Checkout of Grassed Checkout of Grassed Waterways Waterways

Beth E. Clarizia, P.E.Beth E. Clarizia, P.E.

Agricultural EngineerAgricultural Engineer

Standard RequirementsStandard Requirements

►Waterways designed to handle a Waterways designed to handle a minimum capacityminimum capacity

►Must have a stable outletMust have a stable outlet►Flow velocities targeted for a Flow velocities targeted for a

reasonable range, but kept below 5 fpsreasonable range, but kept below 5 fps►When design velocity >3 fps, ECB is When design velocity >3 fps, ECB is

requiredrequired►Seeding dates: 3/1-5/15 or 8/1-9/30Seeding dates: 3/1-5/15 or 8/1-9/30

Checkout RequirementsCheckout Requirements

►Measured constructed length Measured constructed length ►Center and low bank shot every 100 Center and low bank shot every 100

feetfeet►Full cross section every 300 feetFull cross section every 300 feet

DesignDesign

• The whole design storm must fit inside the The whole design storm must fit inside the designed flow section, and the velocity designed flow section, and the velocity when this design section flows full cannot when this design section flows full cannot exceed 5 fps. exceed 5 fps.

Cross-sectionsCross-sections

Must show that water drains to the Must show that water drains to the waterway. waterway.

Cross-sectionsCross-sections

Can assume a tenth or two of depth of fill Can assume a tenth or two of depth of fill along the sides, but be careful. along the sides, but be careful.

Landowner:County: Waterway No.:

Station BS HI FS ELEV

TBM Offset RR Elev Offset RR Elev Offset RR Elev RR Elev Offset RR Elev Offset RR Elev Offset RR Elev

Contractor: Date:

Signature:

(print name)

Trapezoidal Waterway Checkout

I certify that this grassed wateray has been installed in compliance with the construction plans and specifications.

I certify that this grassed waterway (has) (has not) been seeded according to NRCS specifications.

Right Top EdgeRight Bottom Plus 20 FeetLeft Top Edge Left Bottom CenterlinePlus 20 Feet

Landowner:County: Waterway No.:

Station BS HI FS ELEV

TBM Offset RR Elev Offset RR Elev Offset RR Elev RR Elev Offset RR Elev Offset RR Elev Offset RR Elev

Contractor: Date:

Plus 20 Feet

Signature:

(print name)

Parabolic Waterway Checkout

I certify that this grassed wateray has been installed in compliance with the construction plans and specifications.

I certify that this grassed waterway (has) (has not) been seeded according to NRCS specifications.

Right Top Edge1/4 Point Plus 20 FeetLeft Top Edge 1/4 Point Centerline

Survey methodsSurvey methods• Use actual, surveyed cross sections and Use actual, surveyed cross sections and

centerline points. Do not interpolate from a centerline points. Do not interpolate from a generated contour.generated contour.

Waterway Inlets and OutletsWaterway Inlets and Outlets

Upstream and downstream ends must:Upstream and downstream ends must: grade out to existing stable ground grade out to existing stable ground meet a structuremeet a structure

If rock outlet pad is at downstream If rock outlet pad is at downstream end, include in waterway checkout end, include in waterway checkout

Alternative Alternative designsdesigns

►Not eligibleNot eligible

Landuser: Designed by: Date:County: Title:

Checked by: Date:Tract No. Field - Title:Location: Section T R

Practice ID:

Req'd. Ft. wide 4 5 6

BW, ft. Z 25 30 40 4 5 6

X Sect Type Depth Ft.

Length Ft.

Outlet Pipe

ALTERNATIVE WATERWAY DESIGNVersion 1.5 4/05

Seeding Width-ft.

Design Grade, %

Design TW - Ft.

WW ID

Design Trap. Sect.

WW ID

D.A. Acres

Tile Size, in. - LengthsEros Contrl Blanket

Outlet Pipes, Size & NumberMulching Acres

WW ID

WW Length for Topwidths WW ID

Seeding Acres

ECB Sq. Yd.

Figure 1. Alternative Waterway Design

0.0

10.0

20.0

30.0

40.0

50.0

60.0

1 2 3 4 5 6 7 8 9 10Waterway Grade - Percent

Dra

inag

e A

rea

- A

cres

TW=40 ft, D=1.2 ft.

TW=30 ft, D=1.0 ft

TW=25 ft, D=0.8 ft.

Reference: EFH Chap 7, IN-Supplement

SeedingSeeding

Indicate whether you have done the Indicate whether you have done the seeding or not above your signature seeding or not above your signature on the survey notes pageon the survey notes page

If installing ECB, fill out ECB If installing ECB, fill out ECB installation report (you should always installation report (you should always be confirming seeding if installing ECB)be confirming seeding if installing ECB)

RatesRates

►Grassed Waterway = $320 per Grassed Waterway = $320 per waterway waterway

QuestionsQuestions

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