A drainage plan fulfilling the requirements of this Article and Board regulations shall be submitted to the Board for approval before a drainage permit can be obtained to accomplish a land alteration, unless the land alteration is such that a drainage permit can be obtained in accordance with Section 7-12. The drainage plan must be submitted in triplicate, and shall indicate in a precise way the work to be accomplished pursuant to the drainage permit. One (1) copy of the drainage plan will remain on file with the Board. The following information must be submitted for approval:
(a) Construction Features. The drainage plan shall demonstrate and describe surface and subsurface drainage and include the following:
Scale; Arrow; Contours and USGS Bench Marks: The drainage plan shall be drawn to scale, preferably one (1") inch per fifty (50') feet, and an arrow indicating North shall appear on each page. Existing land contours shall be shown, with one-foot (1') contours for land with a slope flatter than ten (10%) percent, two (2') foot contours for slopes equal to or greater than ten percent (10%) but flatter than twenty percent (20%), and five-foot (5') contours for slopes equal to or greater than twenty percent (20%). A bench mark, which is easily accessible pavement or shoulder, the existing ground over the storm drain with proposed grading shall be shown with the centerline grade of the road. If the storm drain is to be constructed on fill, the profile of the undisturbed earth, at drain location, shall be shown.
(b) Design Calculations. Design calculations are required as part of the drainage plan and shall specifically include:
(1) Estimation of Storm Water Runoff:
(a) Drainage area map (scale one (1") inch equals one hundred (100') feet indicating contours at two-foot intervals and limits of 100-year floodplain, where applicable;
(b) Weighted runoff coefficient computations;
(c) Time of concentration computation indicating overland flow time and flow time in the swale, gutter, pipe or channel. All drainage facilities shall be designed in conformity with drainage and design standards and regulations as enacted and as may be amended from time to time by the Board.
(2) Closed Conduit And Open Channel Design Computations:
(a) Size of pipe or channel cross section;
(b) Pipe or channel invert's slope in percent;
(c) Roughness coefficient;
(d) Flow velocities in feet per second;
(e) Design capacity in cubic feet per second;
(3) Head Loss Computations In Manholes And Junction Chambers:
(4) Hydraulic Gradient Computations, wherever applicable;
(5) Erosion Control Methods. All design calculations shall conform with the drainage and design standards and regulations as enacted and as may be amended from time to time by the Board.
(c) Additional Information. The Board shall be empowered to require such additional information to be included in a drainage plan that is necessary to evaluate and determine the adequacy of the proposed drainage facility.
(d) Certification Required. All drainage plans submitted under this section to the Board for approval must be certified by a registered professional engineer, land surveyor or architect engaged in storm drainage design under whose supervision the plans were prepared. The certificate shall be in the following form:
CERTIFICATE OF SUFFICIENCY OF PLAN
Permit Number
Location where land alteration is occurring
Plan Date
I hereby certify that to the best of my knowledge and belief:
(1) The drainage plan for this project is in compliance with the drainage requirements of the Town of Dyer pertaining to this class of work.
(2) The calculations, designs, reproducible drawings, masters and original ideas reproduced in this drainage plan are under my dominion and control and they were prepared by me and my employees.
Signature Date
Type or Printed Name Phone
(SEAL)
Business Address
Surv. Eng. Arch.
Indiana Registration No.
(3) Obligation To Observe. All drainage plans submitted under this section to the Board must include a certificate of obligation to observe by a registered professional engineer, land surveyor or architect engaged in storm drainage design. The certificate shall be in the following form:
CERTIFICATE OF OBLIGATION TO OBSERVE
Permit Number
Location where land alteration is occurring
Plan Date
I will perform periodic observations of this project during construction to determine that such land alteration is in accordance with both the applicable drainage requirements and the drainage plan for this project submitted for a drainage permit to the Storm Water
Management Board.
Signature Date
Type or Printed Name Phone
(SEAL)
Business Address
Surv. Eng. Arch.
Indiana Registration No.
(Ord. No. 92-4, § 6, 2-10-92)