Dingman Township

                                                                                                               Pike County, Pennsylvania

 

Appendices to the Sawkill Watershed Management Ordinance

 

APPENDIX A

 

LIST OF RELATED REGULATIONS, CODES, AND ORDINANCES

 

A.1      Subdivision/Land Development Ordinance No. 13   Enacted April 30, 1970, as amended

A.2      Zoning Ordinance No. 18    Enacted September 3, 1974, as amended

A.3      Floodplain Management Regulations No. 59   Enacted July 1, 1986, as amended

A.4      Road Encroachment Ordinance No. 19   Enacted October 1, 1974, as amended

A.5      Building Code No. 16   Enacted July 2, 1974, as amended

 

 

APPENDIX B.1

 

STANDARD SCS 24-HOUR, TYPE II DISTRIBUTION

CUMULATIVE RAINFALL TABLE

(REVISED MAY 1982)

 

Time Increment = 15 minutes (0.25 hour)

 

 

0.0000 0.0020 0.0050 0.0080 0.0111
0.0140 0.0170 0.0200 0.0230 0.0260
0.0290 0.0320 0.0350 0.0380 0.0410
0.0440 0.0480 0.0520 0.0560 0.0600
0.0640 0.0680 0.0720 0.0760 0.0800
0.0850 0.0900 0.0950 0.1000 0.1050
0.1100 0.1150 0.1200 0.1260 0.1330
0.1400 0.1470 0.1550 0.1630 0.1720
0.1810 0.1910 0.2030 0.2180 0.2360
0.2570 0.2830 0.3870 0.6630 0.7070
0.7350 0.7580 0.7760 0.7910 0.8040
0.8150 0.8250 0.8340 0.8420 0.8490
0.8560 0.8630 0.8690 0.8750 0.8810
0.8870 0.8930 0.8980 0.9030 0.9080
0.9130 0.9180 0.9220 0.9260 0.9300
0.9340 0.9380 0.9420 0.9460 0.9500
0.9530 0.9560 0.9590 0.9620 0.9650
0.9680 0.9710 0.9740 0.9700 0.9800
0.9830 0.9860 0.9890 0.9920 0.9950
0.9980 1.0000 1.0000 1.0000 1.0000

 

APPENDIX B.3

 

STORM INTENSITY-DURATION-FREQUENCY CURVES FOR REGION 4

Intensity by Duration curve for rainfall

 

Stormwater intensity by duration curve

 

RUNOFF COEFFICIENTS FOR THE RATIONAL METHOD

Type of Surface Normal Range

Recommended Value

Pavement:     Concrete or Bituminous Concrete

 0.75 – 0.95 0.90

Pavement: Bituminous Macadam or Surface Treated Gravel 0.65 – 0.80 0.75
Sandy Soil:   Cultivated or Light Growth 0.15 – 0.30 0.20
Sandy Soil:   Cultivated or Light Growth Woods or Heavy Brush  0.14 – 0.30 0.20
Clay Soil:    Bare or Light Growth 0.35 – 0.75 0.50
Clay Soil:   Woods or Heavy Growth 0.25 – 0.60 0.40
Mixed:    Industrial/Commercial 0.70 – 0.95 0.90
Mixed:   Moderate Density Residential 0.50 – 0.70 0.65
Low Density Residential  0.35 – 0.60 0.45
Rural Areas, Parks, Golf Courses  0.15 – 0.30 0.25

 

Appendix B.4

MANNING’S EQUATION

Manning's Equation

 

Appendix B.5

Manning Values Table

 

MANNING “n” VALUES

 

SURFACE                                                                                                                                                 n

 

Uncoated cast-iron pipe

0.013

Coated cast-iron pipe

0.012

Commercial wrought-iron pipe, black

0.013

Commercial wrought-iron pipe, galvanized

0.014

Smooth brass and glass pipe

0.010

Smooth lockbar and welded “OD” pipe

0.011

Riveted and spiral steel pipe

0.015

Vitrified sewer pipe 0.013
Common clay drainage tile 0.012
Glazed brickwork 0.013
Brick in center mortar; brick sewers 0.015
Neat cement surfaces 0.011
Cement mortar surfaces 0.013
Concrete pipe 0.012
Concrete pipe 0.012
Wood stove pipe 0.011
Plank flumes: Planed 0.012
Plank flumes: Unplaned 0.013
Plank flumes: With battens 0.015
Concrete-lined channels 0.014
Cement-rubble surface  0.020
Dry-rubble surface 0.030
Dressed-ashlar surface 0.014
Semi-circular metal flumes, smooth 0.012
Semi-circular metal flumes, corrugated 0.025
Canals and ditches: Earth, straight and uniform 0.025
Canals and ditches: Rock cuts, smooth and uniform 0.033
Canals and ditches: Rock cuts, jagged and irregular 0.040
Canals and ditches: Winding sluggish canals 0.025
Canals and ditches: Dredged earth channels 0.0275
Canals and ditches: Canals with rough stony beds, weeds on earth banks 0.035
Canals and ditches: Earth bottom, rubble sides 0.030
Natural stream channels: (1) Clean, straight bank, full stage, no rifts or deep pools 0.029
Natural stream channels: (2) Same as (1), but some weeds and stones 0.035
Natural stream channels: (3) Winding, some pools and shoals, clean 0.039
Natural stream channels: (4) Same as (3), lower stages, more ineffective slope and sections  0.047
Natural stream channels: (5) Same as (3), some weeds and stones 0.042
Natural stream channels: (6) Same as (4), stony sections 0.052
Natural stream channels: (7) Sluggish river reaches, rather weedy\or with very deep pools 0.065
Natural stream channels: (8) Very weedy reaches 0.112

For additional “n” values, refer to Table

 

Click Here for Link to Appendix C A