Method for controlling a water supply network which comprises node components (2; 4, 5, 6, 7) and edge components (3; 8, 9, 10, 11), wherein water is fed into, withdrawn from, or stored on the node components (2; 4, 5, 6, 7) and the water is transported between the node components (2; 4, 5, 6, 7) via the edge components (3; 8, 9, 10, 11), wherein a number of the edge components (9, 10, 11) can be controlled in terms of their flow behaviour for the water and are controlled in accordance with a control map which contains a temporal sequence of controls for the controllable edge component (9, 10, 11), wherein the control map is determined based on boundary conditions which include a minimum fill level (h min) for each water-storing node component, which minimum fill level must not be undershot, and wherein the control map is optimised based on a target function in which, for each controllable edge component (9, 10, 11), the number of controls is multiplied by a cost rate for an energy consumption and/or wear of the respective edge component (9, 10, 11) and the total across all controllable edge components (9, 10, 11) is then formed, characterised in that a safety fill level (h sec) which exceeds the minimum fill level (h min) is defined in each case for each of the water-storing node components and that the target function for each water-storing node component is supplemented by a further summand in the form of a further cost rate dependant on the fill level in each case, which is minimal at a fill level which corresponds to the safety fill level (h sec) and is maximal at a fill level which corresponds to the minimum fill level (h min), wherein the control map is determined in a processing facility of a control apparatus on the basis of the boundary conditions, wherein the control apparatus comprises an interface for controlling the controllable edge components (9, 10, 11), and wherein the control map can be transferred in parts or completely to the control apparatus for controlling the water supply network. wherein a number of the edge components (9, 10, 11) can be controlled in terms of their flow behaviour for the water and are controlled in accordance with a control map which contains a temporal sequence of controls for the controllable edge component (9, 10, 11), wherein the control map is determined based on boundary conditions which include a minimum fill level (h min) for each water-storing node component, which minimum fill level must not be undershot, and wherein the control map is optimised based on a target function in which, for each controllable edge component (9, 10, 11), the number of controls is multiplied by a cost rate for an energy consumption and/or wear of the respective edge component (9, 10, 11) and the total across all controllable edge components (9, 10, 11) is then formed, characterised in that a safety fill level (h sec) which exceeds the minimum fill level (h min) is defined in each case for each of the water-storing node components and that the target function for each water-storing node component is supplemented by a further summand in the form of a further cost rate dependant on the fill level in each case, which is minimal at a fill level which corresponds to the safety fill level (h sec) and is maximal at a fill level which corresponds to the minimum fill level (h min), wherein the control map is determined in a processing facility of a control apparatus on the basis of the boundary conditions, wherein the control apparatus comprises an interface for controlling the controllable edge components (9, 10, 11), and wherein the control map can be transferred in parts or completely to the control apparatus for controlling the water supply network.