§ 53.046 CONTENTS OF STORMWATER MANAGEMENT PLANS.

   (A)   (1)   The developer is responsible for submitting a stormwater management plan that meets the design requirements of this chapter. The plan shall be accompanied by a report that includes sufficient information to evaluate the environmental characteristics of affected areas, the potential impacts of the proposed development on water resources, and the effectiveness and acceptability of measures proposed for managing stormwater runoff. An engineer licensed in the state shall certify on the drawings that all clearing, grading, drainage, construction and development shall be conducted in strict accordance with the plan. If a stormwater management plan involves direction of some or all runoff off of the site, it is the responsibility of the developer to obtain from adjacent property owners any easements or necessary property interests concerning flowage of water. Approval of a stormwater management plan does not create or affect any right to direct runoff onto adjacent property without that property owner’s permission.

      (2)   The minimum information submitted for support of a stormwater management plan or application for a waiver shall be as follows.

   (B)   Reports submitted for stormwater management plan approval shall include:

      (1)   A brief narrative description of the project;

      (2)   Geotechnicial investigations including soil maps, borings, site-specific recommendations and any additional information necessary for the proposed stormwater management design;

      (3)   Descriptions of all watercourses, impoundments and wetlands on or adjacent to the site or into which stormwater directly flows;

      (4)   Hydrologic computations, including drainage area maps depicting pre-development and post-development runoff flow path segmentation and land use that demonstrate compliance with §§ 53.030 through 53.032 of this chapter;

      (5)   Hydraulic computations;

      (6)   Structural computations;

      (7)   Unified sizing criteria volume computations according to the Design Manual; and

      (8)   Any other information required by the Town Planning and Zoning Commission, its agent(s) or the Town Engineer.

   (C)   Construction drawings submitted for stormwater management plan approval shall include the following:

      (1)   A vicinity map;

      (2)   Topography survey showing existing and proposed contours, including the area necessary to determine downstream analysis for proposed stormwater management facilities;

      (3)   Any proposed improvements including location of buildings or other structures, impervious surfaces, storm drainage facilities and all grading;

      (4)   The location of existing and proposed structures and utilities;

      (5)   Any easements and rights-of-way;

      (6)   The delineation, if applicable, of the 100-year floodplain and any on-site wetlands;

      (7)   Structural and construction details for all components of the proposed drainage system or systems and stormwater management facilities;

      (8)   All necessary construction specifications;

      (9)   A sequence of construction;

      (10)   Data for total site area, disturbed area, new impervious area and total impervious area;

      (11)   A table showing the unified sizing criteria volumes described in the Design Manual;

      (12)   A table of materials to be used for stormwater management facility planting;

      (13)   All soil boring logs and locations;

      (14)   A maintenance schedule;

      (15)   Certification by a state certified engineer that all stormwater management construction will be done according to this plan;

      (16)   An as-built certification signature block to be executed after project completion; and

      (17)   Any other information required by the Town Planning and Zoning Commission, its agent(s) or the Town Engineer.

(Ord. passed 7-14-2008)