The IBC and ASCE 7 require quantifiable data on subsurface water flow for deep foundations and retaining structures, especially in the variable Missourian stratigraphy. Our field permeability testing in Kansas City delivers that data directly from the limestone, shale, and alluvial deposits beneath the metro. Using the Lefranc method in soil horizons and the Lugeon test in fractured bedrock, we measure hydraulic conductivity where laboratory tests fall short. The Pennsylvanian-aged bedrock here, with its interbedded limestones and shales, demands a testing approach that captures secondary porosity and joint flow. For a city with 500,000 residents in a region shaped by the Missouri and Kansas Rivers, ignoring in-situ permeability invites hydrostatic surprises during excavation. We integrate these tests with in-situ permeability analysis to provide the design parameters your geotechnical engineer needs.
In Kansas City's interbedded limestone and shale, a single Lugeon test can reveal more about foundation drainage than a dozen laboratory permeability trials.
Our approach and scope
Local considerations
Kansas City’s climate oscillates between spring deluges dumping over 5 inches in a single month and late-summer drought, making groundwater levels anything but static. A foundation designed on dry-season water readings can face buoyancy forces and softening of shale subgrades when the water table rebounds. The risk multiplies in areas like the West Bottoms, built on thick compressible alluvium where artesian conditions can develop behind limestone ledges. Ignoring a Lugeon test in the Argentine limestone or the Winterset member can leave a deep excavation vulnerable to inflows exceeding 50 gpm, blowing the budget on emergency dewatering. Our testing quantifies these risks before the first shovelful of earth moves, giving contractors in Kansas City the data to design reliable sump and well-point systems that handle the seasonal extremes of the Missouri River basin.
Video overview
Relevant standards
ASCE 7-22 (Minimum Design Loads), IBC 2021 Section 1803 (Geotechnical Investigations), ASTM D6391 (Field Permeability by Two-Part Borehole Technique)
Associated technical services
Lefranc Permeability Test
Variable-head test conducted in soil and highly weathered rock. Used in Kansas City's alluvial deposits and residuum to determine hydraulic conductivity for shallow foundation drainage and infiltration analysis.
Lugeon Packer Test
Multiple-pressure packer test in competent rock. Applied in the limestone and sandstone formations common to Kansas City's Pennsylvanian bedrock for tunnel, dam, and deep excavation projects.
Typical parameters
Quick answers
How much does a Lefranc or Lugeon test cost in Kansas City?
Depending on borehole depth, number of test intervals, and rig mobilization, a field permeability test program in the Kansas City area typically ranges from US$660 to US$960 per test zone. This covers the packer assembly, water supply, and pressure data acquisition. Mobilization to sites in Johnson or Clay County may adjust the final figure.
When is a Lugeon test required instead of a laboratory permeability test?
A Lugeon test becomes necessary when the rock mass is fractured, jointed, or contains solution channels. In Kansas City's Bethany Falls limestone, lab tests on intact core plugs severely underestimate mass permeability. The Lugeon test directly measures the hydraulic conductivity of the in-situ rock mass, including discontinuities that control groundwater flow.
How do you select the test intervals for a Lugeon test in Kansas City?
We select intervals based on the borehole log, RQD, and fracture spacing. Typically, a 3 to 5-meter interval is isolated with a pneumatic packer. In the Kansas City sequence, we target the contacts between limestone and shale units, as well as any zones of lost circulation noted during drilling. Each interval undergoes five pressure steps to assess flow regime.
What is the difference between the Lefranc and Lugeon methods?
The Lefranc test is designed for soil and granular materials, using a slotted casing section. The Lugeon test is strictly for rock, employing an inflatable packer to seal off a borehole section. In a single Kansas City borehole, you might run Lefranc tests through the alluvial overburden and switch to Lugeon tests once you hit the competent Winterset limestone.