Design and Performance Standards
Angle of Parking (degrees) | Minumum Aisle Width (feet) | |
Parallel | 12 | |
30 | 12 | |
45 | 14 | |
60 | 18 | |
90 | 24 |
Q = CIA | |
Where | |
Q = The maximum expected discharge in cubic feet per second. | |
C = The runoff factor expressed as a percent of the total water falling on an area. | |
I = The rate of rainfall expressed in inches per hour for a ten-year storm frequency. | |
A = The drainage area expressed in acres. |
Table 1 Runoff Factors for the Rational Equation | |||
|---|---|---|---|
Type of Drainage Area of Surface | Runoff Factor C* | ||
Minimum | Maximum | ||
Roofs | 0.90 | 1.00 | |
Pavements: concrete or bituminous concrete | 0.75 | 0.95 | |
Pavements: bituminous macadam or surface treated gravel | 0.65 | 0.80 | |
Pavements: gravel, macadam, etc. | 0.25 | 0.60 | |
Sandy soil: cultivated or light growth | 0.10 | 0.30 | |
Sandy soil: woods or heavy brush | 0.10 | 0.30 | |
Gravel: bare or light growth | 0.20 | 0.40 | |
Gravel: woods or heavy brush | 0.10 | 0.35 | |
Clay soil: bare or light growth | 0.25 | 0.75 | |
Clay soil: woods or heavy growth | 0.15 | 0.60 | |
City business sections | 0.60 | 0.80 | |
Dense residential sections | 0.50 | 0.70 | |
Suburban, normal residential areas | 0.35 | 0.60 | |
Rural areas, parks, golf courses | 0.10 | 0.30 | |
NOTES: *In selecting the C factor, high values shall be applied to denser soils and steep slopes and consideration given to the future land uses in the drainage area, and a weighted value of C shall be given to a drainage area which contains several different types of ground cover. | |||
I | = | 190 25 + t | |
Where: I = The rate of rainfall expressed in inches per hour for a ten-year storm. t = The time of concentration. | |||
Table 2 Recommended Average Velocities of Runoff Flow for Determining Time of Concentration (feet per second) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Description of Course of Runoff Water | Slope (percent) | |||||||||
0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | |
Paved | 0.79 | 0.93 | 1.00 | 1.05 | 1.10 | 1.13 | 1.14 | 1.19 | 1.22 | 1.26 |
Bare shaley soil | 0.61 | 0.71 | 0.75 | 0.80 | 0.83 | 0.85 | 0.89 | 0.90 | 0.93 | 0.96 |
Bare soil | 0.51 | 0.55 | 0.58 | 0.63 | 0.65 | 0.66 | 0.68 | 0.70 | 0.72 | 0.74 |
Wild grass | 0.34 | 0.39 | 0.42 | 0.46 | 0.47 | 0.48 | 0.49 | 0.51 | 0.52 | 0.54 |
Average grass | 0.26 | 0.30 | 0.32 | 0.34 | 0.35 | 0.37 | .038 | 0.40 | 0.41 | 0.42 |
Dense grass | 0.20 | 0.23 | 0.25 | 0.27 | 0.28 | 0.29 | 0.30 | .030 | 0.31 | 0.32 |
Q = AV | ||
Where | ||
Q = The discharge of water in cubic feet per second. | ||
A = The net effective area in square feet provided by the drainage facility. | ||
V = The velocity of water in feet per second. | ||
NOTE: The discharge capacity for a drainage facility at a particular location shall be at least equal to the MED for that location. | ||
Use | Length of Site Frontage (feet) | Number of Driveways |
|---|---|---|
Residential | 200 or less | 1 |
Commercial | 200 or less | 1 |
Commercial on arterial or collector road | 200 to 500 | 2 |
All uses | Over 800 | To be determined by Land Use Board upon receipt of advice from the Township Engineer |
Allowable Speed on Road (mph) | Required Sight Distance (feet) | |
