Spatial asynchrony in environmental and economic benefits of stream restoration

Abstract

Stream restoration is widely used to mitigate the degradation of urban stream channels, protect infrastructure, and reduce sediment and nutrient loadings to receiving waterbodies. Stabilizing and revegetating riparian areas can also provide recreational opportunities and amenities, and improve quality of life for nearby residents. In this project, we developed indices of an environmental benefit (potential nitrate load reduction, a priority in the Chesapeake Bay watershed) and economic benefit (household willingness to pay, WTP) of stream restoration for all low order stream reaches in three main watersheds in the Baltimore metro region. We found spatial asynchrony of these benefits such that their spatial patterns were negatively correlated. Stream restoration in denser urban, less wealthy neighborhoods have high WTP, but low potential nitrate load reduction, while suburban and exurban, wealthy neighborhoods have the reverse trend. The spatial asynchrony raises challenges for decision makers to balance economic efficiency, social equity, and specific environmental goals of stream restoration programs.

Household willingness to pay for stream restoration on private and public land: Evidence from the Baltimore metropolitan region

“…A spatially explicit hydrologic model is needed to analyze the complex relationships between existing nutrient conditions and those after stream restoration. As an example, Zhang et al (2022) examine how nitrate reduction and aggregate community-level benefits of stream restoration vary across the Baltimore metro region, where the economic WTP analysis relies on the household survey data presented here.…”