The organisers billed the Ruataniwha project as a "now or never" opportunity and said the meeting was a chance to dispel "misinformation" being spread about the scheme and the cost of water that would be delivered from the dam.
Mid Canterbury farmer Rab McDowell, a shareholder and chairman of that region's Barrhill Chertsey Irrigation scheme, said CHB farmers should not be daunted by the large financial numbers associated with committing to the scheme.
He said an established "rule of thumb" in Canterbury was that if farmers spent $1 million on irrigation infrastructure, their property values increased by $1.5 million to $2 million.
While the benefits of investing in irrigation were not seen in wet years, it proved vital in dry seasons because it provided security of production due to to having a reliable water source, Mr McDowell said.
North Otago grower Nick Webster also talked about the benefits of reliability from being involved in an irrigation scheme, including securing additional growing contracts.
Hawke's Bay sheep and beef farmer Arthur Rolands said he would take water from the Ruataniwha scheme to increase the amount of irrigation on his property because it opened up further options for land use.
Another CHB farmer, Irrigation NZ board member Hugh Ritchie, said he believed it was a "pretty simple decision" to sign up.
"We're a whole lot better off with water than without. The time is now, people."
The Ruataniwha scheme is being promoted by Hawke's Bay Regional Investment Company (HBRIC), the investment arm of Hawke's Bay Regional Council which has conditionally committed $80 million towards the $275 million project.
The council investment will not go ahead if HBRIC cannot convince farmers to sign up to take at least 40 million cubic metres of water from the scheme.