This free software provides sufficient local evapotranspiration data for the United States and Canada.  Access data from the closest or most climate-appropriate location. 

The NCDC site is useful for researching local climate information such as data for rainwater harvesting calculations, and it also includes links to state climate offices.

This nonprofit organization focuses on promoting products that efficiently use water in irrigation applications.

CIT is an independent research and testing facility that provides information to designers, manufacturers, and users of irrigation equipment.

The clearinghouse includes articles, reference materials, and papers on all forms of water efficiency.

ARCSA was founded to promote rainwater catchment systems in the United States.  The ARCSA website provides regional resources, publications, suppliers, and membership information. 

This is the organization that sets lighting standards.  The IES also works directly with ASHRAE to develop energy standards.

This is a case study for the effects of daylighting on productivity in schools.  Prepared by Heschong Mahone Group.

This is a study exploring the relationship of daylighting and other design features on human psychological well being.  By Judith Heerwagen -
J.H. Heerwagen & Associates, Inc.

This is a case study for the effects of daylighting on productivity in schools.  Prepared by Heschong Mahone Group for the California Energy Commission.