OAKLEY -- Local youngsters and their families are invited to test the Delta's water this month as part of the World Water Monitoring Challenge.

Delta Science Center is organizing the event, which will be 10 a.m. to noon March 22 at Big Break Regional Shoreline Park, 69 Big Break Road, Oakley.

On the way students throughout the world will be testing their local rivers and comparing notes on the Internet.

The local event targets fifth-graders, who will fill test tubes with a few drops from the San Joaquin River and dissolve tablets in it to determine the water's pH. Children also will measure the water's turbidity, temperature, and the level of dissolved oxygen, which fish need to survive.

Results will be uploaded to the Web, where participants can compare them with those from Africa's Nile River and other bodies of water.

For more information, go to www.DeltaScienceCenter.org.

Reach Rowena Coetsee at 925-779-7141.