CITY OF ANAHEIM
SEWER DESIGN MANUAL
Sanitary sewers are designed primarily to carry to a satisfactory point of treatment and ultimate disposal the spent water supply of a community, industrial wastes and unavoidable amounts of ground water infiltration. All waters not containing impurities which are actually or potentially objectionable should be excluded as far as possible from the sanitary sewer system. The flow rates of sewage for which sewer capacity should be provided must be determined from careful considerations of the present and probable future quantities of domestic sewage and commercial and industrial wastes.
Sewer shall be located in the street, not in the parkway. sewer trench shall not extend under edge of gutter.
A minimum radius of 150' shall be used for any horizontal bend. Maximum deflection at any joint shall not exceed two (2) degrees.
When jacking is required, details to be shown on plans. 18" minimum diameter C.I.P. with 3/8" wall thickness required for 8" V.C.P. Jacking may be required by the City Engineer when crossing arterial highways.
Minimum horizontal spacing between sewer line and water line is 11'.
Provide lateral for each lot per Standard Detail No's. 222 and 223.
Sewer shall be normally 7' to 8' deep (to soffit of pipe). Mainline minimum depth at manhole shall be 5.67 ft (5'- 8").
Avoid vertical curves. Straight grade from manhole to manhole. Use of vertical curve to be approved by the Development Services Manager.
Elevation drop thru manhole:
Avoid drop manholes. Use of drop manholes to be approved by the Development Services Manager.
Encasement is required when clearance between pipe is less than 18" and where required separation with water line can not be maintained per Standard Detail W-130.
Encasement sewer line per Standard Detail No. 225 and when:
Top of bell of sewer is less than 3' from bottom of water line,
Since the quantity of domestic sewage is a function of the population and of water consumption, lateral and submain sewers should be designed for the saturation density of population expected in the areas served. The sewer system should be designed for tributary areas, land use and population estimated to prevail at least 25 to 50 years in the future.
All sewers shall be designed based on the peak flow rate and the following criteria.
A minimum pipe size of 8" shall be used for all public sewers and private sewers within street.
The average daily flow of sewage and ground water is the average 24 hour discharge during a period of a year. The peak flow determines the hydraulic capacity of sewers.
Single family residential:
Peak factor: 2.0
Lot coverage varies from 40 to 70% depending upon location.
Peak factor: 2.0
R.C.P., A.C.P., V.C.P., A.B.S., D.I.P. 0.013
From 8" to 12" 1/2 D
Main line sewer pipe shall be V.C.P.
Sewer pipe under median to be D.I.P. epoxy lined, polylined D.I.P. or V.C.P. encased.
V.C.P. And D.I.P. - Use City Standard Detail No. 319 for cover between 3' and 15', for cover less than 3' and greater than 15' special bedding is required. Calculations and supporting soils reports to be provided by the Design Engineer. Use a soil weight of 130 lbs/cf (unless soils reports state otherwise) and a safety factor of 1.5. Details of bedding shall be shown on plan.
Manholes to be constructed at intersecting mains, B.C., E.C., angle points and change in pipe size or grade. Only one manhole at BC or EC is acceptable if a short length curve with central angle less than 45 degrees (Maximum length is ).
Maximum manhole spacing is 300'.
When necessary to construct sewer line at depth of less than 4.5', use 5' diameter manhole with 3' diameter manhole cover A.F.C. A- 1251.
When sewer can not be located within the street, it shall be located in an approved easement.
Easements parallel to lot line shall be on one lot only.
Sewer easement shall be a minimum 15 ft. in width. For deep pipe the easement shall be 2 x depth - O.D. to a maximum 25 ft.
Easement parallel to lot line shall be on one lot only.
Access for maintenance to be 12' wide and must be paved with 0.25' of A.C. over 0.35' of B.M.. Location of access to be approved by the Maintenance Department.
Easement for public sewers shall be dedicated to the City on a recorded map or by a separate deed with the approved easement sketch and the legal description (including closure calculations).
Sewers may be drawn in plan view only, however they must show rates of grade, direction of flow, size of pipe, invert and finish surface elevations at cleanouts, manholes and grade breaks, location and elevation of all adjacent or crossing underground facilities, sufficient horizontal controls to permit the system to be located in the field, and any other information which may be required to adequately check, construct and inspect the system.
a. Residential development: 6" min.
b. Industrial development : 4" min.
4" min. when serving 1 thru 6 living units in a single building,
B. Cleanouts may be provided in lieu of manholes at a maximum spacing of 100 feet.
Standard manholes may be required when deemed necessary by the City Engineer.
APPROVED ONLY FOR INSPECTION OF WORKMANSHIP AND MATERIALS
ON PRIVATE PROPERTY
D. Private sewers designed to meet the Plumbing Code may be reviewed and inspected