diff --git a/B06_Section/B06_Section_UI_Cross_Culvert.ts b/B06_Section/B06_Section_UI_Cross_Culvert.ts
index 6f74b9983..640890541 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert.ts
@@ -21,6 +21,7 @@ import type {
   PipeEnd,
   WallLayout,
 } from "./B06_Section_UI_Cross_Culvert_Geom";
+import { outlineBox } from "./B06_Section_UI_Cross_Culvert_Types";
 import { appendWallTrench, foundationChoice } from "./B06_Section_UI_Cross_Excavation";
 import {
   appendChuteBand,
@@ -371,20 +372,21 @@ export function appendCulvertOverlay(
       layer.append(hit);
     }
     // 집수정도 선택 대상(2026-08-22 사용자 — 형식 드롭다운). 자리 이동은 없고
-    // 조정창에서 구조물 형식만 고른다.
-    if (layout.basin) {
-      for (const part of layout.basin.parts) {
-        const hit = polygon(
-          part.points.map((p) => [x(p.offset), toDisplayY(p.elevation)] as [number, number]),
-          "b06-chart__culvert-revet-hit",
-          "유입 집수정 선택 — 조정창에서 구조물 형식 선택",
-        );
-        hit.addEventListener("click", (event) => {
-          event.stopPropagation();
-          onSelectRevet("inlet");
-        });
-        layer.append(hit);
-      }
+    // 조정창에서 구조물 형식만 고른다. 판정면 = 부재 전체를 감싸는 가상 사각형(190-1 · 세월교 측벽 꼴).
+    const basinPoints = layout.basin?.parts.flatMap((part) => part.points) ?? [];
+    if (basinPoints.length) {
+      const hit = polygon(
+        outlineBox(basinPoints).map(
+          (p) => [x(p.offset), toDisplayY(p.elevation)] as [number, number],
+        ),
+        "b06-chart__culvert-revet-hit",
+        "유입 집수정 선택 — 조정창에서 구조물 형식 선택",
+      );
+      hit.addEventListener("click", (event) => {
+        event.stopPropagation();
+        onSelectRevet("inlet");
+      });
+      layer.append(hit);
     }
   }
 
diff --git a/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts b/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts
index 56c2499c6..94dc53ea0 100644
--- a/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts
+++ b/B06_Section/B06_Section_UI_Cross_Culvert_Types.ts
@@ -36,6 +36,20 @@ export interface OffsetPoint {
   elevation: number;
 }
 
+/** 점들을 감싸는 가상 사각형 — 고르기 판정면만(그림 아님) · 세월교 측벽 ㄴ(79-6) · 집수정(190-1). */
+export function outlineBox(points: OffsetPoint[]): OffsetPoint[] {
+  const offsets = points.map((point) => point.offset);
+  const elevations = points.map((point) => point.elevation);
+  const [left, right] = [Math.max(...offsets), Math.min(...offsets)];
+  const [top, bottom] = [Math.max(...elevations), Math.min(...elevations)];
+  return [
+    { offset: left, elevation: top },
+    { offset: right, elevation: top },
+    { offset: right, elevation: bottom },
+    { offset: left, elevation: bottom },
+  ];
+}
+
 /** 설계선(성토 경사) 트림 범위 — 이 밖은 벽·보호공이 대신하므로 그리지 않는다. */
 export interface CulvertDesignTrim {
   minOffset: number;
diff --git a/B06_Section/B06_Section_UI_Cross_Ford.ts b/B06_Section/B06_Section_UI_Cross_Ford.ts
index f5577ca81..769e7ce9f 100644
--- a/B06_Section/B06_Section_UI_Cross_Ford.ts
+++ b/B06_Section/B06_Section_UI_Cross_Ford.ts
@@ -10,7 +10,7 @@
  * ========================================================================== */
 
 import type { FordLayout, FordWallRole } from "./B06_Section_UI_Cross_Ford_Geom";
-import type { OffsetPoint } from "./B06_Section_UI_Cross_Culvert_Types";
+import { outlineBox, type OffsetPoint } from "./B06_Section_UI_Cross_Culvert_Types";
 import { appendChuteBand } from "./B06_Section_UI_Cross_Wall_Hatch";
 
 export {
@@ -187,17 +187,7 @@ export function appendFordOverlay(
     for (const side of layout.sides) {
       const points = side.parts.flatMap((part) => part.points);
       if (!points.length) continue;
-      const offsets = points.map((point) => point.offset);
-      const elevations = points.map((point) => point.elevation);
-      const [left, right] = [Math.max(...offsets), Math.min(...offsets)];
-      const [top, bottom] = [Math.max(...elevations), Math.min(...elevations)];
-      const box = [
-        { offset: left, elevation: top },
-        { offset: right, elevation: top },
-        { offset: right, elevation: bottom },
-        { offset: left, elevation: bottom },
-      ];
-      const hit = polygon(box, "b06-chart__culvert-revet-hit", "");
+      const hit = polygon(outlineBox(points), "b06-chart__culvert-revet-hit", "");
       hit.addEventListener("click", (event) => {
         event.stopPropagation();
         onSelectWall(side.role);
diff --git a/resources/tester/helper_190_1_basin_pick.cjs b/resources/tester/helper_190_1_basin_pick.cjs
new file mode 100644
index 000000000..a09a1949b
--- /dev/null
+++ b/resources/tester/helper_190_1_basin_pick.cjs
@@ -0,0 +1,190 @@
+/* PLAN 190-1 단위검증 헬퍼 — B06 집수정 판정면 = 부재 외곽 가상 사각형(세월교 측벽 꼴).
