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Uplift Pressure

Calculates the bilinear uplift pressure distribution beneath a concrete gravity dam using the simplified method from USACE EM 1110-2-2200. Computes pressures at the upstream face, drainage gallery, and downstream face, then integrates the trapezoidal distribution to obtain total uplift force per unit length for sliding and overturning stability checks.

inputs

5 fields

context

4 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

5 inputs to 4 scored outputs

  • headwater_depth_m

    float

    Headwater depth (hydraulic head) upstream of the dam

    1 to 80m

  • tailwater_depth_m

    float

    Tailwater depth (hydraulic head) downstream of the dam

    0 to 20m

  • base_width_m

    float

    Total base width of the dam from upstream to downstream face

    3 to 80m

  • drain_distance_m

    float

    Distance from the upstream face to the drainage gallery line

    1 to 25m

  • drain_efficiency_pct

    floatfrom archetypehidden in hard

    Drainage gallery efficiency as a percentage (0 = no drain, 100 = full relief)

    0 to 100%
upstream_pressure_kpatol 0.03

Uplift pressure at the upstream face P_upstream (kPa)

drain_pressure_kpatol 0.03

Uplift pressure at the drain line P_drain (kPa)

downstream_pressure_kpatol 0.03

Uplift pressure at the downstream face P_downstream (kPa)

total_uplift_force_kn_mtol 0.03

Total uplift force per unit length of dam U (kN/m)

visibility contract

Difficulty Ladder

all_giveneasy

Small weir scenario, all parameters given including drain efficiency

all fields visible
all_givenmedium

All parameters given, wider range of dam types and operating conditions

all fields visible
partialhard

Drain efficiency hidden; agent must estimate from structure type and site context

drain_efficiency_pct

scenario bands

Archetype Atlas

small_weir

2 contexts

Small weir or low-head diversion structure on alluvial foundation

headwater_depth_m1 to 4
tailwater_depth_m0 to 1.5
base_width_m3 to 8
drain_distance_m1 to 2.5

rural-irrigation-weir / creek-crossing-diversion

medium_gravity_dam

2 contexts

Medium-height concrete gravity dam with foundation drainage gallery

headwater_depth_m10 to 30
tailwater_depth_m1 to 6
base_width_m15 to 35
drain_distance_m3 to 8

regional-water-supply-dam / hydropower-gravity-dam

large_flood_dam

2 contexts

Large concrete gravity dam designed for flood control and water storage

headwater_depth_m30 to 70
tailwater_depth_m3 to 15
base_width_m40 to 80
drain_distance_m8 to 20

major-flood-control-dam / multi-purpose-reservoir-dam

run_of_river_barrage

2 contexts

Run-of-river barrage with low head differential and gated spillway

headwater_depth_m3 to 10
tailwater_depth_m0.5 to 5
base_width_m6 to 20
drain_distance_m2 to 5

river-barrage-navigation / tidal-barrage-estuary

rendered task

Generation Preview

regional-water-supply-dam-medium-gravity-dam-preview

difficulty
hard
visibility
partial
archetype
medium_gravity_dam
site context
regional-water-supply-dam
instruction excerptuplift-pressure_calc.py

visible fields

  • headwater_depth_m10 to 30 m
  • tailwater_depth_m1 to 6 m
  • base_width_m15 to 35 m
  • drain_distance_m3 to 8 m

withheld schema

drain_efficiency_pctupstream_pressure_kpadrain_pressure_kpadownstream_pressure_kpatotal_uplift_force_kn_m
Medium-height concrete gravity dam with foundation drainage gallery. regional-water-supply-dam. Required outputs: upstream_pressure_kpa, drain_pressure_kpa, downstream_pressure_kpa, total_uplift_force_kn_m