The upper figure is an oblique aerial view of mountainous terrain near a lake. The blue box next to the lake represents a portable electric generator which powers pumps that send water into the mountains. The pair of arrows point to two different hose lays. A valve can be remotely controlled by the data network to direct water into one or the other branches of the hose lays.

Assume that the arrows point to two different lays of spray hose that have been deployed to fight a fire approaching from the right. At first, the hose lay on the right can used to spray water or foam to fight the fire. If the fire gets past the lay on the right, then the valve can switch the water to the hose lay on the left.

The lower figure shows how a loop of spray hose can be used to prevent a prescribed fire from getting out of control. Each half of the loop can be 8 miles long and can deliver 400 gpm of water.

A section on near side of the loop is shown as spraying water or foam along its length. Selected spray hose segments can, by remote control, simultaneously spray water locally while passing water to the next segment of hose. This water curtain can stop the escape of a prescribed fire.

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