Regional arterials: | East State Street (202 Parkway to Swamp Road) Route 611 Bypass Route 202 Parkway South Easton Road (Rt 611) (Bypass to Kelly Road) York Road (Route 263) | |
Community arterials: | Butler Avenue North Easton Road (Doylestown Boro line to Swamp Road) South Easton Road (Doylestown Boro line to the 611 Bypass) Swamp Road (Route 313) (West) State Street (Doylestown Boro line to the 611 Bypass) | |
Community collectors: | Almshouse Road/Tamanend Avenue Broad Street Bristol Road Cherry Lane East Road Edison-Furlong Road Ferry Road Limekiln Road Lower State Road Old Dublin Pike (Doylestown Boro line to Pine Run Road) Pebble Hill Road (Doylestown Boro line to Edison-Furlong Road) Pine Run Road (Old Dublin Pike to Swamp Road) Spring Valley Road Turk Road (Wells Road to Pebble Hill Road) Upper State Road | |
Neighborhood collector: | Burpee Road Iron Hill Road (Shady Retreat Road to Sandy Ridge Road) Kelly Road Meetinghouse Road New Britain Road Old New Road Pebble Hill Road (Sauerman Road to Edison-Furlong Road) Pebble Hill Road (Edison-Furlong Road to Sugar Bottom Road) Pine Run Road (Limekiln Road to Old Dublin Pike) Rodgers Road Sandy Ridge Road Sauerman Road Shady Retreat Road Short Road Sugar Bottom Road Turk Road (Bristol Road to Almshouse Road) Wells Road Wilkshire Road | |
Residential access (local) streets | All other streets |
Posted Speed on Higher Order Street (miles per hour) | Minimum Sight Distance (feet) |
---|---|
25 | 150 |
30 | 200 |
35 | 250 |
40 | 325 |
45 | 400 |
50 | 475 |
55 | 550 |
Angle of Parking | Stall Width (feet) | Stall Depth (feet) | Driveway Width | |
---|---|---|---|---|
One-Way (feet) | Two-Way (feet) | |||
90° | 10 | 20 | 24 | 24 |
60° | 10 | 20 | 18 | 21 |
45° | 10 | 20 | 15 | 18 |
Acer saccharum - sugar maple |
Betula nigra - river birch |
Carpinus caroliniana - ironwood/American hornbeam |
Carya alba - mockernut hickory |
Carya glabra - pignut hickory |
Carya ovata - shagbark hickory |
Celtis occidentalis - hackberry |
Fagus grandifolia - American beech |
Gleditsia triacanthos inermis - thornless honey locust |
Liquidambar styraciflua - sweetgum |
Liriodendron tulipifera - tulip poplar Nyssa sylvatica - black gum/tupelo |
Ostrya virginiana - Eastern hophornbeam |
Oxydendrum arboreum - sourwood |
Platanus occidentalis - American sycamore |
Quercus alba - white oak |
Quercus bicolor - swamp white oak |
Quercus coccinea - scarlet oak |
Quercus imbricaria - shingle oak |
Quercus phellos - willow oak |
Quercus prinus - chestnut oak |
Quercus rubra - red oak |
Quercus velutina - black oak |
Sassafras albidum - sassafras |
Tilia americana - American linden |
Amelanchier arborea - downy serviceberry |
Amelanchier canadensis - shadblow serviceberry |
Amelanchier laevis - shadbush/Allegheny serviceberry |
Cercis canadensis - Eastern redbud |
Chionanthus virginicus - fringetree |
Cornus florida - flowering dogwood |
Crataegus viridis "Winter King" - Winter King hawthorne |
Magnolia virginiana - sweetbay magnolia |
Prunus americana - American plum |
Prunus pensylvanica - pin cherry |
Ilex opaca - American holly |
Juniperus virginiana - Eastern red cedar |
Pinus strobus - Eastern white pine |
Pinus virginiana - Virginia pine |
Aesculus parviflora - bottlebrush buckeye |
Aesculus pavia - red buckeye |
Aronia arbutifolia - red chokeberry |
Aronia melanocarpa - black chokeberry |
Callicarpa americana - American beautyberry |
Calycanthus floridus - sweetshrub |
Ceanothus americanus - New Jersey tea |
Clethra alnifolia - summersweet |
