Cal. Water Code § 420

The weather resources management project operator shall keep a record of all operations conducted, showing the equipment, the methods, the types, amounts, times, and places of seeding agents employed, a statement as to the estimated effect of the operation in relation to its intended purpose, and the name and address of each person participating or assisting in the operation. A report on the evaluation of project results shall be filed with the department within one year of the termination of a project or, in the case of an ongoing project, at least once every two years.