Tables: Appendix C: Sample Municipal Stormwater Management Plan¶
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1. Table 1¶
Appendix C: Sample Municipal Stormwater Management Plan, PDF p. 22
| Category | Tree Removed (DBH) | Tree Replacement Criteria (See Appendix A) | Application Fee (Municipality may choose to include and determine appropriate fees.) |
|---|---|---|---|
| 1 | DBH of 2.5" (for street trees) or 6" (for non-street trees) to 12.99" | Replant 1 tree with a minimum tree caliper of 1.5" for each tree removed | TBD by town |
| 2 | DBH of 13" to 22.99" | Replant 2 trees with minimum tree calipers of 1.5" for each tree removed | TBD by town |
| 3 | DBH of 23" to 32.99" | Replant 3 trees with minimum tree calipers of 1.5" for each tree removed | TBD by town |
| 4 | DBH of 33" or greater | Replant 4 trees with minimum tree calipers of 1.5" for each tree removed | TBD by town |
Source context and notes
Tree Replacement Requirements Table: | Category | Tree Removed (DBH) | Tree Replacement Criteria (See Appendix A) | Application Fee (Municipality may choose to include and determine appropriate fees.) | | --- | --- | --- | --- | | 1 | DBH of 2.5" (for street trees) or 6" (for non-street trees) to 12.99" | Replant 1 tree with a minimum tree caliper of 1.5" for each tree removed | TBD by town | | 2 | DBH of 13" to 22.99" | Replant 2 trees with minimum tree calipers of 1.5" for each tree removed | TBD by town | | 3 | DBH of 23" to 32.99" | Replant 3 trees with minimum tree calipers of 1.5" for each tree removed | TBD by town | | 4 | DBH of 33" or greater | Replant 4 trees with minimum tree calipers of 1.5" for each tree removed | TBD by town | ## Municipal Stream Corridor Protection Plan Stream corridors, i.e., a vegetated zone or "buffer" along a stream, help filter pollutants carried in runoff, reduce erosion and maintain stream integrity, shade the stream, reduce temperature fluctuations caused by runoff and provide wildlife habitat. They are therefore of great value and can be a determinant of stream quality. Natural stream corridors protect homes and property from flood damage by providing a range of economic, ecological, and social benefits. Maintaining a stream corridor is instrumental in maintaining a healthy riparian ecosystem. Protecting a stream corridor saves resources, money and time, and such efforts are generally better at maintaining ecologic diversity than a restored stream corridor. However, even restoration of impaired waters provides the benefits mentioned above. An MSWMP may require a stream corridor protection plan, which would include information on methods of evaluation, restoration and how to improve streams and stream corridors. Such a plan would define where a buffer would exist, e.g., for streams where a discernible bank exists, the buffer would extend a set distance – often 200 - 300 feet – from the edge of the bank and for streams where there is no discernible bank, the buffer would extend from the centerline of said stream. The resulting plan serves to protect the stream from inappropriate development and maintain its value as a natural resource.2. Table 2¶
Appendix C: Sample Municipal Stormwater Management Plan, PDF p. 27
| GIS Layer | Inland | Coastal |
|---|---|---|
| Federal Emergency Management Agency (FEMA) National Flood Hazard Layer | ✓ | ✓ |
| NJ Inland Design Flood Elevation | ✓ | |
| Tidal Climate Adjusted Flood Elevation (CAFE) | ✓ | |
| LULC Urban 2015 with Future Flooding | ✓ | |
| Height Above Nearest Drainage (HAND) Average Flood Event | ✓ | ✓ |
| Sea Level Rise of 2, 3 and 5 Feet | ✓ | |
| Sea, Lake and Overland Surges (SLOSH) Hurricane Storm Surge | ✓ |
Source context and notes
