Section 20.03.15.040 - SIZE OF A LEASABLE TRACT01.Surface Area. Geothermal leases are not limited in surface area. The Board will determine the surface area of a lease after consultation with other state agencies and prospective Lessees. The probable extent of a geothermal reservoir, the surface area needed for a viable project, and other relevant factors will be used to help determine lease surface area.02.Navigable Water Courses. Geothermal resources leases may be issued for state lands underlying navigable water courses in Idaho. Such lands are considered "state lands" and will be leased in accordance with these rules. Operations in the beds of navigable water courses will not be authorized except in necessary circumstances and then only with express written approval of the Board upon such conditions and security as the Department deems appropriate.Idaho Admin. Code r. 20.03.15.040