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Union City, IN Code of Ordinances
CITY OF UNION CITY, INDIANA CODE OF ORDINANCES
CITY OFFICIALS OF UNION CITY, INDIANA
ADOPTING ORDINANCE
TITLE I: GENERAL PROVISIONS
TITLE III: ADMINISTRATION
TITLE V: PUBLIC WORKS
TITLE VII: TRAFFIC CODE
TITLE IX: GENERAL REGULATIONS
TITLE XI: BUSINESS REGULATIONS
TITLE XIII: GENERAL OFFENSES
TITLE XV: LAND USAGE
TABLE OF SPECIAL ORDINANCES
PARALLEL REFERENCES
APPENDIX B: TABLES
   Table 1   Urban Runoff Coefficients
   Table 2   Rural Runoff Coefficients
   Table 3   Runoff Coefficients “C” by Land Use and Typical Inlet Times
   Table 4   Typical Values of Manning's “n”
   Table 5   Rainfall Depths for Various Return Periods and Storm Durations for Randolph County
   Table 6   Rainfall Intensities for Various Return Periods and Storm Durations for Randolph County
   Table 7   Maximum Permissible Velocities in Vegetal-Lined Channels
   Table 8   Roughness Coefficient (Manning's “n”) for Sheet Flow
TABLE I: URBAN RUNOFF COEFFICIENTS (1)
Type of Surface   Runoff Coefficient "C"
   Asphalt   0.85
   Concrete   0.90
   Roof   0.90
   Lawns (Sandy)
      Flat (0-2% Slope)   0.07
      Rolling (2-7% Slope)   0.12
      Steep (greater than 7%)   0.17
   Lawns (Clay)
      Flat (0-2% Slope)   0.15
      Rolling (2-7% Slope)   0.20
      Steep (greater than 7%)   0.30
(1)    From HERPICC Stormwater Drainage Manual - Revised July 1994.
TABLE 2: RURAL RUNOFF COEFFICIENTS (1)
Type of Surface   Runoff Coefficient "C"
   Woodland (Sandy)
      Flat (0-5% Slope)   0.10
      Rolling (5-10% Slope)   0.25
      Steep (greater than 10%)   0.30
   Woodland (Clay)
      Flat (0-5% Slope)   0.30
      Rolling (5-10% Slope)   0.35
      Steep (greater than 10%)   0.50
   Pasture (Sandy)
      Flat (0-5% Slope)   0.10
      Rolling (5-10% Slope)   0.16
      Steep (greater than 10%)    0.22
   Pasture (Clay)
      Flat (0-5% Slope)   0.30
      Rolling (5-10% Slope)   0.36
      Steep (greater than 10%)   0.42
   Cultivated (Sandy)
      Flat (0-5% Slope)   0.30
      Rolling (5-10% Slope)   0.40
      Steep (greater than 10%)   0.52
   Cultivated (Clay)
      Flat (0-5% Slope)   0.50
      Rolling (5-10% Slope)   0.60
      Steep (greater than 10%)   0.72
(1)    From HERPICC Stormwater Drainage Manual - Revised July 1994.
TABLE 3: RUNOFF COEFFICIENTS “C” BY LAND USE AND TYPICAL INLET TIMES
LAND USE
Runoff Coefficients
Inlet Time (minutes)
Flat
Rolling
Steep
Commercial (CBD)
0.75
0.83
0.90
5
Neighborhood Commercial
0.50
0.60
0.70
To be computed
Industrial
0.63
0.70
0.77
5-10
One-acre lots
0.26
0.30
0.34
10-15
Half-acre lots
0.31
0.35
0.39
Quarter-acre lots
0.36
0.40
0.44
Parkland
0.18
0.20
0.22
To be computed
 
   1.   Flat terrain: 0-2 % slopes.
   2.   Rolling terrain: 2-7% slopes.
   3.   Steep terrain: Greater than 7% slopes.
   4.   Interpolation, extrapolation and adjustment for local conditions shall be based on engineering experience and judgment.
