compute_counterfort_wall

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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_cantilever_wall. In-situ reinforced concrete counterfort retaining wall. Discrete RC counterforts on the retained face enhance moment capacity, making the wall economic for 4-10m retained heights (above cantilever-economic range, below anchored-wall range). Includes base slab, thin curtain wall, counterforts at configurable centres, drainage, and backfill. Eight VARIANT_PRESETS exercise the 'one parameter form, eight variants, four standards' moat #1 claim. Routes via wall_type='counterfort' attribute discrimination: CESMM4 F.6.3, NRM2 11.3.3, MMHW 1700.4.2 (SHW Cl. 1704), SMM7 E10.3.2. Example params: stem_height=5 m (3–12), curtain_thickness=0.35 m (0.2–0.6), toe_length=0.6 m (0–3). Example call: {"params": {"stem_height": 5, "curtain_thickness": 0.35, "toe_length": 0.6}, "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). Pass `freeboard` (clearance below the wall top, m) instead of the retained-height field to set the retained fill by clearance — the engine back-calculates it as stem − freeboard. Supplying both is rejected.