In the preparation of the facts and data to be inserted in said petition and filed therewith for the purpose of presenting the matter to the superior court, the board of commissioners of said drainage district may employ one or more good and competent surveyors and drafters to assist them in compiling data required to be presented to the court with said petition, as hereinbefore provided, and such legal assistance as may be necessary, with full power to bind said district for the compensation of such assistants or employees employed by them, and such services shall be taxed as costs in the suit.