TABLE 4: TYPICAL VALUES OF MANNING'S "n"(1)
         Desirable
Material    Manning's "n"   Maximum Velocities
Closed Conduits
   Concrete   0.013    15 feet per second
   HDPE   0.011   15 feet per second
   PVC   0.010   15 feet per second
   Vitrified Clay   0.013   15 feet per second
   Brick   0.015   15 feet per second
   Cast Iron   0.013   15 feet per second
   Circular Corrugated Metal Pipe,
      Annular Corrugations,
         2 x ½-inch
         Unpaved   0.024   7 feet per second
         25% Paved   0.021   7 feet per second
         50% Paved   0.018   7 feet per second
         100% Paved   0.013   7 feet per second
      Circular Corrugated Metal Pipe,
      Helical, 2 x ½-inch,
      Unpaved Corrugations
         12-inch   0.011
         15-inch   0.012
         18-inch   0.013
         24-inch   0.015
         36-inch   0.018
         48-inch   0.020
         60-inch or larger   0.021
Open Channels
      Concrete, trowel finish   0.013
      Concrete, broom or float finish   0.015
      Gunite   0.018
      Riprap, placed   0.030
      Riprap, dumped   0.035
      Gabion   0.030
   Earth (uniform, short grass, few weeds)   0.025   (See Table 7)
   Existing earth (fairly uniform, with some weeds)   0.030   (See Table 7)
   Uniform channel, dense growth of weeds   0.035   (See Table 7)
   Channel not maintained, dense weeds and brush 0.08 - 0.12   (See Table 7)
   Swale with grass   0.05   (See Table 7)
(1)    "n" values from Federal Highway Administration, 197
TABLE 5: RAINFALL DEPTHS FOR VARIOUS RETURN PERIODS AND STORM DURATIONS FOR RANDOLPH COUNTY
DEPTH (inches)
Duration
Return Period (years)
2
5
10
25
50
100
DEPTH (inches)
Duration
Return Period (years)
2
5
10
25
50
100
5 min.
0.43
0.50
0.56
0.64
0.71
0.78
10 min.
0.67
0.80
0.90
1.04
1.16
1.27
15 min.
0.84
1.02
1.14
1.33
1.48
1.62
20 min.
0.97
1.19
1.35
1.59
1.76
1.94
30 min.
1.11
1.38
1.58
1.86
2.07
2.29
40 min.
1.23
1.54
1.77
2.08
2.33
2.58
50 min.
1.32
1.66
1.92
2.26
2.54
2.81
60 min.
1.39
1.76
2.03
2.40
2.69
2.98
1.5 hrs.
1.65
2.04
2.28
2.62
2.96
3.18
2 hrs.
1.66
2.05
2.29
2.63
2.98
3.20
3 hrs.
1.77
2.29
2.53
2.92
3.17
3.54
4 hrs.
1.88
2.48
2.92
3.28
3.64
3.92
5 hrs.
1.95
2.60
3.00
3.35
3.70
4.05
6 hrs.
2.06
2.61
3.04
3.39
3.73
4.10
7 hrs.
2.10
2.80
3.15
3.78
4.13
4.55
8 hrs.
2.12
2.88
3.28
3.92
4.24
4.80
9 hrs.
2.16
2.97
3.33
3.96
4.32
4.86
10 hrs.
2.20
3.00
3.40
4.00
4.40
4.90
12 hrs.
2.50
3.05
3.48
4.03
4.44
4.95
14 hrs.
2.52
3.08
3.57
4.20
4.62
5.18
16 hrs.
2.56
3.20
3.68
4.24
4.70
5.20
18 hrs.
2.61
3.24
3.78
4.32
4.77
5.40
20 hrs.
2.68
3.40
3.80
4.40
4.80
5.46
24 hrs.
2.85
3.55
4.04
4.56
5.10
5.51
Data taken from Technical Paper #40, "Rainfall Frequency Atlas of the United States for Durations from 30 Minutes to 24 Hours and Return Periods from 1 to 100 Years." (1961) also from NWS Hydro35, "Five to 60-Minute Precipitation Frequency for Eastern and Central United States." (1977)
TABLE 6: RAINFALL INTENSITIES FOR VARIOUS RETURN PERIODS AND STORM DURATIONS FOR RANDOLPH COUNTY
Intensity (inches/hour)
Duration
Return period (years)
2
5
10
25
50
100
Intensity (inches/hour)
Duration
Return period (years)
2
5
10
25
50
100
5 min.
5.18
6.00
6.72
7.68
8.52
9.30
10 min.
4.02
4.80
5.40
6.24
6.96
7.62
15 min.
3.36
4.08
4.56
5.32
5.92
6.50
20 min.
2.91
3.57
4.05
4.77
5.28
5.82
30 min.
2.22
2.76
3.16
3.72
4.14
4.58
40 min.
