Utah Administrative Code
Topic - Environmental Quality
Title R317 - Water Quality
Rule R317-401 - Graywater Systems
Section R317-401-7 - Construction and Installation of Branched Drain Basin Systems
Universal Citation: UT Admin Code R 317-401-7
Current through Bulletin 2024-06, March 15, 2024
7.1. Branched Drain Basin Construction Details.
(a) Mulch shields shall be
constructed of a durable material and should be placed for optimum effluent
distribution.
(b) Aggregate shall
be placed in the basin in a manner that will allow proper effluent
distribution, prevent ponding, with a minimum depth of 6 inches over graywater
flood level, and as required in Table 6.
(c) Backfill may not be placed over the mulch
shields or flow splitters until after inspection and approval by the regulatory
authority.
(d) Access to any flow
splitter or mulch shield shall be within 6 inches of finished grade.
(e) Branched drain basins shall be
constructed in accordance with Table 8 and Table 9.
TABLE 8
Mulch Basin Sizing
|
Soil Type |
Mulch Basin Loading Rate, gallons of graywater per day per square foot |
Maximum gallons per mulch shield per day(a) |
|
Sand |
5 |
60 |
|
Loam |
3 |
40 |
|
Clay |
1 |
20 |
(a)
The number of gallons per mulch shield per day is site specific an d the
designer may need to decrease the number of gallons per mulch shield when
appropriate or as required by the regulatory authority.
TABLE 9
Mulch Basin Construction Details
|
Description |
Minimum |
Maximum |
|
Cleanouts |
1 |
--- |
|
3-way Valve or similar (per stub out location) |
1 |
--- |
|
Discharge Points (per stub-out location) |
2 |
16 |
|
Double Ell Flow Splitter |
1 |
--- |
|
Pipe Diameter |
2 inch |
4 inch |
|
Pipe Slope |
1/4 inch per foot |
--- |
|
Mulch Shield Volume |
5 gallons |
--- |
|
Air gap in mulch shield above highest perforation |
6 inches |
--- |
7.2. Construction, Inspection and Testing.
(a) Installation shall conform to the
equipment and installation methods described in the approved plans.
(b) Any surge tank shall be filled with water
to the overflow line prior to and during construction inspection. All seams and
joints shall be left exposed and the tank shall remain watertight.
(c) The irrigation system shall be installed
in the area which has soils similar to the soils which have been evaluated, and
has an absorption rate corresponding to the given soil
classification.
(d) A graywater
stub-out may be allowed for future construction, provided it is capped prior to
connection to the installed irrigation lines and landscaping. Any stub-out
shall be permanently marked: GRAYWATER STUB-OUT, DANGER UNSAFE WATER.
(e) A flow test shall be performed throughout
the system, from surge tank to the point of graywater discharge. All lines and
components shall be watertight.
(f)
Written operation and maintenance procedures including checklist and
maintenance instructions from the designer shall be provided to the owner prior
to the regulatory authority issuing written approval or
authorization.
(g) The installed
graywater system shall be operated only after receiving a written approval or
authorization from the regulatory authority after the regulatory authority has
made the final construction inspection.
Disclaimer: These regulations may not be the most recent version. Utah may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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