A. Residential uses.
Density may be increased up to 4.5 times the rate permitted in the underlying zoning district, provided the public stormwater improvements meet the requirements of
§ 208-161A(3), and exceed the baseline peak rate control requirements in
Chapter 174: Stormwater Management, by 50% for all design storms. The rate permitted in the underlying zoning district shall be demonstrated through the submission of a by-right plan that complies with the requirements of that underlying zoning district.
B. Building and impervious coverage.
(1) Impervious coverage may be increased up to the limits provided in Subsection B(1)(a) or (b) below, provided at least two times the amount of additional impervious cover sought is converted to porous paving that complies with current stormwater management requirements. A secondary, conventional inlet/piping system or other drainage element will be required to ensure transmission of surface water into the underground storage and infiltration bed. An operations and maintenance plan for long-term maintenance of the porous paving system also will be required to be submitted and approved by the Township Engineer, and recorded along with the stormwater management plan at the Chester County Recorder of Deeds.
(a) For nonresidential uses, impervious coverage may be increased up to 10% above the by-right limit if the conditions in § 208-164B(1) above are met.
(b) For residential uses, impervious coverage may be increased up to 5% above the by-right limit if the conditions in § 208-164B(1) above are met.
(2) If a green roof is included on any building, a credit of 50% of the area of the green roof will be applied to the calculation of impervious coverage; provided, however, that the foregoing credit shall have no effect on the calculation of impervious area pursuant to meeting the requirements of
Chapter 174: Stormwater Management or the requirements for public stormwater improvements in this article.
(3) Building coverage requirements in the underlying district shall not apply.
