Water conservation and management is increasingly becoming a worldwide survival issue due to accelerating water shortages, property development, and population growth, aging infrastructures, growing agricultural demands, a general warming trend, and the ever-increasing cost of and demand for natural water resources.

Rainwater Management Solutions is helping to lead the way to a brighter future for all of us. Below is a collection of rainwater harvesting resources for commercial application. If you need any help, give Rainwater Management Solutions a call.





The American Society of Plumbing Engineers (ASPE) is dedicated to promoting the plumbing engineering profession to increase career opportunities for our members as well as protecting the health of people around the world through the delivery of safe, sustainable drinking water and sanitation systems.


ARCSA/ASPE/ANSI 63-2013: Rainwater Catchment Systems

ARCSA/ASPE/ANSI 63-2013: Rainwater Catchment Systems, co-sponsored by IAPMO and NSF International, is designed to assist engineers, designers, plumbers, builders/developers, local government officials, and end users in safely implementing a rainwater catchment system using precipitation from rooftops and other hard, impervious surfaces for use for irrigation, laundry, hygiene, or even potable water applications if the appropriate treatment and materials have been certified for the specific end use.

ARCSA/ASPE/ANSI 78-2015: Stormwater Harvesting System Design for Direct End-Use Applications

This new plumbing engineering and design standard has been developed by a joint effort of the American Rainwater Catchment Systems Association (ARCSA) and the American Society of Plumbing Engineers (ASPE). The purpose of this Standard is to assist engineers, designers, plumbers, builders/developers, landscape and irrigation professionals, state and local government, and end users in implementing a stormwater harvesting system while protecting public health and safety.


National Stormwater Calculator

EPA’s National Stormwater Calculator (SWC) is a software application that estimates the annual amount of rainwater and frequency of runoff from a specific site.

Storm Water Management Model (SWMM)

EPA's Stormwater Management Model (SWMM) is used throughout the world for planning, analysis, and design related to stormwater runoff, combined and sanitary sewers, and other drainage systems.

Urban Waters Small Grants

Since the inception of the Urban Waters Small Grants Program in 2012, the program has awarded approximately $6.6 million in grants to 114 organizations across the country and Puerto Rico. The grants are competed and awarded every two years, with individual award amounts of up to $60,000.

Environmental Justice Grants

The Environmental Justice Small Grants Program supports and empowers communities working on solutions to local environmental and public health issues. The program is designed to help communities understand and address exposure to multiple environmental harms and risks.

National Center for Biotechnology Information

Sustainability assessment of agricultural rainwater harvesting

An assessment methodology to evaluate the sustainability of agricultural systems as applied to a southeastern U.S. river basin.

Pacific Northwest National Laboratory (PNNL)

Rainwater Harvesting State Regulations and Technical Resources

Pacific Northwest National Laboratory (PNNL) conducted in-depth research of state-level rainwater harvesting regulations for the Federal Energy Management Program (FEMP) to help federal agencies strategically identify locations conducive to rainwater harvesting projects.


Virginia Rainwater Harvesting Manual

A comprehensive guide to examining, designing and maintaining rainwater harvesting systems to abate stormwater runoff.


Fairfax County Rainwater Harvesting

There are many different types of systems available; the size, complexity, material and location of the RWHS will be based on the source and volume of stormwater runoff to be captured and how the water is to be used.