A 50mm drenching across Goulburn in just four hours kept emergency services on the hop on Friday afternoon.
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The downpour started at 5pm and sent Goulburn SES crews scurrying to more than 50 jobs. Water inundated roads, contributing to several minor accidents in the city's south.
The council has also closed roads due to the flooding, which was mainly confined to Goulburn.
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Goulburn SES unit controller Daryl Skinner said two crews had attended up to 66 call-outs throughout the day, mostly involving water inundation in houses through roofs, guttering and doorways. Some businesses were also affected. The majority of jobs came after 5pm when torrential rain hit.
"We have one crew filling sandbags and we're hoping to save some properties from inundation through doors and garages," Mr Skinner said on Friday night.
Businesses were also affected. Water flowed through the Tattersall's Hotel's back door while up on Hume Street, Back to the Arcade announced it was closing temporarily due to 50mm of rain through the premises.
"Due to the state of the drainage, we expect more over the coming days," a social media post stated.
Two SES crews had completed 31 of the 66 jobs by about 9.30pm when the rain had tapered off.
There hadn't been any flood rescues but a team was on standby.
Mr Skinner said water was rising on the Mulwaree Ponds at Lansdowne Bridge but was sitting at 1.6 metres, still 60cm below inundation level.
Similarly, the Wollondilly River at Marsden Weir was under one metre at 9.30pm. It soon spilled across the wall.
The Wollondilly at Murrays Flat just north of Goulburn was also "holding steady."
"The rain has all hit Goulburn and is flowing downstream," Mr Skinner said.
Goulburn SES was also at the ready to assist its Crookwell counterparts with a steady flow of jobs.
By 11pm Friday, Goulburn had recorded 61.2mm at the airport from 9am. It came on top of 30mm in the 24 hours to 9am Friday.
During Friday afternoon's downpour, water was flooding the city's creeks, waterways and roads, particularly on Hume Street where police patrolled and attended several minor accidents.
The council was compiling a full list of road closures late on Friday night. Goulburn SES announced that May Street bridge was closed and Towrang bridge was also likely to shut.
Over at Eastgrove, residents watched as water overflowed a detention pond on a planned 28-lot residential subdivision at 99 May Street.
The area, below Rocky Hill, has been cleared of a large vegetation tract in preparation for building but several heavy storms in recent months have washed sediment and water down the slope on to May Street and the wetlands below.
Friends of Goulburn Swamplands (FROGS) president Heather West said the vegetation removal had severely eroded topsoil which ended up in the stormwater drains and the wetland ponds.
"It is disappointing for all the FROGS Landcare volunteers to see their hard work undermined by developers who want to maximise profits at the expense of the environment," Mrs West said.
Council general manager Warwick Bennett said in November that a stop-work order and infringement notice were previously issued to the developer.
However since then they had more than complied with the order's conditions, including construction of three retention dams, trenching, sediment control fencing around the boundary fence lines and installation of further controls surrounding stormwater drains and infrastructure, he said.
But on Friday evening, nearby resident Judith Ferneley told The Post the flooding was "worse than last time (November)."
"It looks like the dam will collapse," she said before the 7pm heavy rainfall.
"The first downpour contained it but later it was overflowing the wall. It's a mess."
Contractors had pumped out the dam into the wetlands earlier that day ahead of the forecast rain.
Ms Ferneley said she was unhappy with the volume of runoff following heavy storms in recent months.
"At this point it will be destroyed," she said of the area.
"I think the only thing they can do is put in vegetation and drainage to better manage the site. You can't put back what was there."
Meantime, some 250 premises in and around Goulburn had power cut due to the storm.
It is the third heavy storm in three months, including one on November 25 and another on December 11.
Goulburn airport has received 116mm this month. Last year's rainfall totalled 1049mm.
The Bureau is forecasting 28 degrees with an 80 per cent chance of up to 5mm of rain on Saturday.
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