TO BROPHY DRIVE TJ BURR TJ BURR J. ANDREWS J. …...drainage area = 2.8 acres design q(10) = 9 cfs...

DRAINAGE AREA = 2.8 ACRES

DESIGN Q(10) = 9 CFS (POST-FIRE)

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HYDRO-AX TREES,

SEED & MULCH (0.5 ACRE)

MOST LIKELY DRAINAGE ZONE THAT

POSES A THREAT TO THE HOUSE

1.0%

LOG EROSION BARRIERS

(SEE TYP. DETAIL)(160 FT)

SHALLOW GRASS WATERWAY

(SEE TYP. DETAIL)(110 FT)

40'

FILE NAME: Drawings_Johnson_EWP.dwg

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PRINT DATE-TIME: May 16, 2019 - 8:38 AM

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Floodwater or Debris Side

H = ____ IN (40" Min.)

Fill Barrier Bag with an NRCS-approved material

40

Clear & Grub the Surface

TYPICAL FLOOD BARRIER BAG (FBB) - NO BACKFILL

NOT TO SCALE

EXAMPLE FLOOD BARRIER BAG SIZE

15 FT

40"

36"

LF: LINEAR FEET CY: CUBIC YARDS

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DWG REV: 4/24/2019; MG

40"

75

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CONSTRUCTION NOTES: 1. PLACE THE FLOOD BARRIERS AT THE LOCATION AND CONFIGURATION SHOWN ON THE SITE PLAN OR AS DIRECTED BY AN NRCS PLACE THE FLOOD BARRIERS AT THE LOCATION AND CONFIGURATION SHOWN ON THE SITE PLAN OR AS DIRECTED BY AN NRCS REPRESENTATIVE. 2. OBTAIN NRCS APPROVAL OF THE BARRIER PRODUCTS BEFORE PURCHASING THEM. INSTALL MANUFACTURED PRODUCTS TO THE OBTAIN NRCS APPROVAL OF THE BARRIER PRODUCTS BEFORE PURCHASING THEM. INSTALL MANUFACTURED PRODUCTS TO THE MANUFACTURER'S GUIDELINES UNLESS OTHERWISE DIRECTED BY NRCS. 3. CLEAR AND GRUB THE FOUNDATION AREA FOR THE BARRIERS TO A MINIMUM DEPTH OF 4 INCHES BEFORE PLACING THE CLEAR AND GRUB THE FOUNDATION AREA FOR THE BARRIERS TO A MINIMUM DEPTH OF 4 INCHES BEFORE PLACING THE BARRIER. REMOVE ALL ORGANIC MATERIALS WITHIN THE FOOTPRINT OF THE BARRIER. 4. THE BARRIER FABRIC MAY BE PAINTED TO EXTEND THE LIFESPAN OF THE CONTAINER, IF PERMISSIBLE BY THE MANUFACTURER. THE BARRIER FABRIC MAY BE PAINTED TO EXTEND THE LIFESPAN OF THE CONTAINER, IF PERMISSIBLE BY THE MANUFACTURER. 5. IF DEBRIS FLOWS ARE EXPECTED, THE BARRIERS SHALL BE RATED TO RESIST DEBRIS FLOWS, OR SHALL BE ENCLOSED IN IF DEBRIS FLOWS ARE EXPECTED, THE BARRIERS SHALL BE RATED TO RESIST DEBRIS FLOWS, OR SHALL BE ENCLOSED IN WIRE MESH, OR OTHER PROTECTED BY OTHER MATERIALS TO INCREASE ABRASION RESISTANCE. 6. FILL MATERIAL FOR BARRIER BAGS AND BACKFILL SHALL BE FREE OF ROOTS, SOD, AND OTHER ORGANIC MATERIALS; SHARP FILL MATERIAL FOR BARRIER BAGS AND BACKFILL SHALL BE FREE OF ROOTS, SOD, AND OTHER ORGANIC MATERIALS; SHARP OBJECTS INCLUDING LARGE ROCKS; FROZEN SOILS; OR OTHER OBJECTIONABLE MATERIAL. IF A BORROW SITE IS NOT SHOWN ON THE DRAWINGS, THE CONTRACTOR SHALL USE OTHER ON-SITE FILL MATERIAL AS APPROVED BY THE NRCS. COMPACT THE BACKFILL IN 9-INCH LAYERS BY USING TWO PASSES OF THE EARTH MOVING EQUIPMENT. SEED AND MULCH THE SURFACE OF THE BACKFILL ACCORDING TO THE REQUIREMENTS OF THE SPECIFICATIONS OR THE REVEGETATION DRAWING. 7. THE FLOOD BARRIER PRODUCT SHALL BE RATED FOR A LIFESPAN OF AT LEAST __5__ YEARS.THE FLOOD BARRIER PRODUCT SHALL BE RATED FOR A LIFESPAN OF AT LEAST __5__ YEARS.

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SITE-SPECIFIC NOTES: FLOOD BARRIERS SHALL BE SUITABLE TO RESIST DEBRIS FLOW. ____ YES OR ____ NO (CHECK ONE)

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DESIGN QUANTITIES ITEM DESCRIPTION UNITS QUANTITY DESCRIPTION UNITS QUANTITY UNITS QUANTITY QUANTITY 1 FLOOD BARRIER - MIN. HEIGHT LF FLOOD BARRIER - MIN. HEIGHT LF MIN. HEIGHT LF MIN. HEIGHT LF LF 2 BARRIER FILL AND BACKFILL CY BARRIER FILL AND BACKFILL CY CY


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_____ FT

CONTOUR LINE

CONTOUR LINE

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PLAN VIEW

SECTION VIEW AT LOG

TYPICAL LOG EROSION BARRIER (LEB)

NOT TO SCALE

ISOMETRIC VIEW

SIDE VIEW

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WOOD STAKE, POLE, STUMP, OR LOG, 4" MIN. DIA OR EQUIVALENT,

36" MIN. LENGTH, EVERY 10 FT ALONG LEB, 3 MIN. PER LEB.

