The scheme includes a number of measures to protect the environment by improving wildlife habitats, tree cover and watercourses, the county council said.
"This morning it became apparent that several ordinary watercourses in Cardiff and Rhondda Cynon Taff had flooded a significant number of properties, " said a spokesman.
The UN Convention on the Law of Non-Navigational Uses of International Watercourses provides that special attention be given to "the requirements of vital human needs".
He suggested directly to neighbours who had similar seasonal watercourses near their homes that they try building dams themselves and he advised them how to do so.
Before it can be released back into the nearby watercourses it has to meet stringent standards, including maximum levels of ammonia, heavy metals and any chemicals that might cause oxygen depletion.
Dr Reaney said that in urban areas, where melted snow runs directly off roads and pavements into drains, snowmen would make more of a difference than in fields where it would take longer for the water to filter into watercourses.