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0 (5) All activities by a water management district, drainage district, or water control district established under the laws of the State of Florida and all activities undertaken by the State of Florida, Indian River County,. or any incorporated municipality within Indian River County, within their respective easements and right-of-way. (6) Any activity or development project which can be demon- strated by the applicant in accordance with Section 15 hereof to have vested rights. Be Emergency Exemption. (1) This ordinance shall not be construed to prevent the doing of any act otherwise lawful and necessary to prevent material harm to or destruction of real or personal property as a result of a present emergency, including but not limited to fire, infestation by pests, or hazards resulting from violent storms or hurricanes or when the property is in eminent peril and the necessity of obtaining a permit is impractical and would cause undue hardship in the protection of the property. (2 ) A report of any such emergency action shall be made to the Division of Public Works by the owner or person in control of the property upon which emergency action was taken as soon as practicable, but not more than -ten (10) days following such action. Remedial action may be required by the Director of Public Works subject to appeal to the County Commission in the event of dispute. SECTION 7. REVIEW CRITERIA FOR ALL DEVELOPMENT PROJECTS A. Stormwater Management Permit (Type A). All development projects are required to obtain.a Type A Permit, No Type A Permit to construct a development project shall be issued unless the following criteria are met: (1) The design of the on-site stormwater management system shall be based at a minimum on a 10 -year frequency 24-hour duration storm event, however, the applicant shall also provide data indicating the effects of a 25 -year frequency 24-hour duration storm event on the development project as proposed. The design of any off-site stormwater management system improvements shall be based upon a 25 -year frequency 24-hour duration storm event. The modified Type 2 SCS Rainfall Distribution shall be used. (2) The hydrologic computations for the stormwater management system shall be based on full hydrograph generation for the development project and contributory area utilizing such methods as published by the Soil Conservation Service (USDA, SCS, "Natural Engineering Handbook", Section 4, Hydrology: 1972 and "Urban Hydrology for Small Watersheds", Technical Release No. 55: