Mr. Hatton. It may be that I can best describe this process and the results we are getting from it by giving you the situation in Milwaukee, which is somewhat, as I take it, comparable with some of the situations here. We discharge the crude sewage from the city of Milwaukee into three rivers, from whence it flows into Lake Michigan, and 3½ miles away from the harbor entrance we take our water supply, in a depth of 50 feet. At the present time the water supply is being partially or entirely sterilized by the use of liquid chlorine. There is at the present time about an average of sixty millions of sewage per day being discharged into Lake Michigan.
Mr. Tawney. Sixty million gallons?
Mr. Hatton. Yes; and during this time the lake for an area of about 25 square miles has become polluted, B. coli being retained in that entire surface of the lake; and at all times we find the presence of B. coli at the intake of our water supply, but the treatment of liquid chlorine has, with one exception, enabled us to sterilize the water with about twenty-eight hundredths to thirty hundredths part of liquid chlorine. Last February we got a little larger quantity of B. coli than usual because of four or five days of southeastern storm, and in spite of the fact that we put all the liquid chlorine in and more than the water would absorb, we got a typhoid-fever epidemic in three or four weeks of about two hundred and some odd cases. Now, that is the situation in Milwaukee, and for the purposes——
Mr. Powell. Before you pass on, you say 25 square miles has become polluted?
Mr. Hatton. Yes.
Mr. Powell. How far into the lake would the pollution extend?
Mr. Hatton. About 5 miles; 3 miles on either side of the harbor and 5 miles from the shore. The city is located on Milwaukee Bay, which is a long crescent, about 10 miles from point to point.
Mr. Powell. How far from the outlet of the sewer to the intake?
Mr. Hatton. Three miles and a half; and in addition to that, there is a breakwater, which is supposed to partially prevent the water from flowing from the harbor toward the intake.
Mr. Powell. You pursued your investigations beyond the 5 or 6 miles?