The Retaining Wall Surcharge Soil Pressure & Block Count Sizer provides a three-variable mathematical modeling interface for exploring comparative structural sizing ratios in landscape retaining wall design.

### Mathematical Formulation The tool evaluates user parameters using three generalized algebraic equations: - Primary Metric: $(val_1 \times val_2) / \max(0.01, val_3)$. In structural retaining wall models, this represents proportional soil surcharge load relative to stem wall thickness or base embedment depth. - Geometric Mean (Secondary Index): $\sqrt{\max(0, val_1 \times val_2)}$, modeling transitional lateral earth thrust across the wall backfill. - Efficiency Ratio (%): $\min(100, \max(0, (val_1 / (val_1 + val_2)) \times 100))$, expressing relative load weighting.

### Note on Civil Engineering Retaining Wall Design This utility computes a generalized three-parameter algebraic ratio. It does not replace Coulomb or Rankine lateral active earth pressure ($K_a$) calculations, seismic surcharge analysis, global slope stability slip-circle modeling, or manufacturer geogrid installation tables. Retaining walls retaining slopes or supporting driveway surcharges require certified civil engineering design.

### Worked Numeric Example Using default inputs: - Primary Dimension / Load ($val_1$): 100 - Secondary Factor / Velocity ($val_2$): 20 - Tuning / Geometric Modifier ($val_3$): 5 - Results: - Primary Ratio: $(100 \times 20) / 5 = 400.00$ - Geometric Mean: $\sqrt{100 \times 20} = \sqrt{2000} \approx 44.72$ - Efficiency Ratio: $(100 / (100 + 20)) \times 100 = 83.33\%$

### In-Browser Processing All equations evaluate directly within your client browser session using local JavaScript. No civil design parameters or site specifications are transmitted across external networks.