Jump to: Flood Factor | Example Calculations | 1913 Flood Maps
Properties that benefit from the protection of the Miami Conservancy District integrated flood protection system pay an annual assessment. The methodology was developed in 1917 and has been used for over 100 years.
The amount of your assessment is based on your property’s benefit received multiplied by the assessment rate:
Benefit
The benefit represents the enhanced value of the property resulting from flood protection and is computed using the following flood factors:
Land and building tax values
Flood Factor
Rate
The rate is assigned annually by the Miami Conservancy District Board of Directors and is subject to approval by the Conservancy Court:
Maintenance Rate
Capital Improvement Rate
Flood Factor
The flood factor is applied to your property value (which is provided by your County Auditor). It is based on the 1913 flood depth on your property and the type of protection you receive:
Full protection “flood factors” range from 6% to 30% and is based on the depth of flooding in 1913. This land is usually in cities that are protected by both the dams and levees to the full design of the system.
Partial protection has a “flood factor” of 3% - this is property not protected by levees. Typically, this is land outside cities that is not protected by levees but have reduced risk of flooding because of the dams.
Full & Partial Protection Maps By County:
|
Properties protected by the dams, storage basins, and levees |
|
|
Flood Depth in 1913 (ft.) |
Flood Factor |
|
10 feet or more |
30 |
|
7 – 9.99 |
28.5 |
|
6 - 6.99 |
27 |
|
5 – 5.99 |
24 |
|
4 – 4.99 |
19.5 |
|
3 – 3.99 |
15 |
|
2 – 2.99 |
9 |
|
0.5 – 1.99 |
7.5 |
|
Greater than 0 – 0.49 |
6 |
Properties protected by dams and storage basins only |
|
Flood Depth in 1913 (ft.) |
Flood Factor |
Greater than 0 |
3 |
1913 Flood Area & Depth Maps
Information from topographic mapping (property elevations) and high water elevations surveyed and recorded immediately after the Great Flood of 1913 is used to determine flood depth.
Example 1
$100K property fully protected
Property 1 was flooded in 1913 and now receives risk reduction by the dams, storage basins, levees, and channels. One hundred percent of the land was flooded. The following information about the property is used in the Benefit computation:
Benefit
Property Tax Value x Flood Factor
($35,000 x 15% = $5,250)
Annual Maintenance Assessment
Benefit x Rate ($5,250 x 3.35% = $175.88)
Annual Capital Assessment
Benefit x Rate ($5,250 x 1% = $52.50)
Example 2
$100K property partially protected, building within flooded area
Property 2 was flooded in 1913 and now receives risk reduction due to the action of the dams and storage basins. Only 40 percent of the land was flooded, and the current building location is within the flooded area. The following information about the property is used in the Benefit computation:
Benefit
Property Tax Value x Modifier x Flood Factor
[($8,750 x 40%) + ($26,250)] x 3% = $892.50
Annual Maintenance Assessment
Benefit x Rate ($892.50 x 3.35% = $29.90)
Annual Capital Assessment
Benefit x Rate ($892.50 x 1% = $8.92)
Because only 40% of the land area was flooded, a 40% modifier was applied to the Land Tax Value.
Example 3
$100K property partially protected, building outside flooded area
The same property as demonstrated in Example 2 except the building is not located within the flooded area. The following information about the property is used in the Benefit computation:
Benefit
Land Tax Value x Modifier x Flood Factor
($8,750 x 40% x 3%) = $105
Annual Maintenance Assessment
Benefit x Rate ($105 x 3.35% = $3.52)
Annual Capital Assessment
Benefit x Rate ($105 x 1% = $1.05)
Because only 40% of the land area was flooded, a 40% modifier was applied to the Land Tax Value. The Building Tax Value was not included in the computation because the building is not located within the flooded area.
