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CITY OF LINO LAKES 1 0/24/94 Standards for Facility Design g Hydrology Major Facilities (Le., Detention Ponds) To provide consistent hydrologic information within the City, standards have been established to guide existing and future hydrologic and hydraulic calculations. All future engineering work done in the City requires that the data will be submitted to the City based on the standards outlined in e Engineering calculations may be done using other methods; however, all - calculations will be checked based on the plan standards. In all conflicts of interest, the City' standards will govern. To aid in consistent submittal of calculation, a developer's guide has been created. A copy of the guide is enclosed in the Users Manual, Appendix C. - Design Methodology The U.S.D.A. Soil Conservation Services (SCS) method shall be the basis for review of all hydrologic studies. Land use will be for ultimate development within the entire watershed contributing to the ponding area. Flow rates from existing land use will be analyzed for the 100 year design storm for reference purposes. Storm Distributions Major storm water facility design shall be based on the U.S.D.A. (SCS) method. Three storms -will be used to determine the minimum building elevation. These are: Design Storms la. For overall watershed planning and rural areas shall be: 100 -year return period, 24 -hour duration, Type I distribution with average soil moisture conditions (AMC 2) or lb. For ponding areas around any urban construction shall be: 100 -year return period, 24-hour duration, Type II distribution with average soil moisture conditions (AMC 2) The Type I may be used if the Type II storm creates a Local Water Management Plan Users Manual SEH NO: LINOL9402.00 Page 13