Coastal and Floodplain Construction Inspector's Practice Exam

Which of the following is a recommended material for gravel above BFE for splash pads?

1. Wood mulch

2. Concrete gravel

3. Rock or gravel

4. Plastic sheeting

The correct answer is: Rock or gravel

Rock or gravel is recommended for use above Base Flood Elevation (BFE) for splash pads due to its durability, drainage properties, and ability to withstand erosion from water flow. In coastal and floodplain areas, it's essential to choose materials that can effectively manage water runoff and reduce potential hazards such as erosion and flood damage. Rock or gravel helps facilitate proper drainage, preventing water from pooling on the surface, which can be a significant factor in maintaining the integrity of the splash pad and surrounding areas. Additionally, these materials provide a stable and non-slip surface for users while also being less susceptible to degradation compared to organic materials, like wood mulch, which can break down over time and create a maintenance issue. In contrast, wood mulch is not suitable because it can decompose quickly in wet environments, leading to potential mold growth and requiring more frequent replacement. Concrete gravel may not have the best drainage capabilities and can create a hard surface that's not ideal for splash pads. Plastic sheeting does not provide appropriate structural support or drainage and is typically used for other construction purposes, not as a surface material.