Скачать презентацию ALERT Low Water Crossing Warning Systems Produced by Скачать презентацию ALERT Low Water Crossing Warning Systems Produced by

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ALERT Low Water Crossing Warning Systems Produced by Rand Allan, Associate Meteorologist County of ALERT Low Water Crossing Warning Systems Produced by Rand Allan, Associate Meteorologist County of San Diego Flood Control

The Need for Low Water Crossing Warning Systems u Flooding claims scores of lives The Need for Low Water Crossing Warning Systems u Flooding claims scores of lives each year u Each foot of water rise displaces up to 1500 lbs of vehicle weight u Lateral force of a flooding stream can place over 500 lbs of force on a vehicle u Small vehicles and pedestrians can be swept off the road in as little as 6”-12” of water u Flood waters can hide washed-out

Low Water Crossing Warning Devices Three Examples Low Water Crossing Warning Devices Three Examples

Stand-Alone System u Warning Flasher Scottsdale, AZ light • Relatively activates when inexpensive, cost Stand-Alone System u Warning Flasher Scottsdale, AZ light • Relatively activates when inexpensive, cost water over -$2, 000 about $1, 000 the road u Good for remote, • Can be traveled lightly built in-house areas with little • For about $2, 500 accident can be more they history modified for ALERT u However, there is radio transmission no notification given to authorities

Automated ALERT Signals u • Station can phone agencies Under control of ALERT Flasher Automated ALERT Signals u • Station can phone agencies Under control of ALERT Flasher Harmony Grove, CA to warn of flood events system u As water first flows over road, lights flash • Agencies can phone station yellow; sign conditions to get currentsays use caution when crossing • Cost is moderate, about u As water reaches 6” $15, 000 to $20, 000 flash over road, lights red, sign moderate • Good forchanges to traffic road closed condition areas with low accident rate u Sensor can be installed to detect washed-out

ALERT Signal/Barrier System u. Station will call agencies u Under flooding to warn of ALERT Signal/Barrier System u. Station will call agencies u Under flooding to warn of control of ALERT System u. Agencies can call station u Barriers prevent to get current status of crossing the stream crossing when water depth u. Closed circuit loop in reaches 6” over road can detect road u Sensors in road prevent washout and close barriers motorists from becoming is useful u. Installation trapped between traffic causes a where heavybarriers u ALERT incidents high rate of transmits water levels and times of road u. Installation is expensive - ALERT Flasher/Barrier Spring Valley, CA

Benefits of Warning Systems u Real-time water levels for crossing safety u Immediate notification Benefits of Warning Systems u Real-time water levels for crossing safety u Immediate notification of start and end of road flooding and closure u Reduced overtime costs waiting for roads to flood u Road u Legal u No crews can attend to other priorities protection for gov’t agencies excuses for not knowing it was

Considerations u Requires dedicated maintenance u Initial cost can be quite expensive u Design Considerations u Requires dedicated maintenance u Initial cost can be quite expensive u Design of system has to match the needs of the low water crossing u Procedures need to be established between agencies u Legal regulations may need to be established

Low Water Crossing Systems For further information, please contact: Rand Allan (858) 495 -5557 Low Water Crossing Systems For further information, please contact: Rand Allan (858) 495 -5557 e-mail: [email protected] san-diego. ca. us