While the chapter is split into subsections depending on the type of policy instrument, in reality a policy mix is required for effective outcomes. For example, information instruments are required for determining the maximum nutrient load a catchment can sustain before certain water quality indicators are breached; stakeholder engagement is necessary to determine the acceptable risks and desired water outcomes at the local level; regulatory nutrient pollution allowances are required for diffuse pollution before markets can be established to achieve economic efficiency; and compensations may be required to improve equity outcomes and stakeholder agreement. This system, implemented by the Water Agencies, involves stakeholders at basin level working together in Basin Committees to determine the size of charges to levy within statutory national limits.