[Ord. 252, 5/24/2004, § 101]
1. 
The Borough Council of Dublin Borough finds that:
A. 
Inadequate management of accelerated stormwater runoff resulting from development throughout a watershed increases flood flows and velocities, contributes to erosion and sedimentation, overtaxes the carrying capacity of existing streams and storm sewers, greatly increases the cost of public facilities to convey and manage stormwater, undermines floodplain management and flood reduction efforts in upstream and downstream communities, reduces groundwater recharge and threatens public health and safety.
B. 
A comprehensive program of stormwater management, including reasonable regulation of development and activities causing accelerated erosion, is fundamental to the public health, safety, welfare, and the protection of the people of the Borough and all the people of the commonwealth, their resources, and the environment.
[Ord. 252, 5/24/2004, § 102]
1. 
The purpose of this chapter is to promote health, safety, and welfare within the Tohickon Creek Watershed by minimizing the damages described in § 25A-101, Subsection 1A, of this chapter through provisions designed to:
A. 
Manage accelerated runoff and erosion and sedimentation problems at their source by regulating activities that cause these problems.
B. 
Utilize and preserve the existing natural drainage systems.
C. 
Encourage recharge of groundwater where appropriate and prevent degradation of groundwater quality.
D. 
Maintain existing flows and quality of streams and watercourses in the Borough and the commonwealth.
E. 
Preserve and restore the flood-carrying capacity of streams.
F. 
Provide proper maintenance of all permanent stormwater management facilities that are constructed in the Borough.
G. 
Provide performance standards and design criteria for Borough-wide stormwater management and planning.
[Ord. 252, 5/24/2004, § 103]
The Borough is empowered to regulate land use activities that affect runoff by the authority of the Act of October 4, 1978, 32 P.S. § 1, 1 P.L. 864 (Act 167) § 680.1 et seq., as amended, the "Storm Water Management Act" and the Pennsylvania Borough Code.
[Ord. 252, 5/24/2004, § 104]
1. 
Any landowner or any person engaged in the alteration or development of land which may affect stormwater runoff characteristics shall implement such measures consistent with the provisions of the Tohickon Creek watershed stormwater plan.
2. 
This chapter shall apply to all areas of the Borough that are located within the Tohickon Creek Watershed, as delineated in Appendix D, attached and made a part hereof.
[Ord. 252 5/24/2004, § 105]
Any regulated activity that meets the following exemption criteria is exempt from the requirements of § 25A-303, Subsection 1, of this chapter. This exemption does not relieve the landowner or developer from complying with water quality and groundwater recharge standards under § 25A-303, Subsection 3, and the special requirements under § 25A-304, Subsection 12, for areas within exceptional value and high quality sub-watersheds. Further, this exemption shall not relieve the applicant from implementing such measures as are necessary to protect health, safety, and property.
Stormwater Management Exemption Criteria*
Total Parcel size
(acres)
Minimum Setback Distance**
(feet)
Impervious Area Exemption
(square feet)
0 - 0.5
10
1,200
0.5 - 1
50
2,500
1 - 2
100
4,000
2 - 5
250
5,000
5
500
7,500
*
This exemption is cumulative such that it applies only once to a tract, and if the exemption amount is exceeded, it is not applicable and all previously exempted impervious areas must be managed.
**
The minimum setback distance is measured between the proposed impervious area and/or stormwater control/structure/discharge point to the downslope property boundary. In lieu of meeting the minimum distance criteria, the applicant may provide documentation for Township approval from any professional authorized to perform this work under the Engineer, Land Surveyor, and Geologist Registration Law, May 23, 1945, P.L. 913, No. 367, (63 P.S. § 148 et seq., P.L. 913, as amended) that the increased flows from the site leaves the site in the same manner as the predevelopment condition, and that there will be no adverse effects to the property along the path of the flow(s) or that increased flow(s) will reach a natural watercourse or an existing stormwater management structure before adversely affecting any property along the path of the flow(s).