https://tiles.arcgis.com/tiles/ze0XBzU1FXj94DJq/arcgis/rest/services/HAND_Average_Flood_Event/MapServer. ☐ The Sea Level Rise of 2, 3 and 5 Feet layer shows potential flooding inundation of 2, 3 and 5 feet above Mean Higher High Water (MHHW) for tidally influenced areas. This layer can be added directly through NJ GeoWeb under the "Water" tab. ☐ The Sea, Lake and Overland Surges (SLOSH) Hurricane Storm Surge layer estimates storm surge heights resulting from historical, hypothetical or predicted hurricanes and is found at this URL: https://services1.arcgis.com/ze0XBzU1FXj94DJq/arcgis/rest/services/SLOSH_Hurricane_Storm_Surge/FeatureServer. This layer compliments the above-listed layers. It is important to understand whether a municipality is inland or coastal in terms of impacts because a municipality does not need to be located directly along the Atlantic Ocean to experience coastal impacts. Many municipalities along the Passaic River, Raritan River and Mullica River, for example, experience storm surge because they are tidally influenced, and coastal/tidally areas have more climate change impacts of which to be more aware. With this in mind, the following table summarizes which layers may best be suited to inland versus coastal communities. | GIS Layer | Inland | Coastal | | --- | --- | --- | | Federal Emergency Management Agency (FEMA) National Flood Hazard Layer | ✓ | ✓ | | NJ Inland Design Flood Elevation | ✓ | | | Tidal Climate Adjusted Flood Elevation (CAFE) | | ✓ | | LULC Urban 2015 with Future Flooding | ✓ | | | Height Above Nearest Drainage (HAND) Average Flood Event | ✓ | ✓ | | Sea Level Rise of 2, 3 and 5 Feet | | ✓ | | Sea, Lake and Overland Surges (SLOSH) Hurricane Storm Surge | | ✓ | It is important to note that all available internal and local resources shall also be used to accurately evaluate climate change impacts to the fullest extent possible. In order to become the basis for the second requirement of N.J.A.C. 7:8-4.2(c)15, the end product for this requirement is a comprehensive set of GIS layers reflecting climate change impacts created by sea level rise, increased flooding frequency and extent, increased rainfall depth and increased intensity. ## Step 2: Identify Areas and Infrastructure Vulnerable to Flooding and/or Sea Level Rise The next step to developing a climate resilience strategy is an identification of areas and infrastructure sensitive to the climate change impacts identified in Step 1. By infrastructure, the focus is specifically on stormwater management facilities such as, but not limited to, inlets, catch basins, stormwater conveyances, cisterns, dry wells, grass swales, green roofs, manufactured treatment devices (MTDs), pervious paving systems, bioretention basins, infiltration basins, sand filters, filter strips, constructed wetlands, wet ponds, blue roofs and detention basins.3. Table 3¶
Appendix C: Sample Municipal Stormwater Management Plan, PDF p. 32
| Asset Name | Asset Category | Climate Impact | Description of Impacts | |||||
|---|---|---|---|---|---|---|---|---|
| Increased Temp. | Sea level rise | Precipitation | Ocean Acidification | Drought/Water Supply | ||||
| Outfall 101 | Stormwater Management Infrastructure | 1 | 1 | 5 | 1 | 1 | 1 | Outfall will be inundated during the 100-year storm |
| Outfall 102 | Stormwater Management Infrastructure | 1 | 1 | 5 | 1 | 1 | 1 | Outfall will be inundated during the 100-year storm |
Source context and notes
[Figure in source PDF](SOURCE.pdf#page=32) Figure 4: Climate Change Impacts Overlapped with Stormwater Management Facilities Figure 5: Vulnerability Assessment Matrix | Asset Name | Asset Category | Climate Impact | | | | | | Description of Impacts | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | Increased Temp. | Sea level rise | Precipitation | Ocean Acidification | Drought/Water Supply | | | | Outfall 101 | Stormwater Management Infrastructure | 1 | 1 | 5 | 1 | 1 | 1 | Outfall will be inundated during the 100-year storm | | Outfall 102 | Stormwater Management Infrastructure | 1 | 1 | 5 | 1 | 1 | 1 | Outfall will be inundated during the 100-year storm | Based on the results of the vulnerability matrix, it was determined that multiple stormwater outfalls not previously inundated by the 100-year storm will now be inundated. To avoid potential damage, contamination and flooding, {insert name of municipality} proposes to install and maintain a combination of stormwater pumps and backflow preventers at the most critical locations. These critical locations were determined based on where frequently