| AWWA Comment Period on ANSI/AWWA D107-16, Composite Elevated Tanks for Water Storage
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AWWA Comment Period on ANSI/AWWA D107-16, Composite Elevated Tanks for Water Storage

AWWA solicits public comments on all proposed new AWWA Standards, and on all proposed revisions, reaffirmations, or withdrawals of existing AWWA Standards. The referenced standards project is being considered for approval and the publication of this notice begins AWWA’s 30-day public comment period. An electronic public review copy of the proposed standard can be purchased for review during the comment period for $20 each. Comments must be submitted in writing to the AWWA contact listed below no later than the last day of the comment period specified herein. Such comments shall be specific to the section(s) of the standard under review and include sufficient detail so as to enable the reader to understand the commenter's position, concerns and suggested alternative language, if appropriate. The AWWA Comment Period is now closed. Review copies are no longer available.

Send comments to:
Frank Kurtz
303.347.6221 phone
303.795.7603 fax

The review copy will be edited for publication and may also be revised as appropriate based on any comments received during the public comment period. Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.

Final publication of the standard may take several months. When it is available, a notice will be published in the official notice section of Journal – American Water Works Association. The standard becomes an effective AWWA standard on the first day of the month following such publication in Journal – American Water Works Association.

SCOPE
This standard describes the design, construction, inspection, and testing of composite elevated tanks that use a welded steel tank for watertight containment and a single pedestal concrete support structure. Requirements for the steel tank, concrete support structure, foundation, and accessories are included. Site selection and procurement; tank sizing; postcommissioning inspection and maintenance; and the design, operation, and control of the water distribution system that connects to the composite elevated tank are beyond the scope of this standard.

MAJOR REVISIONS
The major revisions in this edition of the standard include the following:
1. The notation and definition for maximum considered earthquake MCER have been revised to conform to the latest edition of ASCE 7.
2. Seismic maps are now cited by reference to ASCE 7-10 rather than being incorporated into the standard.
3. Table 3 on Site Classifications has been moved to Appendix A and has been renumbered as Table A.2.
4. Standard Sec. 4.2.7.8 and Appendix Sec. A.4.2.7.8 on Seismic Design Category has been added.
5. ASCE 7-10 wind provisions have been incorporated into the standard.
6. The gust effect factor Gf has been revised.
7. The wind map (Figure 2 of the 2010 edition) has been deleted and is now incorporated by reference to ASCE 7-10.
8. Tables 2a and 2b on design wind pressure have been revised and moved to Appendix A as Tables A.1a and A.1b.
9. Table 14 minimum safety factors have been revised. ASTM D4945 has been added to the dynamic testing provisions.
10. Standard Sec. 6.3.3.8.1 and Appendix Sec. A.6.3.3.8.1 has been updated to reflect current practice, similar to the provisions described in ACI 371R-08.
11. Appendix Sec. A.2 has been added to identify specific revision years for ASCE 7 and ACI 318.
12. Determination of meridional compression strength FL by Method 2 (D107-10 Sec. 5.3.5.3) has been eliminated. Method 3 in D107-10 has been renamed as Method 2 in this edition. Section numbers have been revised accordingly.
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