compute_hard_material_in_trench

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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. Linear extra-over measurement of hard material encountered during drainage trench excavation. Discriminates between natural rock (CESMM4 E.6 / NRM2 5.6.1 / MMHW 500.6.1 / SMM7 R12.6.1) and artificial hard material — buried concrete / masonry / obstructions (CESMM4 E.7 / NRM2 5.6.2 / MMHW 500.6.2 / SMM7 R12.6.2). The platform's first dual-quantity WorkItem: carries both length_m and volume_m3 so CESMM4/NRM2 (m³) and MMHW/SMM7 (m) each render with their correct unit per the standards' rules. Eight variant presets cover both hard-material types × four depth bands. SMM7 R12 deems trench excavation (including hard material) included in the pipe-run rate — the SMM7 handler emits a zero-priceable annotated line for tender transparency (third use of the deemed-included extra-over annotation pattern). Closes the drainage_ancillaries L2 leaf at 4/4 members. Sibling assemblies: connection_to_existing (S32), ditch (S33), pipework_testing (S33). Example params: length_m=10 m (0.5–500), max_depth_m=1.5 m (0.3–10), trench_width_m=0.7 m (0.3–3). Example call: {"params": {"length_m": 10, "max_depth_m": 1.5, "trench_width_m": 0.7}, "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).