+ * 화면 TS 를 그 자리에서 트랜스파일해 Node 로 돌림 · 결과 = 표준출력 JSON 한 벌.
+ * 입력 = `fixtures/b07_cross_overlay_sections.json` 배관 측점 + design.inlet_structure 강제(U · L · I).
+ * 짝 = `test_190_1_basin_pick.py`.
+ */
+const fs = require("fs");
+const path = require("path");
+const ts = require(path.join(__dirname, "..", "..", "config", "node_modules", "typescript"));
+
+const ROOT = path.join(__dirname, "..", "..");
+const cache = new Map();
+const STUBS = {
+  "@ui/ui_template_toast": { showToast: () => undefined },
+  "@ui/ui_template_elements": { showToast: () => undefined },
+};
+
+// ── SVG 그릇 흉내 — 오버레이가 쓰는 만큼만 ─────────────────────────────────
+class FakeNode {
+  constructor(tag) {
+    this.tagName = String(tag).toUpperCase();
+    this.children = [];
+    this.attrs = {};
+    this.listeners = {};
+    this.textContent = "";
+    this._classes = new Set();
+    const self = this;
+    this.classList = {
+      add: (...names) => names.forEach((n) => self._classes.add(n)),
+      toggle: (name, force) => {
+        const on = force === undefined ? !self._classes.has(name) : !!force;
+        on ? self._classes.add(name) : self._classes.delete(name);
+        return on;
+      },
+      contains: (name) => self._classes.has(name),
+    };
+  }
+  append(...kids) {
+    kids.forEach((k) => this.children.push(k));
+  }
+  appendChild(kid) {
+    this.children.push(kid);
+    return kid;
+  }
+  setAttribute(name, value) {
+    this.attrs[name] = String(value);
+    if (name === "class") this._classes = new Set(String(value).split(/\s+/).filter(Boolean));
+  }
+  getAttribute(name) {
+    return this.attrs[name] ?? null;
+  }
+  addEventListener(type, fn) {
+    (this.listeners[type] ??= []).push(fn);
+  }
+  click() {
+    let stopped = false;
+    const event = { stopPropagation: () => (stopped = true), preventDefault: () => {} };
+    (this.listeners.click ?? []).forEach((fn) => fn(event));
+    return stopped;
+  }
+}
+globalThis.document = {
+  createElement: (tag) => new FakeNode(tag),
+  createElementNS: (_ns, tag) => new FakeNode(tag),
+};
+
+function loadTs(file) {
+  const full = path.resolve(file);
+  if (cache.has(full)) return cache.get(full);
+  if (full.endsWith(".json")) {
+    const data = JSON.parse(fs.readFileSync(full, "utf8"));
+    cache.set(full, data);
+    return data;
+  }
+  const js = ts.transpileModule(fs.readFileSync(full, "utf8"), {
+    compilerOptions: {
+      module: ts.ModuleKind.CommonJS,
+      target: ts.ScriptTarget.ES2020,
+      esModuleInterop: true,
+    },
+  }).outputText;
+  const box = { exports: {} };
+  cache.set(full, box.exports);
+  const localRequire = (request) => {
+    if (STUBS[request]) return STUBS[request];
+    const alias = { "@util/": "common_util", "@ui/": "ui_template", "@config/": "config" };
+    for (const [prefix, dir] of Object.entries(alias))
+      if (request.startsWith(prefix))
+        return loadTs(resolve(path.join(ROOT, dir, request.slice(prefix.length))));
+    return loadTs(resolve(path.join(path.dirname(full), request)));
+  };
+  new Function("exports", "module", "require", js)(box.exports, box, localRequire);
+  cache.set(full, box.exports);
+  return box.exports;
+}
+const resolve = (base) =>
+  [base, `${base}.ts`, path.join(base, "index.ts")].find(
+    (p) => fs.existsSync(p) && fs.statSync(p).isFile(),
+  ) ?? `${base}.ts`;
+
+const B06 = (f) => path.join(ROOT, "B06_Section", `${f}.ts`);
+const { computeStoredLayouts } = loadTs(B06("B06_Section_Structure_Layouts"));
+const { appendCulvertOverlay } = loadTs(B06("B06_Section_UI_Cross_Culvert"));
+const { outlineBox } = loadTs(B06("B06_Section_UI_Cross_Culvert_Types"));