flooded areas intersect critical infrastructure, such as main ingress and egress routes, emergency response services, food and water supply, medical care, communications and energy infrastructure, and hazardous materials facilities. This was done with the goal of being able to maintain continuous operation of critical business and government functions during an emergency. The above example provides sample language for a small portion of the municipality, but this analysis needs to be completed for the entire municipality and all of its stormwater management infrastructure to ensure resilience in the face of climate change. ## Plan Consistency4. Table C - 1: Sample Build-Out Calculations for Two HUC14s¶
Appendix C: Sample Municipal Stormwater Management Plan, PDF p. 38
| HUC14 and Zone | Total Area (acres) | Existing Impervious (%) | Existing Impervious (acres) | Wetlands/ Water Area (acres) | Developable Area (acres) | Allowable Impervious (%) | Build-Out Impervious (acres) |
|---|---|---|---|---|---|---|---|
| 02030105110060 | |||||||
| Mountain (MZ) | 2,009.84 | 1.08% | 21.68 | 485.84 | 1,524.00 | 5% | 76.20 |
| Quarry (Q) | 765.52 | 0.02% | 0.18 | 32.46 | 733.06 | 5% | 36.65 |
| TOTALS | 2,775.36 | 0.8% | 21.86 | 518.30 | 2,257.06 | 5% | 112.85 |
| 020301050040010 | |||||||
| Agriculture (AG) | 2,206.32 | 2.94% | 64.92 | 327.38 | 1,878.94 | 5% | 93.95 |
| Neighborhood Shopping Center District (C1) | 402.70 | 1.85% | 7.47 | 7.05 | 395.65 | 65% | 257.17 |
| Mountain (MZ) | 663.23 | 2.88% | 19.12 | 134.88 | 528.35 | 5% | 26.42 |
| TOTALS | 3,272.25 | 2.8% | 91.51 | 469.31 | 2,802.94 | 13% | 377.54 |
Source context and notes
Table C - 1: Sample Build-Out Calculations for Two HUC14s | HUC14 and Zone | Total Area (acres) | Existing Impervious (%) | Existing Impervious (acres) | Wetlands/ Water Area (acres) | Developable Area (acres) | Allowable Impervious (%) | Build-Out Impervious (acres) | | --- | --- | --- | --- | --- | --- | --- | --- | | 02030105110060 | | | | | | | | | Mountain (MZ) | 2,009.84 | 1.08% | 21.68 | 485.84 | 1,524.00 | 5% | 76.20 | | Quarry (Q) | 765.52 | 0.02% | 0.18 | 32.46 | 733.06 | 5% | 36.65 | | TOTALS | 2,775.36 | 0.8% | 21.86 | 518.30 | 2,257.06 | 5% | 112.85 | | 020301050040010 | | | | | | | | | Agriculture (AG) | 2,206.32 | 2.94% | 64.92 | 327.38 | 1,878.94 | 5% | 93.95 | | Neighborhood Shopping Center District (C1) | 402.70 | 1.85% | 7.47 | 7.05 | 395.65 | 65% | 257.17 | | Mountain (MZ) | 663.23 | 2.88% | 19.12 | 134.88 | 528.35 | 5% | 26.42 | | TOTALS | 3,272.25 | 2.8% | 91.51 | 469.31 | 2,802.94 | 13% | 377.54 | Note: The Mountain, Quarry and Agricultural Zoning District allow for rural residential development on five acre lots with a maximum percent impervious of 5 percent. Table C - 2: Pollutant Loads by Land Cover | Land Cover | Total Phosphorus Load (lbs/acre/year) | Total Nitrogen Load (lbs/acre/year) | Total Suspended Solids Load (lbs/acre/yr) | | --- | --- | --- | --- | | High, Medium Density Residential | 1.4 | 15 | 140 | | Low Density, Rural Residential | 0.6 | 5 | 100 | | Commercial | 2.1 | 22 | 200 | | Industrial | 1.5 | 16 | 200 | | Urban, Mixed Urban, Other Urban | 1.0 | 10 | 120 | | Agricultural | 1.3 | 10 | 300 | | Forest, Water, Wetlands | 0.1 | 3 | 40 | | Barren Land/Transitional Area | 0.5 | 5 | 60 |5. Table C - 2: Pollutant Loads by Land Cover¶
Appendix C: Sample Municipal Stormwater Management Plan, PDF p. 38
| Land Cover | Total Phosphorus Load (lbs/acre/year) | Total Nitrogen Load (lbs/acre/year) | Total Suspended Solids Load (lbs/acre/yr) |
|---|---|---|---|
| High, Medium Density Residential | 1.4 | 15 | 140 |
| Low Density, Rural Residential | 0.6 | 5 | 100 |
| Commercial | 2.1 | 22 | 200 |
| Industrial | 1.5 | 16 | 200 |
| Urban, Mixed Urban, Other Urban | 1.0 | 10 | 120 |
| Agricultural | 1.3 | 10 | 300 |
| Forest, Water, Wetlands | 0.1 | 3 | 40 |
| Barren Land/Transitional Area | 0.5 | 5 | 60 |
Source context and notes
