The board of directors of any water-supply district as provided shall have power to cause to be constructed within such district such works as are authorized by this act and to issue bonds to pay the cost thereof, the outstanding amount at any time of such bonds not exceeding ten percent of the assessed valuation of all taxable lands and improvements within the district as shown by the assessment and tax rolls of the preceding year, and such bonds to be paid by a special assessment levied upon taxable lands and improvements of landowners within the district, and assessed in proportion to the benefit units subscribed to by each landowner as provided in the next preceding section.
K.S.A. 82a-609