Subwatershed
|
Release Rate Percentage
| |
---|---|---|
Core Creek (by subarea)
11.5, 11.7
11.6
11.61
|
100%
50%
50%
| |
Lower Main Stem (by subarea)
10.4, 14.6
14.7 (pertaining to drainage areas wholly within Middletown
Township
|
100%
50%
|
Subwatershed
| ||
---|---|---|
Core Creek (by subarea)
11.62, 11.63
|
Direct discharge
|
Subwatershed
| |
---|---|
Lower reaches of Main Stream (by subarea)
15.1, 15.2, 15.3, 15.4, 15.5
|
Wet pond and artificial wetland BMPs shall be constructed on
hydric or wet soils and/or on soils which have an infiltration rate
and percolation rate of less than 0.2 inches/hour.
|
Return Period
(year)
|
24-Hour Rainfall Depth
(inches)
| |
---|---|---|
1
|
2.7
| |
2
|
3.3
| |
5
|
4.2
| |
10
|
5.0
| |
25
|
5.8
| |
50
|
6.4
| |
100
|
7.2
|
Table 1
Allowable Water Velocities
| ||||
---|---|---|---|---|
Material
|
Allowable Velocity
(feet per second)
| |||
1.
|
Well-established grass on good soil:
| |||
Short pliant-bladed grass
|
5 to 6
| |||
Bunch grass, soil exposed
|
2 to 4
| |||
Stiff-stemmed grass
|
2 to 3
| |||
2.
|
Earth without vegetation:
| |||
Fine sand or silt
|
1 to 2
| |||
Ordinary firm loam
|
2 to 3
| |||
Stiff clay
|
3 to 5
| |||
Clay and gravel
|
4 to 5
| |||
Course gravel
|
4 to 5
| |||
Soft shale
|
5 to 6
| |||
3.
|
Shoulders:
| |||
Earth
|
See 2, Earth without vegetation, above
| |||
Stabilized
|
6
| |||
Paved
|
10 to 15
|
Minimum Requirements
| |||||
---|---|---|---|---|---|
Street Classification
|
Right-of-Way
(feet)
|
Cartway
(feet)
|
Curb
|
Sidewalk
| |
Arterial street
|
100
|
48*
|
*
|
*
| |
Collector street
|
80
|
40*
|
*
|
*
| |
Primary street
|
60
|
36
|
*
|
*
| |
Secondary street
|
50
|
26
|
*
|
*
| |
Rural roads
|
50
|
20
|
*
|
*
| |
Marginal access street
|
50
|
26
|
*
|
*
|
NOTE:
| ||
---|---|---|
*
|
As determined by the Pennsylvania Department of Highways where
state roads are involved or by the Board of Supervisors with the advice
of the Township Engineer for all other roads.
|
Housing Type
|
Average Weekday Trip Generation Rates
(trips/D.U.)
| |
---|---|---|
Single-family detached
|
10.0
| |
Duplex (twin), multiplex, townhouse, etc.
|
5.2
| |
Garden apartment, 1 or 2 floors
|
6.6
| |
Mid- and high-rise apartment, 3 or more floors
|
4.0
| |
Mobile home
|
4.8
| |
Retirement village
|
3.3
|
Housing Type
|
Spaces per D.U.
| |
---|---|---|
Single-family detached
|
1.5
| |
Attached units
|
1.0
| |
Apartments
|
0.5
|
Collector ADT Level
|
Percent of Allowable Frontage Taking Access from Collectors
Over Entire Length of Collector Street
| |
---|---|---|
1,000 to 1,199
|
20%
| |
1,200 to 1,599
|
10%
| |
1,600 to 1,999
|
5%
| |
2,000+
|
None
|
Y
|
=
|
Corner sight distance, measured from point "a" to point "c"
and point "c" to point "d"
| |
a and d
|
=
|
A point 3.5 feet above the center line of the major roadway
| |
b
|
=
|
Eye level from a car stopped at the intersection on the minor
road; for this chapter, "b" is situated 3.5 feet above the roadway
20 feet from the edge of paving of the major road
| |
c
|
=
|
Approximate center of intersection of 2 streets
|
Minimum Corner Sight Distance "Y"
| ||
---|---|---|
Major Road Type/Design Speed
|
Y
(feet)
| |
Existing street/50 mph
|
500
| |
Existing street/40 mph
|
400
| |
Residential collector/35 mph
|
350
| |
Residential subcollector/30 mph
|
300
| |
Residential access/25 mph
|
250
|
Major Road Type
|
Spacing
(in feet)
| |
---|---|---|
Existing
|
1,600
| |
Residential collector
|
300
| |
Residential subcollector
|
125
| |
Residential access
|
NA
|
Design Speed of Road
(mph)
|
Minimum Deceleration Lane Length
(feet)
| |
---|---|---|
30
|
165
| |
40
|
230
| |
50
|
310
|
Small Trees
| |
---|---|
Acer campestre — Hedge maple
| |
Acer ginnala — Amur maple*
| |
Crataegus x lavallei — Lavelle hawthorn*
| |
Crataegus phaenopyrum — Washington hawthorn*
| |
Crataegus viridis "winter king" — "Winter king" hawthorn*
| |
Koelreuteria paniculata — Golden raintree
| |
Malus baccata f. columnaris — Upright siberian crabapple*
| |
Malus floribunda — Japanese crabapple*
| |
Malus baccata "snowdrift" — "Snowdrift" crabapple*
| |
Prunus serrulata "kwanzan" — "Kwanzan"
| |
Flowering cherry
|
Large Trees
| |
---|---|
Acer platanoides — Norway maple
| |
Acer rubrum — Red maple
| |
Fraxinus americana — White ash
| |
Fraxinus pennsylvanica lanceolata — Green ash
| |
Ginko biloba — Ginko (male only)
| |
Gleditsia triacanthos inermis — Thornless honeylocust
| |
Liquidambar styraciflua — Sweet gum
| |
Phellodendron amurense — Amur cork tree
| |
Pyrus calleryana bradford — Bradford callery pear
| |
Quercus alba — White oak
| |
Quercus borealis — Red oak
| |
Quercus coccinea — Scarlet oak
| |
Sophora japonica — Japanese pagoda tree
| |
Tilia — Linden (all species hardy to the area)
| |
Zelkova serrata — Japanese zelkova
|
NOTE:
| ||
---|---|---|
*
|
Must be of the nursery stock trained for street tree use, i.e.,
single trunk with branching height six feet or greater.
|
Aisle Width
| |||||
---|---|---|---|---|---|
Type
|
One-Way
(feet)
|
Two-Way
(feet)
|
Stall Width
(feet)
|
Stall Depth**
(feet)
| |
Conventional
|
20
|
24
|
9***
|
18***
| |
Handicapped
|
20
|
24
|
In accordance with current ADA requirements
| ||
Oversized*
|
(As determined by the Township)
|
NOTES:
| ||
---|---|---|
*
|
Including, but not limited to, recreational vehicles, tandem
trailers, trucks and buses.
| |
**
|
Stall depth shall be measured from the curb or the tire stop
| |
***
|
Or as prescribed in the Middletown Township Zoning Ordinance (Chapter 500).
|
Aisle Width Variation
(in feet)
| ||||
---|---|---|---|---|
Angle of Parking
|
One-Way
|
Two-Way
|
Stall Depth Variation
(feet)
| |
90°
|
0
|
0
|
0
| |
60°
|
-2
|
-3
|
+1
| |
45°
|
-5
|
-4
|
0
| |
30°
|
-8
|
-4
|
-2
|