IS 9214:1979 is the Indian Standard (BIS) for shore protection structures. This code of practice provides guidelines for the planning, layout, design, construction, and maintenance of shore protection structures. It covers various types like seawalls, groynes, and revetments, focusing on the data required and principles for protecting coastlines from erosion.
Provides guidance on the planning, design, and construction of various shore protection structures like seawalls, groynes, and revetments.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Primary Armour Stability Formula | Hudson formula: W = (γ_r * H³) / (K_d * (S_r - 1)³ * cot(α)) | Van der Meer formulae (separate equations for plunging and surging waves), which include wave period and storm duration. | The Rock Manual (C683) |
| Design Philosophy | Working Stress Design / Global Factor of Safety. | Limit State Design (LSD) with partial safety factors on loads and resistances. | BS EN 1997-1 (Eurocode 7) |
| Wave Overtopping Assessment | Qualitative guidance on providing adequate freeboard. | Quantitative prediction of mean overtopping discharge (q in l/s per m) using empirical formulae (e.g., from EurOtop). | The Rock Manual (C683) |
| Sea Level Rise Consideration | Not explicitly mentioned. | Mandatory consideration; design water levels are adjusted based on projected SLR over the structure's design life. | USACE CEM |
| Toe Scour Depth Estimation | General recommendation to place toe below anticipated scour line, often approximated. | Specific empirical formulas (e.g., Sumer & Fredsøe) to predict maximum scour depth at the toe. | USACE CEM |
| Armour Layer Thickness | Specified as a function of the characteristic dimension of the armour unit. | Specified as n * k_t * D_n50, where n is number of layers, k_t is a layer coefficient, and D_n50 is the nominal block diameter. | The Rock Manual (C683) |
| Permeability Representation in Design | Indirectly accounted for in the empirical stability coefficient (K_d) of the Hudson formula. | Explicitly included as a variable 'P' (notional permeability factor) in the Van der Meer formulae. | The Rock Manual (C683) |