The chances of an abundant water supply for California growers this summer keep improving as the water content in snowpack remains far above normal. The state Department of Water Resources third manual snow survey of the season found a snow-water equivalent of 43.4 inches on March 1 — well above the average of 24.3 inches for the date. “It’s not the record, the record being 56.4 (inches), but it’s still a pretty phenomenal snowpack,” state snow survey chief Frank Gehrke told reporters after the survey at Phillips Station, about 90 miles east of Sacramento.