/// <summary>
        /// Calculates coefficient C_f for freestanding walls and signs
        /// </summary>
        /// <param name="h">Sign height</param>
        /// <param name="B">Horizontal dimension of sign, in feet</param>
        /// <param name="s">vertical dimension of the sign, in feet </param>
        /// <param name="epsion_s">ratio of solid area to gross area</param>
        /// <param name="x">horizontal distance from  windward edge</param>
        /// <param name="L">Length of return wall</param>
        /// <param name="LoadCase">Case A, B or C</param>
        /// <returns></returns>
        public double GetWallOrSignPressureCoefficient(double h, double B, double s, double epsion_s, double x = 0, double L = 0, FreestandingWallLoadCase LoadCase = FreestandingWallLoadCase.C)
        {
            throw new NotImplementedException();
            double C_f = 0.0;
            if (LoadCase == FreestandingWallLoadCase.A || LoadCase == FreestandingWallLoadCase.B)
            {
                C_f = GetCoefficientCaseAB(h, B, s, epsion_s);
            }
            else if (LoadCase == FreestandingWallLoadCase.C)
            {
                C_f = GetCoefficientCaseC(h, B, s, epsion_s, x, L);
            }
            else
            {
                throw new NotImplementedException();
            }
            Quad q = new Quad();


        }
        /// <summary>
        /// Calculates coefficient C_f for freestanding walls and signs
        /// </summary>
        /// <param name="h">Sign height</param>
        /// <param name="B">Horizontal dimension of sign, in feet</param>
        /// <param name="s">vertical dimension of the sign, in feet </param>
        /// <param name="epsion_s">ratio of solid area to gross area</param>
        /// <param name="x">horizontal distance from  windward edge</param>
        /// <param name="L">Length of return wall</param>
        /// <param name="LoadCase">Case A, B or C</param>
        /// <returns></returns>
        public double GetWallOrSignPressureCoefficient(double h, double B, double s, double epsion_s, double x = 0, double L = 0, FreestandingWallLoadCase LoadCase = FreestandingWallLoadCase.C)
        {
            throw new NotImplementedException();
            double C_f = 0.0;

            if (LoadCase == FreestandingWallLoadCase.A || LoadCase == FreestandingWallLoadCase.B)
            {
                C_f = GetCoefficientCaseAB(h, B, s, epsion_s);
            }
            else if (LoadCase == FreestandingWallLoadCase.C)
            {
                C_f = GetCoefficientCaseC(h, B, s, epsion_s, x, L);
            }
            else
            {
                throw new NotImplementedException();
            }
            Quad q = new Quad();
        }