/**
 * This function calculates the required culvert diameter for a given flow rate, slope,
 * and culvert material for a civil engineering project.
 *
 * @param flowRate The flow rate of the water (in cubic meters per second)
 * @param culvertDiameter The initial guess value for culvert diameter (in meters)
 * @param slope The slope of the culvert (in meters per meter)
 * @param culvertMaterial The material of the culvert (e.g., concrete, steel, plastic)
 * @return The final calculated culvert diameter
 */
fun calculateCulvertDesign(flowRate: Double, culvertDiameter: Double, slope: Double, culvertMaterial: String): Double {

    val roughnessCoefficients = mapOf(
        "concrete" to 0.015,
        "steel" to 0.012,
        "plastic" to 0.022
    )

    if (culvertMaterial !in listOf("concrete", "steel", "plastic")) {
        return Double.NaN // Invalid culvert material, please provide a valid material.
    }

    if (flowRate <= 0 || culvertDiameter <= 0 || slope <= 0) {
        return Double.NaN // Invalid input parameters. Please provide positive values.
    }

    // Add your culvert diameter calculation logic here

    return 0.0 // Placeholder for the final calculated culvert diameter
}
/**
 * This function calculates the required culvert diameter for a given flow rate, slope,
 * and culvert material for a civil engineering project.
 *
 * @param flowRate The flow rate of the water (in cubic meters per second)
 * @param culvertDiameter The initial guess value for culvert diameter (in meters)
 * @param slope The slope of the culvert (in meters per meter)
 * @param culvertMaterial The material of the culvert (e.g., concrete, steel, plastic)
 * @return The final calculated culvert diameter
 */
fun calculateCulvertDesign(flowRate: Double, culvertDiameter: Double, slope: Double, culvertMaterial: String): Double {
/**
 * This function calculates the required culvert diameter for a given flow rate, slope,
 * and culvert material for a civil engineering project.
 *
 * @param flowRate The flow rate of the water (in cubic meters per second)
 * @param culvertDiameter The initial guess value for culvert diameter (in meters)
 * @param slope The slope of the culvert (in meters per meter)
 * @param culvertMaterial The material of the culvert (e.g., concrete, steel, plastic)
 * @return The final calculated culvert diameter
 */
fun calculateCulvertDesign(flowRate: Double, culvertDiameter: Double, slope: Double, culvertMaterial: String): Double {

    val roughnessCoefficients = mapOf(
        "concrete" to 0.015,
        "steel" to 0.012,
        "plastic" to 0.022
    )

    if (culvertMaterial !in listOf("concrete", "steel", "plastic")) {
        return Double.NaN // Invalid culvert material, please provide a valid material.
    }

    if (flowRate <= 0 || culvertDiameter <= 0 || slope <= 0) {
        return Double.NaN // Invalid input parameters. Please provide positive values.
    }

    // Add your culvert diameter calculation logic here

    return 0.0 // Placeholder for the final calculated culvert diameter
}