In 2010, this district revoked groundwater-pumping entitlements with an estimated value in excess of USD 3 million for several groundwater users who had attempted to increase their water use illegally by bypassing their well flow meters (McCook Gazette 2010). Flat pricing over time does not affect long term incentives (Civita et al., This type of scheme may also affect the response to pricing, e.g. a two-layer block-rate tariff with a very low price up to a certain quantity, and very high above it may have similar effects to that of a water quota, as observed in Mexico (de Richter, 2013).