ce 3372 water systems design lecture 006: introduction to us epa-net
TRANSCRIPT
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CE 3372 Water Systems DesignLecture 006: Introduction to US EPA-NET
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EPANET Introduction/Workshop Example problems
Network Design Principles Introduction to Project
Outline
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Install Example 1 – Flow between two reservoirs Example 2 – Three reservoir (branched) Example 3 – Two reservoir, 4 pipes (loop) Example 4 – Lifting with a pump
Workshop
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Sketch a layout on paper Identify pipe diameters; length; roughness
values Identify node elevations; demands Supply reservoir (or tank); identify reservoir
pool elevation Identify pumps; pump curve in problem units
Model Preparation
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Example 2 – Flow between two reservoirsExample 1
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Example 2 – Three reservoir (branched)Example 2
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Example 3 – Two reservoir, 4 pipes (loop)Example 3
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Example 4 – Lifting with a pumpExample 4
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Water Supply System Includes water supply Treatment Facilities Pumping facilities Transmission lines Local distribution network
Network Design Principles
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Distribution network - Consists of items designed to convey potable water at adequate pressures and discharges Pipes Fittings Valves Other appurtenances
Water Supply system
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Who? Personnel within the water company Engineers / Consultants
Design parameters and regulations? State board of health Local city/county health departments EPA, AWWA, ANSI
DESIGN
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Pressure
Velocity
Age
Chlorine concentration
Fire Flow
DESIGN REQUIREMENTS
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Pressures Must be high enough to..
overcome head losses in the system. But not too high to...
prevent damage to fittings and other appurtenances.
Pressure Zones – Set pressurized areas (min and max) within the system by storage, boosters, or pressure control valves. Can also be due to varying pipe size and topography May be generated to ensure reliability in meeting fluctuation demands.
System pressures are adapted to requirements. Hilly areas – booster pumping Minimum pressures vary state to state Established by the state’s Health Department / other agency Fire Marshall may establish additional requirements.
Pressure
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Fire Flow Parameters Each municipality establishes own parameters based on local cond. Insurance Services Offices (ISO) - Most used
“Guide for Determination of Required Fire Flow” Recommends criteria for
Establishing insurance rates Classifying mun. with reference to their fire defenses and physical cond.
Q = required fire flow in gpmC = coefficient related to the type of constructionA = total floor area in ft2 (excludes basements)
Fire flow
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Hydraulic Characteristics Pressures and discharges are a functions of HC Length Size Condition of pipe
Service Characteristics Demand as it relates to:
Present and projected population Economic base Fire flow Climate
Water supply system
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Water utility company …who is responsible for the water quality and
operation of the distribution system.
Companies exist in two forms public entity that
..“exists for the health, safety, and welfare of the public” privately owned utility that ..provides water for profit
WATER utility
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Water supply system Gravity
Dependable Source of supply must be located well above the city High-pressure demand for fire-fighting may require pumper
trucks
Pump Least Desirable Pressures vary substantially with variations in flow Provides no reserve if power failure
Pump with Storage Most common Water supplied at approximately uniform rate Flow in excess of consumption stored in elevated tanks
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Pipe System
Primary Mains (Arterial Mains) Form basic structure of the system Carry flow from pumping station to elevated
storage tanks Carry flow from elevated storage tanks to
service areas Laid out in interlocking loops Mains not more than 1 km (3000 ft) apart
Valved at intervals of not more than 1.5 km (1 mile) Smaller lines connecting to them are valved
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Pipe System
Secondary Lines Form smaller loops within the primary main
system Run from one primary line to another
Spacings of 2 to 4 blocks Provide large amounts of water for fire fighting
with out excessive pressure loss
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Pipe System
Small distribution lines Form a grid over the entire service area Supply water to every user and fire hydrants –
Connected to primary, secondary, or other small mains at both ends Valved so the system can be shut down for repairs Size may be dictated by fire flow except in residential
areas with very large lots
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Water source (Main Supply)• Lake• River• Aquifer
Treatment Facility• Treats and disinfects water• Meet water quality standards• Potable water
Transmission Lines• Convey water from
source – treatment facility facility – network
Pumping Facilities• Provide energy to
move water
Intermediate Storage Facilities• Stabilize line
pressures• Reserve for
peak demand periods
• Provide storage for fire flow req.
