Checkout of Grassed Waterways

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Checkout of Grassed Waterways

• Beth E. Clarizia, P.E.
• Agricultural Engineer

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Standard Requirements

• Waterways designed to handle a minimum capacity
• Must have a stable outlet
• Flow velocities targeted for a reasonable range,
  but kept below 5 fps
• When design velocity gt3 fps, ECB is required
• Seeding dates 3/1-5/15 or 8/1-9/30

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Checkout Requirements

• Measured constructed length
• Center and low bank shot every 100 feet
• Full cross section every 300 feet

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Design

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

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Cross-sections

• Must show that water drains to the waterway.

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Cross-sections

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

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Survey methods

• Use actual, surveyed cross sections and
  centerline points. Do not interpolate from a
  generated contour.

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Waterway Inlets and Outlets

• Upstream and downstream ends must
• grade out to existing stable ground
• meet a structure
• If rock outlet pad is at downstream end, include
  in waterway checkout

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Alternative designs

• Not eligible

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Seeding

• Indicate whether you have done the seeding or not
  above your signature on the survey notes page
• If installing ECB, fill out ECB installation
  report (you should always be confirming seeding
  if installing ECB)

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Rates

• Grassed Waterway 320 per waterway

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Questions
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