to brophy drive tj burr tj burr j. andrews j. …...drainage area = 2.8 acres design q(10) = 9 cfs...
TRANSCRIPT
DRAINAGE AREA = 2.8 ACRES
DESIGN Q(10) = 9 CFS (POST-FIRE)
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9 CFS
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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'
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Feet
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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
X
DWG REV: 4/24/2019; MG
40"
75
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_____ FT
CONTOUR LINE
CONTOUR LINE
25
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PLAN VIEW
SECTION VIEW AT LOG
TYPICAL LOG EROSION BARRIER (LEB)
NOT TO SCALE
ISOMETRIC VIEW
SIDE VIEW
3
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1
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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
50
25
15
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.
90
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