+
+const fixture = JSON.parse(
+  fs.readFileSync(path.join(__dirname, "fixtures", "b07_cross_overlay_sections.json"), "utf8"),
+);
+const sections = fixture.cross_sections;
+const pipeSection = sections.find((s) => s.culvert && !s.culvert.hidden_pipe);
+const BASIN_TIP = "유입 집수정 선택 — 조정창에서 구조물 형식 선택";
+const X = (o) => -o * 10;
+const Y = (e) => -e * 10;
+const pointsOf = (node) => node.attrs.points.split(" ").map((pair) => pair.split(",").map(Number));
+
+function basinCase(shape) {
+  const target = { ...pipeSection, design: { ...pipeSection.design, inlet_structure: shape } };
+  const layout = computeStoredLayouts(target, sections).culvert;
+  const layer = new FakeNode("g");
+  const picked = [];
+  const setter = appendCulvertOverlay(layer, layout, X, Y, (key) => picked.push(key));
+  const hits = layer.children.filter((n) => n.classList.contains("b06-chart__culvert-revet-hit"));
+  const basinHits = hits.filter((n) => n.children[0]?.textContent === BASIN_TIP);
+  const all = layout.basin.parts.flatMap((part) => part.points);
+  // 기대 외곽(화면 좌표) — 부재 전 꼭짓점의 최소 · 최대
+  const xs = all.map((p) => X(p.offset));
+  const ys = all.map((p) => Y(p.elevation));
+  const expect = {
+    minX: Math.min(...xs),
+    maxX: Math.max(...xs),
+    minY: Math.min(...ys),
+    maxY: Math.max(...ys),
+  };
+  const got = basinHits.length ? pointsOf(basinHits[0]) : [];
+  const gotBox = got.length
+    ? {
+        minX: Math.min(...got.map(([px]) => px)),
+        maxX: Math.max(...got.map(([px]) => px)),
+        minY: Math.min(...got.map(([, py]) => py)),
+        maxY: Math.max(...got.map(([, py]) => py)),
+      }
+    : null;
+  const stopped = basinHits.length ? basinHits[0].click() : false;
+  // 그림 모양은 그대로 — 집수정 부재 폴리곤 = 부재 점열 그대로 · 고르면 부재 강조
+  const drawn = layer.children.filter((n) => n.classList.contains("b06-chart__culvert-basin"));
+  const drawnSame = drawn.every(
+    (n, i) =>
+      n.attrs.points ===
+      layout.basin.parts[i].points.map((p) => `${X(p.offset)},${Y(p.elevation)}`).join(" "),
+  );
+  setter("inlet");
+  const activeOnInlet = drawn.every((n) => n.classList.contains("is-active"));
+  return {
+    shape: layout.basin.shape,
+    parts: layout.basin.parts.length,
+    basinHits: basinHits.length,
+    corners: got.length,
+    expect,
+    got: gotBox,
+    picked,
+    stopped,
+    lastHitIsBasin: hits[hits.length - 1] === basinHits[0],
+    drawnParts: drawn.length,
+    drawnSame,
+    activeOnInlet,
+  };
+}
+
+const out = { U: basinCase("U"), L: basinCase("L"), I: basinCase("I") };
+// 세월교 측벽과 같은 함수 — ㄴ 점열의 외곽
+const ell = [
+  { offset: 0, elevation: 0 },
+  { offset: 0.3, elevation: 0 },
+  { offset: 0.3, elevation: 2 },
+  { offset: 1.5, elevation: 2 },
+  { offset: 1.5, elevation: 2.3 },
+  { offset: 0, elevation: 2.3 },
+];
+out.outline = outlineBox(ell);
+// 판정면 없으면(onSelect 없음 · B07) 집수정 판정면도 없음
+{
+  const target = { ...pipeSection, design: { ...pipeSection.design, inlet_structure: "U" } };
+  const layout = computeStoredLayouts(target, sections).culvert;
+  const layer = new FakeNode("g");
+  appendCulvertOverlay(layer, layout, X, Y);
+  out.noSelectHits = layer.children.filter((n) =>
+    n.classList.contains("b06-chart__culvert-revet-hit"),
+  ).length;
+}
+
+process.stdout.write(JSON.stringify(out));
diff --git a/resources/tester/test_190_1_basin_pick.py b/resources/tester/test_190_1_basin_pick.py
new file mode 100644
index 000000000..cea785514
--- /dev/null
+++ b/resources/tester/test_190_1_basin_pick.py
@@ -0,0 +1,85 @@
+"""PLAN 190-1 — B06 집수정 고르기 판정면 = 부재 외곽 가상 사각형(세월교 측벽 ㄴ 꼴 · 79-6).
