CONSERVATION SUBDIVISION DESIGN
Table 27-20-1 | ||
|---|---|---|
Maximum Non-Single-Family Units | ||
District | Percentage of Non-Single-Family Units | |
R-1* | 20%* | |
R-2/R-2-A | 30% | |
R-3 | 50% | |
*A minimum site area of 15 acres shall be required in the R-1 District before non-single-family units can be included. |
Table 27-20-2 | ||
|---|---|---|
Density Factors | ||
District | Density Factor | |
R-1 | 1.1 | |
R-2/R-2-A | 1.25 | |
R-3 | 1.5 | |
Table 27-20-3 | ||
|---|---|---|
Setbacks from Off-Site Features | ||
Feature | Setback (feet) | |
External road rights-of-way | 100 | |
All other site area boundaries | 50 | |
Cropland or pasture land | 100 | |
Active recreation areas | 150 | |
Buildings or barnyards housing livestock | 300 | |
Table 27-20-4 | ||||
|---|---|---|---|---|
Constrained Land Calculation | ||||
Resource | Number of Acres | Protection Factor | Constrained Land (Acres) | |
1. | Land within the rights-of-way for existing utility lines | x 1.0 | = | |
2. | Existing protected open space (such as easements) | x 1.0 | = | |
3. | Wetlands, lakes, ponds and other water bodies | x 1.0 | = | |
4. | Floodway of streams and other watercourses | x 1.0 | = | |
5. | 100-year floodplains | x 0.5 | = | |
6. | Steep slopes 15% - 24.99%* | x 0.5** | = | |
7. | Steep slopes 25% - 40%* | x 0.75** | = | |
8. | Steep slopes > 40%* | x 0.95** | = | |
Constrained land = Sum of 1 through 8 | ||||
NOTES: | |
|---|---|
* | Excluding areas of contiguous slopes less than 100 square feet. |
** | These percentages consistent with the steep slope controls of § 27-2111. |
*** | If a portion of the site area contains more than one feature subject to a density factor, that acreage shall be subject to the most-restrictive density factor. |
Table 27-20-5 | |||
|---|---|---|---|
Adjusted Tract Area Calculation | |||
Gross Tract Area | Constrained Land | Adjusted Tract Area (ATA) | |
— | = | ||
Table 27-20-6 | |||
|---|---|---|---|
Greenway Land Calculation for Very Constrained Site Areas | |||
Constrained Land (> 65% of Gross Tract Area) | 5% x ATA | Minimum Greenway Land | |
+ | = | ||
Table 27-20-7 | |||
|---|---|---|---|
Greenway Land Calculation for Less-Constrained Site Areas | |||
Constrained Land (< 65% of Gross Tract Area) | 40% x ATA | Minimum Greenway Land (but not > 70% Gross Tract Area)* | |
+ | = | ||
NOTES: | ||
|---|---|---|
* | But greenway land shall not exceed a maximum of 70% of the gross tract area. | |
Table 27-20-8 | ||
|---|---|---|
Calculate Maximum Number of Dwelling Units | ||
1. | Take gross tract area | |
2. | Subtract constrained land; if in acres, convert to square feet | |
3. | Multiply result by 0.90 to account for land that must be set aside for roads and other infrastructure | |
4. | Divide by minimum lot size for conventional single-family dwellings (R-1 = 20,000; R-2/R-2-A = 16,000, R-3 = 12,000) | |
5. | Multiply result by the corresponding density factor (R-1 = 1.1; R-2/R-2-A = 1.25; R-3 = 1.5) | |
6. | Round result to next-lowest number | |
7. | Maximum number of dwelling units = | |
Table 27-20-9 [Amended by Ord. No. 716, 11/23/2020] | ||
|---|---|---|
Determine if Maximum | ||
1. | Take gross tract area | |
2. | Subtract minimum greenway land (calculated under Subsection 2008.2A above) | |
3. | Equals buildable area | |
4. | Divide by maximum = dwelling units (calculated under Subsection 2008.2B above) | |
5. | Compare result to minimum lot size for CSD single-family (R-1 = 12,000; R-2/R-2-A = 10,000; R-3 = 8,500) | |
6. | If buildable area cannot accommodate all single-family, determine if incorporating allowable % of multifamily would work: | |
District | Max % Multifamily | Minimum Lot Size (square feet) | |
|---|---|---|---|
R-1 | 20% | 2-family — 8,000/du | |
R-2 / R-2-A | 30% | 2-family — 6,000/du | |
R-3 | 50% | 2-family, triplex, fourplex — 5,000/du Townhouse — 5,000/du Garden apartment — 4,000/du |