Distribution Lines• Convey water from
storage – service areas• Looped(grid) and Branched
Layouts
Appurtenances• Fire Hydrants.
Valves, auxiliary pumps, fittings
Water SUPPLY system
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Water Use Systems
Spatial and temporal distribution in support of human habitation Water supply/treatment/distribution Waste water collection/treatment/discharge
Capacity is based on POPULATION served hydraulic dominated designs
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Water Use AND DEMAND
Water Use Consumptive
Municipal Agricultural Industrial Mining
Non-consumptive Hydropower Transportation Recreation
Water Demand Quantity that consumers use per unit of time Ex: Mgpd Depends on population, climate, industry and economic factors
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Water DEMAND Residential
Single-family, multi-family (apartments) Water for drinking, landscape, swimming, fires, street
cleaning, etc. Usually two demand peaks (morning and evening)
Commercial Motels, hotels, offices, shopping centers Usually less peak demand and less varied than
residential
Industrial Chemical plants, food processing plants, mines Water for fabrication, cooling, petroleum refining, etc. Water use depends on type of industr.
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Assigning Demand
Assign demand using network models (links and nodes)
Network models contain nodes that represent a multitude of actual connections.
While conceptually possible to model to every single connection,it is discouraged because Model is hard to maintain Small errors may go unnoticed The operation of any single connection is not well known.
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Network Types
Branch No circulation Has terminals and dead-ends
Water in dead-ends is stagnant Disinfection residual Corrosion
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Network Types
Grid/Loop Furnishes supply from more than one direction
Water circulates Disinfection is more effective. Water “age” in system is younger (fresher).
In case of water main break, fewer people are inconvenienced
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Network Types Loop vs. Branch during network failure
Every link in a branch system is a single point of failure that isolates all downstream nodes.
Not with loop, only main supply line is failed
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Semester design project is to conceptual design a water distribution system and a storm water sewer system for a small residential development Hydraulic analysis for both systems to
demonstrate that the systems will supply/convey as sufficient capacity
Project
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Demand estimation is used to determine how much water a system is likely to use (for sizing reservoirs and tanks
Flow rate estimation (a plumber’s perspective) is used to determine how much capacity a system should be able to provide
Estimating Flow Rate
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How Much Water Can You Actually Get? Flow Rates are measured in gallons per minute (gpm). For our purposes, we will talk about the amount of
water that you can get through a pipe at a velocity of 8 feet per second (a standard velocity used to engineer a plumbing system).
Plumbing diameter will limit the flow rate you can get – the larger the pipe, the more water you can get. A home with 1″ plumbing can use substantially more water than a home with 3/4″ plumbing.
How Much Water ?
Meter to house
Inside home
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1. Think about the maximum number of fixtures and appliances you might operate at the same time.
2. Look at the chart to see how many gallons per minute each device requires.
3. Add up the flow rates for all the devices you selected.
You just figured out the PEAK FLOW RATE that you need.
Now, think about your continual water use, or water use that may run for more than 10 minutes. Add up the fixtures again, and you just calculated your SERVICE FLOW RATE.
How Much Needed? (1)
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http://extension.psu.edu/natural-resources/water/drinking-water/best-practices/water-system-planning-estimating-water-use
How Much Needed? (2)
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Estimate need per connection to size the system; Run a hydraulic model at these values to size
pipes Estimate demand to evaluate how the
system is likely to perform in terms of pressure zones and such Run a hydraulic model at these values to check
pressures – no fire flow Run a hydraulic model with fire flow to check
minimum pressures
Using the estimate
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Several readings on server will be useful:
Readings
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Pumps Review how to size How to simulate in EPANET NPSH considerations
Next Time