2870 24 Amending and Supplementing Chapter 25 Section 29 of the Township of West Orange Municipal Code Stormwater Mgmt RedLined 2

26 § 25-29.8—Safety Standards for Stormwater Management Basins: A. This section sets forth requirements to protect public safety through the proper design and operation of stormwater management BMPs. This section applies to any new stormwater management BMP. B. The provisions of this section are not intended to preempt more stringent municipal or county safety requirements for new or existing stormwater management BMPs. Municipal and county stormwater management plans and ordinances may, pursuant to their authority, require existing stormwater management BMPs to be retrofitted to meet one or more of the safety standards in § 25-29.8c1, c2, and c3 for trash racks, overflow grates, and escape provisions at outlet structures. C. Requirements for Trash Racks, Overflow Grates and Escape Provisions 1. A trash rack is a device designed to catch trash and debris and prevent the clogging of outlet structures. Trash racks shall be installed at the intake to the outlet from the Stormwater management BMP to ensure proper functioning of the BMP outlets in accordance with the following: i. The trash rack shall have parallel bars, with no greater than six-inch spacing between the bars; ii. The trash rack shall be designed so as not to adversely affect the hydraulic performance of the outlet pipe or structure; iii. The average velocity of flow through a clean trash rack is not to exceed 2.5 feet per second under the full range of stage and discharge. Velocity is to be computed on the basis of the net area of opening through the rack; and iv. The trash rack shall be constructed of rigid, durable, and corrosion resistant material and designed to withstand a perpendicular live loading of 300 pounds per square foot. 2. An overflow grate is designed to prevent obstruction of the overflow structure. If an outlet structure has an overflow grate, such grate shall meet the following requirements: i. The overflow grate shall be secured to the outlet structure but removable for emergencies and maintenance. ii. The overflow grate spacing shall be no greater than two inches across the smallest dimension iii. The overflow grate shall be constructed and installed to be rigid, durable, and corrosion resistant, and shall be designed to withstand a perpendicular live loading of 300 pounds per square foot. 3. Stormwater management BMPs shall include escape provisions as follows: i. If a

nd corrosion resistant, and shall be designed to withstand a perpendicular live loading of 300 pounds per square foot. 3. Stormwater management BMPs shall include escape provisions as follows: i. If a stormwater management BMP has an outlet structure, escape provisions shall be incorporated in or on the structure. Escape provisions include the installation of permanent ladders, steps, rungs, or other features that provide easily accessible means of egress from stormwater management BMPs. With Deleted: Section VIII.C.1, VIII.C.2, and VIII.C.3 Deleted: Deleted: less