compute_headwall_attenuation_outlet

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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_headwall. Controlled attenuation outlet: precast concrete headwall plus outlet-control ironmongery (orifice plate, optional flap valve, weir overflow, penstock) and downstream scour protection. 2nd use of the bundle-with-shared-envelope pattern (template: combined_services_trench S14). Composes headwall_precast for the structural unit and bedding; emits ironmongery items as CONTRACTOR_INSTALL_PC_SUPPLY by default (3rd commercially significant PC-supply emitter after utility_chamber and utility_kiosk_base). Scour protection extended to three variants: rock armour, gabion mattress, concrete apron. Example params: orifice_diameter_mm=150 mm (20–600), orifice_target_discharge_ls=5 l/s (0.1–200), flap_valve_size_mm=0 mm (0–1200). Example call: {"params": {"orifice_diameter_mm": 150, "orifice_target_discharge_ls": 5, "flap_valve_size_mm": 0}, "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).