TID sets reduced irrigation cap amid historically dry year The 2021 TID irrigation season will last 223 days and run from March 18 through Oct. 27 (Journal file photo). Local growers serviced by the Turlock Irrigation District will see a 34-inch water cap allotment this irrigation season, set to begin March 18. The water cap is a decrease from last year’s 42-inch allotment and comes as the Tuolumne River Watershed experiences what has been a historically-dry water year — and a second consecutive year of below-average rainfall. Under a resolution approved by the TID Board of Directors on Tuesday, the 2021 irrigation season will last 223 days and run through Oct. 27.