October 14, 2026
This week’s photo is courtesy of- Hydro Resources- Rocky Mountain, Fort Lupton, CO, USA.
Safety Focus
Part 3 of 4: Working Near Water
OSHA 1926.106 is only four paragraphs long, and each one is a control you can check on site today.
Life jackets. Workers near water where drowning is a danger get U.S. Coast Guard-approved life jackets or buoyant work vests. They only work if they are worn and buckled. A vest on the truck seat protects no one.
Inspection. The standard says vests are inspected "prior to and after each use" for defects that affect strength or buoyancy, and "defective units shall not be used." Look for torn shells, broken buckles, waterlogged foam, and rotted straps. Pull bad units out of service that day.
Ring buoys. "Ring buoys with at least 90 feet of line shall be provided and readily available for emergency rescue operations," with no more than 200 feet between buoys. "Readily available" means mounted where someone can grab it in seconds, not coiled in a toolbox.
Skiff. "At least one lifesaving skiff shall be immediately available at locations where employees are working over or adjacent to water." Plan for it before mobilizing.
Beyond the standard, three field practices make the gear work:
• Set back from the edge. Keep the rig, pipe, and parked trucks well back from any bank that shows the warning signs from Tuesday.
• Never work the edge alone (site practice, not an OSHA requirement). One person works, one person watches with the ring buoy in reach.
• Reach or throw, do not go. A rescuer who jumps in faces the same cold shock gasp as the victim. Reach with a pole, throw the buoy, and stay on the bank.
Key Takeaways:
• Wear the vest and buckle it. Inspect it before and after each use.
• Ring buoys need at least 90 feet of line and no more than 200 feet of spacing.
• Reach or throw. Do not jump in after someone.
Sources:
• National Weather Service: Cold Water Hazards and Safety
Knowledge Share
Part 3 of 4: Groundwater and Surface Water
Two field estimates come out of this week. One for interference between wells, one for how fast a well starts taking water from a stream.
Interference. Say a new irrigation well causes 4.0 feet of drawdown at a neighbor's domestic well after a season of pumping. The neighbor's own pumping causes 2.5 feet. By superposition, the total is 6.5 feet (about 2.0 meters). If that pump intake sits only 5 feet below the static water level, the water can now drop below the intake, and the pump starts pulling air. That is how interference complaints start.
Stream depletion timing. USGS Circular 1376 explains that the timing of streamflow depletion is controlled by the distance from the well to the stream and the hydraulic diffusivity of the aquifer. Hydraulic diffusivity is the ratio of transmissivity (T) to storage (S). It describes how fast a pressure change spreads through the aquifer. The report describes a stream depletion factor, introduced by Jenkins in 1968, that combines them:
SDF = a² x S / T
a = perpendicular distance from well to stream (ft); S = specific yield; T = transmissivity (ft²/day)
SDF has units of time (days). It is the time it takes for the stream to supply about 28 percent of the water pumped. It is a timescale, not a countdown to the first effect. A low SDF means depletion builds quickly.
Example: a water-table aquifer with S = 0.1 and T = 10,000 ft²/day. A well 500 feet from the stream gives SDF = (500² x 0.1) / 10,000 = 2.5 days. Move it to 2,000 feet and SDF = 40 days. Four times the distance, a timescale sixteen times longer. Notice what distance buys you: time, not immunity.
What this means for your operation:
Before you set a pump near other wells, add up the drawdowns. Before you set a well near a stream, run the SDF. Treat both as screening checks. Jenkins notes that field conditions never fully meet the ideal assumptions, so the inputs need real data before a siting decision.
Sources:
Recommended Print References:
• Hydraulics of Wells: American Society of Civil Engineers
• Handbook of Ground Water Development- Roscoe Moss Company
• Groundwater & Wells, Third Edition- Edited by Robert J. Sterrett, Johnson Screens
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