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By following these steps, you should be able to successfully download, install, and use the Hydraflow Express extension for AutoCAD Civil 3D. I understand you're looking for content related to
: Supports SCS, Rational, and Modified Rational methods for hydrograph calculations and simple detention storage estimates. and triangular channels using Manning’s equation.
Unlocking Efficient Stormwater Management with Hydraflow Express Extension for AutoCAD Civil 3D or tampered files
Open Channel Flow: Calculating normal-depth rating curves for rectangular, trapezoidal, and triangular channels using Manning’s equation.