Cornus alternifolia - pagoda dogwood |
Cornus amomum - silky dogwood |
Cornus racemosa - gray dogwood |
Cornus sericea - red osier/red-twig dogwood |
Corylus americana - American hazelnut |
Hamamelis virginiana - witchhazel |
Hydrangea quercifolia - oakleaf hydrangea |
Hydrangea arborescens - smooth hydrangea |
Ilex glabra - inkberry holly |
Ilex verticillata - winterberry |
Itea virginica - Virginia sweetspire |
Lindera benzoin - spicebush |
Morella pensylvanica - bayberry (aka Myrica) |
Physocarpus opulifolius - ninebark |
Rhododendron calendulaceum - flame azalea |
Rhus aromatica - fragrant sumac |
Rhus hirta - staghorn sumac |
Rubus odoratus - purple flowering raspberry |
Rubus strigosus - American red raspberry |
Salix discolor - pussy willow |
Salix nigra - black willow |
Sambucus canadensis - elderberry |
Vaccinium corymbosum - highbush blueberry |
Vaccinium angustifolium - lowbush blueberry |
Viburnum acerifolium - mapleleaf viburnum |
Viburnum dentatum - arrowwood viburnum |
Viburnum lentago - nannyberry viburnum |
Viburnum nudum - possumhaw viburnum |
Viburnum prunifolium - blackhaw viburnum |
Andropogon gerardii - big bluestem |
Carex pensylvanica - Pennsylvania sedge |
Carex vulpinoidea - fox sedge |
Chasmanthium Iatifolium - northern sea oats |
Deschampsia cespitosa - tufted hair grass |
Eragrostis spectabilis - purple lovegrass |
Panicum virgatum - switch grass |
Schizachyrium scoparium - little bluestem |
Sorghastrum nutans - indian grass |
Athyrium filix-femina - lady fern |
Dennstaedtia punctilobula - hay-scented fern |
Matteuccia struthiopteris - ostrich fern |
Onoclea sensibilis - sensitive fern |
Osmunda cinnamomea - cinnamon fern |
Polystichum acrostichoides - christmas fern |
Mitchella repens - partridgeberry |
Pachysandra procumbens - Allegheny spurge |
Senecio aureus - golden ragwort |
Bignonia capreolata - cross vine |
Lonicera sempervirens - trumpet honeysuckle |
Parthenocissus quinquefolia - Virginia creeper |
Acer saccharum - sugar maple |
Gleditsia triacanthos inermis - thornless honey locust |
Liquidambar styraciflua - sweetgum |
Nyssa sylvatica - black gum tupelo |
Quercus alba - white oak |
Quercus rubra - northern red oak |
Quercus coccinea - scarlet oak |
Tilia americana - American linden |
Cornus florida - flowering dogwood |
Crataegus viridis "Winter King" - Winter King hawthorne |
Magnolia virginiana - sweetbay magnolia |
Asclepias incarnata - swamp milkweed |
Helianthus - sunflower |
Iris versicolor - blue flag iris |
Lobelia cardinalis - cardinal flower |
Panicum virgatum - switch grass |
Pycnanthemum virginianum - mountain mint |
Rudbeckia nitida - shining coneflower |
Vernonia fasciculata - ironweed |
Symphyotrichum novae-angliae - New England aster |
Agastache scrophulariifolia - giant purple hyssop |
Aronia arbutifolia - red chokeberry |
Caltha palustris - marsh marigold |
Cephalanthus occidentalis - buttonbush |
Chelone glabra - white turtlehead |
Gentiana andrewsii - bottle gentian |
Eupatorium dubium - common joe-pye weed |
Hibiscus moscheutos - swamp rose mallow |
Typha - cattails |
Woody Species: |
Amelanchier canadensis - shadbush |
Betula nigra - river birch |
Cercis canadensis - eastern redbud |
Cornus sericea - red osier dogwood |
Ilex verticillata - winterberry holly |
Liquidambar styraciflua - sweet gum |
Nyssa sylvatica - black gum |
Populus tremuloides - quaking aspen |
Salix discolor - pussy willow |
Acer rubrum - red maple/swamp maple |
Amelanchier canadensis - Shadblow serviceberry |
