compute_french_drain

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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. Perforated land drain in a granular-filled trench with non-woven filter geotextile wrap. Composes the bedding primitive at Class S geometry (full granular envelope) with three additions: perforated carrier, filter geotextile wrap, and optional top seal. Renders cleanly across CESMM4 / NRM2 / MMHW (Series 500 filter drain) and SMM7. Example params: pipe_internal_diameter_mm=150 mm (80–600), pipe_wall_thickness_mm=25 mm (5–80), drain_length=50 m (1–500). Example call: {"params": {"pipe_internal_diameter_mm": 150, "pipe_wall_thickness_mm": 25, "drain_length": 50}, "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).