- The objective of the Water and Sewer Design Manual is to promote uniformity in the presentation of Plans by establishing a general format and outlining detailed information which is required for the preparation of complete water and sewer contract drawings. This combination, in conjunction with a high standard of professional drafting technique, will preclude, to the greatest extent possible, any unnecessary work in the preparation of the plans. It will also assist the designer in avoiding errors and omissions which could consequently require extensive alterations and corrections.
- The accuracy and completeness of all drawings will enable the Consultant to submit a sound equitable bid for the project and reduce the potential construction conflicts.
- It is the intent of this manual to give guidance for the orderly preparation of final construction plans. The methods, procedures and examples are to be followed so as to promote consistency in the preparation of Plans. This manual may be used as a general guideline only. Engineers and design professionals should not solely rely on these guidelines, but must always use their professional judgment in the development of plans and specifications. This manual is not intended nor should it be used in substitution for the judgment of engineering and design professionals. It remains the sole responsibility of the design professional to develop plans which are consistent with all laws and regulations and which are based on sound engineering judgment. Compliance with the guidelines contained in this manual does not assure design acceptance by the Water Department. The Water Department will exercise its best professional judgment, on a case by case basis, in its review of each design application.
- The Engineer will be required to perform a field visit of each project site to obtain the physical features as well as acquaint himself/herself with any unusual requirements of the location which may be important in the preparation of the design or specifications for the project.
- This document supersedes any previous Water and/or Sewer Design Manuals. In order to provide an overview of the various design steps and the order in which they are performed, enclosed with this document is a project flow chart (see Appendix Ia [1]). The flow chart schematically represents the general process of projects from initiation to completion, for both water & sewer projects.
- In order to provide a reference of the type of construction of sewers done at the turn of the century, a copy of the 1907 Sewer Standard Details is included in Appendix Vf [2]. These details should be used as a reference to further understand the existing sewer system. These details do not purport to accurately describe or show the exact configuration of any specific sewer, but rather to demonstrate the type of construction used at the time of the construction of many of the sewers we are presently replacing.
- All illustrations of lettering, line weight, etc. shown in the appendices and sample drawings are to be used as a template for CAD drawings. All drawings by consultants shall be prepared on a CAD system and all files shall be submitted electronically along with Mylar type prints to the Water Department upon design completion.
PWD Water & Sewer Design Manual
Introduction (v.4.0)