Posted 07-02-2003 at 18:42:45
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found the article on pond leaks in April 2003 Progressive Farmer.
a. hay, gets soggy and migrates to leak.
b. disking the bank around edge of pond (if clay soil). rain washes clay into pond and may seal leak.
if that doesn't work:
c. drain pond, disk soil to 10 inches deep, remove rocks and roots. compact with sheepsfoot roller.
d. "c" above, then bring in soil with at least 20% clay. spread in 6 - 8 inch layers, compacting each layer. min of 12 inches compacted for water up to 10 feet deep. add 2" of compacted clay for each additional foot of water over 10 feet.
e. Bentonite, at 1 - 3 lbs per sq. foot. mixed with local soil to a depth of 6" and compacted. then cover with local soil to protect bentonite layer from physical damages.
f. sodium polyphospate ,(0.05 - 0.1 lb. per sq. ft) or sodium chloride (0.2 - 0.33 lb/sq ft.) soil analysis to determine which is best and how much per ft.) chemical methods are best used with no more than 50% silt and at least 15% clay. mixed with local soil and compacted to a depth of 6" min.
hope this might be of help to someone.