The main supply line usually runs to the water heater, where it divides into cold and hot water pipes. From there, supply pipes almost always travel in pairs, hot and cold. Pipes from the water heater are typically 3/4 inch but may be 1/2 inch. Horizontal pairs run below walls and then vertical pairs, called risers, run up to the various rooms.

• Building Water Supply System Design
• Residential Water Supply Design
• Home Water Supply System Design
• Water Supply Design Pdf

• There are two general methods of supplying a building with water, one known as the 'direct supply' system, and the other as the 'indirect' or 'tank' system. In the direct system each fixture is connected with the supply pipe and is under the same pressure as the street main, unless a reducing valve is introduced. This system is not always desirable, as the street pressure in many places is likely to vary, especially where the water is pumped into the mains.
• 2 days ago  The Delhi Jal Board (DJB) will establish a state-of-the-art, real-time monitoring system for ensuring Delhi’s water supply as well as the proper functioning of ‘Water Treatment Plant’ (WTPs.

Having a sink and water supply are critical for any RV.

It’s becoming more popular than ever to do customized conversions of vans or completely renovate old motorhomes in order to create the RV of your dreams. While this certainly allows you to build an RV perfectly suited to your wants and needs, it also comes with a lot of choices. For instance, what sort of water supply and sink system will you install in your rig?

There are several options to choose from, all of which have different advantages and disadvantages. Luckily, I recently decided to upgrade the water supply and sink in my class B van, so I’ve done all the research for you.

In this guide, we’ll go over the pros, cons, and product recommendations for:

• City water hookups
• Electric pumps
• Hand pump
• Foot pumps

I’ll also walk you through the system overview of each, so by the end of the article, you’ll have a pretty good idea of what’s involved for upgrading your RV’s sink and water supply.

Things to Consider Before Choosing a Water Supply System for Your RV

Whether it’s a pop-up camper or a giant motorhome, any brand new RV will have a water supply and sink already installed. As such, this guide is more for someone who is doing a thorough renovation of their RV or is researching upgrades to their current system.

This city water hookup and freshwater connection are both outdated. There are a few options for upgrading both systems.

Building Water Supply System Design

With that in mind, consider these five factors before moving on to the next section:

1. What features are important to you? For example, would you rather have a sink that supplies hands-free running water or one that saves water?

2. How big is your RV? This will determine how big of a freshwater holding tank you can install, or whether or not you have the space to set up a system with an electric pump and tankless water heater.

3. What’s your budget? The cheapest systems are also the most low-tech.

4. What’s your energy supply? Is having enough power no concern for you, or are you running off of a small solar grid? The answer will determine if you’re eligible for a system with an electric pump.

5. What’s your DIY skill level? If you’re new to renovating and don’t have much experience under your belt, chances are you’ll want to go with a low-tech system.

Different System Types for Your Sink

There are a few different ways to supply your sink or other needs with running water. We’ll go over a few of the most common and basic set-ups below.

City Water Hookups

A city water inlet allows RVers to connect to the local municipal water supply.

A city water hookup allows you to connect directly to the local municipal water supply. When parked in a campground, you can run a hose from a spigot to a port (also called an inlet) on the outside of your RV. A tube running from the port to your sink then supplies a steady supply of water with the turn of your faucet’s handle.

Pros to City Water Hookups

A city water hookup comes with the following benefits:

• It provides consistent water flow without needing a freshwater tank, electric pump, or manual pump
• It can be the most budget-friendly choice
• It’s great for RVs that are short on space
• It’s hands-free
• Installation is straightforward

These upsides alone are why I have a city water hookup on the outside of my self-converted class B van. It runs straight to my sink and nowhere else. However, it’s not the only water system that I have, for reasons you’ll see below.

Cons to City Water Hookups

While that list above might seem like a lot of clear advantages, a city water hookup alone is probably not going to be the only water system you want or need. Consider these downsides:

• You’ll need to cut a hole in the side of your vehicle
• You won’t have access to water away from a hookup

That second point is the biggest reason why you’ll need more than just a city water hookup for your rig. Without some sort of tank-based system, you won’t be able to venture far beyond the campground.

