There has also been concern over the destruction of wetlands in parts of Colombo amid fast development especially in the Southern part of the capital.
Seneviratne who is in charge of a World Bank funded section said wetlands under the project will be preserved.
"We very concerned about wetlands and how we should protect wetlands," Seneviratne said.
"Wetlands are very very important for the city. They create a lot of value addition to the city, in flood control, water quality improvement and bio-diversity.
"We wanted to protect our wetlands and therefore we are creating a wetland park that is to educate children and others."
He said a strategic wetland management plan has also been designed with Simpson, for the metro Colombo region. Simpson had helped with a wetland park in Baddegana, he said.
Sri Lanka's Urban Development Authority has dug up several marshy areas in Colombo to expand water retention.
Leisure areas created around the such as the Water's Edge in Kotte has been popular with residents.Seneviratne also said the two 'beach parks' will be set up in the north and south Colombo.