Sirik is the name of a city in Iran and so I believe that the usage of definitive article
the is not needed before Sirik in the following sentences while Grammarly suggests me to add
- This report aims to illustrate the methodology of measuring waves, currents and tides in the desired region for Sirik water reservoir.
- The purpose of these studies is to provide hydrodynamic and wave-based information for the design of Sirik water reservoir.
- The equipment for wave, current and tide measurements in Sirik study area