Benefits Toolkit

SPAW Field & Pond Hydrology Model

USDA Agricultural Research Service and Washington State University Department of Biological Systems Engineering

The SPAW (Soil-Plant-Air-Water) model simulates the daily hydrologic water budgets of agricultural landscapes with two connected modules, one for farm fields and one for impoundments such as wetland ponds, lagoons or reservoirs. The model was developed to understand and predict agricultural hydrology and its...


Stormwater management, Water body/groundwater recharge, Wetland

This straightforward calculator uses the inputs of produce type and planted area to determine the total pounds grown and market value of individual or multiple crops. Over 50 kinds of vegetables, fruits, and herbs are available in the drop-down menu. Calculations are based on default values for yield and price per...


Food production, Other economic, Food garden

Water Harvesting Calculator

Water Harvesting Solutions (Wahaso)

This tool estimates the volume of water required for toilet flushing in a building and compares it to the amount of water that a rainwater harvesting system could capture from roofs and parking lots. Inputs include: information on building occupancy, average rainfall, and roof and parking lot catchment areas....


Water conservation, Rainwater harvesting

National Stormwater Management Calculator

Center for Neighborhood Technology

This online tool compares predevelopment, conventional development, and development with Green Stormwater BMPs for a single site. Results include changes in total runoff volume, pervious area, and life cycle costs. Inputs include: site size, predevelopment land cover, post development land cover, and parameters for...


Stormwater management, Operations & maintenance savings, Bioretention, Green roof, Native Plants, Permeable paving, Rainwater harvesting, Trees

Recycling and Reusing Landscape Waste Cost Calculator

U.S. Environmental Protection Agency

This Microsoft Excel-basedĀ calculator estimates the cost and environmental benefits of four scenarios for handling hardscape and landscape wastes (concrete and asphalt, brick, lumber, and yard waste): (1) Reusing all waste possible on-site, recycling all waste possible that cannot be reused, and disposing of waste...


Water conservation, Energy use, Air quality, Carbon sequestration & avoidance, Waste reduction, Operations & maintenance savings, Other economic, Reused/recycled materials


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