New catchment maps released by the state government on Thursday reveal Brisbane State High School’s catchment zone could be cut by 25 per cent to manage pressure on its rising enrolments.

The draft maps show the streets in South Brisbane where students would no longer be eligible for direct entry to the popular school once the neighbouring high-rise school in Dutton Park opens in 2021.

The maps and the enrolment management plan are out for public consultation until September 30.

The school’s current catchment stretches through South Brisbane and West End and out to Dutton Park.

Parents in the BSHS catchment zone have long held concerns about how the school would cope with hundreds of extra students due to the rapid increase in apartments in West End and South Brisbane.

Each year, the school selects 1000 students – 50 per cent on academic merit, 40 per cent on sports merit and 10 per cent on cultural merit – from outside its catchment, contributing to a 3200 student population.

Demand for places is so high the school employed an investigator in May to weed out families rorting the catchment system to allow their children to attend the school.

The move came after the school received reports of parents buying investment properties in the area and pretending to live there.

Current BSHS students living in the proposed catchment zone for the new Inner City South State Secondary College will be allowed to remain enrolled at BSHS for the duration of their studies.

Their siblings will still be able to enrol under transitional arrangements, but it’s unclear for how long.

Meanwhile, families with primary school children living in a street which appears on both catchment maps as they currently stand, can choose to enrol their child at either school.

Education Minister Grace Grace confirmed the government had secured additional land on Gladstone Road near the existing Ecosciences Precinct at Dutton Park.

“The site is currently used by Multiple Sclerosis Queensland, who will be relocating to new premises,” Ms Grace said.

“The newly acquired site will be the main building platform for the new school and provides greater access to green space - a key theme raised during the community consultation process.

“This land also offers a clear line of sight to the new school’s tertiary education partner, the University of Queensland, which is just across the river via the Eleanor Schonell Bridge.”

Deputy Premier and MP for South Brisbane Jackie Trad dismissed concerns that the consultation period of 24 days was too short.

“We announced a new secondary high school for inner city south in last year’s budget, so there have been lots of consultation milestones along the way,” Ms Trad said.

“We have had a community conversation around this amazing new investment in our local community for more than a year now."