Introduction Gully pots or roadside catch basins are a common and important part of sewerage drainage networks. Their primary function is to retain larger solids from road runoff. They are used to minimize the problems associated with sediment in downstream drainage structures, pumps, treatment plants and receiving waters. Problem definition Gully pots clogging problems have gradually been recognized over recent years. Blockage of inflow devices (especially gully pots) is the most frequent cause of flooding, for flooding of buildings and of roads. Gully pot blockages cause the highest numbers of flood incidents and are subject to larger uncertainty than other basic events. Research After literature study, it is clear that my research focuses on large particles clogging problem. To achieve my goal, the approach could be divided in several aspects: 1. In the first place, In order to define the large particles which real clogged gully pot, a field work to interview the on-site workers from cleaning company is done. 2. Based on feedback from on-site field work, 4 kind of new alternatives are proposed. 3. Then a laboratory experiment is designed to test these alternatives and also a new re-designed gully pot provided by Wavin Company. Results 1. The new grating alternatives for original gully pot can significantly reduce the incidence of gully pot clogging problem. They can reduce the covering percentage of the grating during the extreme rain fall event and leave more opening space on the grating. 2. The new gully pot from Wavin Company has a better performance than the original gully pot. But considering the big settling tank and large grating of the new gully pot, it is not fair to directly compare with the other alternatives of original gully pot. Conclusions and recommendations The gully pot clogging problems can be improving by new alternatives design. And the results show that big size of gully pot design also will be a good choice in the future. However, the experiment results show that the new alternatives will cause a higher water level on the testing table. Also the bicycle safety on the road should be considered. For the further research, the experiment method should be improved and the maintenance cost for the new design should be a concern.