||Irrigation and drainage canals are some examples of water conveyance systems
spread worldwide. These systems are characterized for the transport phenomena and are
usually operated under closed loop control. Typical considered faults are the unmeasured
water extraction, gate and sensor fault. The classical controller is projected to reject the
unmeasured offtakes and can also accommodate the gate fault. The sensor fault is a critical
fault as it deceives the controller.As the service is based on water levels a falsified information
compromises service quality. Depending on fault intensity, security issues may arise. Here
we propose a sensor fault tolerant architecture to the downstream water level sensor fault.
This architecture is based on two components, first the fault is detected and isolated then the
estimation intensity is used to correct the nominal reference. Based on updating the reference
water depth, additional information is passed to the operating controller for sensor fault
accommodation. The architecture is independent from the controller design and therefore
can be integrated in old irrigation canals.