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Town of Smithfield
Land Development & Subdivision Regulations
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§ VI-A

Required Improvements

Land Development and Subdivision Review Regulations Town of Smithfield, RI SECTION VI.

IMPROVEMENTS TO THE LAND

ARTICLE A. REQUIRED IMPROVEMENTS. Developers shall, at their own expense, construct Improvements to the Land in accordance with the Specifications of these Regulations or otherwise designated Town Officials. Required Improvements are as follows:

  1. Street Rights-of-Way. Street Rights-of -Way shall be cleared and grubbed for their entire width in accordance with the Specifications in Section VII, Article B. of these Regulations.
  2. Streets. Streets shall be graded, graveled, and paved in accordance with the Specifications in Section VII, Article B and the Typical Section.
  3. Street Signs. Street signs, including but not limited to, street name signs, stop signs, and the like, shall be installed immediately after grading and preparation of sub-base. Street signs shall be of the size, type, location, and number specified by the Planning Board and based upon the recommendations of the Director of Public Works.
  4. Curbs. Curbs shall be installed in conformance with the Specifications in Section VII, Article C and the Typical Section in these Regulations.
  5. Sidewalks. Sidewalks may be req1fued if the Planning Board feels a safety hazard may exist ; between vehicular and pedestrian traffic and, if so required, shall be installed in accordance with the Specifications in Section VII, Article D and the Typical Section in these Regulations.
  6. Surface and Subsurface Storm Drainage. Stormwater management within a proposed development shall be designed to minimize the volume and rate of runoff and to encourage infiltration into the ground. Wherever possible, grass swales and sheet flow of stormwater over unpaved areas shall be employed instead of curbs and gutters and closed or piped drainage systems. Where practical, in lieu of a single large detention or retention area, a series of smaller basins shall be employed. Drainage systems may be located within designated open space areas with the permission of the Planning Commission. Drainage detention or retention basins shall be suitably landscaped and integrated into the overall site design as provided in Section X, Articles L&M.
    1. Connections –Where determined to be necessary by the Planning Board, structures and facilities shall be installed and connected to the public storm sewer-system, catch basins, watercourses, or dry wells.
    2. Storm Water Runoff Criteria -Storm Water (Runoff Calculations shall be Certified by a Professional Engineer and submitted with the Preliminary Plan. All Storm Water Collection Systems shall be designed using the formulations as specified in Technical Release 55 (TR55) as published by the United States Department of Agriculture, Soil Conservation Services (USDA/SCS).
      1. Peak Flow -Storm Sewers should carry the peak flow of a 25- Year 24-Hour Storm with Type III Distribution. Portions of peak flows from larger storms can be allowed to flow down the road and shall be caught in catch basins at all low points. No flooding of buildings or washing out of areas due to overland flow shall occur.
      2. Road Culverts for Subdivision Roads should have the capacity to handle the peak flow from a 25-year storm without flooding the road or causing upstream buildings to be flooded, All detention basins shall be designed for 25 or 100 years storms as determined by the Planning Board.
      3. Road Culverts for State Highways and Major Town Roads (that is, "through streets" and heavily traveled Town roads) should handle the peak flow from a 100-year storm without flooding the road or causing flooding of upstream buildings.
    3. Conduit Design Criteria - The capacity of conduits shall be calculated by the following formulas: Q= (A)(V) wherein: Q = cubic feet per second Discharge A = cross-sectional area of water, in square feet V = Velocity, in feet per second Velocity of Flow shall be determined by the Manning Formula as follows: V = (1.486/n) x R2/3 x S1/2 wherein: n = Factor for Conduit Roughness "n" Values n = 0.013 Reinforced Concrete Pipe {up to 18") n = 0.012 Reinforced Concrete Pipe (18" or larger) n = 0.035 Stone Rip-Rap Channels n = 0.030 Grass Channels n = other Other Conduits, as cited by the State factor DOT values R = Hydraulic Radius, in feet Cross Section Area (wetted perimeter, in feet) S = Slope of Pipe, in feet/feet -except where the system will be surcharged when the outfall is expected to be submerged with design storm flow. "S" (design gradient) in this case shall be the hydraulic gradient of the pipe crown and the free water surface. For open conduits, "S" shall be the hydraulic gradient of the water. Calculations shall include provisions for entrance and exit losses of head in all conduits. Velocities in storm culverts shall not exceed 10 (ten) feet/second.
    4. Cross Culverts for Storm Water Pipes shall not be less than 15" (fifteen inches) in diameter. Those pipes serving only as conduits from a single catch basin to a main conduit shall not be less that 12" (twelve inches) in diameter.
    5. Grass Cover Open Channels shall not exceed 2.5' (two and one-half feet) per second flow velocity at design storm.
    6. Riprap Open Channels shall not exceed 8' (eight feet) per second flow velocity at design storm.
    7. Underground Storm Water Conduit - shall be of Reinforced Concrete Pipe, minimum Class III, Poly Vinyl Chloride Pipe (of acceptable strength and rating as approved by the Municipal Engineer) or other equal piping.
    8. High Water Table Conditions -Where a subsurface drainage system is used to reduce a high water table condition, the Planning Board may allow the above formula to be altered to accommodate the same.
  7. Permanent Soil Erosion and Sediment Control Structures. Permanent Soil Erosion and Sediment Control Structures shall not be built upon lots that will not have other real property built upon them unless deemed required by the Planning Board due to the particular, unique conditions of the property. Page 48 Land Development and Subdivision Review Regulations Town of Smithfield, RI
  8. Water Mains. If the development is within 2,500' (twenty-five hundred feet) of the perimeter of a public water system, the development must be connected to said system unless denied connection by the appropriate water district. All service piping shall be installed in accordance with the regulations of the appropriate water district.
  9. Sanitary Sewers. Sanitary Sewer Lines shall be installed and paid for by the developer of proposed subdivisions/land development projects who are within the dimensional limits from an existing sewer system as identified in Section 18 of the Codified Ordinances of the Town of Smithfield.
    1. Installation -Sanitary Sewer Lines shall be installed by the developer in accordance with the directions and specifications of the appropriate sewer district and its engineers. The appropriate sewer district's inspectors shall conduct interim inspections of the sewer line installation.
    2. Capping -Sanitary .sewers shall be installed in accordance with the appropriate sewer district's Master Sewer Plan. Sewer pipes shall be capped or plugged at the ends pending later connection to the mains.
    3. Laterals and Fittings -The developer shall furnish and install the proper fittings in sewer lines and shall include branch connections to the lot lines of each lot (laterals) to prevent the necessity of excavating within the street rights-of-way at a later date.
    4. Sewer District Approval -The Planning/Board shall not grant Preliminary Plan Approval to any development project where sanitary sewers are required unless and until Written Certification is received fr