Erosion of the seabed around offshore structures, due to current and waves, is a common occurrence. Scour protection by rock placement can be done in order to limit erosion and its consequences. Tideway Offshore Solutions will use the multipurpose vessel ’Living Stone’ to execute such rock placement operations. Aboard the Living Stone a newly designed inclined fall pipe system will be installed to transfer the rocks through shallow and possibly high current water towards the seabed. The goal of this thesis is to design a concept of a rock handling system to feed the inclined fall pipe system aboard of the Living Stone. The concept requires to be capable of handling armourstone with gradings up to 60-300kg and continuous mass flows up to — tonnes per hour. With the use of the VDI 2221 design cycle the function, principle and solution structures were created to realise a morphological overview. Multiple concepts were created and evaluated on criteria including the maximum allowance of peak production, proven technology, maximum solvability, minimum required space and minimum costs. Thereafter, a preliminary layout was created for the concept ranked highest. In order to be sure the concept is capable of generating the demanded mass flows in terms of capacity and accuracy, discrete element modelling was used. With the use of EDEM-software the performance of the in Solidworks created model was studied. After calibration of the simulated material, the performance of the concept was studied by varying the outlet area and the feeders’ velocity. This resulted in the associated mass flows and their fluctuations. The accuracy of the mass flow was defined as a percentage of the mass flow in which the flow fluctuated. The configuration was studied and set for further simulations, using Box-Behnken design of experiments and Minitab-software. The mass flow, depending on the installed shear height and the velocity of the feeder, was validated with empirical theory for apron feeders. This work demonstrated that the ratio between the outlet area, defined as the outlet diameter but realised by the shear height and feeder width, and the maximum particle diameter is of great influence on the mass flow. The smaller the ratio, due to an increase of particle size and/or decrease in outlet area, the less accuracy of the simulated mass flow. The difference between the simulated and theoretical mass flow increases exponential with the decrease of the ratio between outlet diameter and maximum particle diameter.