It shall be the duty of the county commissioners of the county in which is located the office of any irrigation district, immediately upon receipt of the said certified list of the lands in said district subject to tax hereunder, and upon the receipt of the certificate of said board of directors certifying the total amount of money required to be raised for maintenance, operating and current expenses, as herein provided, to make an ad valorem levy thereupon, such as may be necessary to provide the amount of money required to pay the interest upon and principal of the bonds of said district as the same shall become due; also to fix the specific tax per acre necessary to provide the amount of money required for any other purpose as in this act provided, and which are to be raised by the levy of taxes upon the lands of said district; and to certify said respective levies to the county commissioners of each other county embracing any portion of said district. The rate of levy of ad valorem and specific tax necessary to raise the required amount of money for said district, shall be increased not less than fifteen nor more than twenty-five percent to cover delinquencies and such percentage shall be determined by the board of county commissioners and certified by it to the county assessor of any county embracing the whole or a part of any irrigation district. For the purposes of said district it shall be the duty of the county commissioners of each county in which any irrigation district is located in whole or in part, at the time of making levy for county purposes, to make a levy, as above provided, upon all the lands in said district within their respective counties, subject to taxation under this act, and to deliver a notice to the county assessor thereof.