![]() ![]() There you can add a trendline and Excel will generate the equation coefficients. Intensity points into an Excel spreadsheet and use its charting function. If you do not know the specific equation coefficients you can enter Tc vs. You have the option of creating IDF curves using a third degree polynomial equation as follows: These curves typically do not plot as a straight line on log-log scales. Some regions have IDF curves which are based on a third-degree polynomial equation. If, in your equation, X = Duration in hours, multiply B by 60^E or B = B x 60^E. This can be transformed into I = B/(X)^E or: There may be occasions where you need to match an equation that differs from the IDF Curve equation shown above. IDF Curve EquationĮ = coefficient My Equation Doesn’t Match This To enter your own coefficients, select Enter Known Equation Coefficients from the IDF Wizard opening screen shown below.Ĭhoose one of the following equation types and click. Each can accept custom coefficients to match your exact IDF curves. ![]() Hydrology Studio uses two types of equations. Even though there are several ways to setup your IDF Curves in the beginning, once completed, they all take the form of an equation. ![]()
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