WelberFerreira/SWAT-Model-664-CN-GW: Initial Release: MCN and MGW Modifications to SWAT Model

This release introduces two major enhancements to the SWAT model (version 664):

MCN (Modified Curve Number)

• Implements a generalized SCS-CN method allowing flexible initial abstraction ratios (λ).
• Adds calibration parameters α and β.
• Replaces default CN computation with a dynamic formulation.

MGW (Modified Groundwater Recharge)

• Introduces a sinusoidal model for aquifer recharge delay time (δ).
• Captures seasonal variation in groundwater levels.
• Adds δ_min, δ_max, and i_max as new variables.

Implementation

• Modified source files: modparm.f, allocate_parms.f, curno.f, surq_daycn.f, dailycn.f
• Compatible with SWAT-CUP for automated calibration.

This version is intended for researchers and hydrologists working in regions with seasonal hydrological patterns.