HYDRAULIC ANALYSIS REPORT

INTRODUCTION

This is a summary of the report presented to the City of Hattiesburg. The full report is available upon request from either the Department of Public Works or Shows, Dearman, & Waits.

The hydraulic analysis report summarizes the results of a hydraulic analysis of the water system owned and operated by the City of Hattiesburg. The report will show the existing configuration of the water distribution system, the current status of the system in regards to, domestic use, fire flow and water aging, and proposed improvements required to meet the current Mississippi Department of Health or other applicable guidelines.

LINES:

The following is an approximation of the lengths of distribution lines maintained by the City of Hattiesburg. The line sizes, lengths, locations and other pertinent information was taken from maps supplied by the City of Hattiesburg. Lines less than 4 inches in diameter were not considered in preparation of this report.

METHODOLOGY

A computer PC-based program was used to model the hydraulics of the existing and proposed improvements for the City of Hattiesburg. The Kentucky Woods or as currently recognized PIPE2000 Program was developed to calculate steady state flows and pressures for the pipe distribution system. The program can be applied to any liquid, but does not generally apply to gas flow unless the assumption of constant density is acceptable. The program is written to accommodate any piping configuration and various hydraulic components such as pumps, valves (including check valves and regulating valves), any component or fitting which produces significant head loss (such as elbows, orifices, etc.), flow meters and storage tanks. Computations can be carried out using both English and SI units.

Normal pipe network modeling involves the calculation of the flow in each pipe and the pressure at each node for a particular operating condition. In addition to carrying out these calculations, PIPE2000 has been enhanced to directly calculate a variety of additional design, operation and calibration parameters which will exactly meet stated pressure requirements. This powerful, state of the art capability, greatly increases the usefulness of PIPE2000 as a pipe network modeling tool by eliminating the trial and error procedure normally associated with such calculations.

PIPE2000 is based on solving the full set of mass continuity and energy equations utilizing efficient linearization schemes to handle non linear terms and a very powerful spare matrix routine developed by A. R. Curtis and J. K. Reid of the Theoretical Physics Division, UKAEA Research Group, Harwell, England. This approach accommodates elements such as closed lines, check valves, and regulating valves in a direct and very efficient manner. The approach also effectively handles data with widely varying parameter values. Extensive testing of various algorithms for pipe network analysis led to the conclusions that the approach used by PIPE2000 is the most powerful and has the best convergence characteristic of the commonly used approaches.

WATER CONSUMPTION

The City of Hattiesburg consumes approximately 11.0 million gallons of water on an average daily use cycle. The maximum daily use of water is approximately 20.0 million gallons of water during peak usage. The peak usage is in the high demand summer months when outdoor activities such as gardening, lawn watering, swimming pools, etc. are in high use. The City of Hattiesburg experiences a loss of water during day to day operations. This loss of water varies between 5% and 15% per day. The loss of water is defined as water pumped, treated and supplied for use, but unmetered. The loss of water can occur from various unmetered sources including line breakage, hydrant flushing, fire protection, filter cleaning at the plants or other sources. Production of water with treatment which involves mechanical and chemical treatment is a source of revenue for the water department. The unmetered water is income which could be used by the City of Hattiesburg. Unmetered water should be kept to a minimum.

By agreeing to provide public facilities to all entities located within the city limits, the City of Hattiesburg is required to furnish potable water to the small residential user and the large corporate user. Large consumers use water in day to day operations and require plentiful and reliable water to continue operation.

WATER QUALITY

The Mississippi Department of Health (MSDH) currently regulates the water quality for all public water supplies in the state. These regulations encompass many facets of water quality. The MSDH samples the water from different locations throughout the system at different times of the year. These samples are field tested or sent to Jackson to the MSDH Environmental Laboratory for analysis. From the information provided to Shows, Dearman & Waits, Inc. during preparation of this report, no adverse water quality samples have been present in the City of Hattiesburg water system.

CONCLUSIONS

The City of Hattiesburg currently has adequate service to all areas except for fire protection in the Palmers Crossing area. The Palmer's Crossing area requires upgrade of the feeder system into the community to provide adequate fire protection service. The area around the Hattiesburg Country Club is served by a booster which will supply adequate domestic flow. The Timberton area along Veterans Boulevard should be supplied with an additional water source.