CONSERVATION SUBDIVISION DESIGN
Table 27-20-1 | ||
|---|---|---|
Maximum Non-Single-Family Units | ||
District | Percentage of Non-Single-Family Units | |
R-1* | 20%* | |
R-2/R-2-A | 30% | |
R-3 | 50% | |
*A minimum site area of 15 acres shall be required in the R-1 District before non-single-family units can be included. |
Table 27-20-2 | ||
|---|---|---|
Density Factors | ||
District | Density Factor | |
R-1 | 1.1 | |
R-2/R-2-A | 1.25 | |
R-3 | 1.5 | |
Table 27-20-3 | ||
|---|---|---|
Setbacks from Off-Site Features | ||
Feature | Setback (feet) | |
External road rights-of-way | 100 | |
All other site area boundaries | 50 | |
Cropland or pasture land | 100 | |
Active recreation areas | 150 | |
Buildings or barnyards housing livestock | 300 | |
Table 27-20-4 | ||||
|---|---|---|---|---|
Constrained Land Calculation | ||||
Resource | Number of Acres | Protection Factor | Constrained Land (Acres) | |
1. | Land within the rights-of-way for existing utility lines | x 1.0 | = | |
2. | Existing protected open space (such as easements) | x 1.0 | = | |
3. | Wetlands, lakes, ponds and other water bodies | x 1.0 | = | |
4. | Floodway of streams and other watercourses | x 1.0 | = | |
5. | 100-year floodplains | x 0.5 | = | |
6. | Steep slopes 15% - 24.99%* | x 0.5** | = | |
7. | Steep slopes 25% - 40%* | x 0.75** | = | |
8. | Steep slopes > 40%* | x 0.95** | = | |
Constrained land = Sum of 1 through 8 | ||||
NOTES: | |
|---|---|
* | Excluding areas of contiguous slopes less than 100 square feet. |
** | These percentages consistent with the steep slope controls of § 27-2111. |
*** | If a portion of the site area contains more than one feature subject to a density factor, that acreage shall be subject to the most-restrictive density factor. |
Table 27-20-5 | |||
|---|---|---|---|
Adjusted Tract Area Calculation | |||
Gross Tract Area | Constrained Land | Adjusted Tract Area (ATA) | |
— | = | ||
Table 27-20-6 | |||
|---|---|---|---|
Greenway Land Calculation for Very Constrained Site Areas | |||
Constrained Land (> 65% of Gross Tract Area) | 5% x ATA | Minimum Greenway Land | |
+ | = | ||
Table 27-20-7 | |||
|---|---|---|---|
Greenway Land Calculation for Less-Constrained Site Areas | |||
Constrained Land (< 65% of Gross Tract Area) | 40% x ATA | Minimum Greenway Land (but not > 70% Gross Tract Area)* | |
+ | = | ||
NOTES: | ||
|---|---|---|
* | But greenway land shall not exceed a maximum of 70% of the gross tract area. | |
Table 27-20-8 | ||
|---|---|---|
Calculate Maximum Number of Dwelling Units | ||
1. | Take gross tract area | |
2. | Subtract constrained land; if in acres, convert to square feet | |
3. | Multiply result by 0.90 to account for land that must be set aside for roads and other infrastructure | |
4. | Divide by minimum lot size for conventional single-family dwellings (R-1 = 20,000; R-2/R-2-A = 16,000, R-3 = 12,000) | |
5. | Multiply result by the corresponding density factor (R-1 = 1.1; R-2/R-2-A = 1.25; R-3 = 1.5) | |
6. | Round result to next-lowest number | |
7. | Maximum number of dwelling units = | |
Table 27-20-9 [Amended by Ord. No. 716, 11/23/2020] | ||
|---|---|---|
Determine if Maximum | ||
1. | Take gross tract area | |
2. | Subtract minimum greenway land (calculated under Subsection 2008.2A above) | |
3. | Equals buildable area | |
4. | Divide by maximum = dwelling units (calculated under Subsection 2008.2B above) | |
5. | Compare result to minimum lot size for CSD single-family (R-1 = 12,000; R-2/R-2-A = 10,000; R-3 = 8,500) | |
6. | If buildable area cannot accommodate all single-family, determine if incorporating allowable % of multifamily would work: | |
District | Max % Multifamily | Minimum Lot Size (square feet) | |
|---|---|---|---|
R-1 | 20% | 2-family — 8,000/du | |
R-2 / R-2-A | 30% | 2-family — 6,000/du | |
R-3 | 50% | 2-family, triplex, fourplex — 5,000/du Townhouse — 5,000/du Garden apartment — 4,000/du |