A. 
Applicants may utilize any appropriate stormwater management techniques or a combination of techniques as approved by the municipal engineer. Off-site control measures, including storm sewers and/or storage facilities, may be used in accordance with the watershed stormwater plan and as approved by the municipality.
B. 
All such stormwater management techniques shall be in strict conformance with all other applicable regulations, including, but not limited to, dam safety and encroachments, floodplains,[1] and erosion and sedimentation control.
[1]
Editor's Note: See also Ch. 62, Floodplain Protection.
Possible stormwater control measures, including on-site infiltration techniques, detention facilities, and other measures, are described in the Ridley Creek Watershed Plan. Other measures are acceptable when approved by the municipal engineer. Information and standards for developing stormwater management controls may be found in the following references:
A. 
"Urban Hydrology for Small Watersheds," Technical Release No. 55, USDA, Soil Conservation Service, January 1975.
B. 
"Soil Erosion and Sedimentation Control Manual," Pennsylvania Department of Environmental Resources,[1] May 1976.
[1]
Editor's Note: Now Pennsylvania Department of Environmental Protection.
C. 
"Engineering Field Manual for Conservation Practices," USDA, Soil Conservation Service, 1975.
D. 
"Practices in Detention of Urban Stormwater Runoff," Special Report No. 43, American Public Works Association, June 1974.
If special geological hazards or soil conditions are identified on the site, the developer's engineer shall consider the effect of proposed stormwater management measures on these conditions. In such cases, the municipality may require an in-depth report by a competent soils engineer.
Storage facilities shall be designed to control the postdevelopment peak stormwater runoff rates for the two-, ten-, and twenty-five-year design rainfall events to the subarea's release rate percentage or that approved through the downstream impact evaluation.
A. 
Provisions shall also be made for passing the postdevelopment one-hundred-year runoff flows through a stormwater detention facility without damaging or causing failure of (i.e., impairing the continued function of) the facility.
B. 
Storage facilities shared by more than one development site are permitted within a single subarea of the watershed, provided that they meet the above criteria.
C. 
Runoff from the development sites involved shall be conveyed to the facility from its source in a manner so as to avoid adverse impacts, such as flooding or erosion and scour of natural channels, to downstream channels and property.
D. 
Storage facilities shall be located such that they remain accessible for maintenance based upon the type of equipment and procedures required.
E. 
Municipalities may, at their discretion, require any necessary measures to ensure the security and general safety of proposed storage facilities.
When storm sewers are proposed, developers must show:
A. 
Compliance with all other state and local regulations and specifications governing the installation of such systems.
B. 
That there is sufficient channel capacity from the point where the storm sewer outlets into the natural drainage system and further downstream to the base of the watershed.
The safety of the public shall be considered at all times in the design of such facilities and provided for to the satisfaction of the municipal engineer. Except as otherwise provided for by municipal ordinances, the standards and specifications of the Pennsylvania Department of Transportation shall be used in the construction of stormwater collection system components.
The discharge of concentrated, collected stormwater runoff from control facilities, such as detention basins or storm sewers, onto adjacent properties where there is no existing natural watercourse or drainageway to receive the discharge shall be avoided unless deemed absolutely necessary. Where such a discharge is absolutely necessary, easements and/or other provisions shall be proposed, approved, and implemented to prevent damage to the adjacent properties to the satisfaction of the municipal engineer. Where discharges are proposed to natural watercourses and drainageways, such discharges shall be made in a manner so as not to result in property damage or deterioration of channel stability.