Kansas task force hears evidence that irrigation technology reduces withdrawals but not acreage

Kansas State University researchers told the Governor’s Water Task Force in Dodge City that adoption of modern irrigation systems and decision‑support technologies has produced measurable reductions in groundwater withdrawals while often preserving irrigated acreage and farm incomes.

Two K‑State presenters, Darren Rudnick, director of sustainable irrigation, and economist Micah (last name not given), summarized national and state-level data showing that moving from flood to center‑pivot irrigation and adding sensors, telemetry and soil‑moisture monitoring can lower water pumped per acre by roughly 3–20 percent, depending on region and technology. They stressed the distinction between the intensive margin (water applied per acre) and the extensive margin (number of acres irrigated), and said most observed declines are on the intensive margin.

The presenters told the task force that when irrigators convert from flood irrigation to center pivots, they typically see a near‑term drop in water withdrawals—with little or no immediate reduction in irrigated acres. Research summarized by the economists showed a roughly 10–20 percent drop in withdrawals soon after center‑pivot adoption in study areas; adoption of lower‑energy precision application (LEPA) and subsurface drip irrigation (SDI) produced smaller incremental gains but still net reductions in many comparisons. The presenters said older research suggesting efficiency gains cause more pumping (a “rebound”) did not hold up in newer analyses with Kansas well‑level data.

Rudnick described technology and management elements that influence whether efficiency gains translate into water savings: system uniformity (catch‑can and pressure tests), well/pumping plant alignment with distribution systems, decision support (ET models, crop/plant sensors, remote sensing) and education/mentoring. He said producer mentoring and human contact often account for a large share of adoption and water savings; technology alone is not a silver bullet. K‑State’s on‑farm TAPS demonstration program was cited as a tool for comparing management strategies and surfacing real‑world results.

Micah, the agricultural economist, framed water as a productive capital asset. He reported research using parcel sales and well records that finds irrigated land commands a premium (estimates shown in presentation: roughly $1,500 per acre change in land value where irrigation is lost in the datasets cited). That capitalization of irrigation value makes farmers reluctant to give up irrigated acres: when efficiencies lower the cost of pumping, many producers maintain acreage and reduce per‑acre pumping instead, reinforcing the importance of managing both margins if the policy goal is to reduce total withdrawals.

Both speakers flagged variability in impacts across Kansas. In western Kansas, where aquifer decline is greatest, reductions in applied depth have been observed without large acreage losses in some places. In wetter eastern areas, the dynamic differs and some new irrigation infrastructure has been installed for risk management in episodic drought years.

What this means: modern pivots, nozzle packages, SDI and decision‑support tools can reduce groundwater withdrawals, but those gains often show up as lower depth applied rather than fewer irrigated acres. Presenters recommended pairing technology investments with incentive or market mechanisms (multiyear allocations, water banks, compensation programs) and continuing producer education and mentoring so efficiency gains become conserved water instead of only lower cost of production.

Ending: Presenters told the task force they could provide more location‑specific estimates and urged continued investment in farm‑scale demonstrations, mentoring programs and improved data — including well‑level pumping records and coordinated monitoring — to measure whether efficiency gains deliver conservation at watershed scale.