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<br />VII -6 <br /> <br />are to the developer, the bui Idin9 owner, and to the publ ic. The <br />values would not be estimable without a detailed study and would be <br />sim; lar for all alternatives. <br /> <br />2. Reduced Street Maintenance. It ie; recognized in highway engineering <br />that poor surface drainage and hi9h ground water tables are enemies <br />of good pavements. The same is true of urban streets. Potholes, <br />alligators, cracks, and similar distress in pavement surfaces can <br />often be traced to poor drianage, both surface and subsurface. <br /> <br />Besides roads near the major drainage system, probable road con- <br />ditions throughout the basin wi 11 improve because of a clearer out- <br />fall for the initial drainage systems" This figure is not dis- <br />tinguishable because of the complexities and relative causes of <br />street deterioriation. <br /> <br />3. ~roved Traffic Movement. A rainstorm in Denve,- often signals an <br />early exodus from places of business by the employees because they <br />know that traffic movement will be slow. A wet motor in one auto <br />can stall a long line of traffic. <br /> <br />Ponding of water on the streets and at intersections slows traffic, <br />and often reduces a four-lane arterial quite effectively to a two- <br />lane street from the traffic standpoint. <br /> <br />The Lena Gulch channel work and subsequ€mt local drainage improvements <br />wi 11 result in much improved traffic 'covemenl: during stom runoff <br />periods. Dollar values for this secondary benefit were not included <br />in the evaluation of the alternatives. These benefits, however, do <br />not vary significantly from alternative to alternative and would not <br />significantly change our basic conclusl~,s. <br /> <br />4. Public Health Benefits. Public health and welfare is a prime consid- <br />eration when evaluating the advantages and disadvantages of a good <br />storm drainage system. The type of public health benefits include <br />consideration of pest and insect control. Furthermore, it Is well <br />established that storm runoff water, particularly following the initial <br />flush-down of gutters and streets, Is rathe,- highly polluted. The pol- <br />lution consists of coliform organisms, suspended organic solids, and <br />settleable solids. It is evident that standing water, because of poor <br />drainage, can have an adverse effect upon public health because of <br />these pollutants. <br /> <br />For all alternatives, public health wi;; be improved fairly uniformly. <br />This type of benefit was not claimed for the same reasons elaborated <br />upon for the improved traffic movement benefits. <br />