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built templatehydraulic-calculationswith-tool

Open Channel Capacity

Computes flow area, wetted perimeter, hydraulic radius, velocity, discharge capacity, and Froude number for trapezoidal or rectangular open channels using Manning's equation V = (1/n)*R^(2/3)*S^(1/2). Used in drainage and flood conveyance design per HEC-22 and Australian Rainfall and Runoff (ARR) standards.

inputs

5 fields

context

5 archetypes

engine

with-tool

outputs

6 scored fields

contract fields

Parameter Map

5 inputs to 6 scored outputs

  • bottom_width_m

    float

    Channel bottom width b

    0.3 to 10m

  • flow_depth_m

    float

    Flow depth y

    0.1 to 5m

  • side_slope_z

    float

    Side slope ratio z (horizontal:vertical, 0 for rectangular)

    0 to 4-

  • mannings_n

    floatfrom archetypehidden in hard

    Manning's roughness coefficient n

    0.01 to 0.06

  • channel_slope_m_per_m

    float

    Longitudinal channel slope S

    0.0005 to 0.1m/m
flow_area_m2tol 0.03

Flow cross-sectional area A (m²)

wetted_perimeter_mtol 0.03

Wetted perimeter P (m)

hydraulic_radius_mtol 0.03

Hydraulic radius R (m)

flow_velocity_m_stol 0.03

Flow velocity V (m/s)

flow_capacity_m3_stol 0.03

Flow capacity Q (m³/s)

froude_numbertol 0.05

Froude number Fr (dimensionless)

visibility contract

Difficulty Ladder

all_giveneasy

Rectangular channel (z = 0), all parameters given

all fields visible
all_givenmedium

Trapezoidal channel, all parameters given

all fields visible
partialhard

Trapezoidal channel, roughness coefficient hidden

mannings_n

scenario bands

Archetype Atlas

concrete_lined

2 contexts

Concrete-lined trapezoidal channel

mannings_n0.012 to 0.018

brisbane-trunk-drainage / sydney-stormwater-channel

grassed_channel

2 contexts

Grassed or turfed drainage swale

mannings_n0.025 to 0.045

melbourne-suburban-swale / perth-bioretention-swale

riprap_lined

2 contexts

Riprap or rock-lined channel

mannings_n0.03 to 0.05

darwin-creek-stabilisation / cairns-erosion-control

natural_earth

2 contexts

Unlined natural earth channel

mannings_n0.02 to 0.035

adelaide-rural-drain / hobart-farm-channel

gabion_lined

2 contexts

Gabion-lined channel

mannings_n0.025 to 0.04

gold-coast-creek-works / townsville-flood-channel

rendered task

Generation Preview

brisbane-trunk-drainage-concrete-lined-preview

difficulty
hard
visibility
partial
archetype
concrete_lined
site context
brisbane-trunk-drainage
instruction excerptopen-channel-capacity_calc.py

visible fields

  • bottom_width_m0.3 to 10 m
  • flow_depth_m0.1 to 5 m
  • side_slope_z0 to 4 -
  • channel_slope_m_per_m0.0005 to 0.1 m/m

withheld schema

mannings_nflow_area_m2wetted_perimeter_mhydraulic_radius_mflow_velocity_m_sflow_capacity_m3_sfroude_number
Concrete-lined trapezoidal channel. brisbane-trunk-drainage. Required outputs: flow_area_m2, wetted_perimeter_m, hydraulic_radius_m, flow_velocity_m_s, flow_capacity_m3_s, froude_number