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I live in Arizona and the city of Tempe has a large lake. So I contacted
Basil Boyd at the Tempe City offices and following is his response. - Bill
Schmitt
Bill,
The evaporation numbers that we use to work out the Tempe Town Lake water
balance are generated by a weather station on the ASU campus, which is
adjacent the lake. The total evaporation loss for calendar year 2002 was
1,697.8 acre-feet. The surface area of the lake is 222 acres. This means
the evaporation loss was 7.65 feet of water. This is in line with pan
evaporation rates I have seen for other areas in the southwestern deserts.
For comparison you might take a look at the attached web site. It gives pan
evaporation rates for several Western states including many Arizona sites.
Let me know if you have any other questions.
http://www.wrcc.dri.edu/htmlfiles/westevap.final.html
Basil Boyd
[log in to unmask]
Water Resources Hydrologist
City of Tempe
-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]]On Behalf Of Kathryn Briggs
Sent: Friday, November 21, 2003 2:17 PM
To: [log in to unmask]
Subject: Re: splash
ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related
institutions.
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I don't have any math to back me up but from experience -- you'll loose
about two inches per week -- this is relative to amount of sun, wind -- and
of coarse -- rain. (remarkably, relative humidity has little effect)
-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]]On Behalf Of Kay Ziff
Sent: Friday, November 21, 2003 3:16 PM
To: [log in to unmask]
Subject: splash
ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related
institutions.
****************************************************************************
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Have any of you needed to calculate water loss due to evaporation and/or
splashing on an outdoor water feature? Can you suggest a way to estimate
it?
The specific details are that we're planning to have about 200 sf of water
surface on a recirculating flow. Visitors will have access to it, but we
won't offer any buckets, scoops, or other obvious invitiations to pour
water on the ground.
thanks,
Kay Ziff
Exhibit Developer
Bay Area Discovery Museum
557 McReynolds Road
Sausalito, Ca 94965
Phone: 415/339-3922
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