Water Quality Awareness 101 37 | P a g e 16.1.2 Solutions Hazard identification and risk assessment practices undertaken in consultation with persons that have suitable knowledge and expertise in drinking water supply management and operation Ensure that tanks are suitably secured to prevent unauthorised access, including the input/ingress of materials from a natural or introduced source (suitably sized vent mesh) Check tanks regularly for maintenance and security, particularly after storm events (e.g. defective rotating vents or roof sheeting detachment) Install/retrofit hatches that do not allow debris and contaminates to enter the tank when they are both opened and closed Ensure suitable seals exist around tank roof areas, platforms, entry hatches, vents and other openings Ensure that fittings/features (e.g. davits, solar panels, aerials, lighting and security equipment) are positioned so that they do not attract birds to roost and defecate around hatches and other openings Install guttering (if required) that is easily cleaned and prevents debris ingress or rainwater drainage overflowing into the tank Check that drainage control points on the roof and platform areas are properly connected and sealed on the underside Use materials that can endure the humid and moist environment that they will be exposed to without degradation (chlorine is also an oxidant and will attack poorly protected metals) Ensure renovations, such as additional pipework and cabling installations, do not compromise the sealing integrity or vermin/bird proofing of the tank Outlet penetrations and foot valves should be located above the tank floor area, with sufficient stand-off space to prevent sediment accumulation being drawn into the downstream pipework Use directional nozzles on inlets, or common inlet/outlet pipework, to avoid sediment disturbance and to promote more effective blending of water within the tank Develop standard design specifications that have undergone a HAZOP review