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.� qi+'. f�'t mow- �,�mb^.win •4'- r 1228 N STREET ROOM 24qW - SACRAMENTO, CALIFORNIA 95814 (916) 442-3155 - MEUEIVEL) June 4, 1982 OCT 02 102 V!R®NMENTAL HEALTH Mayor Edmund Feichtmeir PERMIT/SERVICES City of Ripon 311 W. First Street Ripon, CA 95366 - Dear Mayor Feichtmeir: I greatly appreciate your recent response to my letter of inquiry about flows in the lower Stanislaus and their effect on the operation of the Ripon industrial sewage ponds. I 'm afraid that your response still leaves me a bit puzzled, however. , Your letter indicates that you would expect there- to be flows of 8,000 cfs in the lower Stanislaus only once or twice per hundred years, at most, and then only for not more than a week or two at a time. I 'm not sure where you gained that impression, or why it remained intact through the planning process for the sewage ponds. If by some chance this is the case, I strongly suggest that you look into the matter. The primary background document for the original authorizing legislation for New Melones , House Document 453, published in 1962, discussed the project ' s ability to control six major floods to 8,000 cfs in the lower Stanislaus . These floods are those that occurred on the Stanislaus from 1907 to 1955. The floods were each limited to a maximum flow of 8,000 cfs in the tower Stanislaus under simulated project conditions, but each reached that level . As you might note,, that is six times in a period of forty-nine years -- and I 'm not even sure that it is a complete list of floods. A more recent piece of information is attached to this tetter. I 've taken it from the Army Corps of Engineers Flood Control Manual , as indicated. The bottom line on the graph shows the expected flows under full or "authorized" operation of New Melones Reservoir, measured at Orange Blossom Bridge. The numbers on the bottom axis of the graph give the t1flow exceedance level)' - the curve, for example, shows that the largest flood that can be controlled' to 8,000 cfs is the 100-year flood. As you can see, flows of 8,000 cfs� are expected to occur much more frequntly as well ., For example, even with the: project in place, flows of 8,000 cfs would be:.expected once in four... years;:;:on the average. Flows of more than 3,000 cfs would be experienced twice in three. years, on the average. Although these measures do not indicate the- duration of the 8,000 cfs flow, it is quite clear that such high flows will'. be' experienced for some period of time much more often than .once .or twice per hundred years.. . •tt 4rentA A4NIN-I%(IS .:. .:. . ,141%4 o14e�-