DRAIN DIAPHRAGM DESIGN Ver. 6-2012

CLIENT: COUNTY:

DSN BY: DATE: CHK BY: DATE:

COMMENTS:

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INPUT

Upstream side slopes Hood inlet (1), Pipe drop (2)

Top of Dam elev. Riser inlet elev.

Top Width (ft.) Conduit invert elev at inlet

Downstream side slopes Riser distance from upstream toe (ft.)

Downstream toe elev. Conduit diameter (in.)

Max water surface elev. Pipe outlet elev.

Centerline of Dam to US edge of Diaphragm (ft.) Pipe extension past toe (ft.)

Thickness of Diaphragm (ft.)

Horz. And Vert. Diaphragm size (2D or 3D) 3 Diaphragm extension below conduit (ft.)

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OUTPUT

Pipe Length (ft.) 0.00 DIAPHRAGM SIZE

Pipe Slope #DIV/0! Width (ft.) 0

Elev. pipe-embankment intercept #DIV/0! Height (ft.) 0

Thickness (ft.)

Volume (cu. yds.) 0.0

Meets H/2 requirement #DIV/0!

Meets 2' cover requirement #DIV/0! Drain Outlet

L #DIV/0!

W 4

H 0.5

Conduit Area / 2 0.00

Clear Cells

Print Page

cross section

Page 2

Dia

phra

gm

US

Riser Riser

Dia

phra

m D

S

H/2 H/2 2 ft cover 2 ft cover 0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0 20

Ele

va

tio

n

Station

Embankment Cross section

Embankment Pipe Conduit invert Diaphragm US Riser Pipe Conduit top Diaphram DS H/2 1 ft cover

LANDOWNER: 0

COMMENTS: 0

Upstream side slopes 0 Hood inlet (1), Pipe drop (2) 0

Top of Dam elev. 0 Riser inlet elev. 0

Top Width (ft.) 0 Conduit invert elev at inlet 0

Downstream side slopes 0 Riser distance from upstream toe (ft.) 0

Downstream toe elev. 0 Conduit diameter (in.) 0

Max water surface elev. 0 Pipe outlet elev. 0

Centerline of Dam to US edge of Diaphragm (ft.) 0 Pipe extension past toe (ft.) 0

Thickness of Diaphragm (ft.) 0

Horz. And Vert. Diaphragm size (2D or 3D) 3 Diaphragm extension below conduit (ft.) 0

Summary of Dimension

w= 0.00 Feet Total Width of Drain Diaphragm

T= 0.00 Feet Total Height of Drain Diaphragm

t= 0.00 Feet Thickness of Single Filter

4.00 Feet Outlet filter width

Summary of Design

#DIV/0! Feet Top Elevation of Diaphragm

#DIV/0! Feet Bottom Elevation of Diaphragm

Profile Along Center Line of Conduit0.00 Pipe Outlet Elevation

S= #DIV/0! Slope of the Conduit in Feet of Fall per Horizontal Foot

Z= 0 Downstream Side Slope

Section of Riprap (perpendicular to slope)

w (min )= 6.00 feet

thick (ft) = 1.8 feet

Estimated Quantities

Drain Filter Material #DIV/0! cubic yards

Geotextile #DIV/0! square yards

Riprap #DIV/0! cubic yards

Date File Name

Designed 0 1/0/1900

COOPERATOR 0 Drawn Drawing Name

Checked

COUNTY 0 ApprovedSheet ___ of ___

DRAIN DIAPHRAGM DESIGN

Input Data

DRAIN DIAPHRAGM DESIGN

Natural Resources Conservation Service United States Department of Agriculture

This spreadsheet calculates the size (width & height) of the diaphragm, along with the

placement of the diaphragm on the pipe (distance from centerline).

Inputs

Upstream side slopes, Top of Dam elev., Top Width (ft.), Downstream side slopes,

Downstream toe elev., Max water surface elev., Centerline of dam to upstream edge of

diaphragm, horizontal and vertical diaphragm size.

Hood Inlet: Permanent pool elev., Hood Inlet elev.

Pipe Drop: Riser inlet elev., Conduit invert elev. at inlet.

Hood Inlet and Pipe Drop:

Riser distance from upstream toe (ft.), Conduit diameter (in.), Pipe outlet elev.,

Pipe extension past toe (ft.), Thickness of diaphragm, diaphragm extension below conduit

Outputs

Pipe length, Pipe slope, Elevation pipe-embankment intercept, Elevation of top of Diaphragm,

Elevation of bottom of Diaphragm, Total Height of Drain Diaphragm, Total Width of

Drain Diaphragm, Thickness of Single Filter, Section of Riprap, Estimated Quantities.

