    } catch {
+      /* 손상된 세션 값은 기본값으로 대체. */
+    }
+  }
+
+  function persistBasinAdjustments(): void {
+    const key = basinSessionKey();
+    if (key)
+      window.sessionStorage.setItem(key, JSON.stringify(Object.fromEntries(basinAdjustments)));
+  }
 
   function loadInletStructures(): void {
     inletStructures.clear();
@@ -300,13 +329,38 @@ export function createStationControls(deps: StationControlDeps): StationControls
   };
 
   const inletStructureControl: InletStructureControl = {
-    valueFor: (section) => inletStructures.get(section.chainage_m.toFixed(2)) ?? "auto",
+    valueFor: (section) =>
+      inletStructures.get(section.chainage_m.toFixed(2)) ??
+      section.design?.inlet_structure ??
+      "auto",
+    adjustFor: (section) =>
+      basinAdjustments.get(section.chainage_m.toFixed(2)) ?? {
+        ...DEFAULT_BASIN_ADJUST,
+        ...(section.design?.basin_adjust ?? {}),
+      },
     set: (chainageM, value) => {
-      if (value === "auto") inletStructures.delete(chainageM.toFixed(2));
-      else inletStructures.set(chainageM.toFixed(2), value);
+      inletStructures.set(chainageM.toFixed(2), value);
       persistInletStructures();
       deps.refreshCard(chainageM);
     },
+    updateAdjust: (chainageM, patch) => {
+      const key = chainageM.toFixed(2);
+      const current = basinAdjustments.get(key) ?? { ...DEFAULT_BASIN_ADJUST };
+      const next = { ...current, ...patch };
+      basinAdjustments.set(key, {
+        innerWidthM: Math.min(2, Math.max(1, round1(next.innerWidthM))),
+        innerHeightM: Math.min(2, Math.max(1, round1(next.innerHeightM))),
+        lateralM: Math.max(0, clampMove(next.lateralM)),
+        slopeM: Math.max(0, clampMove(next.slopeM)),
+      });
+      persistBasinAdjustments();
+      deps.refreshCard(chainageM);
+    },
+    resetAdjust: (chainageM) => {
+      basinAdjustments.set(chainageM.toFixed(2), { ...DEFAULT_BASIN_ADJUST });
+      persistBasinAdjustments();
+      deps.refreshCard(chainageM);
+    },
   };
 
   return {
@@ -315,10 +369,13 @@ export function createStationControls(deps: StationControlDeps): StationControls
     inletStructure: inletStructureControl,
     extraWalls: extraWallControl,
     widths: stationWidths,
+    inletStructures,
+    basinAdjustments,
     load: () => {
       loadStationWidths();
       loadRevetShifts();
       loadInletStructures();
+      loadBasinAdjustments();
       loadExtraCounts();
     },
     applyGlobalWidth: (requested, chainages) => {
diff --git a/B06_Section/B06_Section_UI_Style_Cross_Controls.css b/B06_Section/B06_Section_UI_Style_Cross_Controls.css
index 980bc6df..ac477bed 100644
--- a/B06_Section/B06_Section_UI_Style_Cross_Controls.css
+++ b/B06_Section/B06_Section_UI_Style_Cross_Controls.css
@@ -107,6 +107,16 @@
   gap: 2px;
 }
 
+.b06-structure-panel__basin-buttons {
+  display: grid;
+  grid-template-columns: repeat(4, max-content);
+  gap: 2px;
+}
+
+.b06-structure-panel__basin-reset {
+  margin-left: auto;
+}
+
 .b06-structure-panel__select {
   flex: 1;
   padding: 1px var(--spacing-4);