For any proposed development, the owner/developer shall submit phased stormwater management plans to the Department of Public Works for review and approval. At a minimum, plans shall be submitted for the concept, site development, and final stormwater management construction phases of project design. Each plan submittal shall include the minimum content specified in § 465-14 of this chapter and meet the requirements of the Design Manual and Article IV of this chapter.
The Department of Public Works shall perform a comprehensive review
of the stormwater management plans for each phase of site design.
Coordinated comments will be provided for each plan phase that reflect
input from all appropriate agencies, including but not limited to
the Harford Soil Conservation District (HSCD) and the Departments
of Planning and Community Development and Public Works of the City
of Aberdeen. All comments from the Department of Public Works and
other appropriate agencies shall be addressed and approval received
at each phase of project design before subsequent submissions.[1]
The owner/developer shall submit a concept plan that provides sufficient information for an initial assessment of the proposed project and whether stormwater management can be provided according to § 465-11 of this chapter and the Design Manual. Plans submitted for concept approval shall include, but are not limited to:
A map at a scale specified by the Department of Public Works showing
site location, existing natural features, water and other sensitive
resources, topography, and natural drainage patterns;
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;
Following concept plan approval by the Department of Public Works,
the owner/developer shall submit site development plans that reflect
comments received during the previous review phase. Plans submitted
for site development approval shall be of sufficient detail to allow
site development to be reviewed and include but not be limited to:
Final site layout, exact impervious area locations and acreages,
proposed topography, delineated drainage areas at all points of discharge
from the site, and stormwater volume computations for ESD practices
and quantity control structures;
A proposed 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 plan showing the types and locations
of ESD and erosion and sediment control practices to be used;
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 measure; and
Following site development approval by the Department of Public Works,
the owner/developer shall submit final erosion and sediment control
and stormwater management plans that reflect the comments received
during the previous review phase. Plans submitted for final approval
shall be of sufficient detail to allow all approvals and permits to
be issued according to the following:
Final stormwater management plans shall be submitted for approval
in the form of construction drawings and be accompanied by a report
that includes sufficient information to evaluate the effectiveness
of the proposed runoff control design.
Geotechnical investigations, including soil maps, borings, site-specific
recommendations, and any additional information necessary for the
final stormwater management design;
Existing and proposed topography and proposed drainage areas, including
areas necessary to determine downstream analysis for proposed stormwater
management facilities;
Structural and construction details, including representative cross
sections for all components of the proposed drainage system or systems
and stormwater management facilities;
If a stormwater management plan involves direction of some or all
runoff off of the site, it is the responsibility of the developer
to obtain from adjacent property owners any easements or other necessary
property interests concerning flowage of water. Approval of a stormwater
management plan does not create or affect any right to direct runoff
onto adjacent property without that property owner's permission.
The design of stormwater management plans shall be prepared by any
individual whose qualifications are acceptable to the Department of
Public Works. The Department of Public Works may require that the
design be prepared by either a professional engineer, professional
land surveyor, or landscape architect licensed in the state, as necessary
to protect the public or the environment.
If a stormwater BMP requires either a dam safety permit from MDE
Department of Public Works or small pond approval from the Harford
County Soil Conservation District, the Department of Public Works
shall require that the design be prepared by a professional engineer
licensed in the state.