The final construction plans for drainage within the development shall conform to the above provisions and to any special conditions as required by the Village of Cedarville in approving the tentative plans. Such construction plans for drainage shall be approved by the Village of Cedarville prior to construction of any drainage facilities within the development. A grading plan with minimum finish floor elevations shall be submitted along with the construction plans to identify the lot grading and in-tract drainage planned for the development. The final construction drawings shall contain the locations, widths, names of existing streets, railroad rights-of-way, easements, parks, permanent buildings, and corporation and township lines; location of wooded areas and other significant topographic and natural features within and adjacent to the development property for a minimum distance of two hundred (200) feet.
Type of Surface | C Factor |
Roof surface | 0.95 |
Bituminous or concrete pavement | 0.90 |
Gravel pavements | 0.70 |
Impervious soils | 0.65 |
Impervious soils with turf | 0.50 |
Slightly pervious soils | 0.40 |
Slightly pervious soils with turf | 0.30 |
The designer should investigate the capacity of the downstream drainage facilities to determine if they will be adequate to handle the design flow from this particular development. If the downstream facilities are inadequate, it may be necessary to provide on-site detention or retention basins to limit the flow to an amount which the downstream system can accept.
A site grading plan with minimum finish grade shall be required by the design engineer as a part of the construction plans. At a minimum, first floor elevations should be shown. If minimum basement elevations are stated in the plans, developer/owners must follow the plans or assume all risk. The grading plan shall show all intended direction of surface water flow.
All plans, calculations and design work need to be signed and stamped by a professional engineer. (Ord. 2021-08. Passed 12-13-21.)