CK-12 Foundation
Ck 12: Earth Science: Water Distribution
[Free Registration/Login may be required to access all resource tools.] How water is distributed throughout the world.
University of California
University of California: Roman Building Technology and Architecture
This site offers information on Roman Engineering, Roman Baths, Roman Aqueducts, roads, bridges, buildings and concrete.
Other
Cdec: Snow Surveys
At this site from the California Cooperative Snow Surveys, you will learn the importance of snow to California. You will learn about the history and data collection of snow.
Curated OER
Wikipedia: National Historic Landmarks in California: Old Mission Dam
The first major irrigation project on the Pacific coast, this dam supplied water for milling and irrigation at the Mission San Diego de Alcala, 5 miles away. Now part of Mission Trails Regional Park.