§ 165-69. Drainage.

All streets shall be designed to accommodate storm drainage along streets, including the installation of drainage inlets and pipes. Any system shall be adequate to handle all water which originates within the development and beyond, calculated on the basis of maximum potential development as permitted under this chapter. No water shall be diverted as to overload existing drainage structures on other lands without proper and approved provisions being made for taking care of these conditions, including off-tract improvements.

A. 

A twenty-five-year storm curve shall be used in computing stormwater runoff.

B. 

The pipe size shall be determined by acceptable drainage design procedures but shall not be less than 15 inches in diameter.

C. 

Drainage inlets shall be located at intervals of not more than 400 feet or such shorter distances as required to prevent the flow of surface water from exceeding six cubic feet per second at the drainage inlet. Access manholes shall be placed at maximum five-hundred-foot intervals throughout the system and at pipe junctions. Drainage inlets shall comply with Chapter 267, Stormwater Control, § 267-4E(3), of the Code of the Borough of Wharton.

D. 

Dished gutters on Borough streets shall be permitted only at intersections involving local streets. Dished gutters shall not be permitted on arterial or collector streets.

E. 

Storm drain pipes running longitudinally along streets shall not be located under curbing.

F. 

Storm drain pipes shall be the size specified and laid to the exact lines and grades approved by the Municipal Engineer. Specifications for manholes, inlets and storm drains shall follow the 1989 State Highway Specifications, as amended.

G. 

Grading shall direct drainage away from all buildings, prevent the collection of stormwater in pools and avoid the concentration of stormwater from one lot to another.

H. 

Where any development is traversed by a watercourse or drainage ditch, a drainage right-of-way easement shall be provided and dedicated to the Borough of sufficient width to accommodate expected stormwater runoff in the future based upon reasonable growth potential in the Borough. A minimum of 15 feet beyond the bank top on at least one side shall be provided for access to the drainage right-of-way. See § 165-57.

I. 

Where storm drain pipes are installed outside of streets, easements or rights-of-way shall be required in accordance with § 165-57.