Public works . nspections of water containers, gut-ters, tanks, troughs and similar possible breeding places andtheir elimination as mosquito producers. This work may becombined with the general sanitary inspections already regu-larly carried on by many city health departments. It is withthe first mentioned kinds of work that this article will dealmainly. Before starting the work, a complete survey should bemade of the area to be drained and the results of this survey,with data as to the importance of the breeding places found,should form the basis of the plan. In the case of the city,sufficie
Public works . nspections of water containers, gut-ters, tanks, troughs and similar possible breeding places andtheir elimination as mosquito producers. This work may becombined with the general sanitary inspections already regu-larly carried on by many city health departments. It is withthe first mentioned kinds of work that this article will dealmainly. Before starting the work, a complete survey should bemade of the area to be drained and the results of this survey,with data as to the importance of the breeding places found,should form the basis of the plan. In the case of the city,sufficient maps and surveys may be available for the prelim-inary work, when supplemented by a thorough inspection ofthe ground, so that a comprehensive scheme of work may out at once. A map drawn to a large scale—400 to 600feet to the inch—is a practical necessity. Completed work maybe plotted on this map or on blue-prints or tracings made fromit, thus giving a graphical record of the progress of the ENDEMIC AREAS OF MAX<ARL\ IN THE UNITED STATES. Shaded Circles Represent Localities in Which Cases of MalariaOccur and in Which the Disease is Probably Endemic. October 18, 1919 MUNICIPAL JOURNAL AND PUBLIC WORKS 237 DRAINAGE The actual work of mosquito control is simple in mostcases. In the construction of ditches, slopes should be suchthat, while there will be no standing water when the flow issmall, the velocity, when they are running full, will not be sogreat as to cause erosion; curves of large radius should beused where possible; the section should be such as to minimizeflood damage or choking from weed growths. Other work willinclude the cleaning of roadside ditches; lowering and cleaningculverts; ditching springs and seepage areas; cleaning anddenuding pond and lake edges; cleaning and training streams;and filling low places. Ditches for drainage work should not be too large, forthis increases both first cost and maintenance. It should beborne in mind that ei
Size: 1980px × 1263px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