Amelanchier arborea - downy serviceberry |
Carpinus caroliniana - American hornbeam |
Ilex opaca - American holly |
Liquidambar styraciflua - sweet gum |
Magnolia virginiana - sweet bay magnolia |
Platanus occidentalis - American plane tree |
Quercus bicolor - swamp white oak |
Thuja occidentalis - eastern arborvitae |
Tilia americana - American linden |
Betula nigra - river birch |
Nyssa sylvatica - blackgum/tupelo |
Chamaecyparis thyoides - Atlantic white cedar |
Liriodendron tulipifera - tuliptree |
Cercis canadensis - eastern redbud |
Populus tremuloides - quaking aspen |
Aesculus parviflora - bottlebrush buckeye |
Aronia arbutifolia - red chokeberry |
Aronia melanocarpa - black chokeberry |
Calycanthus floridus - Carolina allspice/sweetshrub |
Chionanthus virginicus - white fringe tree |
Comptonia peregrina - sweet fern |
Cornus sericea - red osier dogwood |
Ilex glabra - inkberry holly |
Ilex verticillata - winterberry holly |
Lindera benzoin - spicebush |
Salix nigra - black willow |
Salix discolor - pussy willow |
Viburnum nudum - withe-rod |
Viburnum dentatum - arrowwood viburnum |
Viburnum lentago - nannyberry |
Viburnum opulus - American cranberry bush |
Cephalanthus occidentalis - button bush |
Morella caroliniensis - swamp bayberry |
Itea virginica - Virginia sweetspire |
Cornus amomum - silky dogwood |
Physocarpus opulifolius - ninebark |
Sambucus nigra - elderberry |
Celtis occidentalis - hackberry |
Gleditsia triacanthos var. inermis - thornless honey locust |
Juniperus virginiana - eastern red cedar |
Quercus coccinea - scarlet oak |
Quercus macrocarpa - bur oak |
Robinia pseudoacacia - black locust |
Sassafras albidum - sassafras |
Nyssa sylvatica - blackgum/tupelo |
Quercus rubra - red oak |
Thuja occidentalis - eastern arborvitae |
Comptonia peregrina - sweet fern |
Cornus racemosa - gray dogwood |
Hamamelis virginiana - common witchhazel |
Morella pensylvanica - northern bayberry |
Rhus aromatica - fragrant sumac |
Rhus glabra - smooth sumac |
Rhus typhina - staghorn sumac |
Salix nigra - black willow |
Viburnum lentago - nannyberry |
Clethra alnifolia - summersweet |
Viburnum acerifolium - mapleleaf viburnum |
Comptonia peregrina - sweet fern |
Cytisus x. praecox - Warminster broom |
Diervilla sessilifolia - southern bush honeysuckle |
Morella pensylvanica - northern bayberry |
Rhus aromatica - fragrant sumac |
Rhus copallinum - shining sumac |
Rosa nitida - shining rose |
Viburnum lentago - nannyberry |
Acer saccharum - sugar maple |
Betula nigra - river birch |
Carpinus caroliniana - ironwood/American hornbeam |
Carya alba - mockernut hickory |
Carya glabra - pignut hickory |
Carya ovata - shagbark hickory |
Celtis occidentalis - hackberry |
Fagus grandifolia - American beech |
Gleditsia triacanthos inermis - thornless honey locust |
Liquidambar styraciflua - sweetgum |
Liriodendron tulipifera - tulip poplar Nyssa sylvatica - black gum/tupelo |
Ostrya virginiana - Eastern hophornbeam |
Oxydendrum arboreum - sourwood |
Platanus occidentalis - American sycamore |
Quercus alba - white oak |
Quercus bicolor - swamp white oak |
Quercus coccinea - scarlet oak |
Quercus imbricaria - shingle oak |
Quercus phellos - willow oak |
Quercus prinus - chestnut oak |
Quercus rubra - red oak |
Quercus velutina - black oak |
Sassafras albidum - sassafras |
Tilia americana - American linden |
Amelanchier arborea - downy serviceberry |
Amelanchier canadensis - shadblow serviceberry |
Amelanchier laevis - shadbush/Allegheny serviceberry |
Cercis canadensis - Eastern redbud |
