The account measures the Total Ecosystem Accessible Fresh Water (TEAW) and the Net Ecosystem Accessible Fresh Water Surplus (NEAWS) adjusted for water stress during the vegetation growing season. Accounts in m3 are established for water stocks in terrestrial ecosystems (soil and vegetation) and water bodies (aquifers, lakes and dams, rivers). They include a distinction between total and accessible stocks, the difference being due to physical or economic constraints of abstraction, pollution or time mismatch between availability and requirements for natural or human uses. The water flow accounts are tracked from precipitation infiltration and runoff down to the final outflow. Total available effective rainfall (in hydrological terms), which is available to feed the water bodies, is precipitation minus Evapo‑Transpiration.
