UNDERGROUND OUTLET DESIGN COMPUTATIONS VER. 5-2007

CLIENT: COUNTY: DATE:

DSN BY: CHK BY: ______________ DATE:________

COMMENTS:

~~~~~~~~~~~~~ ~~~ ~~~~~~ ~~~~~~ ~~~~~~ ~~~~~~ ~~~~~~ ~~~ ~~~~~~~~ ~~~~~~~~~

NON-PRESSURE FLOW CONDITION (ROUND CONDUITS)

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INLET DESIGNS INSTRUCTIONS

INLET ID 1 2 3 4 5 ~~~~~~~~~~~~

STATION (Enter applicable

WATER EL ft design values for

GROUND EL ft each inlet to

ORIFICE EL ft determine FLOW)

ORIF DIA OR L in (If grd el = orif

ORIFICE WIDTH in el, assumes no

FLOW cfs riser used)

SURFACE INLET RESTRICTIONS

WI-400(ROUND) cfs (Inlet should have

WI-400(SLOTS) cfs twice the FLOW of

WI-409(HICK.) cfs the orifice)

Hickenbott-8" cfs

Hickenbott-10" cfs

Hick-12"-1" cfs

Hick-12"-1.25" cfs

Hick-12"-1.5" cfs

Hick-12"-2" cfs

MIN GRATE sq ft

GRATE,R1792HGcfs

TILE REACH DESIGNS INSTRUCTIONS

TILE REACH ID 1 2 3 4 5 ~~~~~~~~~~~~

FROM STATION (Enter tile data

TO STATION to make Q,AVAIL

SLOPE % > Q,REQ'D)

TILE DIAMETER in

TILE TYPE No TILE TYPE TABLE

Manning's "n" ~~~~~~~~~~~~~~~~

Q, REQUIRED cfs 1= PVC 4= CLAY

Q, AVAILABLE cfs 2= PE 5= HCMP

3= CMP 6= CONC

IF PRESSURE FLOW, FILL IN WATER ELEVATIONS BELOW

----------------------- ----- ----------- ----------- ----------- ----------- ----

HEADWATER EL ft

TAILWATER EL ft

Q, PRESSURE cfs

VELOCITY fps

HELP SECTION

ABOUT UNDERGROUND OUTLET

This spreadsheet helps you with sizing underground tile lines. It allows you to select up

to 5 inlets and 5 tile reaches, and has sections for both non-pressure and pressurized

flow conditions. It also helps you with selecting an appropriate surface inlet, if one

is needed.

Inputs include: inlet and station IDs (optional), water surface elevation, ground eleva-

tion, orifice elevation, orifice size, type of tile, tile slope, and tile diameter. For

pressure flow conditions you also need to input the design headwater and tailwater eleva-

tions at the inlet and outlet of the tile.

Outputs include: orifice flow rates, surface inlet capacities, Manning's "n" for each

tile reach, and the flow capacity of each tile. For pressure flow conditions the program

provides both the flow rate and velocity in each tile reach.

This spreadsheet is to be used for round conduits only, but it can accommodate both

round and rectangular orifices.

This program was written by Joseph Marter of the Wisconsin Natural Resources Conservation

Service, and was modified by Steve Struss of Wisconsin DATCP.

PROJECT INFORMATION

CLIENT: Enter your client's name here.

DSN BY: Enter your name or initials.

COMMENTS: Enter any pertinent job information.

COUNTY: Enter the county where the project is located.

CHK BY:______ To be filled in manually by the person checking your design.

DATE: The program enters today's date for you.

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

INLET DESIGNS

In this section you enter the following design values for each inlet to determine the flow

into the tile system.

INLET ID: You can leave the 1 through 5 designations provided, or override them with

whatever designation you prefer.

STATION: Enter station numbers here (optional).

WATER EL: Enter the design water surface elevation above the orifice. Any datum will work,

as long as you are consistent throughout your design,

GROUND EL: Enter the ground elevation at the location of the orifice.

ORIFICE EL: Enter the elevation of the orifice center line. If this is the same as the

ground elevation above, the program assumes that there is no riser section.

ORIF DIA OR L: Enter the orifice diameter, in inches, for round openings, or the orifice

length, in inches, for rectangular ones.

ORIFICE WIDTH: Enter the orifice width, in inches, for rectangular openings only. Leave

blank for round openings.

FLOW: The program calculates the design flow rate, in cubic feet per second, based on the

inputs you provided above.

SURFACE INLET RESTRICTIONS

In this section, the spreadsheet provides maximum flow rates, in cubic feet per second,

for 4 different inlets, a WI-400 with round openings, a WI-400 with slotted openings,

a WI-409 Hickenbottom, and a Nenah Foundries R1792HG grate. Also, the minimum square

feet of open area required is provided if you wish to pick a custom grate.

TILE REACH DESIGNS

In this section you enter the following design values for the tile(s) to size each reach:

TILE REACH ID: You can leave the 1 through 5 designations provided, or override them with

whatever designation you prefer.

FROM STATION: Enter the beginning station number from above (optional).

TO STATION: Enter the ending station number from above (optional).

SLOPE: Enter the slope of tile line, in percent (1%=1, not 0.01).

TILE DIAMETER: Pick a likely size, in inches, for your first trial. After you fill in the

remaining values, you will probably need to adjust this to fine-tune your design.

TILE TYPE: Enter a value from 1 to 6 based on the type of tile you want to use, as indi-

cated by the table in Cells I33:J35.

Manning's "n": The program selects this for you based on the type of tile you pick, and in

the case of polyethylene tubing, the size as well.

Q, REQUIRED: Enter the amount of flow which this tile reach must carry based on the flow

data in Row 17. Be careful to take the configuration of the system into account. If tiles

1 and 2 tee together at the entrance to tile 3, you must add the flows of 1 and 2 together

to determine the required flow capacity of 3.

Q, AVAILABLE: The program calculates the maximum flow which the tile can carry under

the design conditions, in cubic feet per second.

If too small of a tile has been selected for any one of the five reaches, an error will

appear in Row 35. Go back and increase the tile diameter, or change slope or tile type

if possible, until the reach has enough capacity.

IF PRESSURE FLOW, FILL IN WATER ELEVATIONS BELOW

This section is only used when the tile outlet is submerged under design conditions.

HEADWATER EL: Enter the water surface elevation above the tile inlet, in feet.

TAILWATER EL: Enter the water surface elevation above the tile outlet, in feet.

Q, PRESSURE: The program calculates the flow, in cubic feet per second, for this reach

under the pressurized condition.

VELOCITY: The program calculates the flow velocity, in feet per second, through each reach.

If you have any questions about this spreadsheet, feel free to call Steve

Struss of Wisconsin DATCP at 608/224-4629. Good luck with your designs!

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