1.84
2.31
2.66
3.12
3.49
3.87
50 min.
1.58
1.99
2.30
2.71
3.05
3.37
60 min.
1.39
1.76
2.03
2.40
2.69
2.98
1.5 hrs.
1.10
1.36
1.52
1.75
1.97
2.12
2 hrs.
0.83
1.02
1.14
1.31
1.49
1.60
3 hrs.
0.59
0.76
0.84
0.97
1.06
1.18
4 hrs.
0.47
0.62
0.73
0.82
0.91
0.98
5 hrs.
0.39
0.52
0.60
0.67
0.74
0.81
6 hrs.
0.35
0.43
0.51
0.56
0.62
0.68
7 hrs.
0.30
0.40
0.45
0.54
0.59
0.65
8 hrs.
0.26
0.36
0.41
0.49
0.53
0.60
9 hrs.
0.24
0.32
0.37
0.45
0.48
0.54
10 hrs.
0.22
0.30
0.34
0.40
0.44
0.49
12 hrs.
0.21
0.25
0.29
0.34
0.37
0.41
14 hrs.
0.18
0.22
0.25
0.30
0.33
0.37
16 hrs.
0.16
0.20
0.23
0.26
0.29
0.32
18 hrs.
0.14
0.18
0.21
0.24
0.26
0.30
20 hrs.
0.13
0.17
0.19
0.22
0.24
0.27
24 hrs.
0.12
0.15
0.17
0.19
0.21
0.23
Data taken from Technical Paper #40, "Rainfall Frequency Atlas of the United States for Durations from 30 Minutes to 24 Hours and Return Periods from 1 to 100 Years:" (1961) also from NWS Hydro35, "Five to 60-Minute Precipitation Frequency for Eastern and Central United States." (9977)
Table 7: PERMISSIBLE VELOCITIES IN VEGETAL-LINED CHANNELS (a)
 
COVER
Slope Range(2) (Percent)
Permissible Velocity(1)
Erosion Resistant Soils (feet/sec.)
Easily Eroded Soils (feet/sec.)
Bermudagrass
0-5
5-10
over 10
8
7
6
6
5
4
Bahia
Buffalograss
Kentucky Bluegrass
Smooth Brome
Blue Grama
0-5
5-10
over 10
7
6
5
5
4
3
Grass Mixtures(2)
Reed Canarygrass
0-5
5-10
5
4
4
3
Lespediza Sericea
Weeping Lovegrass(3)
Yellow Bluestem
Redtop
Alfalfa
Red Fescue
0-5
3.4
2.5
Common Lespedeze(4)(5)
Sudangrass(4)
0-5
3.5
2.5
 
      (1)   Use velocities exceeding five feet per second only where good covers and proper maintenance can be obtained.
      (2)   Do not use on slopes steeper than 10% except for vegetated side slopes in combination with a stone, concrete, or highly resistant vegetative center section.
      (3)   Do not use on slopes steeper than 5% except for vegetated side slopes in combination with stone, concrete, or highly resistant vegetative center section.
      (4)   Annuals - use on mild slopes or as temporary protection until permanent covers are established.
      (5)   Use on slopes steeper than 5% is not recommended.
         (a)    From Soil Conservation Service, SCS-TP-61, Handbook of Channel Design for Soil and Water Conservation.
TABLE 8: ROUGHNESS COEFFICIENTS (MANNING'S “n”) FOR SHEET FLOW (a)
   Surface Description   n1
   Smooth surfaces (concrete, asphalt, gravel, or bare soil)   0.011
   Fallow (no residue)   0.05
   Cultivated soils:
   Residue cover 20%   0.06
   Residue cover > 20%    0.17
   Grass:
   Short grass prairie    0.15
   Dense grasses   20.24
   Bermudagrass   0.41
   Range (natural)   0.13
   Woods:3
   Light underbrush   0.40
   Dense underbrush   0.80
VELOCITY EQUATIONS FOR SHALLOW CONCENTRATED FLOW
Paved V = 20.3282 s0.5
Unpaved V = 16.1345 s0.5
(a) From HERPICC Stormwater Drainage Manual - Revised July 1994.
1.The n values are a composite of information compiled by Engman (1986).
2.Includes species such as weeping lovegrass, bluegrass, buffalo grass, blue grama grass and native grass mixtures.
3.When selecting n, consider cover to a height of about 0.1 ft. This is the only part of the plant cover that will obstruct sheet flow.

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