Therefore some activities can impact indirectly other activities by increasing the scarcity or changing the quality of the resource they use in common. In terms of policy analysis, it implies that efficient management of the nexus resources needs to take into account the direct and indirect effects of changes in the demand and supply of the various resources on the whole biophysical and economic systems, as this is the only means to avoid negative side effects and to create synergies. For example, implementation of hydropower for electricity production can conflict with irrigation requirements where hydropow'er release schedules do not match the timing of irrigation needs. Under more favourable conditions and adequate operational management, a dam and reservoir can provide a win-win situation w ith both hydropow'er and agricultural benefits (Hellegers et al.,