We are a licensed engineering firm in Texas that provides design and consulting services for rainwater harvesting systems on residential and commercial projects.  We specialize in systems that are used for irrigation, potable, and stormwater detention purposes.

It might be a surprise to you but we see many rainwater collection systems that are either not designed on residential projects (so it’s thrown onto the builder or other contractor to “figure out”) or under-designed on commercial projects (a circle drawn on the plans for the cistern does not constituent a rainwater harvesting system).

This leads to cost overruns or even cutting the rainwater collection system from the project all together due to not planning for its integration into the project.  You don’t want this to happen.  Save money, save time, and relieve stress during the construction process by allowing us to design the rainwater harvesting system upfront.

Who uses this service?

  • Homeowners who don’t know where to start so you would like a documented system plan for either your use or to provide to other contractors to solicit bids (great option if you are not located in central Texas where IWS can design AND build your system for you).
  • Homeowners who are building a new house and want to ensure the proper system integration into your house/property.
  • Architects and Engineers who have been asked to incorporate a rainwater harvesting system into your project.
  • Homebuilders or Contractors who have clients that want to install a rainwater catchment system but there aren’t any construction plans or the existing plans leave a lot of questions.

Benefits of using a licensed design professional

1. Design Liability (who is responsible for system design failures if you use a non-licensed design professional?)
2. Opportunity to determine any obstacles prior to construction
3. System optimization according to the desired water conservation goals
4. Creation of realistic budget for the designed system (why put time and effort into designing a system just to have it value engineered out of the project because a realistic system budget wasn’t created?)

Rainwater Harvesting Systems for Residential Projects

Rainwater collection systems can provide auxiliary water and/or potable water supply on residential projects.

  • To supplement or replace municipal water use in the irrigation system
  • To supplement or replace the use of municipal water for indoor, non-potable uses such as toilet flushing
  • To meet local stormwater detention requirements
  • To provide whole-house, drinking water supply

The difficulty is in designing a rainwater harvesting system that can efficiently collect rainwater but ensure that the system can be installed within a certain budget. No matter if your concerns are aesthetics, functionality, or maintenance issues, we have the necessary experience to overcome any obstacles and design a system to fit your need and budget.

fiberglass cistern for rainwater

Rainwater Harvesting System Design Packages for Residential Projects

These design packages are intended to streamline the system design process and provide you with plans that fit your situation.  With these plans, you can now have design documents that you can use to implement the system or you can provide to your contractor or home builder for them to install the system so that everyone to be on the same page.

Note: For the custom design packages, you must provide a pdf or cad version of your home plan and/or property plat.

  • Rainwater System Kit Design Plans
    $125
    • For any sized home
    • Typical plans: adapt the ideas from the plans for your use and house layout
    • Typical downspout drawings & schematics
    • List of system components
  • Rainwater System for Homes <2,000 sf
    $425
    • Design for irrigation supply only
    • Custom design: Rainwater system design for your house layout
    • Custom report: rainwater collection potential
    • System specs (pump, components, etc)
  • Rainwater System for Homes >2,000 sf
    $795
    • Design for irrigation supply only
    • Custom design: Rainwater system design for your house layout
    • Custom report: rainwater collection potential
    • System specs (pump, components, etc)
  • Rainwater System for Potable Supply
    $1195
    • Homes without well/municipal water access
    • Custom design: Rainwater system design for your house layout
    • Custom report: rainwater collection potential
    • System specs (pump, components, etc)

Rainwater Harvesting Systems for Commercial Projects

Rainwater collection systems can provide auxiliary water for many different opportunities on commercial projects.

  • To supplement or replace municipal water use in the irrigation system
  • To supplement or replace the use of municipal water for toilet and urinal flushing
  • To supply auxiliary water for internal building processes that do not require a municipally treated water source
  • To supply any ancillary water uses such as vehicle washing, site washing
  • To meet local stormwater detention requirements

The difficulty is in integrating the rainwater harvesting system into your commercial project so that it can efficiently provide the desired result.  No matter if your concerns are aesthetics, functionality, or maintenance issues, we have the necessary experience to overcome any obstacles and creatively integrate the rainwater catchment system into your project.

underground fiberglass cistern excavation

Don't know where to start?

Our feasibility report service can get you going on the right track by examining different system scenarios

Learn more

Clients We’ve Worked With Over the Years

Rainwater Harvesting System Design Packages for Commercial Projects

These design packages are intended to streamline the system design process and provide a complete engineered system design that is integrated into the building and site design.  With these packages, you can budget these into your design budget.

The greatest benefit of these packages is that now you will have a complete design for the rainwater harvesting system, detailing all of the various interaction points involved in the system.  No longer will you have to take the responsibility to ensure the adequate design of the rainwater harvesting system.

By having a complete engineered system design for the rainwater harvesting system, this will help provide the installation contractor with the required information to create an accurate construction estimate, eliminating any extra buffer costs that would be estimated into the system installation cost due to the “unknowns” in an incomplete system design.

These prices apply to most projects but depending on the complexity of the cistern integration or collection piping, we reserve the right to provide an individual proposal for your system design.

  • Commercial Building up to 5,000 sf
    $2350
    • Irrigation use only
    • Feasibility Report
    • System design and details
    • System specification document
  • Commercial Building between 5,000 and 10,000 sf
    $2975
    • Exterior or Internal use
    • Feasibility Report
    • System design and details
    • System specification document
  • Commercial Buildings between 10,000 and 25,000 sf
    $3850
    • Exterior and/or Internal use
    • Feasibility Report
    • System design and details
    • System specification document
    • Building system integration
  • Commercial Buildings larger than 25,000 sf
    $4750
    • Exterior and/or Internal use
    • Feasibility Report
    • System design and details
    • System specification document
    • Building system integration

Rainwater Harvesting Feasibility Reports

Imagine impressing the project owner’s with a full assessment and analysis of the rainwater harvesting potential of the project?

Planning for a rainwater harvesting system and its integration within a project building and site can take a lot of time.  Why spend all that time planning and designing the system just to find out that it doesn’t provide the anticipated savings or find out that the system cost is way over the its budget in the project?

This report is perfect for architects or engineers who are investigating the potential opportunity of including a rainwater harvesting system on your project.  The range of reports allows you to purchase exactly what you may need in terms of the analysis level.

  • Feasibility Consulting
    $100
    • Hourly consulting rate
    • One hour minimum
    • By phone, Skype, or in our office
    • Pre-payment required
  • Feasibility Report Package #1
    $195
    • Total collection potential calculated
    • 1 Scenario Analyzed
    • Water demands provided BY you
    • 30 years of rainfall data analyzed
    • Report formatted for LEED documentation
  • Feasibility Report Package #2
    $345
    • Includes items in lower package plus;
    • 2 Scenarios Analyzed
    • Water demands calculated FOR you
    • Includes (1) report revision, if needed
    • 5% discount on design packages
  • Feasibility Report Package #3
    $495
    • Includes items in lower packages plus;
    • 3 Scenarios Analyzed
    • Construction Cost Estimates
    • Phone conversation with engineer
    • 10% discount on design packages

Annual Subscription Program

If you are part of a design firm with multiple offices, municipality, or company and you want to run multiple reports for different projects throughout the year, we offer an annual subscription program. Please call us at 512-490-0932 to find out pricing of our subscription program.

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