By Jim Mendoza

When heavy rain hits the North Shore, the water that runs under the Joseph P. Leong bridge in Haleiwa is a serious concern for people who farm the land and live in the homes downstream.

Katherine Kawamata's Haleiwa property has been flooded twice. The last time was in December of 2008.

"What are you going to do? The water just keeps rising," she said.

The same storm shoved water and mud into scores of homes that line the waterway that runs from Haleiwa to Waialua after passing under the bridge.

In 1974 a flood killed three people and did a mountain of damage.

Other heavy rains have also lifted the stream over its banks.

Now North Shore residents have a new warning system a computer click away.