Consumption Analysis
ADS Environmental Services can provide a detailed consumption analysis of the metered use of customers. This can determine the impact on water use and revenue of the current meter change-out program for 10-1nch, 8- inch, and 6-inch meters. This facilitates the selecting of 3- inch and 4-inch meters for testing and replacement. This service also could efficiently select 2-inch meters for the planned testing program.
The analysis also could identify the potential for reducing unaccounted-for water due to oversized meters, by considering the impact fees generated by demand charges. Meter replacement and payback periods can be determined for each meter size, based on actual projected usage, meter cost, water rates and meter reading method.
Strategies to minimize water loss are essential for cost control and proper management of limited water resources. ADS can provide skilled specialists to perform leak detection, leak quantification, and other services required for a complete audit of water loss. The cost of the program is often recovered through reduced water loss and increased revenues.
Master Planning
A master plan includes a prioritized list of proposed improvements and a master plan map. Proposed improvements are based on modeling results. ADS Pipeline Services' experienced engineers use the calibrated model to simulate critical future conditions. When the model predicts unsatisfactory performance with the existing system, improvements are designed on a trial basis.
The existing system is used to full advantage in all simulations. Accurate data from field measurements ensures that the model correctly simulates existing pipes and pumps. Maximizing use of the existing system minimizes the cost of improvements. Storage requirements are evaluated and various storage alternatives are investigated, including both elevated and ground storage. Modeling engineers check tank performance for future conditions. Redundancy and reliability are considered in the design of proposed improvements, as well as operational flexibility.
When deficiencies are identified, alternative methods of solving problems will be tried and compared. Economical solutions are identified, with consideration given to innovative solutions for the entire service area at build-out. The experience of ADS Pipeline engineers produces practical solutions that work in the real world. Proposed improvements will enable the system to meet design criteria for fire protection, service pressure, velocities, and pump and tank performance. The strategic plan prioritizes the improvements and includes cost estimates for each item. Operation and maintenance costs are included.
Measurements
Flow Measurements - ADS Environmental Services utilizes specialized equipment to measure pressured flow in water distribution systems. Flow measurements can be used to calculate flow capacity in water distribution systems, accurately measuring actual flow velocities and velocity profiles.
District Measurements - The distribution system is divided into districts to measure hourly rates of flow and 24-hour consumption patterns. By comparing the minimum rate of flow at night in a given area with its total consumption, a leakage potential for that area can be accessed.
District measurements can be used to determine diurnal curves for use in a computer model. Demand curves provide critical data for extended period simulations.
Hydraulic Grade Line Measurements - The purpose of the measurements is to determine hydraulic grade lines under various flow conditions, to determine how the water circulates through the trunk mains and to discover any other conditions pertinent to carrying capacity. This information is used to calibrate the model, to ensure that there are no closed or partially closed valves, and to develop reinforcements that fully utilize the existing system. The test consists of simultaneously recording system pressures and flows at a number of strategic locations.
Modeling
Hydraulic Modeling - ADS Environmental Services uses hydraulic models to analyze water distribution systems. Our engineers use a variety of commercially available software. Our engineers are also experienced with thoroughly documenting, installing and integrating the model on our clients' computer systems and training staff in its use.
ADS engineers also have experience in modeling water quality parameters such as travel time and chlorine decay. Models can be used to develop operational changes or flushing programs to improve water quality. Proposed improvements can be evaluated to determine their impact on water quality.
We have worked on over 500 network computer models in our history and within the past five years ADS Pipeline has conducted hydraulic modeling studies for over 30 communities.
Water Quality Modeling - Calibrated models are used to predict the concentration of a substance as it moves through the system and decays over time. The concentration at a node can be traced over time and graphically compared to measurements.
Leak Detection
ADS distribution system experts come from a long history of over 100 years in the leak detection business. Our leak detection/location surveys are conducted using sonic detection equipment. We survey the total length of water main and monitor the system by listening directly on all hydrants and on numerous valves and services with highly sensitive sound intensifying instruments. ADS utilizes the latest technology in electronic correlation equipment and our engineers are trained experts in their use.
In areas showing indications of leakage, a thorough investigation is conducted of the mains, hydrants, valves, and services with electronic leak correlation equipment. To pinpoint the leaks for repair, every attempt to further confirm the leak location will be made by using a ground microphone. Leak locations are marked with highly visible paint. ADS crews will record all defective system components such as valves, hydrants and curb stops, as well as any map errors that are noted in the course of carrying out other field activities.
ADS also offers automated leak detection technology. This includes audible leak detection hardware coupled with a data logger and a radio transmitter. Units are installed at multiple pipe locationswithin the water supply system and continually monitor for sounds characteristic of pipe leakage. When a unit detects a noise indicative of leakage, the built-in radio transmitter sends a signal to an above ground receiver. ADS’ survey team canvasses the survey area with the receiver to identify locations in which to return with a leak noise correlator for pinpointing or discounting potential leakage locations. This automated technology can significantly reduce the amount of time required to conduct the primary survey.
Click Here for additional information on Large Diameter Leak Detection services.
