* Pass/fail means the automated subset of the cited profile, not full statutory certification.
Roof cells:
dVᵢ/dt = qrain,ᵢ + ΣQj→i − ΣQi→j − Qnormal,external,ᵢ − Qoverflow,ᵢ
Normal drainage:
Qnormal,external = verified project input
(no gravity/siphonic network calculation in this tool)
Lateral sheet flow:
q = b/n · h^(5/3) · sqrt(|Δη|/L)
η = z0 − w + h
Structural feedback:
qwater = ρg h
EI′ wₓₓₓₓ = qwater (one-way)
D ∇⁴w = qwater (two-way)
zroof = z0 − w
Tank:
dVₜ/dt = Qto_tank − Qsewer − Qreuse − Qoverflow
Circular emergency opening:
Q = Cd·N·∫ b(y)√(2g(H−y))dy
Rectangular emergency opening:
Q = Cd·N·b·(2/3)√(2g)·[H^(3/2) − (H−a)₊^(3/2)]
Wall rain:
Rwall = Rh · k · U/vfall · max(0, −dwind·nwall)
Length (m)Width (m)Parapet (mm)Depression storage (mm)Roof runoff coefficientRoof slope X (mm/m)Roof slope Y (mm/m)Hydraulic cell size (m)Sheet-flow Manning nStructural modelDeflection at uniform 1 kPa (mm)Geometry update interval (s)Structural modesUser deflection alert (mm)Reference intensity (l/s·ha)Reference duration (min)Intensity × referenceDuration × referenceHorizontal rain (l/s·ha)Duration (min)Time step (s)Wind speed (m/s)Wind from (°)Drop fall speed (m/s)Wind-to-drop couplingScenarioCode profileObjectsScene objectsRoofStructural pondingReference / code eventApplied eventWind-driven rainObject inspectorStorm mass balanceChecksCode comparison · same roofSource basisPublic-source checks are a subset of the cited rules, not a complete compliance certificate.Choose a tool → move the ghost → click to place. Esc cancels placement. Select does not move objects; use Move / G.Eye hides an object only in 3D; lock prevents accidental transforms.Calibrate the elastic model by the roof’s maximum deflection under a uniform 1 kPa load. This changes hydraulic geometry; it does not verify member strength or buckling.Example preset — replace rainfall with project data.Hydraulic gridLearning modeNormal drainage hydraulics is outside this tool. Enter the verified available flow from the separate gravity/siphonic drainage design.DrainCore equationsHydrographWind exposure rose3D catchment sceneMax roof depthRoof waterPASSCloneDeleteFitCancel