Article IV: Stormwater Management Site Plan Requirements

"D. Stormwater management facilities.

1. All stormwater management facilities must be located on a stormwater management plan and described in detail, including:

a) Groundwater recharge methods such as seepage pits, beds or trenches. The location of the proposed structure, including a detailed cross-section. If these structures are proposed, the locations of septic tank infiltration areas and wells must be shown. Groundwater recharge methods must comply with the additional requirements in Subsection D(2) of this section.

b) Other control devices or methods, such as rooftop storage, semipervious paving materials, grass swales, parking lot ponding, vegetated strips, detention or retention basins, storm sewer, etc.

c) Cross-sections of any detention or retention basins showing the relationship between the existing topography and the proposed bottom, spillway, top of embankment and the outlet structure and the corresponding proposed finished grade elevations. A detail of the outlet structure shall be provided, including all pertinent construction requirements.

d) A schedule for the installation of the stormwater management facilities. In all cases, the stormwater management facilities must be completed prior to the creation of additional impervious surface.

2. The following additional requirements apply to all proposed groundwater recharge methods such as seepage pits, beds, trenches, leaching wells and cisterns:

a) Representative percolation tests must be made throughout the area proposed for development. At least one percolation test must be included in each soil group and at least one percolation test must be conducted for each five lots proposed for development. The percolation test must be sampled at the invert depth of the proposed structure.

b) Seepage pits, beds or trenches shall not be permitted for any development of more than five lots without prior approval of the Township."

Link to East Manchester Township Act 167 Ordinance