Napier is being warned against rushing to flushing as one of the heaviest daily rainfalls in the city in recent history threatens to force waste water discharges into the Ahuriri Estuary.

The warning was issued via the Council's facebook page about 10.45am, saying there'd been over 100mm of rain overnight and another 64mm was forecast.

"Our wastewater system has been overloaded by over 24 hours of heavy rain," the post said. "If we all work together to reduce the amount of waste water we're producing, we hope to avoid an emergency discharge into the estuary."

"In order to prevent an emergency discharge from the network into Ahuriri estuary, Napier City Council asks that the community flush toilets only when necessary, and hold off using showers, dishwashers or washing machines if possible.

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"If an emergency discharge is carried out, this should prevent wastewater backing up and overflowing into city streets and properties.

"Toilets, showers, dishwashers and washing machines all drain into the city's wastewater network, which is also affected by infiltration of stormwater."

An NCC spokesperson said Hawke's Bay Regional Council has been informed of the situation.

"The region has had on average 100mm of rain overnight, and a further 60mm of rain is expected to fall through to 6pm tonight."

NERVOUS IN HAUMOANA

Homeowners are also nervously watching rising water in the Tukituki River in the coastal Hawke's Bay settlement of Haumoana.

A Hawke's Bay Regional Council spokeswoman said Hastings has received approximately 90mm of rain in the past 24 hours.

Hastings District councillor Ann Redstone said on Wednesday morning "houses down at the beginning of Haumoana Rd are under threat" due to the rising Tukituki River mouth.

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A Hawke's Bay Regional Council spokeswoman said the river mouth in Haumoana was "not blocked".

The Tukituki river mouth on Wednesday. Photo / Warren Buckland
The Tukituki river mouth on Wednesday. Photo / Warren Buckland

"There are big swells running which aren't allowing the river water to get out to sea."

She said said there was surface flooding on lawns around Haumoana Rd, but not a "huge risk" to homes.

There was also surface flooding on orchards around Raupare Stream in the Twyford area.

Flooding in a vineyard near Haumoana on Wednesday. Photo / Warren Buckland
Flooding in a vineyard near Haumoana on Wednesday. Photo / Warren Buckland

The stream feeds the Clive River.

She said the engineering staff had been working hard overnight to manage control gates and clean the pump stations.

MetService has issued a heavy rain warning for the region, with streams and rivers rising rapidly.

Surface flooding and slips are also possible and driving conditions may be hazardous.

The warning is in place until 5.00pm Wednesday.

BEDROOM FLOODS

Fire and emergency services attended two rain-related incidents early this morning.

The first one occurred at 4.43am on Wednesday at Chambers St, Havelock North.

A spokeswoman said that a bedroom in the house was flooded because of the rain.

"Water was coming in from the roof," she said.

Firefighters also helped homeowners on Kirkwood Rd in Flaxmere with a leaky roof.

Hastings Intermediate School told students they could stay home because of the bad weather.

Braving kite-surfing in stormy weather near Waitangi Regional Park. Photo / Paul Taylor.
Braving kite-surfing in stormy weather near Waitangi Regional Park. Photo / Paul Taylor.

"As a consequence of major flooding in the school playground and more rain forecast, we recommend where possible that students do not attend school today," a post on Facebook said.

"Students that do attend should wear gumboots! To be clear...the school is open but if alternative arrangements can be made today then that would be wise."

FLIGHTS DELAYED

The weather was also causing havoc for flights in and out of Napier.

An Air NZ spokeswoman said a number of flights in and out of Napier were delayed on Wednesday due to low cloud at Napier Airport.

NZ5005 from Auckland to Napier was diverted to Palmerston North due to the low cloud.

Customers were accommodated on alternative services, the spokeswoman said.

ROADS CLOSED, SLIPS

Sustained wet weather across Hawke's Bay on Tuesday caused localised flooding, road closures and minor slips.

NZTA on Tuesday evening asked motorists to avoid travelling on SH2 near Tangoio and SH5 Napier-Taupo Rd if possible due to the number of reported slips.

When it rains, it pours. Hang on to your umbrellas Hawke's Bay the worst is yet to come. Photo / Paul Taylor.
When it rains, it pours. Hang on to your umbrellas Hawke's Bay the worst is yet to come. Photo / Paul Taylor.

They said that contractors had confirmed minor slips along SH5 Napier-Taupo Rd, and SH2 near Tangoio but were not significantly impacting the road and to only travel if necessary.

Flooding at Makahu Rd, near Puketitiri, 56km northwest of Napier, resulted in the closure of Makahu Rd ford on Tuesday until further notice.

MetService meteorologist Kyle Lee said on top of periods of heavy rain, thunderstorms were possible for the region.

For a warning criteria to be put into place there needs to be either 120mm of rainfall in a 24-hour period or the rainfall intensity needs to be 10mm in an hour, he said.

According to the Hawke's Bay Regional Council rainfall gauges, Napier CBD has had a total of 39mm of rainfall in the 24 hours to 9am.

A resident of Mary Doyle rest home, in Havelock North, recorded 78mms of rain in 24 hours as off of 8.30am this morning.

ARTS FESTIVAL ALL GO

In spite of the rain the opening night of the Hawke's Bay Arts Festival, on Tuesday night, went off with a bang.

Festival Director Pitsch Leiser said the rain didn't "dampen the spirit" of the attendees and was just a minor inconvenience.

"The site was a bit wet, but everyone was very supportive."

The opening night of LIMBO was sold out with 600 people inside the Victoria Speigel Tent.

With rain expected on Wednesday as well the festival organisers are fully prepared.

"The rain is not a problem. It's when it is really windy that we have issues," Leiser said.

REDUCE SPEED ON ROADS

Inspector Dean Clifford said people needed to think about whether they really needed to travel in Hawke's Bay on Wednesday and Thursday.

Debris and surface flooding were likely hazards and a reduced speed should be employed by drivers on almost every road.

Clifford also recommended drivers, including motocyclists and cyclists, keep their lights on while driving during the day, as a safety measure.

"We haven't had any problems yet, but wandering stock can be an issue in these conditions, particularly on our narrow rural roads."

HOW ARE THE VINES?

The belts of heavy rain may not have created any damage to the region's grape vines but they have set the scene for "plenty of work" according to winegrowers.

Mission Estate viticulturist Steve Wheeler said while the two days of rain had created plenty of surface water across nearby paddocks it had created no major issues for the vines.

"But it creates a bit more work for us as the grass and weeds will really grow so there will be lots of mowing."

Hawke's Bay Winegrowers chairman Michael Henley agreed.

"If we get a good patch of warm weather over the next week it's going to take off."

He had not heard of any major serious surface flooding across the region's vineyards at this stage, although with rain continuing to linger it was something of a wait and see situation.

The rain had arrived at a time when many viticulturists would have be considering beginning some irrigation.

"We would have started thinking about that," Wheeler said.

"Good little drink of water," was how Henley put it, adding that on the whole the vines, which were not yet fruiting, were sitting "pretty okay".

Wheeler said any surface water among vines tended to drain away quite quickly.