Managing Water Sustainably to Slow Desertification

Unsustainable water use is a primary driver of desertification: excessive extraction, wasteful irrigation, and poor planning lower water tables and strip soil of moisture and vegetation. Slowing and reversing this process requires coordinated actions across technologies, on‑farm management, and policy. The following practical measures are feasible for semi‑arid and arid regions.

Irrigation methods that cut water loss

Adopt micro‑irrigation (drip or subsurface drip) where possible — these systems deliver water directly to the root zone and typically reduce applied water by 30–70% versus surface flood irrigation. Use sprinkler systems only with scheduling based on crop needs and wind conditions. Eliminate or minimize furrow/flood irrigation on degraded soils unless paired with soil improvement and precise scheduling.

Soil and crop practices to increase water productivity

Switch to drought‑tolerant and low‑evapotranspiration crops (millets, sorghum, pulses, native perennial grasses) in place of water‑intensive crops in vulnerable basins. Increase soil organic matter through cover crops, mulching, and reduced tillage to improve infiltration and water retention. Match planting dates to rainfall patterns and use crop rotations that lower total seasonal water demand.

Scheduling, monitoring and demand management

Implement irrigation scheduling based on evapotranspiration (ET) estimates or simple soil‑moisture probes rather than fixed calendars. Use remote sensing or local ET tools where available for field‑scale decisions. Meter agricultural water use where feasible to detect waste and target efficiency investments.

Managed aquifer recharge and rainwater harvesting

Capture episodic surface water and storm flows for recharge using methods like infiltration basins, check dams, recharge wells, and on‑farm AgMAR (flooding fields to promote infiltration). Rainwater harvesting — rooftop systems, micro‑catchments, and small ponds — reduces pressure on groundwater and supports dry‑season needs. Design recharge projects with water‑quality safeguards to avoid contaminating aquifers.

Wastewater reuse and circular water

Treat and reuse municipal and agricultural runoff for irrigation where safe; treated wastewater can supply consistent water while reducing freshwater withdrawals. Prioritize fit‑for‑purpose treatment standards and safeguard public health and soils from salinization.

Policy and institutional levers

Reform incentives that encourage over‑extraction: replace poorly targeted power or water subsidies with volumetric pricing, time‑of‑use tariffs, or conditional subsidies for efficient technologies. Support community groundwater governance (local water budgets, collective monitoring, and rules) to manage shared aquifers. Offer technical assistance and co‑financing for on‑farm efficiency upgrades and managed recharge projects.

Integrated basin planning

Manage surface and groundwater together using basin‑scale water accounting, allocation rules, and scenario planning that incorporate climate variability. Protect recharge zones from development and restore degraded riparian and wetland areas to improve natural infiltration.

Low‑cost actions for smallholders

Promote low‑cost water‑saving practices: mulching, zai pits or demi‑lune microcatchments, trenching to capture runoff, solar‑powered drip kits, and communal water‑sharing schemes. Provide training and demonstration plots to accelerate adoption.

Monitoring, evaluation and adaptive management

Track groundwater levels, pumping rates, and soil moisture trends; combine local monitoring with satellite data where possible. Use monitored results to iteratively adjust allocation rules, recharge investments, and crop support programs.

Combining on‑farm efficiency, managed recharge, crop and soil changes, and policy reform addresses both demand and supply sides of unsustainable water use — the integrated approach that most effectively slows desertification.

Sources

• Smart and sustainable water management: policy, technology, and innovation pathways (Springer; 2025-10-23)
• Sustainable Agricultural Water Systems Research (USDA ARS) — project summary (USDA Agricultural Research Service; 2021-01-01; Official source)