Drainage Services Responsibility for clearing blockages or repairing defects in a private shared drain is a matter to be resolved by the residents that are served by it, please read the Notice to Householders for more information. Business Blocked Drains Find out information on the Fats and Oil Programme (FOG) Sandbag Policy Find information on our Sandbag policy Surface Water Network Connection Find information about new connections to surface water sewers in the city. Drainage Requirements for Planning Applications Find information on drainage requirements for planning applications.