To minimize the public and private losses due to flood conditions, the following purposes shall apply:

   A.   To minimize expenditure of public money and costly flood control projects;

   B.   To minimize the need for rescue and relief efforts associated with flooding and generally undertaken at the expense of the general public;

   C.   To minimize prolonged business interruptions;

   D.   To minimize damage to public facilities and utilities such as water and gas mains, electric, telephone and sewer lines, streets and bridges located in areas of special flood hazard;

   E.   To help maintain a stable tax base by providing for the sound use and development of areas of special flood hazard so as to minimize future flood blight areas;

   F.   To ensure that potential buyers are notified that property is in an area of special flood hazard;

   G.   To ensure that those who occupy the areas of special flood hazard assume responsibility for their actions; and

   H.   To reference city ordinance 146, "floodplain ordinance", as a guide. (Ord. 223, 7-13-2006)

The outer limits of the 100-year frequency flood are shown on a map filed with the city clerk as the designated floodplain. Said map is attached as exhibit A to the ordinance codified herein and by this reference made a part hereof. New or additional engineering data may be considered for reevaluation of floodplain delineation and such data will be submitted to the city building inspector's office for review and conformance with the city policies, that the 100-year flood capacity is maintained, and that minimum floor elevations are above the 100-year water surface elevation for residential structure and above or protected from the 100-year surface elevation from nonresidential structures, and that there is not substantial hazard to either the proposed improvements or to any adjoining property. The city reserves the right to consult with any private agency in reevaluation of floodplain or flood hazard area delineation. (Ord. 223, 7-13-2006)

The federal insurance administration has identified flood hazard areas within the city as shown on FIA flood hazard boundary map 160140-001A, inclusive, which maps are attached as exhibit B to the ordinance codified herein and by this reference made a part of this title. (Ord. 223, 7-13-2006)

In order to promote safety and general welfare, the city shall enforce, through the city building inspector, the following floodplain or flood hazard area regulations:

   A.   Greenbelt Area: A fifty foot (50') width from each bank of all waterways in the city and the impact area for the city shall be set aside as a greenbelt area. The boundaries of the impact area are: on the north, "Work Road" to "Wilder Road" on the south.

   B.   Maintaining Floodway Capacity: No construction shall occur within any 100-year designated floodplain or flood hazard area that will reduce its flood carrying capacity unless mitigating measures, including, but not limited to, channel widening, deepening, or piping are taken to maintain the original floodway capacity without raising the base floodwater surface elevation.

   C.   Building Permit Application: No building permits for construction shall be issued by the city within the 100-year floodplain or flood hazard areas except as provided in this subsection. An applicant for a building permit shall furnish to the city building inspector sufficient engineering data to enable the city building inspector to determine that proper care will be taken to preserve the 100-year flood capacity of the floodplain and flood hazard areas, and that said construction will not create a flood or associated hazard to adjoining property or to the proposed improvements constructed therein.

   D.   Review Of Building Permit Requests: The city building inspector shall review and approve all requests for building permits before issuance to ensure compliance with this title.

   E.   Engineering Data Required; Drainage Criteria: Any applicant for a building permit shall furnish satisfactory engineering data to allow the city building inspector to ascertain that any proposed construction will comply with the following drainage criteria:

      1.   A conceptual drainage plan shall be presented and approved with the preliminary plat. A drainage study shall be submitted and approved before any improvement plans are reviewed.

      2.   The drainage plan shall be submitted by a civil engineer registered in the state of Idaho.

      3.   The drainage study and conceptual plan shall be submitted under the following concepts:

         a.   Drainage Patterns: Drainage flows of all frequencies should enter and depart from the property to be developed in substantially the same manner as predevelopment conditions.

         b.   Street Relationships; Emergency Access: All lots, structures, etc., within a development shall be accessible by at least one route during a 100-year storm with a maximum street water depth of one foot (1'). In all cases, the flow of water shall be contained within rights of way.

         c.   Finished Floor Elevations:

            (1)   The finished floor elevations (including basement) of all residential structures, except as noted in subsection B of this section shall be above the 100-year stormwater surface elevation and the finished floor elevation of all nonresidential structures shall be above or protected from the 100-year stormwater surface elevation. The determination of the 100-year stormwater surface elevation shall be based on a watershed which includes all natural and existing conditions per current zoning ordinance, whichever indicates the higher water surface elevation.

            (2)   Each individual residential structure shall have its finished floor elevation above the 100-year stormwater surface elevation when, according to exhibit B attached to the ordinance codified herein, the structure is located in a zone designated as "A".

            (3)   The city building inspector shall review and approve all requests for building permits for prefabricated and mobile homes to assure:

               (A)   The structure is protected against flood damage.

               (B)   The structure is designed (or modified) and anchored to prevent flotation, collapsing or lateral movement.

               (C)   Construction materials and methods are being used to minimize flood damage. Specific requirements shall be that:

                  (i)   Over the top ties per side at intermediate locations and mobile homes less than fifty feet (50') long requiring an additional tie per side.

                  (ii)   Frame ties be provided at each corner of the home with five (5) additional ties per side at intermediate points and mobile homes less than fifty feet (50') long requiring four (4) additional ties per side.

                  (iii)   All components of the anchoring system be capable of carrying a force of four thousand eight hundred (4,800) pounds, and any additional to the mobile home be similarly anchored.

                  (iv)   Each residential structure shall have its finished floor elevation certified by a civil engineer or land surveyor registered in the state of Idaho that the finished floor has been constructed above the 100-year stormwater surface elevation. This certification shall be approved prior to foundation inspection.

                  (v)   Each nonresidential structure shall have its finished floor elevation certified by a civil engineer or land surveyor registered in the state of Idaho that the finished floor has been constructed above or is protected from the 100-year stormwater surface elevation. This certification shall be approved prior to foundation inspection.

         (D)   Where possible, the retention area shall have four to one (4:1) side slopes and be drained within a ninety six (96) hour period by methods approved by the city building inspector.

         (E)   Parking in floodplains, commercial: Parking within the 100-year floodplain shall be allowed; provided, that there are no unattended vehicles and that there is no substantial obstruction to the free flow of water. If the depth of water exceeds one foot (1') during the base flood, the parking area shall be signed to show the parking area is subject to periodic flooding. (Ord. 223, 7-13-2006)

Building permits shall be required for fences within designated floodplains and flood hazard areas. The city building inspector shall be provided with sufficient engineering data to ascertain that the proposed fence will not substantially alter stormwater flow. (Ord. 223, 7-13-2006)

No person, firm or corporation in the city shall either obstruct or reduce the capacity of a floodplain or flood hazard area by any use or by filling, dumping or constructing, except as proved in this title. (Ord. 254, 1-15-2015)