Douglas County requires a DESC (Drainage, Erosion, & Sediment Control) Plan at the very least for basically any freestanding structure which needs a permit, including barns, garages, ADU’s, and additions for houses.
Typically these types of structures have less than 1 acre of disturbance and so a DESC is typically required.
However, if you plan to disturb over 1.0 acre of land in Douglas County, than you need a GESC (Grading, Erosion, & Sediment Control) Plan. A GESC is a lot like a DESC but is more detailed and has more requirements.
List of main requirements for a DESC/GESC
- grading so that water flows away from buildings. 10% slope or 5% if sloped towards a swale. >1% slope for impervious surfaces (concrete, asphalt, pavers, etc.)
- perimeter silt fencing OR straw logs
- vehicle tracking control near entrance – clean truck tires prior to leaving site
- seeding/mulching schedule
- all slopes 3:1 or steeper require erosion control matting
- culvert sizing/calculations
- driveway slopes must be <10%
- show easements, setbacks, 2′ contours (topographic survey is typically required in addition to the plat).
- show proposed contours, slopes, and spot elevations.
- distance of proposed building to all property lines and adjacent structures
- Show fire truck turnaround and meet all other douglas county driveway regulations and Fire Code requirements.
- Show top and bottom of retaining walls with spot elevations. Retaining walls 4′ in height or greater require engineered retaining walls plans.
Contact XYZ Civil, LLC (www.xyzcivil.com) for assistance with this.
email: jeff@xyzcivil.com
phone: 720-648-6136