§ XIII. Appendix: Tables, figures, and standard forms.

TABLES

Table 1	-	Runoff Coefficients
Table 2	-	Roughness Coefficients
Table 3	-	Return Period
Table 4	-	Rainfall Intensity — Duration
Table 5	-	Circular Pipe
Table 6	-	Entrance Loss Coefficients
Table 7	-	Maximum Permissible Velocities in Erodible Channels Based On Uniform Flow in Continuously Wet, Aged Channels
Table 8	-	Maximum Permissible Velocities In Channels Lined With Uniform Stands of Various Grass Covers, Well Maintained

 

FIGURES

Figure 1 - Overland Flow Time

Figure 2 - Depth of Gutter Flow vs. Discharge, All Streets With 2% Cross Slope

Figure 3 - Depth of Gutter Flow vs. Velocity, All Streets With 2% Cross Slope

Figure 4 - Nomograph For Flow In Triangular Channels

Figure 5 - Capacity and Velocity For Circular Pipe Flowing Full

Figure 6 - Nomograph For Solution of Manning Equation

Figure 7 - Inlet Capacity, Type "A" Standard Curb Inlet Without Deflectors

Figure 8 - Inlet Capacity, Type "A" Standard Curb Inlet With Deflectors

Figure 9 - Theoretical Inlet Capacity, Curb Opening Inlet In Sump Condition at Low Point

Figure 10 - Manhole Losses

Figure 11 - Headwater Depth For Concrete Pipe Culverts With Inlet Control

Figure 12 - Headwater Depth For C.M. Pipe Culverts With Inlet Control

Figure 13 - Headwater Depth For C.M. Pipe-Arch Culverts With Inlet Control

Figure 14 - Headwater Depth For Box Culverts With Inlet Control

Figure 15 - Head For Concrete Pipe Culverts Flowing Full

Figure 16 - Head For Standard C.M. Pipe Culverts Flowing Full

Figure 17 - Head For Standard C.M. Pipe-Arch Culverts Flowing Full, n = 0.024

Figure 18 - Critical Depth: Circular Pipe

Figure 19 - Critical Depth: Pipe-Arch

FORMS:

FORM A	COMPOSITE RUNOFF COEFFICIENTS (BASED ON SURFACE CHARACTERISTICS)
FORM B	COMPOSITE RUNOFF COEFFICIENTS (BASED ON LAND USE)
FORM C	OVERLAND FLOW HYDROLOGY — GUTTER AND INLET HYDRAULICS
FORM D	STORM DRAIN HYDRAULICS
FORM E	CULVERT DESIGN

 

TABLE 6
ENTRANCE LOSS COEFFICIENTS

Coefficient k _e to apply to velocity head V for determination of head loss at entrance to a structure, such as a
2g

culvert or conduit, operating full or partly full with control at the outlet.

Entrance head loss H e	=	k e	V
			2g

 

Type of Structure Design of Entrance	Coefficient k e
Pipe, Concrete
	Projecting from fill, socket end (groove end)		0.2
	Projecting from fill, sq. cut end		0.5
	Headwall or headwall and wingwall
		Socket end of pipe (groove-end)	0.2
		Square-edge	0.5
		Rounded (radius = 1/12D)	0.2
	Mitered to conform to fill slope		0.7
	*End-section conforming to fill slope		0.5
Pipe, or Pipe-Arch, Corrugated Metal
	Projecting from fill (no headwall)		0.9
	Headwall or headwall and wingwalls Square-edge		0.5
	Mitered to conform to fill slope		0.7
		Conforming to fill slope	0.5
Box, Reinforced Concrete
	Headwall parallel to embankment (no wingwalls)
		Square-edged on 3 edges	0.5
		Rounded on 3 edges to radius of 1/12
		Barrel dimension	0.2
	Wingwalls at 30º to 75º to barrel
		Square-edged at crown	0.4
	Crown edge rounded to radius of 1/12
		Barrel dimension	0.2
	Wingwalls at 10º to 25º to barrel
		Squared-edged at crown	0.5
	Wingwalls parallel (extension of sides)
		Squared-edged at crown	0.7

 

*Note: "End-section conforming to fill slope," made of either metal or concrete, are the sections commonly available from manufacturers. From limited hydraulic tests they are equivalent in operation to a headwall in both inlet and outlet control. Some end sections, incorporating a closed taper in their design, have a superior hydraulic performance.