Pupils and staff were evacuated from Tipton Green Junior School, on Monday afternoon, after gallons of water was sent gushing onto Park Lane West.
The water reached six classrooms, alongside several other rooms, and destroyed a pathway to the school.
For safety reasons, the school has been closed since the flood.
Pupils in Year 5 and 6 will return tomorrow, however students in Year 3 and 4 won't return until Monday as their classrooms have been damaged by the water.
A Sandwell Council spokesman said: "Year Three and Four students aren't expected back yet as their part of the building has been affected."
A message on the school's website said: "We are pleased to say that school will be open for Years 5 and 6 from tomorrow and for Years 3 and 4 from Monday.
"Year 4 parents - we would like to invite you to a meeting to be held on Friday at 2.30pm to discuss temporary arrangements for Year 4 children.
"This will be held at Silvertrees (school), please enter via the dome entrance. Thank you for your patience and understanding through this difficult period."
The torrent of water caused chaos in the surrounding area and caused the partial collapse of a house on Park Lane West.
Other homes were flooded, with houses affected on Park Lane West and Baker Street. Firefighters had to carry out evacuations.
Electric, heating and fresh water supplies were also affected.
Pupils and staff were evacuated from Tipton Green Primary School, based on Manor Road, alongside Silvertrees Academy, based on Silvertrees Road. The latter school returned to service on Tuesday.
Tipton Green's headteacher David Rowe said after the evacuation: “I want to thank children, staff and parents who were all very calm throughout the school being evacuated. I'd also like to thank our neighbouring school Silvertrees Academy for their help during the evacuation.
“Quick-thinking staff reacted swiftly to barricade doors to stop water from seeping underneath to the corridors. Staff also had time to move objects that were on the floor to stop them from being damaged.”
He added: “We feel very fortunate that the damage to the school was much less than we feared."
Disruption will continue this week with Park Lane West set to be closed until October 25 as repair works and a clean-up operation continues.
South Staffs Water said its ground crews will remain on site for the rest of this week to repair the road surface.
South Staffs Water has been approached for an update.
Parents at Tipton Green will be notified if the school partially reopens tomorrow by text message, and details will also be posted on www.sandwell.gov.uk