EurOtop 2018 Wave Runup & Overtopping Calculator – Coastal Structure Design

EurOtop 2018 Wave Runup & Overtopping Calculator

Ru_2% • Mean overtopping discharge q • Influence factors γ_f, γ_β, γ_b, γ_v • Coastal structure design

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📐 1. EurOtop 2018 – Wave Overtopping Manual

EurOtop (2018) is the definitive manual for wave overtopping at sea defences, dikes, and breakwaters. This calculator implements the main formulas for:

Wave runup exceeded by 2% of waves (R_u2%): R_u2% = H_m0 · γ_f · γ_β · γ_b · γ_v · (1.75 – 0.32·cotα)
Mean overtopping discharge q (l/s per m): q = 0.09 · exp( -1.5 · R_c / (H_m0·γ_f·γ_β) ) for sloping structures

Influence factors: γ_f (roughness), γ_β (wave obliquity), γ_b (berm), γ_v (vertical wall). Default values for smooth impermeable slope: γ_f=1.0.

🚀 2. Runup & Overtopping Calculator (EurOtop 2018)

Significant wave height H_m0 (m)

Peak wave period T_p (s) – optional for overtopping

Slope angle (cotα) – e.g., 3 for 1:3 slope

Crest freeboard R_c (m) – crest elevation above SWL

Roughness factor γ_f (smooth=1.0; grass=0.9; rock=0.55; armour units=0.4-0.5)

Wave obliquity factor γ_β (1.0 for perpendicular; 0.8 for 30°)

Berm factor γ_b (1.0 if no berm; 0.7 if wide berm)

Vertical wall factor γ_v (1.0 for slope; 1.2 for vertical)

Batch CSV (Hm0, Rc, cotα)

Get PDF Report via Email

CSV Template

📊 3. Structure Profile & Runup Schematic

📈 4. Runup vs Wave Height & Overtopping Sensitivity

📘 5. How to Use the Calculator

Enter wave conditions: H_m0, T_p (optional, for overtopping).
Specify structure geometry: slope cotα, crest freeboard R_c.
Adjust influence factors (γ_f, γ_β, γ_b, γ_v) based on armour type, wave angle, berm, and wall type.
Click "Compute" – runup (R_u2%) and mean overtopping discharge (q) are calculated.
2D schematic shows the slope, crest, runup level, and overtopping.
Batch CSV: upload multiple designs for quick comparison.
PDF report includes all inputs, results, and sketch.

❓ Frequently Asked Questions

❓ What is an acceptable overtopping discharge?

For pedestrians on dikes: 0.01–0.1 l/s/m; for vehicles: 1–10 l/s/m; for crest stability: 10–50 l/s/m. Check EurOtop tables.

❓ How to choose γ_f?

Smooth concrete/asphalt: 1.0; Grass: 0.9; Rock armour (2 layers): 0.55; Tetrapods: 0.5; Xblocs: 0.45.

❓ Does this tool handle vertical walls?

Yes, set γ_v=1.2 and cotα=0 (approx). For precise vertical walls, use the dedicated formula in extended version.

🌐 References

EurOtop 2018 Manual (www.overtopping-manual.com) | Coastal Engineering Manual (CEM)

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