The tax aims at collecting funds for water management and guiding users towards a more efficient use of water and to allocate water where it creates most value. While 10% goes to the National Water Authority (role currently played by the National Environmental Agency) to cover expenses at the national level, the remaining 40% goes to a National Environmental Fund and is used on a competitive basis to finance project proposals submitted by the hydrographic regions. This means that the hydrographic regions are guaranteed use at least 50% of the funds they collect. They can also apply for additional funds on a competitive basis and receive more revenue than what they collected.