Seasonal microclimate control of calcite fabrics, stable isotopes and trace elements in modern speleothem from St Michaels Cave, Gibraltar - Tufas and Speleothems: Unravelling the Microbial and Physical Controls - page 326

Fig. 5. Comparison of drip discharge rates at the Flowstone, Dark Rift and Gib04a sites compared with daily rainfall
and recharge expressed as monthly P-ET. Daily water discharge rates were calculated using data from continuously
logged using acoustic drip counters and a drop volume of 0.15 ml (Collister & Mattey 2008). Daily rainfall amounts
were measured at the Gibraltar Meteorological Office, 3 km from the entrance to St. Michaels Cave and P-ET calculated
using the Thornthwaite method (Thornthwaite 1948). Meteorological data # The Met Office, UK.