Thursday, August 8, 2013

🌧️ Rules for NRCS Unit Hydrographs in InfoSWMM πŸ“ˆ

Subject: 🌧️ Rules for NRCS Unit Hydrographs in InfoSWMM πŸ“ˆ

When applying NRCS (Natural Resources Conservation Service) Unit Hydrographs for hydrological modeling in InfoSWMM adhere to the following rules or guidelines to ensure accurate hydrological simulations:

  1. Curve Number (CN) Source πŸ—‚️: Obtain the Curve Number (CN) from the NRCS_CN column in the Subcatchment Table, representing runoff potential based on soil type, land use, and treatment practices.

  2. Time of Concentration (TC) ⏱️: The Time of Concentration, critical for hydrograph development, is sourced from the TC column within the Subcatchment Table.

  3. Infiltration Model Selection πŸ’§: Select the Infiltration Model according to the CN Infiltration Model Column in the Subcatchment Database Table to ensure consistency in infiltration calculations.

  4. CN Consistency Across Tables πŸ”„: The CN value in the Soil Database Table must match the CN in the Subcatchment Database Table for uniform hydrological parameters.

  5. Depression Storage and Initial Abstraction πŸ•³️➡️πŸ’§: If Depression Storage is zero in the Subcatchment Database Table, Initial Abstraction (IA) in inches will be internally calculated using the formula =0.2×(1000/10).

  6. Initial Abstraction Calculation ✏️: Clearly state that Initial Abstraction in US units is =0.2×(1000/10), indicating the use of American measurement standards.

By following these emoji-highlighted guidelines πŸ“, hydrological modeling using NRCS Unit Hydrographs within InfoSWMM will be precise and reliable, leading to better water management outcomes. πŸ’¦πŸ™️

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