The District is proposing to update its rules regarding the C-51 Basin to reflect changes in basin conditions since the rule was originally implemented in 1987. These changes include an update to the extent of the basin boundaries and topographic information within the basin, installation and operation of water control facilities associated with the C-51 West project (STA-1E, the S-319 pump station, the S-155A "Divide" Structure and the S-155 Structure), as well as the resulting changes in the allowable 10-year, 3-day peak discharge rates and the minimum 100-year, 3-day finished floor elevations.