compute_highway_drainage_channel

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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_end_area_earthworks. Highway / surface-water drainage channel installation per BS EN 1433 + SHW Cl. 511-514 + HD 33/16. Discriminates between five UK channel product classifications via the channel_type enum (linear_polymer_concrete — ACO-pattern; linear_concrete — Charcon-pattern precast; slot_drain — narrow-slot recessed; combined_kerb_drainage — Beany/Safeticurb integrated unit per SHW Cl. 514; steel_grated_channel — heavy-duty stainless/galvanised). Plus parallel discriminators on two further WorkCategory entries: outfall_type on CHANNEL_OUTFALL (end / branch / side), silt_box_type on CHANNEL_SILT_BOX (standard / heavy-duty / deep-sump). The MMHW Series 500 _highway_drainage_channel handler is the platform's FOURTH 2D-banded handler — code `500.8.{t}.{d}` bands by channel_type (5 bands) AND depth_class (4 bands). 5×4 = 20-cell grid. SMM7 routes to R12 (Drainage below ground) — SECOND highway L1 family outside Section Q after S39 lighting → V41. Example params: channel_depth_mm=100 mm (50–1500), channel_length_m=50 m (1–500), outfall_count=1 nr (0–20). Example call: {"params": {"channel_depth_mm": 100, "channel_length_m": 50, "outfall_count": 1}, "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).