The water authority says it is working with the Bureau of Meteorology and regional airspace reference panels with the Lachlan River already at moderate to major flood heights in some areas this week.

With the Water NSW website showing the dam at 104.9 per cent through the weekend, water spilled from the dam at a rate of up to 80GL a day, Tony Webber from Water NSW said.

Releases were scaled back to a rate of 50GL per day from midnight Sunday with inflows coming down to 30GL per day.

Cowra experienced moderate flooding, but by the time the waters combined with downstream tributaries Forbes was preparing for major flooding.

By Wednesday, the sun was shining and the water was flowing in to the dam at 10 gigalitres per day, with releases at 22 gigalitres per day.

Unfortunately, there's another wet weekend forecast.

With dam storage levels high, most catchments saturated and wetter than average weather conditions forecast by the Bureau for the near future, WaterNSW advises it is monitoring rain forecasts and making releases to increase storage capacity to capture inflows as required.

The aim, Water NSW said on Wednesday, was to create at least three per cent airspace - bringing the dam down to 97 per cent - before the weekend.

Wyangala was at 101 per cent of capacity by Wednesday afternoon.

At that time the Bureau of Meteorology predicted Forbes - and Cowra upstream - had a 95 per cent chance of more rain this coming Sunday,

For Cowra that could start with five to 10mm Saturday and another 20 to 35mm Sunday; in Forbes it's more likely to be 3 to 8mm Saturday and anywhere from 10 to 25mm Sunday.

It would be devastating news for farmers who were ready to harvest a bumper season of crops.

Water has been spilling out onto rural properties, and is expected to submerge millions of dollars worth of crops - or at least make it too wet to get onto the paddocks to harves them.

"We are going to lose hectares and hectares of beautiful crops. That is really sad," Mayor Phyllis Miller told AAP.

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