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Roadway Spread

Determines the width of water spread across a roadway pavement and curb flow depth using the HEC-22 Manning's equation for triangular gutter sections: T = (Q*n / (K_u * Sx^(5/3) * S_L^(1/2)))^(3/8). Used for inlet spacing design and pavement drainage adequacy checks to ensure roadway safety during design storms.

inputs

4 fields

context

4 archetypes

engine

both

outputs

2 scored fields

contract fields

Parameter Map

4 inputs to 2 scored outputs

  • gutter_flow_m3_s

    float

    Design gutter flow rate Q

    0.001 to 0.2m³/s

  • cross_slope_pct

    float

    Roadway cross-slope Sx (percentage)

    1 to 6%

  • longitudinal_slope_pct

    float

    Longitudinal road gradient S_L (percentage)

    0.3 to 10%

  • mannings_n

    floatfrom archetypehidden in hard

    Manning's roughness coefficient n for the pavement surface

    0.011 to 0.02
spread_width_mtol 0.03

Width of water spread on the roadway T (m)

curb_depth_mtol 0.03

Flow depth at the curb face d (m)

visibility contract

Difficulty Ladder

all_giveneasy

Small urban road, all parameters given, straightforward spread calculation

all fields visible
all_givenmedium

Arterial or highway with higher flows, all parameters given

all fields visible
partialhard

Manning's n hidden, agent must infer roughness from road surface description

mannings_n

scenario bands

Archetype Atlas

urban_local_road

3 contexts

Urban local road with steep cross-slope and smooth asphalt pavement

gutter_flow_m3_s0.005 to 0.04
cross_slope_pct2.5 to 4
longitudinal_slope_pct0.5 to 3
mannings_n0.013 to 0.016

sydney-suburban-street / melbourne-residential-road / brisbane-local-access

suburban_collector

3 contexts

Suburban collector road with moderate cross-slope and aged asphalt surface

gutter_flow_m3_s0.01 to 0.08
cross_slope_pct2 to 3
longitudinal_slope_pct0.5 to 5
mannings_n0.014 to 0.018

perth-suburban-collector / adelaide-ring-route / canberra-distributor-road

arterial_road

3 contexts

Major arterial road with standard cross-slope and concrete gutter channel

gutter_flow_m3_s0.02 to 0.12
cross_slope_pct1.5 to 2.5
longitudinal_slope_pct0.5 to 6
mannings_n0.012 to 0.016

sydney-arterial-corridor / melbourne-main-road / gold-coast-boulevard

highway_shoulder

3 contexts

Highway shoulder with shallow cross-slope and textured asphalt surface

gutter_flow_m3_s0.03 to 0.2
cross_slope_pct1 to 2
longitudinal_slope_pct0.3 to 8
mannings_n0.014 to 0.02

bruce-highway-shoulder / hume-motorway-verge / pacific-highway-shoulder

rendered task

Generation Preview

sydney-suburban-street-urban-local-road-preview

difficulty
hard
visibility
partial
archetype
urban_local_road
site context
sydney-suburban-street
instruction excerptroadway-spread_calc.py

visible fields

  • gutter_flow_m3_s0.005 to 0.04 m³/s
  • cross_slope_pct2.5 to 4 %
  • longitudinal_slope_pct0.5 to 3 %

withheld schema

mannings_nspread_width_mcurb_depth_m
Urban local road with steep cross-slope and smooth asphalt pavement. sydney-suburban-street. Required outputs: spread_width_m, curb_depth_m