In this thesis interactions between water waves and porous bodies are investigated. In accordance with Taylor's fine-pore assumption, Darcy's law is applied to the porous boundary surface. The hydrodynamic identities added mass and damping coefficients, the Haskind relation and the energy equation is examined for a deeply submerged sphere, as well a hemisphere floating on the free surface. An inner sloshing mode is observed to wavelengths equal to the body's diameter. Diffraction drift forces are calculated using momentum conservation as basis, and results similar to those of Zhao et al. is achieved. It is found that the drift forces upon porous bodies are greater than those of solid bodies in the long wave regime.