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Flap Gate Headloss

Calculates energy loss through flap gates (tide gates / non-return valves) installed on stormwater outfalls using the orifice equation h = V^2/(2gCd^2). Determines the discharge coefficient from gate type, looks up unseating head from pipe diameter, and computes the effective capacity reduction compared to an open pipe. Used in drainage design to verify that outfall losses remain within acceptable limits for the catchment.

inputs

4 fields

context

4 archetypes

engine

both

outputs

4 scored fields

contract fields

Parameter Map

4 inputs to 4 scored outputs

  • pipe_diameter_mm

    enum

    Nominal pipe diameter at the outfall

    150225300375450600750900+1

  • flow_velocity_m_per_s

    float

    Mean flow velocity in the outfall pipe V

    0.3 to 4m/s

  • gate_type

    enumfrom archetypehidden in hard

    Flap gate hinge configuration

    side_hingedtop_hingedduckbill

  • upstream_head_m

    float

    Upstream head driving flow through the gate

    0.1 to 3m
headloss_mtol 0.05

Energy loss through the flap gate (m)

unseating_head_mtol 0.01

Minimum head to open the gate against its own weight (m)

capacity_reduction_percenttol 0.03

Effective capacity reduction compared to open pipe (%)

discharge_coefficienttol 0.03

Discharge coefficient Cd for the gate type

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given, common suburban gate and pipe size

all fields visible
all_givenmedium

All parameters given, any gate type and pipe size

all fields visible
partialhard

Gate type hidden, agent must infer from site description

gate_type

scenario bands

Archetype Atlas

suburban_stormwater

2 contexts

Suburban stormwater outfall with side-hinged flap gate

pipe_diameter_mm300, 375, 450, 600
flow_velocity_m_per_s0.5 to 2
upstream_head_m0.2 to 1.5
gate_typeside_hinged

sydney-suburban-outfall / brisbane-creek-outfall

tidal_outfall

2 contexts

Tidal outfall with top-hinged flap gate to prevent saltwater intrusion

pipe_diameter_mm450, 600, 750, 900, 1200
flow_velocity_m_per_s0.8 to 3
upstream_head_m0.3 to 2.5
gate_typetop_hinged

melbourne-tidal-creek / gold-coast-canal-outfall

small_lot_drainage

2 contexts

Small lot or car park drainage outfall with duckbill elastomeric valve

pipe_diameter_mm150, 225, 300
flow_velocity_m_per_s0.3 to 1.5
upstream_head_m0.1 to 0.8
gate_typeduckbill

perth-carpark-outfall / adelaide-lot-drain

trunk_drainage

2 contexts

Trunk stormwater outfall with heavy-duty top-hinged flap gate

pipe_diameter_mm750, 900, 1200
flow_velocity_m_per_s1 to 4
upstream_head_m0.5 to 3
gate_typetop_hinged

darwin-trunk-outfall / cairns-coastal-outfall

rendered task

Generation Preview

sydney-suburban-outfall-suburban-stormwater-preview

difficulty
hard
visibility
partial
archetype
suburban_stormwater
site context
sydney-suburban-outfall
instruction excerptflap-gate-headloss_calc.py

visible fields

  • pipe_diameter_mm300 mm
  • flow_velocity_m_per_s0.5 to 2 m/s
  • upstream_head_m0.2 to 1.5 m

withheld schema

gate_typeheadloss_munseating_head_mcapacity_reduction_percentdischarge_coefficient
Suburban stormwater outfall with side-hinged flap gate. sydney-suburban-outfall. Required outputs: headloss_m, unseating_head_m, capacity_reduction_percent, discharge_coefficient