Mr Plodprasop was replying to a question in parliament directed to the prime minister by Democrat MP Thana Chirawinij about the government's overreaction to the sandbags the Bangkok Metropolitan Administration stuffed into drains on Srinakarin Road and other areas to redirect water flow.
Mr Thana said the BMA had laid sandbags at 18 spots to block water from flowing into flood-prone areas on many roads, including Ramkhamhaeng, Srinakarin, Rama 9 and Phetchaburi.
The MP asked why Mr Plodprasop, who is WFMC chairman, had not invited representatives of the city administration to explain instead of confusing the public by making accusations through the media and causing problems for the BMA, since MR Sukhumbhand Paribatra, the Bangkok governor, is also a WFMC member.
Mr Thana said this method of floodwater control was used worldwide and the WFMC knew this.
Mr Plodprasop rose to reply on behalf of the prime minister. He said he had no intention of confusing people but had to look into the BMA's actions and then order it to remove the sandbags after seeing that its action had affected the overall water drainage system.
An appointment had been made for the WFMC to meet with the BMA Friday at 2pm, as suggested by the prime minister and opposition leader Abhisit Vejjajiva, he said.
He would apologise to the BMA and follow its advice if it was proved there was a misunderstanding on his part, saying he did not comprehend the BMA's methods.
He did not think it was right to obstruct the water flow, or to construct monkey cheeks, in the middle of the city.
If he was proved correct, the BMA must remove the sandbags or he would take more positive action, Mr Plodprasop said.
Mr Abhisit, in an interview with a cable television channel, said both the WFMC and the BMA should not have made the issue political.
He urged the two sides to look into the technical aspects of the issue.
If they disagreed, they should stick to their respective authority, but should not cause problems for the people and state officials.
Mr Abhisit said the last time they met, Mr Plodprasop told him both sides should talk and solve problems together, but some Pheu Thai MPs tried to spread the news that the government and the BMA were in conflict for political gain.