System Overview

The following is an overview of my personal city water hookup system. This is a very simple system that only supplies one sink in my small RV.

In addition to a sink, some beverage-grade hoses, clamps, and a greywater tank, you will also need:

A city water inlet

This city water inlet from JR Products is reliable and popular. It’s the one I use on my own rig. To install, you’ll have to cut a hole to size in the side of your RV, then connect it to a hose that runs to your sink (or whatever else you want to supply). Watch the video below for a quick overview of how to install it:

A potable water hose

This is what you’ll use at the campground to connect the spigot or hookup to your inlet.

It’s important to get a hose that won’t add funny tastes or leach chemicals into the water, especially if you want to use it for drinking. This 25-foot-long hose from Camco is not only lead and BPA-free but is the #1 best selling drinking water hose on Amazon.

A pressure regulator

The water pressure at some campsites is too high for the small tubes running through your camper. It could cause serious damage if you’re not careful.

Connect a lead-free pressure regulator like this one to the spigot before you attach the potable water hose. You’ll be able to monitor and control how much water is flowing into your RV. The video below goes into this process more in depth:

This RV sink can run on a city water hookup or from a freshwater holding tank using an electric pump.

An electric pump draws water from your freshwater holding tank and supplies it to your sink or any other plumbing you may have. Simply turn on the faucet, and you have instant running water.

Pros to Electric Pumps

The main advantage of electric pumps is that they offer hands-free running water wherever you are. You don’t need to be hooked up to city water at a campground to use your sink or shower.

For many people, this is as good a reason as any to move forward with installing an electric pump. Of all the solutions in this guide, it’s is probably the most convenient.

Cons to Electric Pumps

This level of convenience won’t be a priority for everyone. Consider these disadvantages:

• Installation is complicated
• It’s expensive
• It requires several additional parts
• It can put a strain on your electrical system, which isn’t great if you want to save energy in your RV
• It isn’t the best if you want to save water
• It requires a lot of space, which isn’t possible with some smaller RVs

System Overview

In addition to a sink and a greywater tank (which as you’ve gathered by now is standard for all of these systems) you’ll need:

Electric pump

The go-to brand for RV electric pumps is SHURFLO. This one can pump three gallons per minute, runs on 12V DC, and according to many satisfied reviewers, is extremely quiet when operating.

Accumulator tank

To get the most out of your pump, you’ll also need an accumulator tank. It’s essential for keeping the water pressure up without overheating your pump.

Strainer

The final piece of the puzzle is to add a strainer to the head of your pump. This will keep debris out of the pump that might otherwise damage it and reduce its longevity.

freshwater tank

Electric pumps tend to use a lot of water, so you’ll need a freshwater tank that’s up to the task. This 20-gallon tank from Barker Manufacturing comes with many of the hoses, clamps, and fittings you’ll need to hook it up to your pump.

Tankless water heater

While not mandatory, chances are that if you like the convenience of an electric pump, then you’ll also love having instant hot water. A tankless water heater can warm your supply up instantly without having to hold it in a separate tank. This guide will walk you through the best option and things to consider.

For an even more comprehensive look at how you can install an electric pump in your RV, check out this thorough overview.

Hand Pumps

The hand pump on the right manually supplies water from a tank. The faucet on the left connects to a city water inlet and can be used when there’s access to a city water hookup.

If you don’t want to fuss with electrical components, a hand pump might be the right fit for you.

A hand pump is a combination faucet and pump that draws water from your freshwater tank by moving a handle back and forth. It’s a very simple solution, one that I personally use and enjoy in my RV because it doesn’t put any pressure on my solar-powered electrical system.

Pros to Hand Pumps

Here are the upsides to a hand pump:

• There’s no electricity needed
• Installation is easy
• They’re affordable
• The all-in-one construction helps save space in small RVs
• They help you conserve water

Cons to Hand Pumps

Hand pumps aren’t for everyone. If you want to wash dishes or do other things hands-free, this probably isn’t the best option for you.

