Idot drainage manual

(B) Time of concentrations may be determined as described in either TR or the IDOT drainage manual. Lag time if utilized may be assumed to be equal to times the time of concentration. (C) The selected curve numbers or other runoff coefficients must be calibrated to surveys of existing flood frequencies in other local watersheds which. DRAINAGE DESIGN Chapter 38 presents drainage design criteria specifically for local agency projects. For information on design procedures, the designer should reference the IDOT Drainage Manual. In addition, the Illinois Drainage Code (42 ILCS) provides the laws relative to rights of drainage, asFile Size: 63KB. a. Use Chapter 19 of this manual, Hydrologic Design, to determine design storm and hydrologic method of determining peak inflows— year design storm of most critical duration. b. Detention basin sizing shall follow the methodology in IDOT Drainage Manual or Pond Pack™ software. c. Outflow shall be limited to cfs/acre.

1. IDOT Drainage Manual, latest edition. 2. City of Champaign Stormwater Management Regulation, latest edition. B. Design: 1. General: a. Use Chapter 19 of this Manual - Hydrologic Design, to determine design storm and hydrologic method of determining peak flows. Culvert sizing shall follow the methodology in IDOT Drainage Manual. b. The proposed project has been reviewed in accordance with Executive Order "Floodplain Management"; Section (d) "Assessment and Documentation of Floodplain Encroachments" as contained in the Illinois Department of Transportation, Bureau of Design and Environment Manual; Drainage Manual; and 17 Illinois Administration Code CONCRETE PIPE USE MANUAL STORM SEWERS CULVERTS ASTM C Reinforced Concrete D-Load Culvert, Storm Drain, and Sewer Pipe C pipe is used for sizes 12 in. through in. diameter designed for a specific D-load strength. Joints provided for most culvert and drainage employ cement mortar or mastic compound. The.

IDOT DRAINAGE MANUAL. The “Drainage Manual” published by IDOT, Bureau of Design, most recent edition. ILLINOIS PLAT ACT. Act of Chapter of the Illinois Compiled Statutes, which regulates the division of land in the State, unless superseded by a local government. ILLINOIS URBAN MANUAL. This term shall mean “A Technical Manual designed for. Rainfall Drainage Manual Chapter 4 – Hydrology. RUNOFF COEFFICIENTS. VALUES OF C - Runoff RUNOFF COEFFICIENT. C. The Iowa DOT requires computerized modeling design using Geopak Drainage. Design in Geopak Drainage is desired for many reasons including: • Uniform use of design drainage library components. • Facilitation of running and evaluating alternate design storms, scenarios, and criteria. • Evaluation of flow regimes.