Clm4

Total fractional snow-layer compaction rate combining destructive metamorphism (Eq. 5.26), overburden pressure (Eq. 5.28), and melt-induced compaction (Eq. 5.31). Migrated from UrbanCanopy.jl@9200edd4 src/hydrology.jl:174 (`SnowCompaction` @component). Implements Oleson et al. (2010) CLM4 Tech Note Chapter 5, Section 5.1.4, Eqs. 5.24–5.33. Parameterized as observed-only: T_i, w_ice, w_liq, dz, P_s, f_ice_n, f_ice_n1 are inputs; c_1, c_2, C_R1, eta, C_R2, C_R3, C_R are algebraic outputs.

Conservation of ice mass in snow layers and new snowfall accumulation (Oleson et al. 2010, CLM4 Tech Note Ch. 5, Section 5.1.1, Eqs. 5.6-5.14). Migrated from UrbanCanopy.jl@9200edd4 src/hydrology.jl:79 (`SnowIceContent` @component). Parameterized as observed-only: q_grnd_ice, q_frost, q_subl, rho_sno are inputs (parameters); dz_sno_dt, q_ice_top are algebraic outputs.

Volumetric ice/liquid contents and outgoing liquid-water flux for a snow layer (Oleson et al. 2010, CLM4 Tech Note Ch. 5, Eqs. 5.18–5.20). Migrated from UrbanCanopy.jl@9200edd4 src/hydrology.jl:119 (`SnowWaterContent` @component). Parameterized as observed-only: w_ice, w_liq, dz are inputs (parameters); theta_ice, theta_liq, q_liq_out are algebraic outputs.