compute_edge_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. Highway pavement edge drain per HD 33/16. Perforated carrier in a granular-filled trench with filter geotextile wrap; optional top separator under the pavement build-up. Highway-specific defaults: Type B filter aggregate, 200 g/m² geotextile, supported excavation. Headline standard mapping: MMHW 500.7 (filter drain with perforated pipe). Renders cleanly across all four standards with HA 40/01 references. Example params: pipe_internal_diameter_mm=150 mm (80–300), pipe_wall_thickness_mm=25 mm (5–50), drain_length=100 m (1–1000). Example call: {"params": {"pipe_internal_diameter_mm": 150, "pipe_wall_thickness_mm": 25, "drain_length": 100}, "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).