A.
For any proposed development not exempt under Article III, § 192-9, of this chapter, a phased stormwater management plan shall be submitted to the approving authority for review and approval. Unless otherwise determined by the approving authority, plans shall be submitted for the concept, site design, and final stormwater management construction. When deemed appropriate by the approving authority due to minor cumulative impacts of the development and when the applicant has demonstrated that ESD standards have been met to the MEP, the site design and final stormwater management construction phases may be combined. Site plans, subdivisions, and building permits with a total proposed impervious lot coverage of 15% or less and total land disturbance less than 20,000 square feet may combine all review phases when the applicant has demonstrated that ESD standards have been met to the MEP using the Standard Plan. Site plans and building permits that meet the criteria outlined on the Kent County Standard Stormwater Plan may utilize the Standard Stormwater Management Plan.
B.
Conceptual stormwater management plans should be submitted with preliminary sketch site or subdivision plans and shall include sufficient information for an initial assessment of the proposed project and proposed stormwater. The concept review process will review at a conceptual level, the feasibility, design and environmental characteristics of the proposal with a goal to ensure that significant natural areas are protected and to determine if stormwater management can be provided according the Stormwater Management Measures identified in Article V, § 192-13, of this chapter.
C.
Following conceptual approval and where applicable in conjunction
with the preliminary site or subdivision plan, the applicant shall
submit a site development plan. The site development plan shall include
detailed designs for stormwater management and erosion and sediment
control. The site development plan process will review the plan to
ensure that all options for implementing ESD have been exhausted and
comments received during conceptual review have been incorporated
into the site development plan.
D.
Following site development plan approval and where applicable in
conjunction with the final site or subdivision plan and the sediment
and erosion control plan, the applicant shall submit a final stormwater
management plan. The final stormwater management plan shall include
stormwater construction drawings accompanied by a report that includes
sufficient information to evaluate the effectiveness of the proposed
runoff control design. The final stormwater plan process will review
the plan and supporting documents for compliance with all applicable
regulations and to ensure that, when structural practices are used,
all reasonable options for implementing ESD have been exhausted.
E.
The approving authority shall perform a comprehensive review of the
stormwater management plans for each phase of the site design. Coordinated
comments will be provided for each plan phase that reflects input
from all appropriate agencies including but not limited to the Kent
Soil and Water Conservation District, the Rock Hall Planning and Zoning
Board and the Rock Hall Utility Commission. All comments shall be
addressed and reflected in the next phase of project design.
F.
The stormwater management plan shall not be considered approved without
the inclusion of the signature and date of the signature of the approving
authority on the plan.
A.
Concept plan. A concept stormwater management plan shall include:
(1)
Scale of one inch equals 100 feet or greater detail;
(2)
Vicinity map with site location clearly marked;
(3)
North arrow;
(4)
Existing natural features, water and other sensitive resources;
(5)
Topography;
(6)
Natural drainage patterns;
(7)
Anticipated location of all proposed impervious areas, buildings,
roadways, parking, sidewalks, utilities, and other site improvements;
(8)
Location of the proposed limit of disturbance, erodible soils, steep
slopes, and areas to be protected during construction;
(9)
Preliminary estimates of stormwater management requirements, the
selection and location of ESD practices to be used, and the location
of all points of discharge from the site;
(10)
A narrative that supports the concept design and describes how
ESD will be implemented to the MEP; and
(11)
Any other information required by the approving authority that
is consistent with the preliminary nature of concept plan review.
B.
Site development plan. A site development plan shall include:
(1)
Scale of one inch equals 100 feet or greater detail;
(2)
Vicinity map with site location clearly marked;
(3)
North arrow;
(4)
All the information provided in the concept stormwater management
plan;
(5)
Final layout;
(6)
Exact impervious area locations and acreages;
(7)
Proposed topography;
(8)
Delineated drainage areas at all points of discharge from the site;
(9)
Stormwater volume computations for ESD and quantity control;
(10)
Preliminary erosion and sediment control plan that contains
the construction sequence, any phasing necessary to limit earth disturbances
and impacts to natural resources and an overlay showing the types
and locations of ESD and erosion and sediment control practices to
be used;
(11)
A narrative that supports the site development design, describes
how ESD will be used to meet the minimum control requirements, and
justifies any proposed structural stormwater management measures;
and
(12)
Any other information required by the approving authority that
is consistent with the intermediate nature of site development plan
review.
C.
Final stormwater plan. A final stormwater plan shall be of sufficient
detail to permit all stormwater management approvals and permits to
be issued and shall include:
(1)
Final erosion and sediment control plans submitted according to COMAR
26.17.01.05;
(2)
Include construction drawings;
(3)
A report that includes sufficient information to evaluate the effectiveness
of the proposed runoff and control design. The report shall include
but is not limited to the following:
(a)
Geotechnical investigations including soil maps, borings, site
specific recommendations, and any additional information necessary
for the final stormwater management design;
(b)
Drainage area maps depicting predevelopment and post development
runoff flow path segmentation and land use;
(c)
Hydrologic computations of the applicable ESD and unified sizing
criteria according to the Design Manual for all points of discharge
from the site;
(d)
Hydraulic and structural computations for all ESD practices
and structural stormwater management measures to be used;
(e)
Narrative that supports the final stormwater management design;
and
(f)
Any other information required by the approving authority that
is consistent with the final nature of final stormwater plan review.
(4)
Construction drawings that include but are not limited to the following:
(a)
Vicinity Map;
(b)
North arrow;
(c)
Existing and proposed topography;
(d)
Proposed drainage areas including areas necessary to determine
downstream analysis for proposed stormwater management facilities;
(e)
Proposed improvements including the location of buildings and
other structures, impervious surfaces, storm drainage facilities,
and all grading;
(f)
Location of existing and proposed structures and utilities;
(g)
Existing and proposed easements and rights-of-way;
(h)
Delineation of one-hundred-year floodplains and on-site tidal
and nontidal wetlands, where applicable;
(i)
Structural and construction details including representative
cross sections for all components of the proposed drainage system
or systems and stormwater management facilities;
(j)
All necessary construction specifications;
(k)
Sequence of construction;
(l)
Data for total site area, disturbed area, new impervious areas,
and total impervious areas;
(m)
Table showing the ESD and unified sizing criteria volumes required
in the Design Manual;
(n)
Table of materials to be used for stormwater management facility
planting;
(o)
All soil boring logs and locations;
(p)
Inspection and maintenance schedule;
(q)
Owners certification that all stormwater management construction
will be done according to the approved stormwater management plan;
(r)
As-built certification signature block to be executed after
project completion; and
(s)
Any other information required by the approving authority.
(5)
When the stormwater management plan involves direction or redirection
of some or all runoff from the site, a change in stormwater runoff
volume and/or a change in the nature of stormwater runoff from the
site, it is the responsibility of the applicant to obtain from the
adjacent property owners any easements or other necessary property
interests concerning such runoff. Approval of a stormwater management
plan does not create or affect any right to direct runoff onto adjacent
property without the adjacent property owner's permission.
A.
Stormwater management plans shall be prepared by a professional engineer,
professional land surveyor, and/or landscape architect licensed in
the State of Maryland.
B.
If a stormwater BMP requires either a dam safety permit from the
Maryland Department of the Environment or small pond approval by the
Kent Soil and Water Conservation District, the stormwater management
plan shall be prepared by a professional engineer licensed in Maryland.
