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built templateoutfall-hydraulicsboth

Outfall Submergence Check

Determines the percentage of time a stormwater or wastewater outfall is submerged by tidal waters under present-day conditions and a future sea level rise scenario. Uses a sinusoidal tide model h(t) = MSL + A sin(2 pi t / T) with a closed-form solution for the submerged fraction, then converts to hours per day. Applicable to coastal outfall feasibility assessments per MfE Coastal Hazards Guidance 2024 and Australian coastal design practice.

inputs

5 fields

context

4 archetypes

engine

both

outputs

5 scored fields

contract fields

Parameter Map

5 inputs to 5 scored outputs

  • outfall_invert_level_m

    float

    Outfall pipe invert level relative to datum (m AHD or m CD)

    -1 to 1.5m AHD

  • mean_sea_level_m

    float

    Present-day mean sea level relative to datum

    -0.2 to 0.5m AHD

  • tidal_amplitude_m

    float

    Tidal amplitude (half the spring tidal range), A = (HAT - LAT) / 2

    0.2 to 4m

  • sea_level_rise_m

    float

    Projected sea level rise for the design planning horizon

    0.1 to 1.2m

  • tidal_period_hours

    floatfrom archetypehidden in hard

    Tidal period (typically 12.42 hours for semi-diurnal M2 constituent)

    6 to 25hours
present_submergence_percenttol 1

Percentage of time outfall is submerged under present-day conditions

future_submergence_percenttol 1

Percentage of time outfall is submerged under future sea level conditions

present_hours_submerged_per_daytol 0.25

Hours per day the outfall is submerged (present-day)

future_hours_submerged_per_daytol 0.25

Hours per day the outfall is submerged (future)

submergence_increase_percenttol 1

Absolute increase in submergence percentage from SLR

visibility contract

Difficulty Ladder

all_giveneasy

Small tidal range, all parameters given — straightforward substitution into closed-form formula

all fields visible
all_givenmedium

Larger tidal range with all parameters given — same formula, wider parameter spread

all fields visible
partialhard

Tidal period hidden — agent must recognise semi-diurnal or diurnal regime from site description

tidal_period_hours

scenario bands

Archetype Atlas

micro_tidal_estuary

3 contexts

Micro-tidal sheltered estuary with small tidal range (< 1 m amplitude)

tidal_amplitude_m0.2 to 0.5
tidal_period_hours12 to 12.5

sydney-harbour-estuary / auckland-waitemata-harbour / hobart-derwent-estuary

meso_tidal_coast

3 contexts

Meso-tidal open coast with moderate tidal range (1-2 m amplitude)

tidal_amplitude_m0.5 to 1
tidal_period_hours12.2 to 12.5

gold-coast-broadwater / wellington-harbour-outfall / newcastle-hunter-river

macro_tidal_port

3 contexts

Macro-tidal port or river mouth with large tidal range (> 2 m amplitude)

tidal_amplitude_m1.5 to 4
tidal_period_hours12.3 to 12.5

darwin-harbour-outfall / broome-roebuck-bay / gladstone-harbour-discharge

diurnal_gulf

3 contexts

Diurnal tidal regime with ~24 hour period (Gulf of Carpentaria type)

tidal_amplitude_m0.5 to 1.5
tidal_period_hours23 to 25

karumba-gulf-outfall / weipa-port-discharge / gove-peninsula-outfall

rendered task

Generation Preview

sydney-harbour-estuary-micro-tidal-estuary-preview

difficulty
hard
visibility
partial
archetype
micro_tidal_estuary
site context
sydney-harbour-estuary
instruction excerptoutfall-submergence-check_calc.py

visible fields

  • outfall_invert_level_m-1 to 1.5 m AHD
  • mean_sea_level_m-0.2 to 0.5 m AHD
  • tidal_amplitude_m0.2 to 0.5 m
  • sea_level_rise_m0.1 to 1.2 m

withheld schema

tidal_period_hourspresent_submergence_percentfuture_submergence_percentpresent_hours_submerged_per_dayfuture_hours_submerged_per_daysubmergence_increase_percent
Micro-tidal sheltered estuary with small tidal range (< 1 m amplitude). sydney-harbour-estuary. Required outputs: present_submergence_percent, future_submergence_percent, present_hours_submerged_per_day, future_hours_submerged_per_day, submergence_increase_percent