Residential Water Supply Design

System Overview

A look under think of my freshwater and greywater tank.

Here’s an overview of my hand pump system. It’s easy enough that even someone with no DIY experience can probably tackle it on their own.

Hand pump

I use this chrome hand pump from Valterra. It’s more commonly found in boats but works just as well in my RV. To install, you’ll have to cut a hole in your sink or countertop.

Freshwater tank

I run a clear beverage-grade hose from the hand pump down into my freshwater tank, which is currently a rugged and BPA-free seven-gallon tank from Aqua-Tainer. I screwed a threaded PVC fitting into the spigot opening to help hold the hose and prevent splashing while the RV is moving.

Greywater tank

The black drain hose that came with the sink runs down into a smaller grey tank. This catches all my greywater.

Instead of a greywater tank, you could get a portable tote tank. These tote tanks hold grey or black water and have a set of wheels attached so that you can easily move them to the appropriate dumping station. Check out our guide for choosing the best tote tank.

This is just an example of how a manually pumped tank-based system can work. I have a small class B RV, so I have a small system. You can use the same principles but on a larger scale in your vehicle.

To see another example of how some RVers used this system in their rig, check out this guide.

Foot Pumps

A foot pump is another manual option mounted to the floor of your RV. You push the pedal with your foot, which then draws water from your freshwater tank to your sink. This method is traditionally found in boats, but more and more RVers are considering it for their customized vehicles.

Pros to Foot Pumps

If you like the idea of a manual pump but want a little more convenience, this might be the system for you. Here are some other benefits:

• You can have hands free running water
• It’s a little more powerful than a hand pump
• You can still save water
• Installation is easy enough for beginner DIYers

Overall, this is a nice happy medium when it comes to convenience, budget, and ease of installation.

Cons to Foot Pumps

There are a few downsides, of course:

• It’s a little more expensive than a hand pump
• You need to buy an additional faucet

System Overview

As per usual, you’ll need a sink, freshwater tank, and greywater tank. You’ll also need to connect the following components with some tubing:

Foot pump

Marine supply company Whale built this foot pump for boat galleys but many RVers are finding that it works just as well in small rigs.

Faucet

Whale has a matching faucet that is perfect for using with their foot pump. It has no handles and will automatically start supplying water whenever you press on the pump.

Install or Upgrade Your RV’s Water Supply System Today

There several different ways to bring running water to your sink. You can choose to go the traditional route with city water hookups and electric pumps, or you can experiment with energy and water-saving systems like hand pumps and foot pumps.

Whatever your needs and constraints are, whether they’re budgetary or space-related, there’s a solution out there that fits you.

By O. Oyedele Adeosun, Obafemi Awolowo University

INTRODUCTION

Providing sufficient water of appropriate quality and quantity has been one of the most important issues in human history. Most ancient civilizations were initiated near water sources. As populations grew, the challenge to meet user demands also increased.

People began to transport water from other locations to their communities. For example, the Romans constructed aqueducts to deliver water from distant sources to their communities.

Today, a water supply system consists of infrastructure that collects, treats, stores, and distributes water between water sources and consumers. Limited new natural water sources, especially in the southwest region of the USA, and rapidly increasing population has led to the need for innovative methods to manage a water supply system. For example, reclaimed water has become an essential water resource for potable and nonpotable uses. Structural system additions including new conveyance systems and treatment and recharge facilities and operation decisions, such as allocating flow and implementing conservation practices, are made with the present and future demands in minds. As additional components and linkages between sources and users are developed, the complexity of the water supply system and the difficulty in understanding how the system will react to changes grows.

Many efforts on the development of a water supply system have been made through for sustainable water supply. However, the complexity of system limited the site specific application at the first era. As water demands pressures raise increasingly on the existing water supply system, many studies attempted to develop a general water supply system to assist decision makers to design more reliable systems for a long range operation period. These attempts also include the optimization of total system construction and operation cost. Under given situations such as pipeline maintenance, non-revenue water, advanced metering infrastructure, the ultimate goal of this paper is to ensure water distribution system challenges are overcome and supply water sources to users reliably in a more sustainable and timely manner as a long-term plan.

