{"id":"sanitary-manhole","version":"0.3.0","classification":{"uniformat":"G3020"},"names":["Sanitary manhole"],"aliases":["sewer manhole","maintenance hole"],"service_life":{"median_years":60,"range_years":[50,75],"range_basis":"source_spread"},"pm_tasks":[{"task":"Open manhole and inspect interior","frequency":"P3M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":141,"checklist":"Table 18-1 Drain and vent system"},{"task":"Remove debris and sediment and flush manhole","frequency":"P3M","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":141,"checklist":"Table 18-1 Drain and vent system"}],"basis":[{"type":"public_document","life_type":"accounting","title":"Kenora: AF-6-1 Tangible Capital Asset Policy (By-law 34-2026)","url":"https://listview.kenora.ca/Files/City%20Policy%20Manual/Administration%20and%20Finance/AF-6-1%20Tangible%20Capital%20Asset.pdf","page":18,"label":"Wastewater Mains - Manholes","years":50,"note":"Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page."},{"type":"public_document","life_type":"accounting","title":"Kingston: Tangible Capital Assets Policy","url":"https://cityofkingston.ca/media/pljd1bhs/finance_policy_tangible-capital-asset-policy.pdf","page":16,"label":"Sewer Utility - Sewer - manholes","years":75,"note":"Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page."},{"type":"public_document","life_type":"accounting","title":"Prince Edward: FIN-12 Tangible Capital Assets Policy","url":"https://www.thecounty.ca/wp-content/uploads/2023/09/FIN-12-Tangible-Capital-Asset-Policy.pdf","page":34,"label":"Sewer - Manholes (Pooled)","years":60,"note":"Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page."},{"type":"public_document","life_type":"design","title":"Design standards: employer's requirements – Technical Manual (ER-DFE-XX-XX-T-X-0201, revision A-C01)","by":"Department for Education (England)","url":"https://assets.publishing.service.gov.uk/media/6971f649d8adeaf266040501/ER-DFE-XX-XX-T-X-0201-Technical_Manual-A-C01.pdf","page":222,"code":"5.2.4","label":"Below ground drainage and manholes: 60 years","years":60,"note":"Printed page 222. On-site below-ground drainage and manholes of a school, not a municipal network; foul or surface water not stated. Minimum life expectancy (design requirement) for DfE-funded school buildings. Minimum design requirements placed on contractors for school buildings, not observed replacement ages. Section 5.1.4 (sanitaryware) refers to CIBSE Guide M Appendix 12.A1 'in general'."},{"type":"public_document","life_type":"accounting","title":"General depreciation rates (IR265), July 2021","by":"Inland Revenue (Te Tari Taake), New Zealand","url":"https://www.ird.govt.nz/-/media/project/ir/home/documents/forms-and-guides/ir200---ir299/ir265/ir265-2021.pdf","page":46,"code":"BUIL","label":"Manholes","years":50,"note":"Printed page 46. Manholes, service not stated. Buildings and structures category. Printed DV 4%, SL 3%. Tax depreciation lives set by the Commissioner of Inland Revenue for New Zealand income tax, not engineering or asset-management lives; they are banded and often short (e.g. reticulation piping 25 years). The July 2021 edition was the newest PDF reachable; the online Depreciation Rate Finder may hold later determinations."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Every source here is a published planning, design or accounting life. None is observed replacement data.","Some maintenance intervals come from TM 5-692-1, an Army manual for mission-critical (C4ISR) facilities; they may be tighter than typical commercial practice."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/sanitary-manhole","versioned_url":"https://unfinished.one/c/sanitary-manhole/v/0.3.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Sanitary manhole, v0.3.0. https://unfinished.one/c/sanitary-manhole/v/0.3.0"}