A new Drainage Utility Charge took effect July 1, 2011 to help pay for drainage and street projects with a drainage component. The charge is based on the actual impact a property has on drainage infrastructure. It is determined by calculating the property's impervious surface. Eight of the ten largest Texas Cities have drainage charges, including Houston, Dallas, San Antonio, Austin, El Paso, Fort Worth, Lubbock, and Abilene. The Drainage Utility Ordinance (No. 2011-254) states that the Utility Charge will not be increased for a minimum of ten years.