Testing Low-Tech Strategies for Stream Resilience in the Rio Grande Basin

Climate change is altering small headwater streams in the Rio Grande basin, placing an even greater strain on the already overallocated downstream water resources. These changes are mainly caused by shifts in snowpack quantity and melt timing. One solution to mitigate these effects on downstream water resources is to place cost-effective beaver dam analogs (BDAs) and plug ponds in upper watersheds where most surface water originates. These structures mimic natural processes by increasing water residence time, and potentially increasing stream baseflows which can provide stable water supply during dry periods, improve water quality, and sustain wildlife habitat. However, the effectiveness of BDAs and plug ponds in the Southwest has not yet been studied.

This project aims to address these unknowns about the effectiveness of BDAs to improve best management practices in the region. The project team will add sensors to monitoring sites in the Upper Rio Grande Watershed of northern New Mexico to continuously measure atmospheric and surface water quality and quantity where BDAs and plug ponds are used. These data will help the team determine how BDAs and plug ponds affect stream baseflow, water quality, and ecosystem functions like carbon sequestration, nitrogen cycling, and riparian habitat.

This project will produce best practices for BDA and plug pond location, size, and spatial density, providing critical guidance for watershed managers about the effectiveness of these low-cost, low-tech strategies for building watershed resilience. It will also identify which types of streams (for example, groundwater-dominated or precipitation-driven) respond best to BDAs and plug ponds, providing essential information for mitigating future water shortages and ensuring that communities retain access to clean water.