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+# Implementation Plan - Enhanced Water Processing
+
+## Phase 1: Configuration & Integration
+- [x] Task: Update `geodata_pipeline/config.py` (62aa4ec)
+    - [ ] Add `hydrolakes_dir` to `RawConfig`.
+    - [ ] Define `LakeConfig` dataclass (enabled, source_path, default_depth_m, match_tolerance_m).
+    - [ ] Add `lakes` field to `RiverErosionConfig`.
+
+## Phase 2: Lake Depth Lookup & Verification
+- [ ] Task: Implement `_find_lake_depths` in `geodata_pipeline/river_erosion.py`
+    - [ ] Input: Manual Blue Mask blobs (as polygons or centroids).
+    - [ ] Logic: Spatial query against HydroLAKES shapefile.
+    - [ ] Return: Depth for each blob + metadata (ID, Distance).
+- [ ] Task: Create a verification mode/log
+    - [ ] Log the matching results (Tile, Blob location, Matched HydroLAKE ID, Depth, Distance).
+
+## Phase 3: Manual Mask Loading
+- [ ] Task: Implement `_load_manual_mask` in `geodata_pipeline/river_erosion.py`
+    - [ ] Read PNG from `raw/river_masks_viz/{tile_id}.png`.
+    - [ ] Return semantic mask layers: Water (Blue), Island (Green), Bridge (Red).
+
+## Phase 4: Composition Logic
+- [ ] Task: Update `erode_rivers` in `geodata_pipeline/river_erosion.py`
+    - [ ] Load Manual Mask (if exists).
+    - [ ] **Overlay Logic:**
+        -   If Green: Set Depth = 0, Mask = 0.
+        -   If Red: Set Depth = 0, Mask = 0.
+        -   If Blue: Set Mask = 1.
+            -   Look up depth using `_find_lake_depths`.
+            -   Set Depth = Matched Lake Depth.
+    - [ ] Combine with existing River erosion (max depth wins for intersections, but Blue overrides River shape).
+    - [ ] Apply final depth map.