Chionanthus virginicus - fringetree |
Cornus florida - flowering dogwood |
Crataegus viridis "Winter King" - Winter King hawthorne |
Magnolia virginiana - sweetbay magnolia |
Prunus americana - American plum |
Prunus pensylvanica - pin cherry |
Ilex opaca - American holly |
Juniperus virginiana - Eastern red cedar |
Pinus strobus - Eastern white pine |
Pinus virginiana - Virginia pine |
Aesculus parviflora - bottlebrush buckeye |
Aesculus pavia - red buckeye |
Aronia arbutifolia - red chokeberry |
Aronia melanocarpa - black chokeberry |
Callicarpa americana - American beautyberry |
Calycanthus floridus - sweetshrub |
Ceanothus americanus - New Jersey tea |
Clethra alnifolia - summersweet |
Cornus alternifolia - pagoda dogwood |
Cornus amomum - silky dogwood |
Cornus racemosa - gray dogwood |
Cornus sericea - red osier/red-twig dogwood |
Corylus americana - American hazelnut |
Hamamelis virginiana - witchhazel |
Hydrangea quercifolia - oakleaf hydrangea |
Hydrangea arborescens - smooth hydrangea |
Ilex glabra - inkberry holly |
Ilex verticillata - winterberry |
Itea virginica - Virginia sweetspire |
Lindera benzoin - spicebush |
Morella pensylvanica - bayberry (aka Myrica) |
Physocarpus opulifolius - ninebark |
Rhododendron calendulaceum - flame azalea |
Rhus aromatica - fragrant sumac |
Rhus hirta - staghorn sumac |
Rubus odoratus - purple flowering raspberry |
Rubus strigosus - American red raspberry |
Salix discolor - pussy willow |
Salix nigra - black willow |
Sambucus canadensis - elderberry |
Vaccinium corymbosum - highbush blueberry |
Vaccinium angustifolium - lowbush blueberry |
Viburnum acerifolium - mapleleaf viburnum |
Viburnum dentatum - arrowwood viburnum |
Viburnum lentago - nannyberry viburnum |
Viburnum nudum - possumhaw viburnum |
Viburnum prunifolium - blackhaw viburnum |
Andropogon gerardii - big bluestem |
Carex pensylvanica - Pennsylvania sedge |
Carex vulpinoidea - fox sedge |
Chasmanthium Iatifolium - northern sea oats |
Deschampsia cespitosa - tufted hair grass |
Eragrostis spectabilis - purple lovegrass |
Panicum virgatum - switch grass |
Schizachyrium scoparium - little bluestem |
Sorghastrum nutans - indian grass |
Athyrium filix-femina - lady fern |
Dennstaedtia punctilobula - hay-scented fern |
Matteuccia struthiopteris - ostrich fern |
Onoclea sensibilis - sensitive fern |
Osmunda cinnamomea - cinnamon fern |
Polystichum acrostichoides - christmas fern |
Mitchella repens - partridgeberry |
Pachysandra procumbens - Allegheny spurge |
Senecio aureus - golden ragwort |
Bignonia capreolata - cross vine |
Lonicera sempervirens - trumpet honeysuckle |
Parthenocissus quinquefolia - Virginia creeper |
Acer saccharum - sugar maple |
Gleditsia triacanthos inermis - thornless honey locust |
Liquidambar styraciflua - sweetgum |
Nyssa sylvatica - black gum tupelo |
Quercus alba - white oak |
Quercus rubra - northern red oak |
Quercus coccinea - scarlet oak |
Tilia americana - American linden |
Cornus florida - flowering dogwood |
Crataegus viridis "Winter King" - Winter King hawthorne |
Magnolia virginiana - sweetbay magnolia |
Asclepias incarnata - swamp milkweed |
Helianthus - sunflower |
Iris versicolor - blue flag iris |
Lobelia cardinalis - cardinal flower |
Panicum virgatum - switch grass |
Pycnanthemum virginianum - mountain mint |
Rudbeckia nitida - shining coneflower |
Vernonia fasciculata - ironweed |
Symphyotrichum novae-angliae - New England aster |
Agastache scrophulariifolia - giant purple hyssop |
Aronia arbutifolia - red chokeberry |
