HomeMy WebLinkAboutWPO200500052 Plan - Stormwater Stormwater Management Plan 2005-08-22........... ________--~_-~~_.-
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Willow Bend Basin — Wetland Conversion
Sequence of Construction
1. Cut slits in the dewatering snout in order to drdewater
ert
of the dewatering orifice (85.5). Let the bnslow
lythrough the
slits. Let the basin dry out for an adequate period of time to allow for further
the water to elevation 85 may also be needed to
construction. Pumping out " holes OR 4
establish a suitable working environment. (Reinstall snout with Y
install trash rack an erosion control orifice).
tic formulation of glyphosate (Trade
2. Treat the existing cattails with an aqua vailable). Mix appo°IoPtion (2
name is Rodeo, but generic formulations areaTbs herbicide per gallon of water) and applywitha wick tpe
(available from ag supply stores) OR put on a latex glove, then a cotton glove,
dip the glove(s) into the solution. and wipe the cattails. This is a more precise
method that delivers a lethal dose. Do not use a sprayer, as the spray kills
everything it hits.
3. After the basin bottom is sufficiently dry, install 16" Coir Logs as per
manufacturer's specifications. Logs should be installed at the bottom of the
safety ledge/aquatic bench at elevation 85, as shown on the plan. Each 20'
log should have 10 stakes (7 on the downslope side, and 3 on the upsloPe
side, as shown on detail). The logs should be at least half -submerged in
water.
4. Place silt fence at the bottom of the downhill slope of the dam.
5. Excavate material from the top of the dam so that the top is at elevation 89.
Place the material along the inside toe of the dam to form a safety
ledge/aquatic bench extending out to the installed Coir Logs. The fill for the
bench should run from elevation 85.6 against the dam to elevation 84.6 up
against the log. The fill should not e cdaomm to the rise�struct�re ineorder to allow
Also, install some material from th
easier maintenance access.
6. place 0.4' of topsoil along the aquatic bench so that the elevation of the
bench is 86 against the dam and 85 up against the logs. Mix the topsoil into
the upper layer of fill and lightly tamp so that the soil stays in place. This will
7. Repair all erosion rills and gullies around the perimeter of the basin. iulching, and, in some cases, redirecting
entail filling with soil, seeding, and n
flow through a channel to one of the basin inlets.
8. Install plants in the Coir Logs, along the aquatic bench (Hi -Marsh zone), in the
Low -Marsh zone, and around the perimeter of the basin as shown on the
landscape plan. Ali aquatic plants must be kept moist and out of direct
sunlight until installation. Plants should be insplareitedsngan
lpbThe dense shrub pond edge plants shoudbe oversized planting
hole if planted in compacted soil. If Canada Geese are in the area, all
emergent planting zones must be protected with adequate goose protection
(e.g., netting, web of string, etc.).
9. Seed and mulch all disturbed areas.
10. Paint the riser structure dark green with a paint suitable for concrete.
Coir Log Installation Guide ate number of stakes must be used to insure that the logs ;are not
Proper staking is critical for a successful installation. An adequate
dislodged from the shoreline. On very low energy sites, such as small ponds, as few as 7 stakes per log can be used (Fig.11A). The
shakos should bo p16-ood on -the water side of the log and inserted through the netting (Fig. 2), On medium energy sites, at least 10
Fig. I B). If there is any chance that the log could be moved by fast water or lifted by ice in the winter,
Makes slijould be U50d per log lite todiniCil.10 sjIoW(I III f,ig,3. ()II I)igl) ollOrgy,lite.yi, �,Lldl ftl_ti lmq)o 11*05 oir fmt rvioving
j()gs rt)oilIr1 i)a cindiod to 1110 j)Ojt0(1I Win -IG. Oil bayslioros Or IAOS'Wlill . . I fold I of ovdi''i /2 0 lild, A
bodies of water, a minimum of 17 stakes should be used as shown in Fig.
minimum of 20 stakes should be used on each log.
The logs should be placed so that about 1/2 of the log is submerged. Normally, the plants are installed in a "zig-zag" paIttern into the top
of the log (Fig. 4). Try to install the plants an inch or so deeper into the log than the depth of the plant plug. It is very important that the
plants have an adequate amount of moisture wicking up through the coir fiber to their root systems. When the logs are installed in low
water conditions, it is acceptable to install the plants into the side of the log. Under no circumstances should plants be installed into logs
that are not at least partially in the water unless the plants can be irrigated.
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Willinw Bend Basin — Landscape Plan
Container numbers refer to plant sizes as per ameaeds
Wrsery &SLIPPIY CalalO%eContainrt#tttLtrtIt���g�il�ty trttrrt
diameter, Container#7 deep x 13.5" dr 09191 plants may Cal
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with the designer and County.
I-IPE o(_17'LE7 CONDITIONS
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PIPE OUTLET TO FLAT
AREA WITH NO DFIFTNED
CHANNEL
L a 0 7:
4maz�jffu o d
SECTION A --A
A T
3(in (MIN)
do
71PE OUTLFT TO KEIL
-r- X DEF],XED CHMINEL
PLAN VIEW
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SECTION A -A
jtHCOXV(,.rfprr) rnR F.jjTMr rFFTVrrV.R
NOTES L APRON WON" S(A-f BE PUPRAP, CROUTtO ftIPRAP, GABION
BASKET, OR CONCRE7F
2 to LS THE 1Y.N(GTH OF THE RIPRAP APRON 11 fA1ZU1ATF0
USING PLAT ES 3.18-3 AND 318-4.
1.6 TIMES Tfir MA);MUM 5-WNc ulAmLr4R, BUT POT
— THAN JNCHE!
Source: Va, DSWC Plate 1AR-1
PROJECT NO, 0
SCALE:
DATE: 06 02. -LOOS
DRAWN BY:DT14
CHECKED BY:
REVISIONS
Date /Description:
(C)cqht Date:—
B4k+bts, Inc. This document
may not be L-*d wrewoduoed fcr
the I:Xfor
written Coclsent at chkilats, Inc.
SHEET: 2—
LAVDSCAPE PLAN
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ilOhanit2ttS
of Virginia, Inc
P.O. Box 29540
P.O. Box 7'
Richmond,
Charlottesville
Virginia 23229
Virginia 2_2902
434-2,15-0011
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