When conditions permit, centerline offsets should be at least
two hundred feet (200'). Greater centerline offsets as may be required
by the City Engineer shall be planned where necessary for traffic
safety.
|
Exceptions: Hammerhead dead-end streets shall be a minimum of
60 feet allowing room for a fire truck to pull up and back to be able
to go back[.]
|
Street Classification
|
Functions - Uses
|
---|---|
Local Street
|
A street which distributes traffic to and from residences. It
is short in length and noncontinuous to discourage through traffic.
It serves low-density residential/single-family uses.
|
Minor Collector
|
A street which carries traffic from local streets to other collector
streets. Also, it may serve local facilities such as schools and churches,
low and medium density residential, limited commercial facilities,
elementary schools, some small offices and as direct access within
industrial parks.
|
Major Collector
|
A street which carries traffic from collector streets to arterials.
Also, it may serve local facilities such as schools, churches, fast
food restaurants and mini-malls, medium and high density residential,
limited commercial facilities, elementary schools, offices and as
direct access within industrial parks.
|
Minor Arterial
|
A street which receives traffic from collectors and distributes
traffic to major arterials and activity centers. Also, it may feed
through-traffic to freeways. Further it serves uses such as high schools,
universities, other major educational/vocational facilities, and concentrations
of high-density residential, commercial facilities.
|
Major Arterial
|
A street which receives traffic from collectors and distributes
it to major activity centers. Also, it feeds through-traffic to freeways.
Further it serves uses such as universities, other major educational
facilities, concentrations of high-density commercial, regional commercial
facilities, other concentrated commercial facilities, industrial complexes,
and major public facilities such as airports.
|
Freeways/Controlled Access Highways
|
Freeways carry all types of traffic. They receive traffic from
collectors and arterials and distribute traffic to major activity
centers. Traffic on freeways does not stop, and all intersections
are grade-separated.
|
GENERAL DESIGN CRITERIA
| |||
---|---|---|---|
Street Classification
|
Minimum Right-of-Way
|
Minimum Roadway Width
(Face to Face)
|
Parkway Width
|
Local Street
|
50'
|
30'
|
10'
|
Minor Collector
|
60'
|
36'
|
12'
|
Major Collector
|
80'
|
53'
|
12'
|
Minor Arterial
|
100'
|
Two @ 28' each plus center turn facilities when required
|
12'
|
Major Arterial
|
120'
|
Two @ 40' plus center turn facilities
|
12'
|
Freeway
|
|
TxDOT Standards
|
|
TABLE 1
| ||||
---|---|---|---|---|
Street Classification
|
Minimum Design Speed
(MPH)
|
Maximum Percent Grade
|
Minimum Percent Grade
|
Area free from stormwater, using a five-year frequency storm
|
Local Street
|
30
|
10
|
0.6
|
N.A.
|
Minor Collector
|
30
|
6
|
0.6
|
N.A.
|
Major Collector
|
40
|
6
|
0.6
|
One lane (normally the center 12')
|
Arterials
|
50
|
6
|
0.6
|
One lane each direction
|
When streets classified as Collector or Arterial are platted
with curves, the degree of curvature shall be such so that the street
when constructed will meet the requirements for horizontal curves
and minimum stopping sight distance, etc., for the design speed, in
accordance with good engineering practice.
|
Pipe Size (in. DIA)
|
Width of Easement
|
---|---|
Sanitary Sewer Pipe 15" thru 21
|
"20 ft.
|
Sanitary Sewer Pipe 24" thru 30"
|
25 ft.
|
Sanitary Sewer Pipe 36" and above
|
30 ft.
|
Water Pipe 15" thru 21"
|
20 ft.
|
Water Pipe 24" thru 42"
|
25 ft.
|
Water Pipe 48" and above
|
30 ft.
|
One single pole sign with said pole not to exceed twelve (12)
inches in diameter and with every portion of said sign allowing a
minimum height clearance between it and the ground of eleven (11)
feet.
|
Pipe Size
|
Width of Easement
|
---|---|
30" thru 42"
|
25 ft.
|
48" thru 60"
|
30 ft.
|
The width of the easements described in Paragraphs 1 through
4 above shall be substantiated by a drainage study and drainage calculations
or other criteria submitted to and approved by the City Engineer.
|
Floodway Restriction Statement
|
No construction, without the written approval of the City of
River Oaks shall be allowed within an identified “FIRM”
floodway area, and then only after detailed floodplain development
permit including engineering plans and studies show that no rise in
the Base Flood Elevation (BFE) will result, that no flooding will
result, that no obstruction to the natural flow of water will result;
and subject to all owners of the property affected by such construction
becoming a party to the request. Where construction is permitted,
all finished floor elevations shall be a minimum of two feet (2')
above the 100-year flood elevation.
|
Q
|
=
|
Discharge or surface runoff in cubic feet per second.
|
C
|
=
|
Coefficient of runoff -
|
0.35 for parks and undeveloped areas
| ||
0.50 for single-family or duplex residential areas
| ||
0.80 for multifamily residential areas
| ||
1.00 for paved, commercial, and industrial areas
| ||
I
|
=
|
Intensity of runoff in inches per hour.
|
A
|
=
|
Drainage areas in acres.
|
*Type of Facility
|
Description of Area to be Drained
|
Maximum Allowable Time of Concentration
(Minutes)
|
Recommended Design Frequency
(Years)
|
---|---|---|---|
Storm Sewers
|
Residential, Commercial and Manufacturing
|
20
|
25
|
Culverts, Bridges, Channels and Creeks
|
Any type of area less than 100 acres
|
30
|
100
|
Culverts, Bridges, Channels and Creeks
|
Any type of area greater than 100 acres but less than 1,000
acres
|
45
|
100
|
Culverts, Bridges, Channels and Creeks
|
Any type of area greater than 1,000 acres
|
60
|
100
|
*In all cases, the discharge from a 100-year rain event for
“fully developed conditions” shall be completely carried
within a drainage easement and/or R.O.W.
|