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This update provides information on the MDOT calculations for Drainage Districts, including the basis for the calculations, apportionment formula, required information for submission, and the review process.
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Michigan Association of County Drain Commissioners 14A Update Jim Davis, MDOT Alan Boyer, LSG E&S February 16, 2017 macdc.us
1.Petition for Drain 2.Board of Determination - Finding of Necessity 3.Day of Review 4. Construction 14A Update - MDOT Calculations Send MDOT apportionment for MDOT review a minimum of 20 days before Day of Review. • Scaled Drainage District Map • 14a Calculations macdc.us
14A Update - MDOT Calculations • Basis for 14a Calculations • Drain Code: Public Act 40 of 1956 • State Funding Appropriations: Act 51 of 1951, MCL 247.664a • Act 51 established the transportation fund and provides for its spending & administration of funds. • PA 327 of 1972 amends Act 51 including Section 14a. Act 51 Drain Code macdc.us
14A Update - MDOT Calculations • Basis for 14a Calculations • Section 14a of amendatory 1972, PA 327 provides for the expenditures of funds allocated by the act to the Department of State Highways and to the county road commissions to pay the cost of drain assessments under the Drain code with respect to state and county highways • Section 14a of 1951, PA 51, as added by 1972, PA 327, is not an amendment to the Drain Code of 1956. Act 51 Drain Code macdc.us
14A Update - MDOT Calculations • Apportionment Based on a Formula called 14a Calculations. • Benefits are based on a pro rata share of storm water runoff from highways in the district in direct portion to the entire district. • Supplemental Benefits • MDOT pays for improvements/construction methods that MDOT requires. • Requires agreement between MDOT and County Drain Commissioner. Y% X% macdc.us
14A Update - MDOT Calculations • Information that is required for the MDOT 14a Calculation Submittal • Per Drain Code, MDOT needs a minimum of 20 days before the Day Of Review. • Map of Drainage District • Area of Drainage District (Land Use Type) • Area of MDOT right-of-way in Drainage District • Drainage District runoff coefficient(s) • MDOT right-of-way runoff coefficient • MDOT review of Submittal macdc.us
14A Update - MDOT Calculations • Map of Complete Drainage District macdc.us
14A Update - MDOT Calculations • Information that is required for the MDOT 14a Calculation Submittal • Per Drain Code, MDOT needs a minimum of 20 days before the Day Of Review. • Map of Drainage District • Areas of the Drainage District (Land Use Type) • Area of MDOT right-of-way in Drainage District • Drainage District runoff coefficient(s) • MDOT right-of-way runoff coefficient • MDOT review of Submittal macdc.us
14A Update - MDOT Calculations • Areas of the Drainage District macdc.us
14A Update - MDOT Calculations • Information that is required for the MDOT 14a Calculation Submittal • Per Drain Code, MDOT needs a minimum of 20 days before the Day Of Review. • Map of Drainage District • Area of Drainage District (Land Use Type) • Area of MDOT right-of-way in Drainage District • Drainage District runoff coefficient(s) • MDOT right-of-way runoff coefficient • MDOT review of Submittal macdc.us
14A Update - MDOT Calculations • Area of MDOT right-of-way in Drainage District macdc.us
14A Update - MDOT Calculations • Information that is required for the MDOT 14a Calculation Submittal • Per Drain Code, MDOT needs a minimum of 20 days before the Day Of Review. • Map of Drainage District • Area of Drainage District (Land Use Type) • Area of MDOT right-of-way in Drainage District • Drainage District runoff coefficient(s) • MDOT right-of-way runoff coefficient • MDOT review of Submittal macdc.us
14A Update - MDOT Calculations • Drainage District Runoff Coefficient • R 280.9 Tables - • Rule 9. – The tables referred to in these rules are set forth as follows : Table I Type of Surface Runoff Coefficient Concrete or Asphalt Pavement 0.8 - 0.9 Commercial and Industrial 0.7 - 0.9 Gravel Roadways and Shoulders 0.5 - 0.7 Residential - Urban 0.5 - 0.7 - Suburban 0.3 - 0.5 Undeveloped 0.1 - 0.3 Berms 0.1 - 0.3 Agricultural - Cultivated Fields 0.15 - 0.4 - Pastures 0.1 - 0.4 - Forested Areas 0.1 - 0.4 macdc.us
14A Update - MDOT Calculations • Information that is required for the MDOT 14a Calculation Submittal • Per Drain Code, MDOT needs a minimum of 20 days before the Day Of Review. • Map of Drainage District • Area of Drainage District (Land Use Type) • Area of MDOT right-of-way in Drainage District • Drainage District runoff coefficient(s) • MDOT right-of-way runoff coefficient • MDOT review of submittal macdc.us
14A Update - MDOT Calculations • Information that is required for the MDOT 14a Calculation Submittal • Per Drain Code, MDOT needs a minimum of 20 days before the Day Of Review. • Map of Drainage District • Area of Drainage District (Land Use Type) • Area of MDOT right-of-way in Drainage District • Drainage District runoff coefficient(s) • MDOT right-of-way runoff coefficient • MDOT review of submittal macdc.us
14A Update - MDOT Calculations • MDOT Review of Submittal • Utilize MDOT right of way plans to measure accurate widths within Drainage District macdc.us
14A Update - MDOT Calculations • MDOT Review of Submittal • Utilize MDOT asbuilt drawings in Drainage District macdc.us
14A Update - MDOT Calculations • MDOT Review of Submittal • Area of MDOT right of way in Drainage District macdc.us
14A Update - MDOT Calculations • MDOT Review of Submittal • Area of MDOT right of way in Drainage District macdc.us
14A Update - MDOT Calculations • MDOT Review of Submittal • Review of C factor and the 14A Calculation • Complete Independent Calculation macdc.us
14A Update - MDOT Calculations • MDOT Review of Submittal • Approval Letter from MDOT macdc.us
14A Update - MDOT Calculations • Why we use GIS • Automation • Mass data storage • Visual display of data • Efficient way to express ideas • Less Time = Less Expense macdc.us
14A Update - MDOT Calculations • DATA Sources • USGS – US Geological Survey • NRCS – Natural Resource Conservation Service • MiGDL – Michigan Geographic Data Library • Many Others macdc.us
14A Update - MDOT Calculations • Public DATA Sources • Transportation • PLSS – Township Sections, QQ Sections, Municipal Boundaries, Etc. • Aerial Photos • Streams, Rivers and Wetlands • Soils, Land Cover/Land Use, Topographic Data, Etc. macdc.us
14A Update - MDOT Calculations • Using GIS for 14A Calculations • Clip Transportation layers to Drainage District Boundary • Length and road type are attributes of the data set • Lengths are used to calculate pavement areas macdc.us
14A Update - MDOT Calculations • Aerial Photos • Measure Pavement Length and Width • Measure Berm Area • Estimate Land Cover for Runoff Coefficients macdc.us
Questions & Comments macdc.us