Caltha palustris - marsh marigold |
Cephalanthus occidentalis - buttonbush |
Chelone glabra - white turtlehead |
Gentiana andrewsii - bottle gentian |
Eupatorium dubium - common joe-pye weed |
Hibiscus moscheutos - swamp rose mallow |
Typha - cattails |
Woody Species: |
{i1}Amelanchier canadensis - shadbush |
{i1}Betula nigra - river birch |
{i1}Cercis canadensis - eastern redbud |
{i1}Cornus sericea - red osier dogwood |
{i1}Ilex verticillata - winterberry holly |
{i1}Liquidambar styraciflua - sweet gum |
{i1}Nyssa sylvatica - black gum |
{i1}Populus tremuloides - quaking aspen |
{i1}Salix discolor - pussy willow |
Acer rubrum - red maple/swamp maple |
Amelanchier canadensis - Shadblow serviceberry |
Amelanchier arborea - downy serviceberry |
Carpinus caroliniana - American hornbeam |
Ilex opaca - American holly |
Liquidambar styraciflua - sweet gum |
Magnolia virginiana - sweet bay magnolia |
Platanus occidentalis - American plane tree |
Quercus bicolor - swamp white oak |
Thuja occidentalis - eastern arborvitae |
Tilia americana - American linden |
Betula nigra - river birch |
Nyssa sylvatica - blackgum/tupelo |
Chamaecyparis thyoides - Atlantic white cedar |
Liriodendron tulipifera - tuliptree |
Cercis canadensis - eastern redbud |
Populus tremuloides - quaking aspen |
Aesculus parviflora - bottlebrush buckeye |
Aronia arbutifolia - red chokeberry |
Aronia melanocarpa - black chokeberry |
Calycanthus floridus - Carolina allspice/sweetshrub |
Chionanthus virginicus - white fringe tree |
Comptonia peregrina - sweet fern |
Cornus sericea - red osier dogwood |
Ilex glabra - inkberry holly |
Ilex verticillata - winterberry holly |
Lindera benzoin - spicebush |
Salix nigra - black willow |
Salix discolor - pussy willow |
Viburnum nudum - withe-rod |
Viburnum dentatum - arrowwood viburnum |
Viburnum lentago - nannyberry |
Viburnum opulus - American cranberry bush |
Cephalanthus occidentalis - button bush |
Morella caroliniensis - swamp bayberry |
Itea virginica - Virginia sweetspire |
Cornus amomum - silky dogwood |
Physocarpus opulifolius - ninebark |
Sambucus nigra - elderberry |
Celtis occidentalis - hackberry |
Gleditsia triacanthos var. inermis - thornless honey locust |
Juniperus virginiana - eastern red cedar |
Quercus coccinea - scarlet oak |
Quercus macrocarpa - bur oak |
Robinia pseudoacacia - black locust |
Sassafras albidum - sassafras |
Nyssa sylvatica - blackgum/tupelo |
Quercus rubra - red oak |
Thuja occidentalis - eastern arborvitae |
Comptonia peregrina - sweet fern |
Cornus racemosa - gray dogwood |
Hamamelis virginiana - common witchhazel |
Morella pensylvanica - northern bayberry |
Rhus aromatica - fragrant sumac |
Rhus glabra - smooth sumac |
Rhus typhina - staghorn sumac |
Salix nigra - black willow |
Viburnum lentago - nannyberry |
Clethra alnifolia - summersweet |
Viburnum acerifolium - mapleleaf viburnum |
Comptonia peregrina - sweet fern |
Cytisus x. praecox - Warminster broom |
Diervilla sessilifolia - southern bush honeysuckle |
Morella pensylvanica - northern bayberry |
Rhus aromatica - fragrant sumac |
Rhus copallinum - shining sumac |
Rosa nitida - shining rose |
Viburnum lentago - nannyberry |
Tree Size (inches) | Amount of Preservation Required* |
---|---|
6 to 12 | 60%; 40% if replacement trees are provided |
13 to 24 | 70%; 50% if replacement trees are provided |
25 to 48 | 90% |
Over 48 | 100% |
*Total caliper (diameter) inches is determined for all trees of each size; the preservation percentage requirement is multiplied by the total caliper-inches to determine how many caliper-inches should be preserved. |
