river with a feed conduit 50 diverting water into the surge tank 26 a secondary intake 16 u2032 is also provided in this embodiment both primary intake 16 and the secondary intake 16 u2032 are connected to a common interconnection manifold 22 to then interconnect the containers 12 to the intakes when the water needs to be conveyed large distances a pump may be used to increase the head pressure in the conduit 20 that carries the water to the containers 12 fig5 shows sample reservoir storage calculations once the storage requirements for a location are determined system components can be selected to achieve a given storage requirement in fig5 a the design requirements for a 10 000 000 l system are shown in fig5 b a catchment area and a catchment volume for the catchment area are calculated in this example the roof area of a stadium is calculated to generate 10 000 000 l annum of water for storage in the licensing of these systems the cost of the licence can be determined using various parameters for example the licence cost can be based on the catchment size or the storage size the cost can be based on the average annual water catchment volume over a time period or the area of catchment alternatively the cost of the licence can be based on maximum storage capacity for storing water or the utilisation of that capacity a cost can be calculated by determining the catchment volume and then multiplying this value by a unit cost this cost can then be paid annually by a licensee although the method reservoir and system.