Hi Thank all who send me good and applicable and also wild ideas about plugged standpipe piezometers.there are many laughing ideas. Continue sending your practical and wild ideas about them. I will put them together and publish them as "Good and wild ideas about plugged standpipe piezometers". Did you watch the "Road runner and Caiot" cartoones? They are similar to Caiot's ideas those are full of thinking and full of bad chance! Thank you all very yours sincerely Siavash