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Welcome to H2O News

Issue # 015 : Urban Irrigation, Tucson Rainwater Harvesting Conference, IA Show in San Antonio

H2O News is an on-line publication that announces publications, policies, and activities about the world's water on a weekly basis. Articles or headings are followed by links that will take you to the complete article you are interested in.

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New Water Events

1. Urban Irrigation Without City Water
2. Tucson, Arizona Rainwater Harvesting Conference Oct. 27 & 28/06
3. IA Show in San Antonio

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1. Urban Irrigation without City Water – by Lorne Haveruk

Bay Bloorview Children's Centre is being torn down. A new state of the art building right from the ground up to the 11 rooftop gardens is coming.

An elaborate reclaimed water irrigation system has been designed. All of the water will come from rain water collected onsite and stored in an underground 100,000 gallon cistern.

Rooftop gardens will be created utilizing low volume drip tubes controlled by soil moisture sensors. The entire system will be controlled onsite by a tipping rain bucket device. ET data for automatic scheduling will be supplied from a local ET weather station. Trees are watered individually with micro bubblers while strip planter areas will utilize dripline placed in the plant root zone area and then mulched to achieve a high retention level resulting in a highly efficient irrigation system.

The irrigation mainline will be connected to the city water supply only to be utilized if the cistern runs dry. The cistern has been sized to supply water up to 90 days before running out. Was their to be such a long dry spell, the building automation system would receive a low water level signal from a float device within the cistern tank. This would cause the cisterns vertical turbine pump to become non-functional. Instead, the city water supply attached to the irrigation mainline, complete with all required water protection devices, would be automatically opened by the building operating system when the weather called for the next watering cycle to occur. A check valve at the cistern prevents the city water supply from filling the cistern with city water. Instead, the city water will only be used until the low water level indicator goes out once a rain event recharges the cistern.

Sound like a dream system? It is being closely watched to see if it may be one of the answers to many cities growing water supply issues. Phase 1 is reality now with phase 2 not far behind. Will the system work as designed? Yes and no. Yes, because the design principles I have applied are sound. No, because the contractor is taking shortcuts. A lesson learned here is the developer must have a qualified person do periodic inspections or the best laid plans could be derailed by another’s inadequacies.

This project will be highlighted during the technical sessions at the Irrigation Association (IA) convention in San Antonio, Texas.

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2. Tucson, Arizona Rainwater Harvesting Conference Oct. 27 & 28/06

The Regional ARCSA conference will focus on the management of stormwater and rainwater to satisfy federal stormwater requirements while using the harvested water to reduce demand and/or recharge groundwater supplies. The conference meetings will be on the 27th of October. Emphasis will be given to the design of sites in the pre-development stage for beneficial water management. Homeowner projects will also be discussed. Post-conference tours on October 28th will take participants to rainwater and stormwater harvesting sites around the Tucson area. Developers, engineers, architects, earth workers and homeowners are encouraged to register.

http://ag.arizona.edu/AZWATER
C lick on Tucson Rainwater Harvesting Conference link for all the information

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3. IA Show in San Antonio will discuss rainwater collection

Rainwater Harvest
Add profit to your next irrigation job and help customers save water by installing a rainwater harvesting system. Dick Peterson of the Austin Energy Green Building Program will address growing an irrigation contracting business with rainwater harvesting in a Technical Session in San Antonio. See the full schedule. http://www.irrigation.org/

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Thanks for reading! If you have suggestions or ideas for articles send them along.

Lorne Haveruk C.I.D., C.I.C., C.L.I.A
Editor, H20 News
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