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<br />I, <br />~ <br /> <br />~: <br />~ <br />! <br />! <br /> <br />In addition to variations in duration and depth of rainfall ! <br />in this region, intensity of precipitation is a consideration . <br />because of the influence of the highly variable topography <br />encompassed in the study area. The portions of Teller and El <br />Paso County lying easterly of the 8,000 foot elevation contour ! <br />are primarily affected by thunderstorm events. The westerly <br />portions typically experience less intense storms. The Soil <br />Conservation Service has developed three storm types from NOAA I <br />data; Type I, II and IIA. Type I is not applicable to any of __ <br />the area in Colorado. Type IrA is assumed to be typical or- --- --- ,,' <br />thunderstorm type precipitation events and is used east of the I <br />8,000 foot elevation contour. Type II is assumed to be a <br />general type storm and will be applied to those areas lying b <br />west of the 8,000 foot elevation contour in the study area. <br />The effects of the increased intensity from Type IIA storms I <br />is discussed in Section III-RUNOFF. C <br /> <br /> <br />~ <br />! <br />~ <br /> <br />-.....- <br /> <br />~ <br />~i <br />IiV <br />I <br />~. <br /> <br />I:, <br />" <br /> <br />~r, <br /> <br />duration curves are utilized, they are applicable to a relatively <br />limited area surrounding the point at which the original data <br />was acquired. Should a statistically significant sample of data <br />be available for other areas in the reg~on, depth-duration curves <br />can be developed for other locations. These figures gtve_point- <br />rainfall only. Average rainfall over a basin will be less <br />depending on the total area. Figur_e'n'iJl containi5-'-:-adt!l..stllle.~ <br />factors.,to. account. for:. bas.in_ar,e.asl For durations and/or <br />frequencies not contained in this Manual, reference is made to <br />NOAA Atlas 2, Vol. III, Colorado 1973. <br /> <br />4 <br />