Type of Development | Minimum Average Footcandle Level | |
---|---|---|
Shopping centers and other commercial areas | 2.0 | |
Industrial and office developments | 1.0 | |
Recreational areas | 1.0 | |
Multifamily, townhouse residential areas | 0.6 - 0.8 | |
Residential streets | 0.4 | |
Sidewalks | 0.2 | |
Pedestrian walkways | 0.4 |
D.1. | Design criteria for groundwater recharge via best management practices | |||
(1) | Designers are referred to the Pennsylvania Handbook of Best Management Practices for Developing Areas, dated Spring 1998 or latest edition as amended, as prepared for the Pennsylvania Association of Conservation District, Inc., and the Pennsylvania Department of Environmental Protection. | |||
(2) | Stormwater runoff peak rate determinations will be determined as outlined in § 153-38C. The volume of groundwater recharge on sites shall be maintained at predevelopment levels to assure that there is no reduction of the annual recharge to the groundwater reservoir resulting in a lowering of the base flow of streams and of the water supplied to wells. | |||
(3) | The suitability of soils for infiltration shall be determined from the Soil Survey of Bucks County (1975 Edition) or latest edition as amended and from on-site soil testing. A minimum infiltration of 0.5 inches per hour is required in the soil horizon in which the infiltration device bottom is situated. | |||
(4) | Best management practices shall be selected with primary emphasis on infiltration through upper soil horizons, through wooded grounds, grassy areas and infiltration berms, with secondary emphasis on below ground infiltration devices. | |||
(5) | Design criteria for infiltration systems. | |||
(a) | Soil infiltration tests shall be made to a depth of not less than three feet below the bottom of the infiltration beds established by the Bucks County Department of Health. All infiltration methods shall be designed to handle the ten-year storm. Seventy-five percent of the tested percolation rate shall be used to determine the storage volume required. | |||
(b) | All infiltration systems shall be sized to store the net increase in stormwater volume resulting from site disturbance, using the two-year frequency rainfall (3.3 inches in 24 hours) without consideration of infiltration during precipitation. | |||
(c) | All infiltration systems shall mitigate the peak rate of runoff from the site to the predisturbance condition, using the one-hundred-year frequency rainfall (7.2 inches in 24 hours) with consideration of the estimated soil infiltration during precipitation. | |||
(d) | All roof drains shall discharge into infiltration systems, with appropriate measures to prevent vegetative clogging. | |||
(e) | Where sediment transport is anticipated in the stormwater runoff reaching the infiltration systems, appropriate measures to prevent or collect sediment shall be installed prior to discharge. | |||
(f) | Infiltration systems shall not be situated within 50 feet of any sewage bed or stream. They shall have a minimum setback of 15 feet from any residential structure, and if possible, shall be situated down gradient from such structures. | |||
(g) | All surface and subsurface infiltration systems shall have positive overflow controls, and storage volumes shall be computed from this invert. | |||
(h) | All infiltration systems shall be designed to empty the total design storm volume within 24 hours or less following rainfall. | |||