Water Distribution Systems

The purpose of distribution system is to deliver water to consumer with appropriate quality, quantity and pressure. Distribution system is used to describe collectively the facilities used to supply water from its source to the point of usage.

Requirements of Good Distribution System

1. Water quality should not get deteriorated in the distribution pipes.
2. It should be capable of supplying water at all the intended places with sufficient pressure head.
3. It should be capable of supplying the requisite amount of water during firefighting.
4. The layout should be such that no consumer would be without water supply, during the repair of any section of the system.
5. All the distribution pipes should be preferably laid one metre away or above the sewer lines.
6. It should be fairly water-tight as to keep losses due to leakage to the minimum.

Layouts of Distribution Network

The distribution pipes are generally laid below the road pavements, and as such their layouts generally follow the layouts of roads. There are, in general, four different types of pipe networks; any one of which either singly or in combinations, can be used for a particular place. They are: Grid, Ring, Radial and Dead End System.

Grid Iron System:

It is suitable for cities with rectangular layout, where the water mains and branches are laid in rectangles.

Advantages:

1. Water is kept in good circulation due to the absence of dead ends.
2. In the cases of a breakdown in some section, water is available from some other direction.

Disadvantages

1. Exact calculation of sizes of pipes is not possible due to provision of valves on all branches.

Ring System:

The supply main is laid all along the peripheral roads and sub mains branch out from the mains. Thus, this system also follows the grid iron system with the flow pattern similar in character to that of dead end system. So, determination of the size of pipes is easy.

Home Water Supply System Design

Advantages:

1. Water can be supplied to any point from at least two directions.

Radial System:

The area is divided into different zones. The water is pumped into the distribution reservoir kept in the middle of each zone and the supply pipes are laid radially ending towards the periphery.

Advantages:

1. It gives quick service.
2. Calculation of pipe sizes is easy.

Dead End System:

It is suitable for old towns and cities having no definite pattern of roads.

Advantages:

1. Relatively cheap.
2. Determination of discharges and pressure easier due to less number of valves.

Disadvantages

1. Due to many dead ends, stagnation of water occurs in pipes.

NON-WATER REVENUE

Until the early 1990s, there were no reliable and standardized methods for accounting for water losses. Leakage management performance was measured in terms of “unaccounted-for water.” Since this term had no generally accepted definition, there was wide room for interpretation. Unaccounted-for water was typically expressed as a percentage of system input, which is already problematic.

Given this situation, utility performance could not be measured or compared, realistic targets could not be defined, and performance against targets could not be tracked reliably.

While this situation still exists in many countries, significant progress has been made to address these past shortcomings. Over the last 20 years, a number of organizations from around the world have developed a suite of tools and methodologies to help utilities evaluate and manage water losses in an effective manner.

One recommendation of the WLTF (Water Loss Task Force) was to use the term “non-revenue water” instead of “unaccounted-for water.” NRW (non-revenue water) has a precise and simple definition. It is the difference between the volume of water put into a water distribution system and the volume that is billed to customers. NRW comprises three components as follows:

Physical (or real): losses comprise leakage from all parts of the system and overflows at the utility’s reservoirs. They are caused by poor operations and maintenance, the lack of active leakage control, and poor quality of underground assets.

Commercial (or apparent): losses are caused by customer meter under registration, data handling errors, and theft of water in various forms.

Unbilled authorized consumption: includes water used by the utility for operational purposes, water used for firefighting, and water provided for free to certain consumer groups.

Although it is widely acknowledged that NRW levels in developing countries are often high, actual figures are elusive. Most water utilities do not have adequate monitoring systems for assessing water losses, and many countries lack national reporting systems that collect and consolidate information on water utility performance. The result is that data on NRW is usually not readily available. Even when data is available, it is not always reliable, as some poorly performing utilities are known to practice “window dressing” in an attempt to conceal the extent of their own inefficiency.

