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~. Improved public health environment. 16. Road Closure" The only existing 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 classified 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 master plan sheets. Inaccuracies in the available information are inevitable. The prolife~ation 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 sewe~s must exist in streets where they arc not noted on Dist~ict as-built drawings. In these cases, assumed sewer locations and elevations are indicated on the maps. MAINTENANCE CONSIDERATIONS Sanita~y 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 channel system. Equipment utilized by this force includes one dump truck, two six foot mowers, three 24 inch self propelled mowers an1 18 dozen hand grass whips for USE by summer s~udent 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, Chief Sewer Design 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 alonc the channel bottoms. Wherever fe<lsible, this access route will take the form of a maintenance road wide enough on which to operate motorized equipment. In areas of narrow right- ~ -.... th- m"'~~~~~~~-~ -~~~-- _~..k~ -"-, ~-l" 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 maintenance 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 d,-..,,, l10t ",olv!> illl th" f'Tohlpm., of local dr"inagp in the basins. Inflow from local area side basins were . identified in approximate location and may vary when bas~ns are finally sewered. -'10- -91-