A. The storm water management plan shall be filed as part of the application required for a Site Plan and as part of the application required for a major subdivision variance, building permit, soil removal permit or soil erosion and sedimentation control permit

B.The Planning Board or Zoning Board of Adjustment may waive any, specific requirement for the storm water management plan after consideration of the recommendations and findings of the Township Engineer and the Environmental Commission that there is no appreciable increase anticipated in rate, velocity or quantity of runoff based on the submitted subdivision or site plan or where such waiver would be in the best interest of the Township

A.The storm water management plan shall be reviewed by the Planning Board or Zoning Board of Adjustment with the advice and assistance of the Township Engineer and the Environmental Commission In addition, the Boards may refer the plan to any outside consultant or concerned agency, fees for which shall be paid for by the applicant The Board's consideration of the plan shall be guided by. but not limited to, the following factors

1 The suitability of the applicant's proposed surface water management techniques, involving on-tract and/or off-tract measures. in respect to the total storm water run-off. velocities and rates of discharge which the applicant's proposed construction or land disturbance may generate

2 Existing topography. present vegetation and hydrologic soil factors

3 Ground water recharge and discharge areas. wet soils, alluvial and poorly drained soils. and seasonal high ground water table level

4 The design storms as specified in Section 12.3.3

5 Natural drainage flow and pattern throughout the watershed(s) affected by, the plan

6. The nature of the watershed of which the proposed development is a part and the receiving stream channel capacities.

7 Land uses in both the immediate vicinity and surrounding drainage region

8 Any other applicable or relevant environmental and resource protection ordinances, statutes and regulations

9 Any other factors relevant to the coordinated and harmonious development of the site. vicinity, township and region

B.If the Board determines that the proposed development will satisfy the standards of this Ordinance, the Board shall approve the storm water management plan as part of the site plan approval or subdivision approval.

C. If the Board determines that the proposed development will generate or alter storm water runoff which will not be managed in accordance with the standards of this Ordinance, the Board shall disapprove the proposed site plan or subdivision. stating the reasons

D.The Board may condition its approval of the storm water management plan by imposing lawful conditions or requirements These conditions and requirements shall be provided and maintained as a condition to the establishment. maintenance and continuance of any use or occupancy of any structure or land

The storm water management plan shall include the following

A.Lot and block numbers of the site as shown on the current Tax Map of the Township

B.Name(s) and address(es) of the owner(s) of the site Size and location of the site on a map of the watershed(s)

C.Location. description and quantification of significant natural and manmade features on and surrounding the site. including topography, all impervious surfaces, soil and drainage characteristics with particular attention to the location and description of presently existing surface water runoff control devices, mechanisms or areas, water courses, swamps, flood plains, swales. berms, woods and vegetation. steep slopes and other features critical to the purposes of this Ordinance

D.Location, description and quantification of proposed changes to the site whether of a permanent or temporary nature with particular attention to impervious surfaces and interception of presently dispersed flow which may impact upon the capacity of the soil, vegetation cover and drainage ways to absorb. retard, contain or control storm water runoff.

E.Proposed measures for storm water management

F.1 Computations, using the "rational" method (Q=CIA). showing both the peak rate and peak velocity and total quantity of storm water runoff from the site both before and after the proposed development, under the following conditions a "ten-year storm". 2 1 inches of rain during a sixty minute period, and a "one hundred-year storm", 3.5 inches of rain during a sixty minute period, where the rain is assumed to be falling at a uniform rate during the specified period The following runoff coefficients shall be used for the various soil, vegetation, and other surface conditions

2. Where the applicant feels that the required computations do not adequately reflect the true impact of the proposed development on stormwater control, additional computations, using any acceptable engineering approach with data from any documented source, may be included in the plan.

G. If, in the opinion of the Board, a complete hydrograph is needed to adequately analyze the proposed development, a hydrograph for the specified "ten year" and "one hundred year" storms shall be included. When required, such hydrographs shall show, in graphical form, the water flow time sequence for runoff from the site. Supporting calculation details shall be furnished indicating the assumptions and formulae used, including relevant intermediate results such as the water flow time profile of the inflow to a retention or detention basin and the control characteristics and physical design of the discharge rate metering device (storm water pipe, weir, etc.).

