You must lay out the sanitary sewer system for a new subdivision. You have been given the road…
You must lay out the sanitary sewer system for a new subdivision. You have been given the road layout and topographic map shown in the figure. Lay out the sewer system by drawing each pipe with an arrow beside each gravity pipe showing the direction of flow. Make sure that all gravity sewers flow downhill. If you must pump, show the pump station and use a dashed line to show the force main. Some considerations for design:
• Keep the sewers in the road as much as possible
• Minimize the use of pump stations and force mains
• House laterals must drain to the front of the house
• New sewers must end at the existing sewer in the southwest corner of the map.
It is suggested that you photocopy the attached map and draw the lines in color. An important feature in this design is a greenbelt along a stream in the development. The land developer wants you to create two sets of plans:
a. The first set is for the existing land-use ordinances, which allow sewers to cross a greenbelt but not run along the greenbelt.
b. The second set of plans is for use if the developer receives a variance from the zoning ordinance enabling him to locate the sewer along the length of the greenbelt.
[Zoning ordinances are laws that restrict the construction activities that can occur in each zone. Land owners can request variances which enable them to not comply with a provision in an ordinance.]