Lost water can be calculated as (A + L + R) [d] × flow rate [m3/d] = water lost [m3]

The volume of water lost from an individual pipe burst does not only depend on the flow rate of the event, but is also a function of run time. This is often overlooked. The leak run time consists of three components:

• Awareness time: time until the utility becomes aware that there is a leak
• Location time: time spent to precisely locate the leak so that a repair job order can be issued
• Repair time: time between issuing of repair job order and completion of the repair

PIPELINE MAINTENANCE

Many water utilities in Asia practice passive leakage control, meaning that they repair only those leaks that are visible. This is clearly not enough since 90% of the leaks are usually not visible on the surface. This means it takes far too long, often many years, until the utility is even aware that there is a leak. Since awareness time largely determines the volume of water lost from a pipe burst, utilities need a strategy to reduce awareness time.

The most traditional and basic method is to have a team of leak detection specialists who check all pipes on a regular basis. Since leak noise can be detected, this work is done with a wide range of listening devices, ranging from simple mechanical listening sticks to electronic ground microphones or even leak noise correlators. Leakage inspectors use this equipment to listen to the network and identify problems, much like doctors use stethoscopes. If every part of the network is surveyed once a year, the average leak run time (awareness time) is 6 months. To reduce awareness time, the survey frequency can be increased. However, leak detection efforts will still not be well targeted. To be able to determine how much water is lost in specific parts of the network, the network must be split in hydraulically discrete zones and the inflow to these zones must then be measured. By computing the volume of leakage in each zone, leak detection specialists can better target their efforts. Clearly, the smaller the zone, the better the information and the efficiency of leak detection. The smallest zones are called District Metered Areas (DMAs). A DMA is hydraulically discrete and ideally has only a single inflow point. The inflow and corresponding pressure is measured and monitored on a continuous basis. Ideally, when the entire distribution network is split into DMAs, the utility has several advantages. For instance:

• The volume of NRW (the difference between DMA inflow and billed volume) can be calculated on a monthly basis.
• The components of NRW (physical and commercial losses) can be quantified by analysing flow and pressure data.
• Leak detection works can be prioritized.
• New pipe bursts can be identified immediately by monitoring the minimum night flow, and therefore awareness time will be reduced from several months to several days (or even less).
• When leakage is eliminated, utilities can better gauge the existence of illegal connections or other forms of water theft and can take action.

Furthermore, DMAs (District Metered Area) can be helpful in managing pressure. At the inflow to the DMAs, pressure reducing valves can be installed, and the pressure in every DMA can be adjusted to the required level. There is no ideal size for a DMA. The size, whether it is 500 or 5,000 service connections, is always a tradeoff. The decision has to be made on a case-by-case basis and depends on a number of factors (e.g., hydraulic, topographic, practical and economic).

Water Supply Design Pdf

The size of DMAs has an impact on the cost of creating them. The smaller the DMA, the higher the cost. This is because more valves and flow meters will be required and maintenance is costlier. However, the benefits of smaller DMAs are that:

• new leaks can be identified earlier, which will reduce awareness time;
• location time can be reduced because it will be faster and easier to pinpoint the leak; and
• as a byproduct, it is easier to identify illegal connections.

Topography and network layout also play an important role in DMA design and size. Therefore, there will always be DMAs of different sizes in a distribution network. An important influencing factor is the condition of the infrastructure. If mains and service connections are fragile, then bursts will be more frequent and the optimal DMA will be relatively small. On the other hand, in areas with brand new infrastructure, DMAs can be larger and still manageable.

According to the recommendations of the International Water Association’s (IWA) Water Loss Task Force, if a DMA is larger than 5,000 connections, it becomes difficult to discriminate small bursts (e.g., service connection bursts) from variations in customer night use. In networks with very poor infrastructure conditions, DMAs as small as 500 service connections might be warranted. A calibrated hydraulic model should always be used for DMA design irrespective of the size of the DMAs.

Water losses from larger diameter pipes can be quite significant, especially in the Asian context with predominantly low-pressure systems, where leaks will not come to the surface and remain unnoticed for many years. Leaks on large diameter pipes are always difficult to detect and often specialized equipment is required (e.g., inside pipe inspection and leak detection). These techniques are costly but might be economically well justified where water availability is limited and every cubic meter of water recovered can be sold to existing or new customers.

