All necessary expenses incurred in making the investigation, examination, opinions and reports in this chapter provided for shall be paid at such times and in such manner as the director of ecology shall require, by the irrigation district, the affairs of which have been investigated and reported on by the said director: PROVIDED, That the benefit of any service that may have been performed and any data that may have been obtained in pursuance of the requirements of any law other than this chapter, shall be available for the use of the director without charge to said district.