This spreadsheet was developed by Bob Henrich of the Natural Resources Conservation Service

and was modified December 2006 by Scott Mueller. Modified June 2009 for printing formatting.

Modified June 2012 to change geotextile output units from SF to SY.

Landowner: Enter your client's name here.

DSN BY: Enter your name or initials.

Comments: Enter pertinent job information, including what type of practice you are designing.

CHK BY:______ Filled in manually by the person checking your design.

Date: ______ To be typed when drain diaphragm is designed.

Date:______ To be filled in manually when your design is checked.

HELP SECTION

PROJECT INFORMATION

Upstream side slopes: Side slope ratio, horizontal to vertical, of the upstream embankment.

Top of Dam elev.: The neat lines and grades elevation of the embankment top after

compaction and settling, in feet.

Top Width (ft.): Top width of the embankment, in feet.

Downstream side slopes: Side slope ratio, horizontal to vertical, of the downstream

embankment.

Downstream toe elev.: The neat lines and grades elevation of the downstream toe after

compaction and settling, in feet.

Max water surface elev.: Maximum potential reservoir water level.

Centerline of dam to upstream edge of diaphragm (ft): Distance in feet from the

centerline of the dam to the upstream edge of the diaphragm. Diaphragm should be

located immediately downstream of the cutoff trench unless the cutoff is upstream of the

centerline then the diaphragm should be downstream of the centerline of the dam.

Horizontal and vertical diaphragm size: Diaphragm should extend vertically upward and

horizontally 3 times the outside pipe diameter. Locked per 378 standard

Hood inlet or Pipe drop: Select the type of inlet that will be used.

Perm. pool elev: (Hood Inlet) Elevation of the permanent pool.

Hood Inlet elev.: (Hood Inlet) Elevation at the hood inlet.

Riser inlet elev.: (Pipe Drop): Elevation at the riser inlet.

Conduit invert elev at inlet: (Pipe Drop) Elevation of the conduit invert at the inlet.

Riser distance from upstream toe (ft.): Distance, in feet, from the inlet to the upstream toe.

Conduit diameter (in.): Dimension, in inches, of the conduit.

Pipe outlet elev.: Elevation of the invert at the pipe outlet.

Pipe extension past toe (ft.): Distance, in feet, the conduit extends past the toe of the dam.

DATA INPUT SECTION

Thickness of diaphragm (ft): The diaphragm should be a minimum of 2 feet thick.

Diaphragm extension below conduit (ft): The diaphragm should extend a minimum of

18 inches below the conduit invert.

Both Cells C27 and C29 need to say "OK" for the design to meet the design criteria

Pipe Length: Total length of conduit in feet.

Pipe Slope: Slope of the conduit in feet of fall per horizontal foot.

Elev. pipe-embankment intercept: Elevation at the point where the pipe intersects the

embankment near the outlet area.

Elevation of top of Diaphragm: Elevation at the top of the diaphragm.

Elevation of bottom of Diaphragm: Elevation at the bottom of the diaphragm.

Total Height of Drain Diaphragm (T): Top elevation-bottom elevation + diameter of the conduit.

(Y + R + D)

Total Width of Drain Diaphragm (w): Width in feet of the diaphragm.

Thickness of Single Filter (t): Thickness in feet of a single filter which extends from the

downstream side of the drain diaphragm, under the conduit to the toe of the embankment.

Minimum thickness is 2'.

Section of Riprap: Minimum width (w) and thickness, in feet, of riprap perpendicular to slope.

for the outlet of the drain diaphragm system.

Estimated Quantities: Estimated amount of materials needed to complete the project as designed

including the amount of drain filter material in cubic yards, amount of geotextile in square feet, and

amount of riprap in cubic yards.

1. On the Format menu, click Selected Axis. (first left click on the Y axis)

OUTPUT SECTION

Plotting cross section tab

Note  The Selected Axis command is only available when a chart axis is selected.

1a. (or Right click on the Y axis)

2. On the Scale tab change the number at which the value axis starts or ends

type a different number in the Minimum box or the Maximum box.

If you have questions about this spreadsheet feel free to contact Scott Mueller

at NRCS State office 608-662-4422 x 265. OR any area engineering staff

"A nation who destroys its soil, destroys itself." FDR

Pipe length, Pipe slope, Elevation pipe-embankment intercept, Elevation of top of Diaphragm,

Comments: Enter pertinent job information, including what type of practice you are designing.