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8" TO 16" DIA LOG FROM ON-SITE

REMOVE LIMBS

LAND GRADE SPACING (FT)

10 - 20%

21 - 50%

51 - 60%

LEB SPACING

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20% SLOPE SHOWN

PER TABLE

TREE STUMP

20 - 30 FT

EXISTING GROUND

NOT SUITABLE FOR SLOPES > 60%

(EXAMPLE CONFIGURATION)

PLACE FOOT COMPACTED SOIL ON ENDS

CONSTRUCTION NOTES FOR LOG EROSION BARRIERS (LEBs)

1. Log Erosion Barriers are a method of hill slope treatment used to reduce erosion. Provide LEBs at the locations and lengths shown

on the plans and according to the typical detail. For large sites, a per acre density may be specified. LEBs may also be referred to

as Contour Logs.

2. Use on-site, native materials as much as possible. Leave stumps of felled trees to use as supports for LEBs.

3. Install LEBs from uphill to downhill starting with the highest installation first.

4. Verify that logs are level using a hand level, carpenter's level, or other survey instrument.

5. For large sites, the designer may specify an LEB density (60 - 150 per acre typical). If used, the density will be specified below:

Provide LEBs at locations shown on the plans or at a density of ________ LEBs per acre.

LEBs ARE MOST EFFECTIVE WITH THESE SITE CONDITIONS:

· Hillslopes with high- and moderate-burn severity.

· Slopes between 25 - 60%

· When water repellent soils are present

· The soil is highly erodible

· Watersheds with high values at risk

· Where surface runoff is shallow sheet flow.

· Where there are enough standing dead trees to use or a sufficient source of native trees is available.

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Drawing Version 4/24/2019

LEB EXAMPLE PHOTO


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EXISTING GRADE

SPECIFICATION FOR GRASSED WATERWAY (CPS 412)

I. Scope

The work consists of excavating, filling, shaping and seeding, for the construction of the waterway to the cross-section, lines and grades as shown on the

drawings or as staked in the field.

II. Site Preparation

Clear the construction area of obstructions, trees, fences, stumps, roots, brush, rock fragment over 4 inches, boulders, debris, and other unsuitable material. Cut

vertical banks to a 1H:1V or flatter slope placing the fill.

III. Excavation

Excavate the waterway to the cross-section, lines and grades as shown on the drawings or as staked in the field. Strip and stockpile topsoil. After channel

shaping is finished, spread the topsoil over areas that will be vegetated. Use all suitable excavated material in the construction of earthfills. Dispose of extra and

unsuitable materials at locations shown on the drawings or approved by the owner.

IV. EarthFill

Place the earthfill to the cross-section, lines and grades as shown on the drawings or as staked in the field. Use fill material obtained from the required

excavation and designated borrow areas. The fill material shall be free from frozen particles, brush, roots, sod, rock fragments over 4 inches, or other unsuitable

materials. Place earthfill in uniform horizontal layers with a maximum of 9 inches thick (before compaction). The soil used for earthfill shall contain enough

moisture such that when a sample is taken and squeezed in the hand, it will remain intact when released. Compact the earthfill by routing the hauling and

spreading equipment over the fill area so that the entire surface of each layer or lift will be traversed by at least one tread or wheel track of the equipment.

Spread the stockpiled topsoil uniformly over areas that require vegetation. Place for a minimum depth of 3 inches. Finish to a reasonably smooth surface.

V. Vegetation

After the final grading is completed, prepare, fertilize, seed, and mulch the waterway according to Plant Materials Technical Note 59, conservation practice

standard for Critical Area Planting (342), or vegetative requirements as specified on the drawings.

VI. Construction

Minimize disturbance to the site to keep erosion, air pollution, and water pollution to a minimum and within legal limits. Preserve as much of the existing

vegetation as possible, including living trees.

Do not excessively compact areas to-be vegetated by unnecessary travel of construction equipment. Stay within the construction limits. Minimize trampling of

existing vegetation.

The finished channel according to the cross-sections, lines, and grades shown on the drawings. Runoff shall positively flow in the intended direction without

ponding. Farm equipment should be able to easily cross the channel.

Conduct all work and operations according to applicable safety codes, (US Department of Labor, Occupational Safety and Health Administration - OSHA), for the

type of construction being performed with due regards to the safety of all persons and property.

W = _____FT

12

D = ____FT1.5

TYPICAL GRASS WATERWAY

NOT TO SCALE

A = 12.15 SF

RAW EXCAVATION VOLUME = 12.15 x 110 FT = 1,336.5 CU-FT = 50 CY

TO BROPHY DRIVE TJ BURR TJ BURR J. ANDREWS J. …...drainage area = 2.8 acres design q(10) = 9 cfs...

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Transcript of TO BROPHY DRIVE TJ BURR TJ BURR J. ANDREWS J. …...drainage area = 2.8 acres design q(10) = 9 cfs...