Drainage

Flood Zones and Natural Hazards

2021Floodplain Development Permit

Common Plan SWPPP Checklist (1)

Commercial Stormwater Permit (PDF)

Centerville CGP SWPPP Checklist (1)

Residential Stormwater Permit (PDF)

Centerville City Flood Insurance Rate Map (PDF)

2021Stormwatermanagementplan

BMP Manual Davis County Stormwater Coalition (1)

What is the Storm Drainage Utility?

The Storm Drainage Utility has been established by the City to construct, operate, and maintain the City’s storm drain system, including subsurface drain facilities. The Storm Drainage Utility owns and operates all of the City’s storm and subsurface drain facilities and is charged with overseeing the maintenance and repair of approximately 1,413 manholes, 973 catch basins, 29.87 miles of storm drain, 18.22 miles of subdrain, 1.14 miles of culvert, 1.04 miles of swale, 5.49 miles of open ditches, and at least 133 outfalls (connections to the Davis County creeks). The Drainage Utility coordinates and supervises street sweeping and storm and subdrain cleaning throughout the City.  The Storm Drainage Utility is administered by the Drainage Utility Supervisor. The Drainage Utility also ensures compliance with State and Federal Stormwater Management requirements.

What is a Storm Drain and why do we need this infrastructure in the City?

Storm drains are a network of connected pipes and waterways that are used drain stormwater towards a waterbody. In Centerville, our stormwater ends up in the Great Salt Lake. Storm drains are needed to help quickly remove rain and snowmelt from impervious surfaces and to help prevent flooding and allow our roadways to remain safe during storm events.

What will the Drainage Utility Fees be used for?

All drainage utility fees collected by the City will be used exclusively for the creation, operation, planning, engineering, inspection, construction, repair, maintenance,  administration and other reasonable and customary expenses associated with the cost of service to provide drainage  services within the City.

Who is responsible for paying the Drainage Utility Fees?

Each owner of a developed parcel of real property in the City is required to pay the Drainage Utility Fees as set forth in the City Fee Schedule, which fees include a Storm Drainage Utility Fee and a Subsurface Drainage Utility Fee. 

What is an ESU? 

An Equivalent Service Unit or ESU, is the average amount of impervious surface, expressed in square feet, on developed single-family residential parcels in Centerville City. It has been determined that the average single-family residential parcel contains 3,600 square feet of impervious surface. Therefore one ESU is equal to 3,600 square feet of impervious surface. The ESU is used to determine the applicable  Storm Drainage Utility Fee for each developed property.

How is the Storm Drainage Utility Fee calculated?

Single-Family residential parcels pay a flat rate of $13.00 per month (1 ESU). All other developed parcels pay a fee based on the number of ESU’s on the parcel. One ESU equals 3,600 square feet of impervious surface. The number of ESU’s is calculated by measuring the amount of impervious surface on the parcel and dividing that number by 3,600. This number is multiplied by $13.00. For example, a parcel with 10,000 square feet of impervious surface area shall pay a fee of $36.01 per month (10,000 ÷ 3,600 = 2.77; then, 2.77 × $13.00 = $36.01).

What is “Impervious Surface”?

“Impervious Surface” means any hard surface area which either prevents or retards the absorption or entry of water into the soil mantle as it entered under natural conditions pre-existing to development, or any hard surface area which causes water to run off the surface in greater quantities or at an increased rate of flow from that present under natural conditions pre-existent to development. Common impervious surfaces include, but are not limited to: rooftops; concrete or asphalt paving; walkways; patios; decks; driveways; parking lots; storage areas; trafficked or compacted gravel; or other surfaces which similarly impede the natural infiltration into the ground or runoff of storm and surface water.

What is a “Developed Parcel”?

“Developed Parcel” means any parcel that has been altered from its natural condition by the construction of improvements or other impervious surface areas or by grading or filling of the ground surface area, which grading or filling affects the hydraulic properties of the parcel.

How was my property measured?

The amount of impervious surface on each developed non-single-family residential property is measured using aerial photography, measuring software, site plans on file with the City, and site visits.

What is a subdrain? 

A subdrain is a network of pipes that removes groundwater. These allow the water table to drop so that basements can stay dry. Subdrains also help keep the City’s roads and sidewalks free from groundwater, allowing them to last longer.

What is an EDU and where was this information obtained? 

“Equivalent Dwelling Unit” or EDU is based upon the number of plumbing fixture units per building, structure, and/or dwelling on a developed parcel. One EDU is defined as 20 fixture units as determined using the most recent edition of the Uniform Plumbing Code, as adopted by the City. Centerville obtains this information from the South Davis Sewer District. If you have a direct connection to the subdrain or it has been determined that your property has a direct benefit due to the subdrain, your property is part of the Subdrain District.

How is the Subdrain Drainage Utility Fee calculated?

Properties within the Subdrain District pay $12.72 per EDU/month. Properties outside of the Subdrain District pay $4.24 per EDU/month. Properties outside of the subdrain district are required to pay this fee because they still receive a benefit from the subdrain system, as it has a direct benefit to the roads and other infrastructure throughout the City. For example, a parcel within the Subdrain District with 4 EDU’s will pay $50.88 per month (4 X $12.72 = $50.88). A parcel outside of the Subdrain District with 4 EDU’s will pay $16.96 per month (4 x $4.24 = $16.96).