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<br />II -2. <br /> <br />vicinity of Highway 40 have contorted the passage of the stream from <br />one side of the natural channel to the other. The natural conflu- <br />ence of Lena Gulch and Clear Creek was apparently once in the vici- <br />nity of 42nd and Kipling Street. It has now been moved 2000 feet <br />further downstream. Those al ignments shown by the historic topo- <br />graphical mapping are indicated on Sheet No. J of Volume 2. <br /> <br />The four principal governmental entities which control portions of <br />Lena Gulch and participate directly in this plan development are <br />Golden,Wheat Ridge, Lakewood and Jefferson County. The ,.ppro- <br />priate boundaries as well as Camp George West are shown on Drawing <br />No. I. Table 1/-1 summarizes the tributary areas of Lena Gulch <br />which are within the boundaries of each entity. <br /> <br />TABLE 11-1 <br />Lena Gulch <br />Tributary Area of Governmental Entities <br /> <br />Entity <br /> <br />Areas <br />(SquareMil es) <br /> <br />City of Golden <br />City of Lakewood <br />Jefferson County <br />City of Wheat Ridge <br />Camp George West (U. S. Government) <br /> <br />1.42 <br />2.07 <br />7.59 <br />1.82 <br />.94 <br /> <br />Total <br /> <br />13.84 square miles <br /> <br />The various entities provided the information necessary to help pro- <br />ject what the future development and urbanization effects on runoff <br />hydrology would be. This information ,Ias in the form of zoning and <br />planning maps and proved to be essential for the projections of al- <br />terations in impervious areas and soil conditions. <br /> <br />Rei iable hydrology also requires a basic understanding of the abi- <br />lity of the soil to absorb rainfall (infiltration rate). The <br />Infiltration Study basically consisted of field tests that were <br />located in such a way to sample various physical locations, soi I <br />types and changes in soil condition witn urbanization. The loca- <br />tions selected for the infiltration studies were based upon field <br />trips and a review of U. S. Geological Survey maps prepared for <br />the area. The infi ltration rates experimentally obtained wel"e then <br />proportioned according to present and future land usage patterns. <br />The basic data and test locations are documented in the Hydroloqic <br />Appendix. <br />