Los Angeles County Public Works Department has a video available  called "No Way Out" which is meant to educate the public about the dangers of moving water.

It is available for $20 including shipping and handling by contacting:

Dr. Betty Hennessy                                                                                                                                                      Division of Curriculum, Instruction, and Assessment                                                                                                  Los Angeles County Office of Education                                                                                                                  9300 Imperial Highway, Room 299                                                                                                                            Downey, CA 90242-2890

Below is a safety handout used by Los Angeles County for this purpose.

Some of this information is specific to their area, but any community seeking to provide some public education on this subject could modify to their particular needs.