|
gallons, and a total storage capacity of 7.4 million gallons. We have a safe yield from all of those lakes, I
<br />might mention the slide here says one billion gallons when empty. We have some physical limitations that
<br />would put us in a tough situation to have to achieve getting that last one billion gallons of water out of the
<br />lake. That is not to say we couldn't do it if we had to. But we don't count on it in our safe yield calculations.
<br />We have 37 million gallons a day, based an a 50-year safe yield, using the storage that we have readily
<br />available to us. We also have a web page that we keep up to date. Ever since last summer we've started
<br />doing this and you can ga to our web page and see current lake levels and what our situation is at anytime.
<br />The web page is www.ci.durham.nc.us. We set a record low level last year in bath Lake Mickey and the Little
<br />River. Everybody knows it has been a pretty dry period. Our low levels in Lake Mickey got to 318.2 on
<br />December 26, 2001 and the previous record low level had occurred in 1998. The Little River got down to
<br />326.6, an January 6, 2002. That also set a record law level for us. Our current situation is Lake Mickey has
<br />come back up about 19.65 feet, but we are still 3.15 feet below full. We were full about a month ago at Lake
<br />Mickey, but the dry weather has started to pull it back dawn again, or the demand combined with the dry
<br />weather. And Little River Lake hasn't filled up yet this year, which is kind of unusual for us. We have never
<br />in the history of Durham not been full by the first of April, so we are kind of plowing new ground this year. We
<br />are not concerned about it yet, but if it continues, we'll start to look a little closer at that. But we are about six
<br />feet down still in Little River, but we've come up 22 feet. So we are a lot better than we were.
<br />This is a projection of our demand. We are expecting to meet our average daily demand. Our raw
<br />water safe yield at 37 million gallons per day, we would expect to meet about 2010, just a little beyond 2010.
<br />of course, with the State guidelines at 80°~ of that number, we would be bumping up against that 80%
<br />number about 2005. Because of that, we have a pending application now with the State for allocation from
<br />Jordan Lake. Our water treatment capacity is currently 52 million gallons a day, and we have an expansion
<br />underway now to increase that to 61 million gallons per day, but that's not finished yet. Our peak demand
<br />would hit that 52 million gallon per day, based on the projection of previous demand, just beyond 2005 and hit
<br />the 61 at about 2015. And again, we have the same 80°~ rule for water supply and water treatment, so we
<br />would need to be looking at further expansion probably before that time.
<br />The questions included a question about projection of population, and this is from our planning
<br />department. We are projecting all the way to 2050 a population in Durham of about 329,000 people. At
<br />2020, about 276,000.
<br />These are our projected demands. In 2020, the projected demand is right out of our Jordan Lake
<br />application. This is dealing with raw water supply, so the average daily 2020 demand is about 45, exceeding
<br />our current 37. The 2050 demand is about 54 million gallons a day.
<br />This is just something I threw in here so you can kind of see what we have been up against the
<br />last several years, and most of you know what you have been up against. These are the lake levels of Lake
<br />Mickey and Little River and the record low levels that we reached in 2001-2002. And you can see we came
<br />close to that except for Little River in 1998. And I will mention, one thing we did this year and back in the fall;
<br />having had the two dry years pretty much in a row, we typically don't see three dry years in a row, and really
<br />didn't anticipate this year being as dry as its been. So we needed to do some work on Little River Lake and
<br />we pulled the lake down intentionally for some of that work, and you can see that flat line on the curve there
<br />where we were doing that work and the lake level just held steady while we were doing that. But Lake
<br />Mickey continued to fall and meet the needs of the city, and so it reached pretty low levels. But we were able
<br />to meet all the needs of the city during that period of time, and we did get to stage two of our water
<br />conservation ordinance, which is a voluntary conservation, but we didn't run out of water.
<br />Some of our potential future water supply we have in planning is the 10 million gallons per day
<br />from Jordan Lake. We have been looking at Teer Quarry as a passible storage facility that could yield us
<br />three to five million gallons. All of the water didn't get allocated from Jordan Lake, sa there is the potential we
<br />might get additional allocations from Jordan Lake in the future. We have been acquiring land since about
<br />1989 around Lake Mickey far the possible future expansion of Lake Mickey by either raising that dam or
<br />building a new dam. That's probably our most expensive alternative. It's not easy to raise an existing dam.
<br />The current dam is about 80 feet tall, and the new dam would be probably 120 feet tall, so it is not going to be
<br />a cheap dam to build when we have to build it. There is the possibility of a reservoir an the upper flat as well
<br />that could either combine with the expansion of Lake Mickey or substitute far the expansion of Lake Mickey.
<br />We don't have any land acquired for that, and most of that would be in Person County, so there is an issue of
<br />interlocal cooperation to get that lake to became a reality. As part of our Upper Neuse Basin Study recently,
<br />we did realize that that upper flat lake could provide some water quality benefits for Lake Mickey, so there
<br />might be same reasons for doing a lake above Lake Mickey just to provide water supply and water quality
<br />
|