{"id":"storm-manhole","version":"0.4.0","classification":{"uniformat":"G3030"},"names":["Storm manhole"],"aliases":["storm maintenance hole"],"service_life":{"median_years":50,"range_years":[50,60],"range_basis":"source_spread"},"pm_tasks":[{"task":"Inspect frame and top slab","frequency":"P1Y","reference":"TSPWG Manual 3-260-03.04-6 Inspection of Pavement Drainage Systems","url":"https://www.wbdg.org/FFC/DOD/STC/tspwg_m_3-260-03_04-6.pdf","page":10,"checklist":"Table 2-1 Inspection Schedule for Catch Basins, Manholes, Handholes, and Drop Inlets"},{"task":"Inspect structural condition","frequency":"P1Y","reference":"TSPWG Manual 3-260-03.04-6 Inspection of Pavement Drainage Systems","url":"https://www.wbdg.org/FFC/DOD/STC/tspwg_m_3-260-03_04-6.pdf","page":10,"checklist":"Table 2-1 Inspection Schedule for Catch Basins, Manholes, Handholes, and Drop Inlets"},{"task":"Inspect ladder","frequency":"P1Y","reference":"TSPWG Manual 3-260-03.04-6 Inspection of Pavement Drainage Systems","url":"https://www.wbdg.org/FFC/DOD/STC/tspwg_m_3-260-03_04-6.pdf","page":10,"checklist":"Table 2-1 Inspection Schedule for Catch Basins, Manholes, Handholes, and Drop Inlets"}],"basis":[{"type":"public_document","life_type":"accounting","title":"Greater Napanee: By-law 2012-11, Tangible Capital Asset Policy, Appendix B Asset Useful Lives","url":"https://greaternapanee.civicweb.net/document/45679","page":17,"label":"Storm Sewer System: Manholes","years":50,"note":"Capital asset policy (amortization period). Compared with an image of the cited page."},{"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":16,"label":"Storm Sewers - 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":"Severn: By-law 2019-04, Corporate Policy Manual: Tangible Capital Asset Policy, Useful Life Guide","url":"https://severn.civicweb.net/document/10628/","page":403,"label":"Infrastructure - Water & Sewer - Storm Manhole","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":"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":"B","sample_size":null},"open_questions":["Every source here is a published planning, design or accounting life. None is observed replacement data."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/storm-manhole","versioned_url":"https://unfinished.one/c/storm-manhole/v/0.4.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Storm manhole, v0.4.0. https://unfinished.one/c/storm-manhole/v/0.4.0"}