|---|---|---|
25 | 150 | |
30 | 200 | |
35 | 250 | |
40 | 300 | |
45 | 350 | |
50 | 400 |
Type of Development | One-way Operation Curbline Driveway | Two-way Operation Curbline Driveway | ||
|---|---|---|---|---|
Opening (feet) | Width (feet) | Opening (feet) | Width (feet) | |
5- to 10-family residence | 12 - 15 | 10 - 13 | 12 - 30 | 10 - 26 |
10-family or more | 12 - 30 | 10 - 26 | 24 - 36 | 24 - 46 |
Commercial and industry | 24 - 50 | 24 - 34 | 24 - 50 | 24 - 46 |
Service station | 15 - 36 | 12 - 34 | 24 - 36 | 20 - 34 |
Street Classification | R.O.W. Width (feet) | Traffic Lanes (feet) | Width between Curbs (feet) | Total Utility and Right-of-way Outside the Curbs* (feet) |
|---|---|---|---|---|
Arterial or major collector | 66 | 2 @ 12 | 40 | 26 |
Minor collector | 66 | 2 @ 12 | 40 | 26 |
Local street | 50 | 2 @ 12 | 40 | 10 |
NOTES: * Shall be a minimum of four inches deep topsoil stabilized, fertilized and seeded with grass. | ||||
Acer negundo (box elder) | |
Acer platanoides (Norway maple) | |
Acer platanoides schwedler (Shwdeler's maple) | |
Acer rubrum [red (swamp) maple] | |
Acer saccharinum (silver maple) | |
Ailianthus altissima (tree of heaven) | |
Betula (birch), all species | |
Catalpa, all species | |
Gingko biloba, female species only | |
Gleditsia (honey locust and thornless honey locust), all species | |
Juglans (walnut), all species | |
Paulownia (empress tree) | |
Platanus (plane or buttonwood), all species | |
Populus (poplar and cottonwood), all species | |
Quercus palustris (pin oak) | |
Salix (willow), all species | |
Ulmus (elm), all species | |
All fruit trees |
Design and Performance Standards
Angle of Parking (degrees) | Minumum Aisle Width (feet) | |
Parallel | 12 | |
30 | 12 | |
45 | 14 | |
60 | 18 | |
90 | 24 |
Q = CIA | |
Where | |
Q = The maximum expected discharge in cubic feet per second. | |
C = The runoff factor expressed as a percent of the total water falling on an area. | |
I = The rate of rainfall expressed in inches per hour for a ten-year storm frequency. | |
A = The drainage area expressed in acres. |
Table 1 Runoff Factors for the Rational Equation | |||
|---|---|---|---|
Type of Drainage Area of Surface | Runoff Factor C* | ||
Minimum | Maximum | ||
Roofs | 0.90 | 1.00 | |
Pavements: concrete or bituminous concrete | 0.75 | 0.95 | |
Pavements: bituminous macadam or surface treated gravel | 0.65 | 0.80 | |
Pavements: gravel, macadam, etc. | 0.25 | 0.60 | |
Sandy soil: cultivated or light growth | 0.10 | 0.30 | |
Sandy soil: woods or heavy brush | 0.10 | 0.30 | |
Gravel: bare or light growth | 0.20 | 0.40 | |
Gravel: woods or heavy brush | 0.10 | 0.35 | |
Clay soil: bare or light growth | 0.25 | 0.75 | |
Clay soil: woods or heavy growth | 0.15 | 0.60 | |
City business sections | 0.60 | 0.80 | |
Dense residential sections | 0.50 | 0.70 | |
Suburban, normal residential areas | 0.35 | 0.60 | |
Rural areas, parks, golf courses | 0.10 | 0.30 | |
NOTES: *In selecting the C factor, high values shall be applied to denser soils and steep slopes and consideration given to the future land uses in the drainage area, and a weighted value of C shall be given to a drainage area which contains several different types of ground cover. | |||
I | = | 190 25 + t | |
