5-8 Separation from Stormwater and Wastewater Mains. 5-6 Hazen Williams roughness coefficient. 5-2 Average Water Demand (light industrial and commercial). 4-2 Section 5 Design of Water Distribution System. 4-1 Minimum redundancy – Drinking Water systems. 4-1 Minimum redundancy – Wastewater systems. 3-1 Other Design & Construction Standards. 1-1 Section 2 Design Approach & Approvals. i October 2008 R1 Water And Sewerage Authority (WASA) Water and Wastewater Design Guideline Manual Table of Contents Table of Contents Table of Contents List of Abbreviations Section 1 General Information. In a new section 6.2, requirements for impoundment reservoirs were added In section 5.1 and 10.1, requirements for trenchless technologies were added In a new section XX, criteria for As build and drawing standards were added. In section 6.6 7.11 12.16 14.10, the height of fences have been reviewed to 2.1 m. In section 5.7.2, a new polyurethane coating section was added. In section 5.6.2, the required specification for PVC pipe was changed. In section 5.2.5.3, the minimum duration criteria for fire has been changed to one hour. Water And Sewerage Authority (WASA) Of Trinidad and Tobago Water and Wastewater Design Guideline Manual Revision 1 – October 2008 Water And Sewerage Authority (WASA) Water and Wastewater Design Guideline Manual Table of Contents Major elements of revision no 1 – October 2008 : In section 3.1, a minimum flood level requirement has been added.
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