Bhatti Stormwater Plan a
Den,M5 L DckIn50n, 05�P (TEL,) 5 A - bAG7G
Gavin T; Dickin,5on ICKI TAX) 5 W 8' - 5-4974
. 0I"US'
Vropjcois '. tract P.O. Dox 365 Lake, G-,grge. New York. 12545 p"
y .
Storm at r ReporiforKing Hendrick Mate
Town of Queensbury, Warren County, 'e ork
1 May 1
,.evisi,onns:
e
'I"he following rill serve as a Stormwater Management emer t and Pollution Prevention Plan.
Iw
IW ..:
ProLect, Overvie
This project site contains 3,95 ar sof partially developed land in the:Tom f'
Queensbury. The site presently has ( ') single bedroom seasonal cabins, bedreomnn
seasonal cabins, 1) 3 u,uunit motel, 1),office with managers quarters and (1) ,8 unit
apartment building. The ;site also has paved and gravel parking areas to support the
existing structures. A total, existing,irpervio s. area is 36,906 F with a proposed
impervious area of 47, SR The devel praent area is characterized as having;
moderate to shallow shapes, with deep well drained soils. Existing soil type is
characterized as Bice fine sandy learn. These are characteri icd as well.drained with deep
seasonal high ground wvater.
This st rutin ratear report will analyze the catchment areas affected by the proposed new
impervious areas only. This stormwater plan models the proposed dcvelopmImt site
conditions fear ai 101 and 100 year storm exeunt, as required by New Y rlr 'Stateepar .ernt
of Environmental Conservation re, uulatie s shown, in this report and supplemental
calculations, the 10 & 10 year storm runoff velocities will be re-, uuced for post
development nt connditio ns.
Pre and Post development conditions have been modeled using Hydro CAD 1 O.0
Software. Pre Catchmrnernt Areas.A-C Areas -Ccontain 63,940: F of developed and uun velop d
land. Pest Catchment Areas A I-C 1 also zontain 63,940;1; SF of developed and
undeveloped land. A grass swvale and(2), infiltration basins have beemm'paropesed to met p
or exceed predevcicpmernt conditions. A summavy,of the findings are as follows:
;re development 1 year Storm Event Peak Runoff= 1.18 of
Post development 10 Year,Storm Event Peale Runoff=0.09 efs
Pre develanpmemnt 100 year Storm Event Peak Runoff .90 el"s
Post development 10,0 Year iormrn Event Peak Runoff 0,38 efs .
Overview
property development m lead to problems including flooding and erosion. Increases to
impervious areas, such as roads, drives, parking and structures, and changing of land
cover types from forest/forest duffto grassed la ms can result in less, infiltration, a
decrease in the time of concentration of a storm and increase in the volume:and rate of
runoff. With these increases come additional pollutants,and pollutant loadings, such as,
sedirnent, nutrients and increased temperature, all, of which can impact the subject
property and downstream water bodies.,
This stormwater management plan will analyze the runoff frorrn high intensity storms, up
to a 100 year frequency. Control'fing runoff will be accomplished with properly designed
and constructedt�o
srmwa�ter facilities.
This store; water management plan was, generated based on tine following:
Modefing,of the, building site with pre and post development conditions, i.e. slope,
soils type, areas,,, ground coverdrainage, patterns
Determining of the affects of the proposed development on the mudels,
Calculations were.made to detemiine peak flow rates,and,times of concentration
based,upon, this,modefing, using Hydro,CAD v.10.0 l software.
Design.of ponds, conveyances and outfl,ow,s are in accordance:with the "'New York
State: Stor.mwAter Manag,ernent Design Manual",
Temporary Erosion Cgntrpl
Construction silt fencing,details have been included in the plan and details accompanying
this, submission.
Temporary erosion and sedime�nt control includes installation of silt fencing prior to any
construction/clearing, on the downgrade from such activity' along coilltours, upgrade fto;m
any environmentally sensitive areas, such as,, wetlands, and surrounding any soil
stockpiles left overnight or longer, These barriers shall be left inplace and maintained
until the disturbed areas, have been stabilized and ve:get,ation established. When 75% of
final vegetation occurs,, silt fencin,g shall be removed,. All erosion devices and practices,
shall comply with the New Yo�rk State: Guidelines for ' rban Erosion and Sediment
contro'L
Litter will be controlled using on site dumpsters, All storage of chemicals, must be in
construction trailers.
of See cores iruction sped
ficafion,fiortypical erosio,n control devices alrached
herewith.
Er , ion Control Maintence
Weekly inspections of all erosion control devices must be performed, as well as,
inspections after storm events of 1/2" of rain or greater,
Areas that have been re-vegetated must be maintained regularly. Gras,s areas and swales
must be:mowed, on a regular basi,s, and watered, as needed.
Silt fence maintenarice involves,the removal of sediment \)rhen 6 inches deep at the: base
of the fence, the barrier is no longer erector,the toe tail is loose. Repair is necessary to
maintain an, effective barrier.
Temporar".V Stormwater.Manggemen
Temporary storm water management will he accomplished with silt fences, as temporary
surfacewater management,features, Silt fencing Fill be,utilized to control sedimentation,
preventing and/or reducing silt loading in receiving ditches, and to prevent eroded soil
transportation..
Lon Term 5tormwater Yana emeng
Permanent stonnwater,management will be accomplished with the following features and
capacities to accol=odate peak.flows from.a 100 year storm event(See drawings),
Long terms stormwater management will be accomplished using (2) infiltration basins to
collect and treat runoff generated by the proposed development. Both infiltration basi,ns
will have an emergency outlet for overflow conditions,
Lo,L?g Term Storrnwater Maintenance
Long teim maintenance, after,completion ofcanstruction, should include the followffig
* After a 24 hour rainfall event of 0.5 inches or raore or at a minimu m. of once per
month, all erosion and sediment control devices,must be:visually inspected by the
property owner and any necessary repairs,made immediately to maintain the
efficient operation of same.
* Inspect all vegetation for cover and, if necessary,, apply seed and mulch to, obtain
and sustain dense, vigo,ro us vegetative growth.
d
n
o
Conq&vction Phar°L '
L Install Silt fence as, shown.
2. "ill. and ; r° d , as lnwun.
3. Excavate fir utilitiesand building,
. Final grade,, gravel _ seed and,mulch.
. Construct stonnwater controls,
6. Once site is stabilized,,remove temporary erosion controls.
In surnmary, this proposed stormwater management storm will reduce the impacts the
proposed d elo rnncrnt'by controlling and treating stormwat r, in accordance with the
requirements of the stormw at r regulations cited within this report. Storn1water will not
adversely affect adjacent downstream, properties.
De:virn T. Dickinson
o
N
a
4
x
q
0