Worcester will stage an all-hurdles card on Sunday as parts of the chase track are not fit for racing.
The fixture was originally due to feature three contests over fences but clerk of the course Fergus Cameron has cancelled those races after the recent wet spell.
He said: "Parts of the track were under water until last weekend and areas are still waterlogged.
"We are forecast a further 32 millimetres of rain over the next couple of days so those areas are unlikely to recover in time.
"The line taken in hurdles races is on slightly higher ground and we are delighted with the way that has dried in recent days.
"Although rain is forecast, we do not anticipate any problems with the hurdles track at this stage."