| Neighborhood Shopping Center District (C1) | 402.70 | 1.85% | 7.47 | 7.05 | 395.65 | 65% | 257.17 | | Mountain (MZ) | 663.23 | 2.88% | 19.12 | 134.88 | 528.35 | 5% | 26.42 | | TOTALS | 3,272.25 | 2.8% | 91.51 | 469.31 | 2,802.94 | 13% | 377.54 | Note: The Mountain, Quarry and Agricultural Zoning District allow for rural residential development on five acre lots with a maximum percent impervious of 5 percent. Table C - 2: Pollutant Loads by Land Cover | Land Cover | Total Phosphorus Load (lbs/acre/year) | Total Nitrogen Load (lbs/acre/year) | Total Suspended Solids Load (lbs/acre/yr) | | --- | --- | --- | --- | | High, Medium Density Residential | 1.4 | 15 | 140 | | Low Density, Rural Residential | 0.6 | 5 | 100 | | Commercial | 2.1 | 22 | 200 | | Industrial | 1.5 | 16 | 200 | | Urban, Mixed Urban, Other Urban | 1.0 | 10 | 120 | | Agricultural | 1.3 | 10 | 300 | | Forest, Water, Wetlands | 0.1 | 3 | 40 | | Barren Land/Transitional Area | 0.5 | 5 | 60 | Source: NJDEP Stormwater BMP Manual 2004.6. Table C - 3: Nonpoint Source Loads at Build-Out for Two Example HUC14s¶
Appendix C: Sample Municipal Stormwater Management Plan, PDF p. 39
| HUC14 and Zone | Build-Out Zoning | Develop-able Area (acres) | TP (lbs/acre/ | TP (lbs/yr) | TN (lbs/acre/ | TN (lbs/yr) | TSS (lbs/acre/ | TSS (lbs/yr) |
|---|---|---|---|---|---|---|---|---|
| 02030105110060 | ||||||||
| Mountain (MZ) | Rural Residential | 1,524 | 0.60 | 963 | 5 | 7,685 | 100 | 153,267 |
| Quarry (Q) | Rural Residential | 733 | 0.60 | 443 | 5 | 3,666 | 100 | 73,313 |
| TOTALS | 2,257 | 1,406 | 11,351 | 226,580 | ||||
| 020301050040010 | ||||||||
| Agriculture (AG) | Rural Residential | 1,879 | 0.60 | 1,160 | 5 | 9,589 | 100 | 190,491 |
| Neighborhood Shopping Center District (C1) | Commercial | 396 | 2.10 | 832 | 22 | 8,727 | 200 | 79,429 |
| Mountain (MZ) | Rural Residential | 528 | 0.60 | 331 | 5 | 2,699 | 100 | 53,600 |
| TOTALS | 2,803 | 2,323 | 21,015 | 323,520 |
Source context and notes
Table C - 3: Nonpoint Source Loads at Build-Out for Two Example HUC14s | HUC14 and Zone | Build-Out Zoning | Develop-able Area (acres) | TP (lbs/acre/ | TP (lbs/yr) | TN (lbs/acre/ | TN (lbs/yr) | TSS (lbs/acre/ | TSS (lbs/yr) | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 02030105110060 | | | | | | | | | | Mountain (MZ) | Rural Residential | 1,524 | 0.60 | 963 | 5 | 7,685 | 100 | 153,267 | | Quarry (Q) | Rural Residential | 733 | 0.60 | 443 | 5 | 3,666 | 100 | 73,313 | | TOTALS | | 2,257 | | 1,406 | | 11,351 | | 226,580 | | 020301050040010 | | | | | | | | | | Agriculture (AG) | Rural Residential | 1,879 | 0.60 | 1,160 | 5 | 9,589 | 100 | 190,491 | | Neighborhood Shopping Center District (C1) | Commercial | 396 | 2.10 | 832 | 22 | 8,727 | 200 | 79,429 | | Mountain (MZ) | Rural Residential | 528 | 0.60 | 331 | 5 | 2,699 | 100 | 53,600 | | TOTALS | | 2,803 | | 2,323 | | 21,015 | | 323,520 | It is important to note that, although the pollutant loads for agricultural lands are higher than those for low density residential for the parameters in Table B - 2, converting agricultural lands to residential typically results in an increase in pollutant loads for metals and petroleum hydrocarbons. It is recommended that each municipality calculate build-out pollutant loads for each type of land use. Also, total suspended solids loads due to stormwater runoff may decrease due to the conversion of agricultural lands to low density residential; however, in this case, the percentage of impervious surfaces increases dramatically. If, due to the increase of impervious surfaces, increases in stormwater runoff flows are not managed properly, these high flows will increase streambank erosion, thereby increasing sediment loads to the receiving waters. There are a number of resources available for assistance with preparing the build-out analysis, including the Association of New Jersey Environmental Commissions (ANJEC), various watershed associations within the State, Rutgers University's Center for Remote Sensing and Spatial Analysis and the Nonpoint Education of Municipal Officials (NEMO). The mapping and querying ability of GIS software such as ESRI's ArcView is essential for preparing a build-out analysis in a cost-effective manner. ## Mitigation PlansImages on table pages¶
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