ADVANCED METERING INFRASTRUCTURE

Commercial losses are nearly always less in volume than physical losses, but this does not mean that commercial loss reduction is any less important. Commercial loss reduction has the shortest possible payback time, as any action immediately results in an increase in billed volume and an increase in revenues. Commercial losses consist of three main elements:

• customer meter under-registration;
• illegal connections and all other forms of water theft; and
• problems and errors in metering, data handling, and billing.

Metering: Minimizing customer meter under-registration requires substantial technical expertise, managerial skills, and upfront funding. Customer meter management should be undertaken holistically, best described by the term “integrated meter management.”

In this effort, utilities should seek to select appropriate meter types and prepare tailored specifications. This can prove difficult, especially where procurement laws and regulations encourage purchasing the cheapest products on the market.

A number of meter manufacturers produce meters that “on paper” meet the specifications but deteriorate at an amazing rate in the field. This is one of the major obstacles for sustained improvement of customer meter accuracy. Contributing to this problem is the lack of good quality meter testing facilities, especially when it comes to larger diameter meters, and the lack of experience in how to best utilize such facilities. This makes it easy for manufacturers to supply meters from second class quality manufacturing batches with little risk that the utility would ever find out.

Another common problem is the reluctance to invest in high quality but more costly meters for large customers. Normally, the top accounts of a utility generate such a large portion of their revenues that any investment in more advanced meters can be economically justified. The payback time is often just a matter of months. Yet, many water utilities opt to maintain and calibrate old meters over and over again instead of taking appropriate action and installing new meters.

Billing system issues: The billing system is the only source of metered consumption data that can help determine the volume of NRW through an annual water audit. However, most billing systems are not designed to retain the integrity of consumption data. Rather, they are designed to deliver accurate bills to customers and correctly account for the bills. However, there are many day-to-day processes in operating a billing system that have the potential to corrupt the integrity of the consumption data, depending on the design of the particular system. Issues that can affect consumption volumes include

• meter reading practices
• handling of reversals of over-estimation
• processes used for dealing with complaints about high bills
• customer leaks
• estimation of consumption
• meter change-outs
• tracking inactive accounts, and
• the processes for the identification and rectification of stuck meters.

Water theft: While meter under-registration is more of a technical problem, water theft is a political and social issue. Reducing this part of commercial losses is neither technically difficult nor costly, but it requires making difficult and unpleasant managerial decisions that may be politically unpopular. The reason is that illegal connections are nearly always wrongly associated with only the urban poor and informal settlements. However, water theft by high-income households and commercial users, sometimes even large corporations, often accounts for sizable volumes of water lost and even higher losses of revenue.

In addition to illegal connections, other forms of water theft include meter tampering and meter bypasses, meter reader corruption, and illegal hydrant use. Another common problem is “inactive accounts.” In cases where a customer’s contract has been terminated, the physical service connection, or at least the tapping point on the main, still exists and is easy to re connect illegally. A stringent inactive account management and verification program can easily solve this problem.

CONCLUSION

Water distribution system should be based on a pipe layout that is suitable and have no or less water stagnation within the pipe to avoid tuberculation, encrustation and sediment deposits

Through a wealth of specialized publications and software development is now well understood that water distribution system management is technically difficult, but with current technologies, software systems, and highly specialized equipment (flushing and scraper), this is simply not the case anymore.

Water utilities will also need to practice appropriate design of system expansions/distribution (e.g., new network parts already constructed as DMAs) and use higher quality works, materials, and equipment. In addition, regulators and policy makers should require water utilities to do periodic water audits and regularly publish detailed water distribution system data, which can then be independently audited.

Again, water distribution system management should not be a one-time activity. Although an intense and comprehensive water distribution system reduction program is suitable to reduce the backlog of required water distribution system reduction measures, it should not lead to a sustainable low level of water distribution system unless water distribution system management becomes part of the normal day-to-day activities of the water utility.

Contact the author at dheyley@gmail.com.