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## Canopy Water

The article discusses the interception, throughfall, and drip of liquid and solid precipitation by the canopy. Key points:

**Interception**
- Liquid precipitation is intercepted by the canopy according to the fractions f_pi,liq and f_pi,ice.
- These fractions depend on the exposed leaf and stem area index (L+S).

**Throughfall and Drip**
- Throughfall (q_thru,liq and q_thru,ice) is the precipitation that reaches the ground.
- Canopy drip (q_drip,liq and q_drip,ice) occurs when the canopy water exceeds the maximum storage.

**Canopy Water Update**
- The canopy liquid water (W_can,liq) and snow water (W_can,sno) are updated over time.
- Evaporation from the canopy (E_v^liq and E_v^ice) is partitioned based on vegetation temperature.

**Ground Precipitation**
- The total liquid and solid precipitation reaching the ground (q_grnd,liq and q_grnd,ice) is the sum of throughfall and drip.

**Wetted/Dry Fraction**
- The wetted fraction (f_wet) and dry fraction (f_dry) of the canopy are calculated.
- The snow-covered fraction (f_can,sno) is used for surface albedo calculations.