Natchez - While the doors to the Isle of Capri Casino boat have been closed until further notice, both the Grand Soleil and the Roth Hill Road casinos have flood plans for instances like this. Ted Doody, president of Natchez Enterprises, said the Roth Hill Road casino is building above the 100-year flood plain. The 100-year flood plain is the calculated level of flood water water expected to be equaled or exceeded at least once in a 100-year period.