Finding a Leak in a Two-Pond System with Stream

13-year-old lined system: 8-ft lower pond (18" deep) → 35-ft uphill to 4-ft upper pond (10" deep) → stream back. Refilling >1x/week. How to locate leak without rebuild.

Leak Detection Methods

1. Inspect liner where exposed to sunlight (UV degrades).
2. Use leak-detection dye (pool supply store) if no fish.
3. Let water drop; level stabilizes at leak height.

Check stream edges, connections, and pump fittings. 13-year-old liner may have multiple small leaks.