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~. Improved public health environment. l6. Road Closures The only cxisting street crossing which is not to be replaced in the master plan is Mariposa Street. The proposed closure has been discussed with the Denver Traffic Department and Parks Department. F. Lower cost open space. G. Improved quality of classificd streams. H. Sources of fill material for use in flood plain areas along the Platte River. I. Development of otherwise undevelopable land. Crossings are not provided for existing dead-end roads. Where feasible, suggested locations for cul-de-sacs or rerouting of dead-end streets and alleys are indicated on the plan for the benefit of traffic engineers. The cost for rerouting or cul-de-sacing existing dead-end streets or alleys is not included in the cost estimate. J. Opportunities for lower building construction costs. 14. Existing Utilities Available information on existing sanitary sewers, storm sewers, water lines, gas lines, and telephone conduits is represented on the mastor plan shoets. Inaccuracies in the available information are inevitable. The proliferation of water and sanitation districts serving the Lakewood area which do not have staffs for updating as-built drawings adds to this problem. In numerous cases, it is evident that sanitary sowcrs must cxist in strccts where they arc not noted on District as-built drawings. In these cases, assumed sewer locations and elevations are indicated on the maps. MAINTENANCE CONSIDERATIONS Sanitary sewers and large water transmission mains have been considered as major design constraints. The majority of smaller utilities are considered as moveable items. The cost of expected utility relocations are inCluded in cost estimates. A primary concern to any urban drainage project is the continued maintenance operations associated with its construction. Main- tenance operatiOns are necessary for any drainage facility. Normally, maintenance costs increase as construction costs decrease. This may not be true in all cases but seems to be the general rule. The City of Milwaukee, Wisconsin has an extensive system of grass lined channels which have been well maintained for many years. Their maintenanoe operation generally consists of mowing of grass and weeds on a regula: basis, reseeding of eroded areas as needed, removal of debr~s on an annual basis and removal of silt as necessary (every two to five years). Their maintenance experience indicates that approximately 1,200 man-hours per mile per year/are required on the open chann~l system. Equipment utilized by this force includes one dump truck, two six foot mowers, three 24 inch self propelled mowers an1 18 dozcn hand gra8~ whips for use by summer s~udcnt help. Field surveys to verify utility locations and elevations must be completed prior to final design of any portion of the project. These figures were obtained from Mr. Ted B. Prawadzik, Chicf Sewer Pesign Engineer, Bureau of Engineers, City of Milwaukee. A basic item of the design criteria for all sections of channel in this study is the continUance of a maintenance access route alone the channel bottoms. Wherever fe<lsible, this access route will take the form of a maintenance road wide enough on which to opera.te motorized equipment. In areas of narrow right- ~ -.... th' m"'~~~~~~~-~ -~~~-- _~..k~ -"-, ~-1" b' ' '0"- ~~~t ()~-..,,~, .., ",..."~~"",,,~~ "'~~~~~ ...v",~~ .,,"'~ v..}: V" ~ _~ ~v_ wide path for foot traffic. In areas where the foot path cannot be constructed, a paved invert will generally be utilized minimizing the amount of maintcnance necessary. IS. Local Storm Drainage Although the master planning of the gulches docs not deal directly with the problems of local storm drainage, con- sideration shall be given to local drainage requirements and constraints wherever possible. The proposed design d"finit~ly do.,,, not "Iolv" illl th" rrohl",m" of local or"inag" in the basins. Inflow from local area side basins were , identified in approximate location and may vary when bas~n" are finally sewered. -'10- -91-