September 1, 2026
This week’s photo is courtesy of Roscoe Moss Company- Los Angeles, CA
Safety Focus
Part 2 of 4: Housekeeping, Slips, Trips, and Falls: Spot It
Yesterday we said the same-level fall is the one that most often causes injury. Today we learn to see it before an incident happens. These falls are common because the hazards do not look like hazards. They look like a normal, busy site. So walk your site and read the ground the way you read a formation log, one section at a time.
Start with what is on the surface. Trip hazards are anything that breaks up a clean walking path: air and water hoses run across the work area, welding leads and power cords, pipe wrenches and hand tools left where they fell, cuttings piles, pallets, and the lip of a mat board. If a boot can catch it, it is a trip hazard.
Now read the surface itself. Slip hazards are anything that takes the grip out of the ground: drilling fluid and mud tracked across the pad, spilled fuel or hydraulic oil, ice and frost in the early hours, wet steel decking and rig steps, and loose gravel. OSHA names these plainly. Its walking and working surfaces rule for general industry, 1910.22(a)(3), says surfaces are kept free of hazards such as leaks, spills, snow, and ice.
Pay special attention to the transitions, because that is where footing changes without warning: stepping off the rig onto the ground, the top and bottom of stairs and ladders, the edge of the mud pit, and any spot where a clean surface meets a slick one.
One hazard is easy to miss: the one you have walked past all day. Familiarity turns a hose across the path into part of the scenery. The fix is to look with fresh eyes, or better, have a coworker walk your path and point at what you have stopped seeing.
Key Takeaways
• Trip hazards break up the walking path: hoses, cords, tools, cuttings, pallets, mat edges.
• Slip hazards remove grip: mud, fuel and oil spills, ice, wet steel.
• Watch the transitions: on and off the rig, stair tops and bottoms, pit edges, anywhere footing changes.
• Familiar hazards fade into the background, so walk the paths again with fresh eyes during the shift.
Sources:
Knowledge Share
Part 1 of 4: Aquifer Hydraulics and Math, Part 2: Why It Matters
Today we define the four numbers and put the two working formulas on the table.
Transmissivity, or T, is how much water an aquifer can move through its full saturated thickness. It ties directly to K: transmissivity equals hydraulic conductivity times saturated thickness, T = K times b. If K is the quality of the material, T is that quality multiplied by how much of it you have. Common units are square feet per day or gallons per day per foot.
Storativity, or S, also called the storage coefficient, is how much water the aquifer releases from storage for each foot the water level drops, per unit of area. It is a plain number with no units. In a confined aquifer it is very small, often between 0.00005 and 0.005, because the water you get comes from the water expanding and the aquifer compressing, not from draining pores.
Specific yield, or Sy, is the unconfined version of that same idea: the share of water that actually drains out of the pores by gravity. For clean sand and gravel it is commonly 0.2 to 0.3. In an unconfined aquifer, storativity is essentially the specific yield.
Specific capacity is your field measure of well performance: the pumping rate divided by the drawdown it produces, Q divided by s, in gallons per minute per foot of drawdown. A well that gives 300 gpm at 30 feet of drawdown has a specific capacity of 10 gpm per foot.
FORMULA SPOTLIGHT
Transmissivity: T = K x b
K = hydraulic conductivity, b = saturated thickness. Units ft²/day or gpd/ft.
Specific capacity: Q / s
Q = pumping rate (gpm), s = drawdown (ft). Units gpm/ft.
Note: S and Sy are dimensionless. Watch units on T; ft²/day and gpd/ft are not interchangeable.
What this means for your next design: T tells you what the aquifer can deliver; specific capacity tells you what this particular well is delivering. They are related but not the same number, and Wednesday we pull both straight off a pumping test.
Sources:
Recommended Print References:
• Handbook of Ground Water Development- Roscoe Moss Company
• Groundwater & Wells, Third Edition- Edited by Robert J. Sterrett, Johnson Screens
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