Construction plans for subdivisions, site development
and public improvements must include steps needed to prevent and mitigate
urban erosion and urban sedimentation. The developer shall submit
plans and/or a report, prior to construction, which indicate the mitigating
and controlling measures appropriate to the site. The Highway Superintendent
and Town Engineer shall review this plan. The Highway Superintendent
or Town Engineer shall have the authority to require that the approved
plan shall be implemented.
A.
Vegetative control measures include:
(1)
The planting of grasses, legumes, trees and
shrubs. The developer shall select species that are adapted to the
site and purpose of planting. A planting guide should be consulted
which lists the most common and important area species of grasses,
woody plants and legumes that may be used for controlling erosion
and sediment.
(2)
Topsoiling and slope stabilization (mulched
anchoring) for establishment of the grasses and legumes; grassing
waterways and outlets; ditch and channel bank seedings, jute and sod.
The developer shall apply needed ground cover on exposed soils within
15 to 30 days of exposure, except on areas where final construction
will begin within 30 days. The developer shall stockpile topsoil to
apply on sites as required for establishing vegetation.
(3)
Protection of trees against damage from construction
grading and landfilling.
B.
Burning of vegetative cover will not be allowed, unless
by county permit.
A.
Land grading shall be in accordance with the approved
plan. The plan shall limit the grades of slopes so that plants may
be easily established.
B.
Suitable side slopes which are not greater than two
to one shall be maintained for slope stability.
C.
Benches, berms, terraces or ledges, temporary and
permanent, shall be constructed as necessary across sloping land to
reduce the length and grade of a steep slope.
D.
Diversion ditches or channels and ridges shall be
constructed to intercept surface runoff as necessary.
E.
Grassed waterways or outlet swales shall be constructed
to maintain nonerosive velocities as required.
F.
Siltation, debris or sediment basins shall be constructed
to trap runoff waters during construction, prior to entering a stream,
creek, pond, lake, swamp or other environmentally sensitive or protected
body of water.
G.
Grade stabilization structures shall be constructed
from earth, pipe, concrete, masonry, steel, aluminum, wood or sod.
These structures shall be used as required to safely convey water,
reduce grades, stabilize downcutting or change the direction of flow
of water.
H.
Any detention structure, retention structure or impoundment
pond shall be constructed to store runoff waters and release same
at a rate which will prevent flooding and erosion. The pond may have
earthen dams, spillways, pipe outlet structures, overflow weirs or
ditches to control the outflow.
I.
Gabions and mattresses (compartmented rectangular
containers made of heavy galvanized steel wire woven in twist patterns
and filled with stone), may be used to support vegetation growth,
to mitigate erosion and ice flows, as revetments for embankment protection,
as weirs in basin designs or channel lining in ditches.
J.
Temporary silt fences and staked hay (straw) bale
berms shall be used to contain sediment on site and allow the passage
of runoff waters.
K.
Finished culvert end sections shall be installed on
all pipe ends to prevent scouring and undercutting. Rip-rap shall
be placed beyond the end section on both the sides and bottom slopes
of the drainageway.
L.
Protective slope materials shall be utilized and they
include straw or hay anchored in place with asphalt emulsion, stapled-down
jute or polypropylene mesh, wood chips and continuous filament fiberglass.
M.
Temporary erosion and siltation control measures shall
conform to the requirements of the United States Department of Transportation,
Federal Highway Administrative Guidelines, New York State Guidelines
for Urban Erosion and Sediment Control, or Dutchess County SCS Soil
Erosion and Sediment Control Guidebook.
