Standard Project Flood for the drainage area involved is the flood that

• A. is sure to be equalled in magnitude once or more time in the estimated life of the project
• B. is likely to be exceeded in magnitude only at rare occasions in the estimated life of the project
• C. might occur under the worst meteorological and hydrological conditions in the estimated life of the project
• D. will occur under standard meteorological conditions in the estimated life of the project