H. Appropriate plans, profiles and cross sections every fifty (50) feet, of all proposed and existing culverts, bridges, storm sewers, drainage ditches and streams within the subdivision, and within three hundred (300) feet upstream and downstream of the subdivision, together with their sizes, elevations, grades and capacities as approved by the Township Engineer.

I. A flood routing of the discharge channel shall be provided so that the coordination of discharges proposed from the tract with those from off-tract and the effects of stream bank erosion can be analyzed

J. Designation of critical or other areas to be left undisturbed shall be shown in sufficient detail to be accurately marked on the plan

K. Schedule of the implementation of the storm water management plan, related to the starting and completion dates of the development

L. Proposed maintenance schedule for all storm water management structures, stipulating current maintenance, continued maintenance, and responsibility for same.

M. All revisions of the plan and such additional data as the Board may require

A.General Standards In the preparation of a surface water management plan, the following general principles shall be adhered to.

1. The maximum rate and velocity of storm water runoff from the site following completion of the proposed development shall not exceed that which is prevailing prior to development.

2. Maximum use shall be made of presently existing storm water runoff control measures, mechanisms or areas such as existing berms, terraces, grass waterways, favorable hydrologic soils, swamps, swales, water curses, woodlands, flood plains, as well as any proposed management structures.

3. The plan shall be compatible with the Soil Erosion and Sediment Control Plan required by the Somerset/Union Soil Conservation District

4. The plan shall avoid concentration of flow and shall provide for reduction of velocities at all discharge points

5. Re-establishment of vegetative cover shall be in accordance with "Standards for Soil Erosion and Sediment Control in New Jersey," c. 25 1, P.L. 1975.

6. The plan shall conform to the requirements of the Berkeley Heights Tree Removal Ordinance.

7 The plan shall establish permanent surface water management measures prior to construction or other land disturbance including seeding and establishing sod in grass waterways

B.Detail Design Standards

1 All outfalls shall be designed in a manner to reduce velocities at the outfall and provide wherever possible for the dissipation at the discharge points and provide stream channel protection

2 All structures and land treatment practices shall conform to "Standards for Soil Erosion and Sediment Control in New Jersey," c 25 1. P L 1975

3 All water carrying structures and retention and detention areas shall be completed and stabilized prior to diversion of water to them.

4 Drainage ways and watercourses which normally carry or receive storm water runoff shall not be overloaded with increased runoff, sediment or other pollution resulting from disturbance of soil and vegetation or incident to development, construction or other activity.

C. Plan Implementation

1 Limit of Construction Critical areas or other areas to be left undisturbed shall be physically marked with survey stakes or protected with temporary snow fencing prior to any land disturbance

2 Timing The Board shall require the construction and installation of storm water management improvements in accordance with the approved implementation schedule of the Site Plan or Subdivision.

3. Inspection The applicant shall bear full and final responsibility for the installation and construction of all required storm water runoff control measures required by the approved plan formulated under this Ordinance

The Township Engineer shall inspect the site during its preparation and development.

4. Maintenance. Interference with Watercourses

a. No person shall place or cause to be placed any obstruction of any kind whatsoever or remove, change, alter, destroy or interfere in any way whatsoever, with any stream, pond, spring lake or natural watercourse of any kind so as to interfere with the natural flow or change the course or location thereof in any manner whatsoever, whether the same is located on public or private property and whether said prohibited act or acts are conducted upon the property of the actor or not, without first obtaining the necessary permission to do so from the Township Committee upon written application made for such purpose to the Township Committee.

b The Township shall retain the right to enter and make repairs and improvements where necessary to insure that all control measures as well as areas dedicated to storm water retention and detention or ground water recharge are adequately maintained and preserved. The Township shall charge the owner for the costs of these services if such maintenance is specified in the plan to be the owner's responsibility.