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Minutes of Hastings Planning Commission Meeting held Monday, May 25, 1970 Page 2. The next item of discussion was the South Area Air Port. There was a brief review of the meeting of May Zl~, 1970 which the Dakota County Development Corporation sponsored and at that meeting Mr. Greggs, Vice-President of Northwest Airlines gave a report on their position. It was suggested that the City Engineer contact the Metropolitan Council and secure any inform- at/on available in regard to facts of the Air Port sites, South Area versus the Ham Lake site. Under Committee Reports, the committee on Mobile Home Parks headed by Councilman Fischer, stated that they had made no determination at this time in their study, they were awaiting legislative tax study information and also the outcome of the Vermillion River watershed study before they make any recommendations to the Planning Commission. The committee reported on the shopping center and apartment complex. Mr. Leonard Bauer indicated they were having a meeting on Wednesday, May 27th in this regard and could give no report at this time. The next item of discussion was the Vermillion River Flood Project as pre- sented by the Corps of Engineers at the last regular Council Meeting of May 18th. It was suggested the engineer contact the Corps of Engineers, determine what population projections were used for flood projection in obtaining the 100 year flood curves, if in fact, ponds and possible dams could be incorporated in the construction program. Note: I called the Corps of Engineers today and talked to Mr. Bill Pearson who stated they did no detailed population study for the watershed, however they did determine there were 195 square miles in the Vermillion River watershed and instead of using the actual 60% runoff coefficient from the area they used 100% contribution of the entire 195 square miles which would allow for some urbanization and full development of the watershed. He did want to stress that the 1965 flood was not, and should not be construed to be a 100 year flood, that the projections the Corps of Engineers is using is a 100 year frequency flood curve based on rainfall data which could easily exceed the 1965 Spring melt flooding that occured that year. He also stated that the Colonel was responding immediately to Mr. Fischer's questions by written confirmation and ail of this information would be contained in the report to Mr. Fischer. He also stated that the damage figures given at the hearing is obtained by their Economics Studies staff, where they take valuation of houses in the area, and elevations of the first flood in the flood plain. Each house in the flood plain is evaluated, these are generalized curves which have proven to be very accurate in the past as to possible damage that could occur should a 100 year flood actually occur. All businesses within the floodplain area are actually interviewed and determined what their total business losses would be for the duration of the flood. In 1965 the damage could have been $725,000 and would be increased in accordance with price cost indexes and then discounted by the affect of the levy and bridge construction which has already taken place. On this basis, today's damage could exceed one million dollars.