I did some additional research and found the following documents: http://www.ohsep.louisiana.gov/plans/EOPSupplement1a.pdf STATE OF LOUISIANA EOP SUPPLEMENT 1A SOUTHEAST LOUISIANA HURRICANE EVACUATION AND SHELTERING PLAN http://www.epa.gov/earth1r6/6sf/pdffiles/la_emergency_assistance_disaster_act.pdf LOUISIANA EMERGENCY ASSISTANCE AND DISASTER ACT OF 1993 The LOUISIANA EMERGENCY ASSISTANCE AND DISASTER ACT OF 1993 is incorporated by reference into the STATE OF LOUISIANA EOP SUPPLEMENT 1A SOUTHEAST LOUISIANA HURRICANE EVACUATION AND SHELTERING PLAN. In EAP the Parish President ( Mayor of Louisiana) is given the authority to declare a Local State of Emergency. His or her power to order an evacuation is included in that authority. As to the statement "The same power to order an evacuation conferred upon the Governor is also delegated to each political subdivision of the State by Executive Order." In my opinion it pertains to a Statewide Declaration of Emergency. This allows the Parish Presidents ( Mayor of New Orleans) to act on the Governor's behalf and order the evacuation at the Parish level. Otherwise the Governor would have to order an evacuation for each and every Parish. This would be very time consuming and overly burdensome. Since the Parish President ( Mayor of New Orleans) clearly has Authority to evacuate the Parish for Local Emergencies the Statement would not make sense unless you apply it to Statewide emergency declarations. The key word is delegate. Any how that is my humble opinion.
I found what I was looking for in the Louisiana statutes:
http://www.legis.state.la.us/lss/lss.asp?doc=85673
§727. Powers of the parish president; penalties for violations
F. In addition to any other powers conferred upon the parish president by the constitution, laws, or by a home rule charter or plan of government, such authority may do any or all of the following:
(4) Subject to any applicable requirements for compensation, commandeer or utilize any private property if he finds this necessary to cope with the local disaster.
(5) Direct and compel the evacuation of all or part of the population from any stricken or threatened area within the boundaries of the parish if he deems this action necessary for mitigation, response, or recovery measures.
Control over the military force in NO is held by state's Governor or her agent(s), so Nagin can only use NOPD to enforce his mandatory evacuation order. How many officers are in town & how many are off in Las Vegas for R&R? Next, Nagin's power is limited to areas within NO. IOW, he can force people to go to designated places within his jurisdiction, but he can't send them to any place outside of his jurisdiction, which gives the ball to Blanco. State powers would need to be triggered to force people out of Nagin's jurisdiction (parish).