+
+짝: `B06_Section/B06_Section_UI_Cross_Culvert.ts`(집수정 판정면) · `_Cross_Ford.ts`(측벽 판정면) ·
+`_Cross_Culvert_Types.ts`(`outlineBox` 한 벌). [상세] 모달은 카드 그림 복제라 같은 판정면을 가짐.
+실제 TS 를 `helper_190_1_basin_pick.cjs` 가 Node 로 돌린다.
+"""
+
+from __future__ import annotations
+
+import json
+import os
+import subprocess
+
+import pytest
+
+HERE = os.path.dirname(__file__)
+ROOT = os.path.join(HERE, "..", "..")
+
+pytestmark = pytest.mark.skipif(
+    not os.path.isdir(os.path.join(ROOT, "config", "node_modules")),
+    reason="프론트엔드 의존성 미설치",
+)
+
+
+@pytest.fixture(scope="module")
+def out() -> dict:
+    proc = subprocess.run(  # noqa: S603 — 고정 실행 파일
+        ["node", os.path.join(HERE, "helper_190_1_basin_pick.cjs")],
+        capture_output=True,
+        text=True,
+        encoding="utf-8",
+        timeout=60,
+    )
+    assert proc.returncode == 0, proc.stderr
+    return json.loads(proc.stdout)
+
+
+def _src(rel: str) -> str:
+    with open(os.path.join(ROOT, rel), encoding="utf-8") as f:
+        return f.read()
+
+
+@pytest.mark.parametrize("shape,parts", [("U", 3), ("L", 2), ("I", 1)])
+def test_집수정_판정면은_외곽_사각_하나(out, shape, parts) -> None:
+    case = out[shape]
+    assert case["shape"] == shape and case["parts"] == parts
+    assert case["basinHits"] == 1  # 부재마다가 아니라 한 장
+    assert case["corners"] == 4
+    for key in ("minX", "maxX", "minY", "maxY"):
+        assert case["got"][key] == pytest.approx(case["expect"][key], abs=1e-9)
+
+
+@pytest.mark.parametrize("shape", ["U", "L", "I"])
+def test_누르면_집수정_고름(out, shape) -> None:
+    case = out[shape]
+    assert case["picked"] == ["inlet"]
+    assert case["stopped"] is True  # 카드 고름으로 안 번짐
+    assert case["lastHitIsBasin"] is True  # 맨 위 — 관 판정면보다 위
+
+
+@pytest.mark.parametrize("shape", ["U", "L", "I"])
+def test_그림_모양은_그대로(out, shape) -> None:
+    case = out[shape]
+    assert case["drawnParts"] == case["parts"]
+    assert case["drawnSame"] is True
+    assert case["activeOnInlet"] is True
+
+
+def test_외곽_사각_함수(out) -> None:
+    box = [(p["offset"], p["elevation"]) for p in out["outline"]]
+    assert box == [(1.5, 2.3), (0, 2.3), (0, 0), (1.5, 0)]
+
+
+def test_고름_없으면_판정면_없음(out) -> None:
+    assert out["noSelectHits"] == 0  # B07 등 onSelect 없는 그림
+
+
+def test_세월교_측벽과_같은_함수() -> None:
+    types = _src("B06_Section/B06_Section_UI_Cross_Culvert_Types.ts")
+    assert "export function outlineBox(points: OffsetPoint[]): OffsetPoint[] {" in types
+    ford = _src("B06_Section/B06_Section_UI_Cross_Ford.ts")
+    assert 'polygon(outlineBox(points), "b06-chart__culvert-revet-hit", "")' in ford
+    assert "Math.max(...elevations)" not in ford  # 측벽 외곽 따로 셈 없음
+    culvert = _src("B06_Section/B06_Section_UI_Cross_Culvert.ts")
+    assert "outlineBox(basinPoints)" in culvert