(i) | All subsurface infiltration systems shall utilize a permeable geotextile to separate aggregate beds or structures from soil, to prevent loss of bed capacity. | |||
(6) | Maintenance of best management practices. | |||
(a) | A description of maintenance activities and a maintenance schedule and management plan for best management practices shall be submitted and made part of the Stormwater Management Plan. | |||
(b) | Individual lot best management facilities are the responsibility of each lot owner. Their performance shall be guaranteed with a written and executed maintenance agreement with perpetual deed restrictions. This agreement must provide assurances that no action will be taken by the lot owner to disrupt in any way or impair the effectiveness of the best management facilities. This agreement must be attached to and made part of the building permit requirements for the lot. | |||
(c) | Where Doylestown Township has accepted an offer of dedication, including maintenance responsibilities for stormwater management facilities, a financial security and/or maintenance fee shall be provided by the developer. |
TABLE 1 | |||||
---|---|---|---|---|---|
ALLOWABLE WATER VELOCITIES | |||||
Permissible velocities for channels lined with vegetation1 | |||||
The values apply to average, uniform stands of each type of cover. | |||||
Permissible Velocity (feet per second) | |||||
Cover | Slope Range2 (percent) | Erosion-Resistant Soils | Easily Eroded Soils | ||
Bermuda grass | 0-5 | 3 | 6 | ||
5-10 | 7 | 5 | |||
Over 10 | 6 | 4 | |||
Buffalo grass, Kentucky bluegrass, smooth brome or blue grama | 0-5 | 7 | 5 | ||
5-10 | 6 | 4 | |||
Over 10 | 5 | 3 | |||
Grass mixture2 | 0-5 | 5 | 4 | ||
5-10 | 4 | 3 | |||
Lespedeza sericea,3 weeping love grass,3 yellow bluestem,3 kudzu, alfalfa3 or crabgrass3 | 0-5 | 3.5 | 2.5 | ||
Common lespedeza4 or Sudan grass4 | 0-5 | 3.5 | 2.5 |
NOTES: 1Use velocities exceeding five feet per second only where good covers and proper maintenance can be obtained. | |||||
2Do not use on slopes steeper than 10% except for side slopes on a combination channel. | |||||
3Do not use on slopes steeper than 5% except for side slopes in a combination channel. | |||||
4Annuals: used on mild slopes or as temporary protection until permanent covers are established. Use on slopes steeper than 5% is not recommended. |
Description of Area | Runoff Coefficient (C) | ||
---|---|---|---|
Residential | |||
2-acre single-family detached lots | 0.40 | ||
1-acre single-family detached lots | 0.46 | ||
1/2-acre single-family detached lots | 0.50 | ||
1/4-acre single-family detached lots | 0.56 | ||
Two-family and multifamily | 0.70 | ||
Commercial | 0.75 | ||
Industrial | 0.80 | ||
Parks and cemeteries | 0.38 | ||
Unimproved | 0.35 | ||
Where the table is not applicable, the following factors may be used: | |||
Roofs and all impervious surfaces | 0.90 | ||
All other surfaces except forest | 0.40 | ||
Forest | 0.30 |
Storm Frequency (years) | Factors | |
---|---|---|
10 and less | 1.0 | |
25 | 1.1 | |
50 | 1.2 |
Table 2 | ||||||
---|---|---|---|---|---|---|
Type M and S Inlet Capacities (In Swale) | ||||||
Back Slope | ||||||
Grade | 2:1 | 4:1 | 6:1 | 12:1 | Dike | |
1.0 | 3.2 | 3.6 | 3.9 | 4.1 | 9.1 | |
2.0 | 3.5 | 3.5 | 3.5 | 3.7 | 8.3 | |
3.0 | 2.5 | 2.8 | 3.5 | 3.5 | 7.4 | |
4.0 | 1.6 | 2.0 | 3.4 | 3.2 | 6.4 | |
5.0 | 1.6 | 2.0 | 3.5 | 3.0 | 6.3 | |
6.0 | 1.6 | 2.0 | 3.3 | 2.8 | 6.1 | |
7.0 | 1.5 | 2.0 | 3.0 | 2.6 | 6.0 | |
8.0 | 1.5 | 2.0 | 2.8 | 2.4 | 5.8 |