Where: I = The rate of rainfall expressed in inches per hour for a ten-year storm. t = The time of concentration. | |||
Table 2 Recommended Average Velocities of Runoff Flow for Determining Time of Concentration (feet per second) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Description of Course of Runoff Water | Slope (percent) | |||||||||
0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | |
Paved | 0.79 | 0.93 | 1.00 | 1.05 | 1.10 | 1.13 | 1.14 | 1.19 | 1.22 | 1.26 |
Bare shaley soil | 0.61 | 0.71 | 0.75 | 0.80 | 0.83 | 0.85 | 0.89 | 0.90 | 0.93 | 0.96 |
Bare soil | 0.51 | 0.55 | 0.58 | 0.63 | 0.65 | 0.66 | 0.68 | 0.70 | 0.72 | 0.74 |
Wild grass | 0.34 | 0.39 | 0.42 | 0.46 | 0.47 | 0.48 | 0.49 | 0.51 | 0.52 | 0.54 |
Average grass | 0.26 | 0.30 | 0.32 | 0.34 | 0.35 | 0.37 | .038 | 0.40 | 0.41 | 0.42 |
Dense grass | 0.20 | 0.23 | 0.25 | 0.27 | 0.28 | 0.29 | 0.30 | .030 | 0.31 | 0.32 |
Q = AV | ||
Where | ||
Q = The discharge of water in cubic feet per second. | ||
A = The net effective area in square feet provided by the drainage facility. | ||
V = The velocity of water in feet per second. | ||
NOTE: The discharge capacity for a drainage facility at a particular location shall be at least equal to the MED for that location. | ||
Use | Length of Site Frontage (feet) | Number of Driveways |
|---|---|---|
Residential | 200 or less | 1 |
Commercial | 200 or less | 1 |
Commercial on arterial or collector road | 200 to 500 | 2 |
All uses | Over 800 | To be determined by Land Use Board upon receipt of advice from the Township Engineer |
Allowable Speed on Road (mph) | Required Sight Distance (feet) | |
|---|---|---|
25 | 150 | |
30 | 200 | |
35 | 250 | |
40 | 300 | |
45 | 350 | |
50 | 400 |
Type of Development | One-way Operation Curbline Driveway | Two-way Operation Curbline Driveway | ||
|---|---|---|---|---|
Opening (feet) | Width (feet) | Opening (feet) | Width (feet) | |
5- to 10-family residence | 12 - 15 | 10 - 13 | 12 - 30 | 10 - 26 |
10-family or more | 12 - 30 | 10 - 26 | 24 - 36 | 24 - 46 |
Commercial and industry | 24 - 50 | 24 - 34 | 24 - 50 | 24 - 46 |
Service station | 15 - 36 | 12 - 34 | 24 - 36 | 20 - 34 |
Street Classification | R.O.W. Width (feet) | Traffic Lanes (feet) | Width between Curbs (feet) | Total Utility and Right-of-way Outside the Curbs* (feet) |
|---|---|---|---|---|
Arterial or major collector | 66 | 2 @ 12 | 40 | 26 |
Minor collector | 66 | 2 @ 12 | 40 | 26 |
Local street | 50 | 2 @ 12 | 40 | 10 |
NOTES: * Shall be a minimum of four inches deep topsoil stabilized, fertilized and seeded with grass. | ||||
Acer negundo (box elder) | |
Acer platanoides (Norway maple) | |
Acer platanoides schwedler (Shwdeler's maple) | |
Acer rubrum [red (swamp) maple] | |
Acer saccharinum (silver maple) | |
Ailianthus altissima (tree of heaven) | |
Betula (birch), all species | |
Catalpa, all species | |
Gingko biloba, female species only | |
Gleditsia (honey locust and thornless honey locust), all species | |
Juglans (walnut), all species | |
Paulownia (empress tree) | |
Platanus (plane or buttonwood), all species | |
Populus (poplar and cottonwood), all species | |
Quercus palustris (pin oak) | |
Salix (willow), all species | |
Ulmus (elm), all species | |
All fruit trees |