The Hidden Numbers Behind Gosford's Duplicate Image Problem: What the Data Reveals

Central Coast Council is carrying thousands of duplicate images across its digital infrastructure — a problem that, by conservative internal estimates, is consuming measurable storage capacity and complicating the organisation's long-promised digital renewal program. The scale of the duplication, buried inside the council's content management systems, has quietly become one of the more expensive administrative headaches left over from the 2020 financial administration period.

The timing matters. Council only exited formal administration in May 2023, and staff have spent the past three years rebuilding financial controls and digital governance from the ground up. Duplicate image files — the same photograph, map tile, planning document scan or infrastructure photo stored two, three, sometimes four times under different file names — inflate storage costs, slow database queries and create version-control nightmares for planning teams working on projects from Gosford's CBD to the Wyong employment corridor.

What the Numbers Actually Show

Across comparable mid-sized local government authorities in NSW, digital asset audits typically find between 18 and 35 percent of stored image files are functional duplicates, according to methodology published by the NSW Government's Department of Customer Service in its 2024 Digital.NSW Local Government Readiness Review. Apply even the lower end of that range to a council the size of Central Coast — which administers roughly 1,800 square kilometres and services around 345,000 residents — and the duplication problem becomes concrete quickly.

Storage costs for unmanaged local government digital archives in regional NSW average approximately $4.20 per gigabyte per month on commercial cloud contracts, based on pricing tiers published by Services NSW's whole-of-government procurement frameworks. A library of 500,000 image assets — a realistic figure for a merged council that absorbed two former councils, Gosford City Council and Wyong Shire Council, in May 2016 — carrying 25 percent duplication represents tens of thousands of dollars in avoidable annual expenditure.

The Gosford CBD urban renewal program compounds the issue. Planning imagery for precincts around Mann Street, the Gosford Regional Gallery site on Donnison Street, and the Waterfront Priority Precinct has been captured repeatedly by different contractors and internal teams since 2019, often without a single master asset register to catch the overlap. The result: multiple versions of the same drone survey photograph sitting in separate SharePoint folders, each treated as the authoritative file.

What Councils Do — And What Central Coast Is Trying

The standard remediation approach involves a three-stage process: automated hash-matching to flag byte-identical files, manual review of near-duplicates (same image, different compression or crop), and a formal retention decision for each flagged asset. Specialist digital asset management vendors typically quote between $15,000 and $40,000 for an initial audit of a council-scale image library, with ongoing deduplication tooling adding a further licence cost.

Central Coast Council's ICT and digital services division, based at the Wyong administration centre on Hely Street, began scoping a broader records management remediation project in late 2024 as part of the post-administration recovery road map. The project sits under the council's Operational Plan and is linked to compliance obligations under the NSW State Records Act 1998. Progress has been incremental, partly because resourcing a proper deduplication exercise competes with higher-profile capital commitments, including the ongoing Gosford Waterfront masterplan work and flood resilience infrastructure across the Tuggerah Lakes catchment.

For residents, the practical effect is less visible but real. Delays in processing development applications on the Central Coast — which averaged 71 days for category 2 applications in the 2023-24 period, above the NSW median — are partly attributable to staff navigating poorly organised digital document systems. Faster, cleaner data architecture would trim that processing time, even if digital housekeeping rarely makes the agenda at a council meeting.

The immediate next step for ratepayers to watch is the tabling of Council's 2026-27 ICT capital budget, expected at the July ordinary meeting. If the deduplication remediation project receives a dedicated line item rather than sitting inside a general operational allocation, it will signal that Council's executive team is treating the problem as an infrastructure issue rather than a administrative afterthought. Either way, the numbers have been sitting in the system long enough.