Abstract: The present invention is a drainage system for a sink that has a drainage pipe and a drainage box. Drainage pipe connects sink and drainage box and has a substantial portion longitudinal which occupies less space under sink and provide more useful area for stacking or storage. Drainage box is fitted under sink and eases periodic maintenances and chock up/article removal without the need to dismantle drainage pipe by providing an openable outlet. Drainage box includes an inlet hole for receiving drainage pipe which disburses liquid and solid wastes therewithin, an outlet hole which is in fluid communication with a drainage outlet provided on the wall for exit of liquid wastes and an openable outlet to remove solid wastes. Openable outlet is easy to open and hence eliminates the need for calling a plumber in event of chock up or for removing accidentally fallen articles such as rings.