1. What is Still-Water Depth?

Still-Water Depth refers to the depth of the water at a particular location, excluding the effects of waves and other short-term fluctuations. It represents the baseline water level without dynamic surface variations.

2. How Does the Calculator Work?

The calculator uses the Still-Water Depth formula:

Where:

• \( h \) — Still-Water Depth (m)
• \( H_c \) — Coastal Water Depth (m)
• \( \eta' \) — Mean Water Surface Elevation (m)

Explanation: The formula calculates the still-water depth by subtracting the mean water surface elevation from the total coastal water depth, effectively removing the influence of surface variations.

3. Importance of Still-Water Depth Calculation

Details: Accurate still-water depth calculation is crucial for coastal engineering, navigation safety, sediment transport studies, and understanding baseline hydrological conditions without wave-induced fluctuations.

4. Using the Calculator

Tips: Enter coastal water depth and mean water surface elevation in meters. Both values should be measured consistently from the same reference point for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between still-water depth and total water depth?
A: Still-water depth excludes wave effects and surface fluctuations, while total water depth includes all surface variations and dynamic components.

Q2: When is still-water depth measurement important?
A: It's essential for structural design, flood modeling, and environmental studies where wave effects need to be separated from baseline water conditions.

Q3: How is mean water surface elevation determined?
A: Through averaging water level measurements over a significant period to eliminate tidal, wave, and other short-term fluctuations.

Q4: Can this calculation be used in rivers and lakes?
A: Yes, the principle applies to any water body where you need to separate still-water conditions from surface variations.

Q5: What are typical applications of still-water depth data?
A: Navigation channel design, coastal structure engineering, flood risk assessment, and hydrodynamic modeling.