1. What is Mean Water Surface Elevation?

Mean Water Surface Elevation is the average height of a body of water's surface, calculated as the difference between coastal water depth and still-water depth.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: This formula calculates the average elevation of the water surface by subtracting the still-water depth from the total coastal water depth.

3. Importance of Mean Water Surface Elevation

Details: Accurate calculation of mean water surface elevation is crucial for coastal engineering, flood prediction, and understanding tidal variations in coastal areas.

4. Using the Calculator

Tips: Enter coastal water depth and still-water depth in meters. Both values must be valid non-negative numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between coastal water depth and still-water depth?
A: Coastal water depth includes the total depth from water surface to bottom, while still-water depth excludes the effects of waves and short-term fluctuations.

Q2: When is this calculation most useful?
A: This calculation is particularly useful in coastal engineering projects, tidal studies, and flood risk assessment.

Q3: What units should be used for input values?
A: Both input values should be in meters for consistent results.

Q4: Can this formula be used for all water bodies?
A: While primarily designed for coastal waters, the formula can be applied to any water body where the distinction between total depth and still-water depth is relevant.

Q5: What does a negative result indicate?
A: A negative mean water surface elevation would indicate that the still-water depth exceeds the coastal water depth, which may suggest measurement error or specific hydrological conditions.