compute_connection_to_existing

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Paid tier only. Calling this without an authenticated CivilQuants account returns TIER_INSUFFICIENT — sign up at https://civilquants.com/pricing or use the free-tier alternative compute_manhole. Enumerated extra-over connection of a new drainage carrier pipe into an existing asset: existing manhole / inspection chamber, existing sewer or drain (via saddle / wye / cut-in junction), or existing outfall / watercourse / surface system. Routes via CESMM4 I.7.1/2/3 (Class I §I.7 Pipework Ancillaries — Connections), NRM2 33.6.1/2/3, MMHW 500.5.1/2/3 (SHW Cl. 506 Connections to existing sewers, drains and service runs), SMM7 R12.4.1/2/3, with a bore-size digit suffix appended in all four. The connection_type attribute is the discriminator that routes to the right sub-code; the bore digit refines within. Six variant presets cover all three connection types × two characteristic bores. Unit: Nr. Opens the new `drainage_ancillaries` L2 leaf (reserved for ditch, hard-material extra-over, CCTV testing, etc. in future sessions). Sibling assembly: carrier_pipe_run — the S32 pair that delivers a complete tender drainage line. Example params: diameter_mm=225 mm (100–2400). Example call: {"params": {"diameter_mm": 225}, "standard": "MMHW"}. Omitted parameters use sensible engineering defaults. Pass deliverables=["xlsx","dxf","pdf"] (any subset) to also receive one-shot download URLs in the same call: Excel BoQ (both tiers, watermarked free) plus the dimensioned DXF (CAD) and PDF drawing sheets (paid tier).