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Bridges of primary benefit to the applicant, as determined by the Commission, shall be constructed at the full expense of the applicant without reimbursement from the county. The sharing of expense for the construction of bridges not being of primary benefit to the applicant as determined by the Commission will be through special agreement between the county and the applicant. Said cost shall be charged to the applicant pro-rata as the percentage of his land developed and so served.
(Ord. passed - -)
(A) New perimeter streets. Street systems in new subdivisions shall be laid out so as to eliminate or avoid new perimeter half-streets.
(1) Where an existing half-street is adjacent to a new subdivision, the other half of the street shall be improved and dedicated by the subdivider.
(2) The Commission may authorize a new perimeter street where the subdivider improves and dedicates the entire required right-of-way width within his own subdivision’s boundaries.
(B) Widening and realignment of existing streets. Where a subdivision boarders an exiting narrow street or when the Comprehensive Plan, Official Map, Thoroughfare Plan, or zoning setback regulations indicate plans for realignment or widening of a street that would require use of some of the land into the subdivision, the applicant shall be required to improve and dedicate such streets at his own expense. Land reserved for any street purposes may not be counted in satisfying the yard or area requirements of the Zoning Ordinance.
(Ord. passed - -)
DRAINAGE AND STORM SEWERS
The system of storm sewers, inlets, and catch basins within a specific development area shall constitute a minor system. A major system shall include drainage systems, including the portion of a watershed that will become operative once the capacity of a minor system is exceeded. This includes streets or other depressed areas that will act as open channels and convey the excess storm water runoff to a natural drainage course or storage facility.
(A) The Commission shall not recommend for approval any subdivision plat which does not make adequate provisions for storm or flood water runoff channels or basins.
(B) The storm water drainage system shall be separate and independent of any sanitary sewer system.
(C) Storm sewers, where required, shall be designed by the Rational Method, or other methods as approved by the Commission and the County Drainage Board. A copy of the design computations shall be submitted along with the plans. (The rational method is described in Chapter Three of the County Storm Drainage Manual by Christopher B. Burke, Project for Indiana Counties and Cities, School of Civil Engineering, Purdue University, West Lafayette, May 1981, hereinafter referred to as the Drainage Manual).
(D) Inlets shall be provided so that surface water is not carried across or around any intersection, nor for a distance of more than 600 feet in the gutter or when the encroachment of storm water into the street disrupts traffic (Drainage Manual, p. 5-27).
(E) When calculations indicate that curb capacities are exceeded at a point, no further allowance shall be made for flow beyond that point, and catch basins or inlets shall be used to intercept flow at that point.
(F) Surface water drainage patterns shall be shown for each and every lot and block.
(Ord. passed - -)
The design storm event return period shall be calculated as follows.
(A) Minor systems shall be designed to handle a 25-year, 24-hour rainfall event.
(B) Major systems shall be designed to handle a 50-year, 24-hour rainfall event.
(C) All systems shall include an investigation of the impact of the 100-year, 24-hour rainfall event, backwater from any perennial stream, and any flood plain encroachment.
(D) All systems which discharge into an existing drainage system, which has been determined by the local jurisdiction to be at or near maximum capacity, shall be designed for the storage of the excess storm runoff. The release rate shall be designed for the existing (redevelopment) five year, 24 hour event.
(Ord. passed - -)
(A) The minimum pipe size for systems shall be 12 inches.
(B) A minimum flow velocity of three feet per second at full flow shall be maintained throughout the drainage system.
(C) A maximum flow velocity of eight feet per second at full flow shall be maintained throughout the drainage system.
(D) Manholes and inlets shall be placed at each junction, grade change, or direction change. The maximum spacing between each manhole and inlet shall be 300 feet.
(E) The minimum depth from grade for the top of any storm sewer shall be three feet. In any case where such three feet minimum cover cannot be maintained, an extra strength pipe shall be used.
(F) Permitted materials shall include PVC SDR-35, reinforced concrete or vitrified clay tile, from 12 to 36 inches in diameter. Pipes larger than 36 inches shall be reinforced concrete or steel plate.
(Ord. passed - -)
(A) The developer shall provide the appropriate local jurisdiction with an exiting topographic site plan and proposed topographic site plan with one foot contours.
(B) The developer shall provide to the local jurisdiction all calculations used to determine drainage flows and capacity determinations.
(C) The developer shall install all required drainage facilities for the minor system and connection to a major system. If the local jurisdiction anticipates future development in the area, the minor or major systems may be required to be oversized to accommodate future development. The cost of oversizing may be borne by the local jurisdiction.
(Ord. passed - - ; Am. Ord. 19-2005, passed 7-5-2005)
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