Iowa Code § 99.3: Notice — temporary writ — without bond.

The defendants shall be served with notice as in other actions and in such action the court, or judge in vacation, shall upon the presentation of a petition therefor alleging that the nuisance complained of exists, allow a temporary writ of injunction without bond, if the existence of such nuisance shall be made to appear to the satisfaction of the court or judge by evidence in the form of affidavits, depositions, oral testimony, or otherwise as the complainant may elect, unless the court or judge by previous order, shall have directed the form and manner in which such evidence shall be presented.