Protesters will face a wet reception if they try to camp overnight at an inner-city Melbourne park, Victoria Police say.
Assistant Commissioner Luke Cornelius says about 2000 police will keep an eye on climate protests planned throughout this week in the city.
There are also reports some protesters might try to camp overnight at Carlton Gardens, north of the CBD.
But the City of Melbourne will not allow overnight camping.
"If camping occurs, we will support City of Melbourne by-laws officers in having those camping sites taken down and moving (on) individuals," Mr Cornelius told 3AW.
"The City of Melbourne have told me they're putting the sprinklers on ... people will find themselves getting very wet.
"They're not like water cannon but grass and our parks and gardens can always do with a bit of water."
Following arrests at a CBD protest on Friday, there was another environment rally on Monday morning at the corner of Bourke and Spring streets.
Mr Cornelius said the protesters had health department approval but noted the police resources being diverted to the events.
"It is a huge opportunity cost for community safety," he said.
Opposition police spokesman David Southwick said officers were being taken off routine duties to "babysit" protesters.
"Why is it that we can have protesters effectively take over our city, whereas we can't have an Anzac Day parade," he told reporters on Monday.
"It just does not make sense."
