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<br />In general, most of the soils within the Big Dry Creck Basin <br /> <br /> <br />have a significant clay content with a high swelling potential and <br /> <br /> <br />therefore, a high runoff rate. DOll' those soils in the immediate <br /> <br /> <br />area of the channel have a sandy soil with greater permeahility. <br /> <br /> <br />Since this area of the total basin is relatively small, the basin ]11 <br /> <br /> <br />general under present developed conditions can he expected to have <br /> <br /> <br />more tlJan normal runoff. Section III contains a discussion of the <br /> <br /> <br />infiltration rates used in the fillal runo[r calculations. <br /> <br />B.) IlE~JlJ SoiL~ <br /> <br /> <br />Four types of soils associations [soils having a distinctive <br /> <br /> <br />proportional pattern of similar soils) have been identified in the <br /> <br /> <br />Big Dry Creek watershed basin. An cnnumeration of these types and <br /> <br /> <br />a brief discussion of each follows: <br /> <br /> <br />(See Plate No.5, Volume 2.) <br /> <br /> <br />1. Alluvial Land-Nunn Associatiop: deep, nearly level, mainly <br /> <br /> <br />loamy and sandy soils; on flood plains and terraces. <br /> <br /> <br />This soil association occurs in the lower reaches of the Big <br /> <br /> <br />Dry Creek Basin, generally from South Broadway Avenue to the conflu- <br /> <br /> <br />ence with the South Platte River. Much of this soil is subject to <br /> <br /> <br />periodical flooding and erosion. This soil association is composed <br /> <br /> <br />mainly of loamy alluvial soils (recently deposited loam and sanely <br /> <br /> <br />loam), Nunn soils (on terraces, loamy surface layer underlain hl' a <br /> <br /> <br />cl:]y or clay loam subsoil), and other minor soils. <br /> <br />-JS- <br />