For all subdivisions, Town of Austerlitz Code requirements (e.g., Chapter
101, Flood Damage Prevention) related to stormwater management shall be met.
A. Surface water. The applicant may be required by the Planning Board
to carry away by pipe or open channel any surface water that may exist
either previous to, or as a result of, the subdivision. Such drainage
facilities shall be located in the road right-of-way where feasible,
or in perpetual unobstructed easements of appropriate width.
B. Drainage structure to accommodate potential development upstream.
A culvert or other drainage facility shall, in each case, be large
enough to accommodate potential runoff from its entire upstream drainage
area, whether inside or outside the subdivision. The Town Engineer
shall approve the design and size of the facility based on the anticipated
runoff under conditions of total potential development permitted by
the Zoning Law in the watershed.
C. Responsibility for drainage downstream. The applicant's engineer
shall also study the effect of each subdivision on the existing downstream
drainage facilities outside the area of the subdivision. This study
shall be reviewed by the Town Engineer. If it is anticipated that
the additional runoff incident to the development of the subdivision
will overload an existing downstream drainage facility during a ten-year
storm, the Planning Board shall notify the Town Highway Superintendent
of such potential condition. In such case, the Planning Board shall
require alternative drainage measures, if any, until provision has
been made for the improvement of said condition off site.
D. Stormwater management design.
(1)
Design of the stormwater management system shall be consistent
with general and specific concerns, values, and standards of the Town
Comprehensive Plan and Code, and applicable county, regional, and
state storm drainage control programs, if applicable. Design shall
be based on environmentally sound site planning and engineering techniques
and shall be designed to result in stormwater runoff rates after development
equal to the runoff rates prior to development.
(2)
The appropriate technology shall be used to minimize off-site
stormwater runoff, increase on-site filtration, encourage natural
filtration functions, simulate natural drainage systems, and eliminate
off-site discharge of pollutants to ground- and surface water. Such
technology may include measures such as retention basins, recharge
trenches, porous paving and piping, contour terraces, and swales.
(3)
Easements within the subdivision or project site to the ultimate
point of stream discharge shall be furnished.
(4)
The pattern of drainage shall be included in the grading plans
if such plans are required by the Planning Board. This plan shall
clearly indicate the direction of flow of all surface water, the location,
size, and type of drainage structures, and notation as to the final
point of discharge of the surface water. The applicant shall make
suitable entrances to private driveways, and driveway culverts shall
be installed as approved by the Planning Board.
(5)
The Planning Board reserves the right to require special provisions
in any case where, in the opinion of the Planning Board, runoff cannot
be adequately handled by the drainage structures shown on the typical
sections.
(6)
All subdivisions shall be laid out to be compatible with the
drainage pattern affecting the areas involved, with proper provision
to be made for adequate storm drainage facilities. Storm drainage
plans shall reflect potential surface runoff within the drainage area
after development.
(7)
Right-of-way for storm drainage must be sufficient for facilities
to handle not only the anticipated discharge from the property being
subdivided but also the anticipated runoff that will occur when property
at a higher elevation in the drainage basin is developed.
(8)
Whenever possible, lots shall be graded so that drainage from
the lot flows to a road, municipally owned drainage facility, or natural
watercourse, without crossing other lots.
E. Land subject to flooding/compliance with Flood Damage Prevention
Law.
(1)
In addition, and for all other designated floodplain areas, pursuant to the Town's Flood Damage Prevention Law (Town Code Chapter
101), a floodplain development permit may be required if the proposed subdivision is located in areas of special flood hazard as defined in said Flood Damage Prevention Law. If such is the case, the Planning Board and the applicant shall consult with the Town's Code Enforcement Officer for consideration of, and compliance with, the Flood Damage Prevention Law. The applicant may be required to provide base flood elevation data if such data is not available from other sources. The Planning Board shall consult with the Code Enforcement Officer for purposes of reviewing a proposed subdivision, in order to determine whether proposed building sites will be reasonably safe from flooding. If a proposed building site is located in an area of special flood hazard, all new construction and substantial improvements shall meet the applicable standards as set forth in the Flood Damage Prevention Law.
(2)
Land subject to flooding by a 100-year frequency storm or less,
or land deemed by the Planning Board to be uninhabitable, shall not
be subdivided for residential occupancy, nor for such other uses as
may increase danger to health, life or property, or aggravate the
flood hazard, but such land within the subdivision shall be set aside
for such uses as shall not be endangered by periodic or occasional
inundation or improved in a manner satisfactory to the Planning Board
to remedy such hazardous conditions.
F. Wetlands. If any wetlands of any kind or size lie within the boundaries
of the proposed subdivision or within 100 feet of the proposed subdivision,
the applicant shall comply with the requirements of the New York State
Freshwater Wetlands Act and the Army Corps of Engineers, if applicable. The final
plats shall indicate such compliance prior to approval by the Planning
Board.