compute_parapet

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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. Bridge / structural-deck parapet installation per BS 6779-1 + BS EN 1317-2 + SHW Cl. 408. Discriminates between four UK parapet system classifications via the parapet_type enum (pedestrian_only per BS 7818; vehicle_p1_p2 — low-containment BS EN 1317-2; vehicle_h1_h2_h3 — higher-containment; combined_pedestrian_vehicle — composite design). Plus parallel discriminators on two further WorkCategory entries: same parapet_type on PARAPET_POST, transition_type on PARAPET_TRANSITION (to_vrs / to_abutment / expansion_joint). The MMHW Series 400 _parapet handler is the platform's SEVENTH 1D-banded handler — code `400.4.1.{c}` bands by containment_level (4 bands per BS EN 1317-2). 1D choice is disciplined — second principled rejection of forced 2D banding (after S38 road_marking). LAUNCH-COMPLETING 45TH ASSEMBLY — opens highway_bridge_edge L2 leaf, closing the highway suite at 5/5 populated leaves and the platform at 45/45 launch target. SMM7 routes BACK to Q40 (sibling slot to VRS at Q40.5) — preserves UK trade reality. Example params: parapet_height_mm=1100 mm (900–1800), parapet_length_m=25 m (1–2000), post_count=0 Nr (0–200). Example call: {"params": {"parapet_height_mm": 1100, "parapet_length_m": 25, "post_count": 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).