Identify runoff calculation method. Identify design storm recurrence intervals. Identify detention discharge and storage calculation method. Drainage Facility Design General Concept – Discussion of compliance with offsite runoff considerations. Discussion of anticipated and proposed drainage patterns. Discussion of the content of tables, charts, figures, plates or drawings presented in the report. Drainage Facility Design Specific Details – Presentation of existing and proposed hydrologic conditions including approximate flow rates entering and exiting the subdivision with all necessary calculations. Presentation of approach to accommodate drainage impacts on existing or proposed improvements and facilities. Presentation of proposed facilities with respect to alignment, material and structure type. Discussion of drainage impact of site constraints such as streets, utilities, existing and proposed structures. Environmental features and issues shall be presented if applicable. Discussion of maintenance access and aspects of the preliminary design. Discussion and analysis of existing and proposed downstream drainage facilities and their ability to convey developed runoff from the proposed development. Drawing Contents General Location Map: A map shall be provided in sufficient detail to identify drainage flows entering and leaving the development and general drainage patterns. The map should be at a scale of to 1”=50’ 1”=2000’. The map shall identify any major construction (i.e. development, irrigation ditches, existing detention facilities, culverts, storm sewers, etc.) that shall influence or be influenced by the subdivision. Drainage Plan: Map(s) of the proposed development at a scale of 1”=20’ to shall be included to identify existing and proposed conditions on 1”=200’ or adjacent to the site in question. The drainage plan shall delineate all sub-basins and proposed initial and major facilities as well as provide a summary of all initial and major flow rates at design points. All floodplains affecting the site shall be shown. County Grading and Erosion Control Plan Submittal Checklist Vicinity map. North arrow and acceptable scale to (1”=20’ 1”=100’). Existing and proposed Contours 2 feet or less (except for hillside). Standard EPC Grading and Erosion Control Notes included. Delineate mapped FEMA 100-yr floodplain. Construction site boundaries clearly delineated. Areas of soil disturbance shown. All proposed construction BMPs and Construction BMP details shown.
Identify runoff calculation method. Identify design storm recurrence intervals. Identify detention discharge and storage calculation method. Drainage Facility Design – General Concept Discussion of compliance with offsite runoff considerations. Discussion of anticipated and proposed drainage patterns. Discussion of the content of tables, charts, figures, plates or drawings presented in the report. Drainage Facility Design – Specific Details Presentation of existing and proposed hydrologic conditions including approximate flow rates entering and exiting the subdivision with all necessary calculations. Presentation of approach to accommodate drainage impacts on existing or proposed improvements and facilities. Presentation of proposed facilities with respect to alignment, material and structure type. Discussion of drainage impact of site constraints such as streets, utilities, existing and proposed structures. Environmental features and issues shall be presented if applicable. Discussion of maintenance access and aspects of the preliminary design. Discussion and analysis of existing and proposed downstream drainage facilities and their ability to convey developed runoff from the proposed development. Drawing Contents General Location Map: A map shall be provided in sufficient detail to identify drainage flows entering and leaving the development and general drainage patterns. The map should be at a scale of 1”=50’ to 1”=2000’. The map shall identify any major construction (i.e. development, irrigation ditches, existing detention facilities, culverts, storm sewers, etc.) that shall influence or be influenced by the subdivision. Drainage Plan: Map(s) of the proposed development at a scale of 1”=20’ to 1”=200’ shall be included to identify existing and proposed conditions on or adjacent to the site in question. The drainage plan shall delineate all sub-basins and proposed initial and major facilities as well as provide a summary of all initial and major flow rates at design points. All floodplains affecting the site shall be shown. County Grading and Erosion Control Plan Submittal Checklist Vicinity map. North arrow and acceptable scale (1”=20’ to 1”=100’). Existing and proposed Contours 2 feet or less (except for hillside). Standard EPC Grading and Erosion Control Notes included. Delineate mapped FEMA 100-yr floodplain. Construction site boundaries clearly delineated. Areas of soil disturbance shown. All proposed construction BMPs and Construction BMP details shown.
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