What have residents been told?
Anyone who lives within the affected area is asked to prepare to be out of their homes for 24 hours and make preparations should they need medicines or require pets to be moved from an address.
The initial rest centre for those affected will be located at the Salvation Army, 38 Osmaston Road, Derby, DE1 2HU, and is being run by Derby City Council.
Officers will be knocking on the doors of all the properties within the cordon, Derbyshire Live reports.
