CTC 450 Review 1  WW Characteristics. Objectives 2  Understand the basics of storm drainage systems  Understand the basics of sewer systems.

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Presentation transcript:

CTC 450 Review 1  WW Characteristics

Objectives 2  Understand the basics of storm drainage systems  Understand the basics of sewer systems

Storm Sewer System 3  Surface waters enter system through inlets  Water is then conveyed through pipes and manholes  Quantity of runoff is determined using the rational method (Q=CIA)  Velocities designed for 3-10 fps

Sanitary Sewer System 4  Laterals collect wastewaters to branch lines which are conveyed to large mains (also called trunks or outfall sewer)  Force main has WW conveyed under pressure via pumps  Sanitary sewers are placed deep enough to prevent freezing

Differences between Storm/Sewer  Storm systems are designed to overflow periodically (frequency)  Sewer systems are designed to contain all the wastewater; if surcharging occurs it’s usually a result of infiltration of stormwater  Stormwater pipes are much bigger than sewer pipes

Example  What is the maximum population that can be served by an 8” sanitary sewer laid at minimum grade using a design flow of 400 gpcd & a flowing full velocity=2 ft/sec?  From Table 10-1 Q=310 min. slope (full- flow)  310 gpm / 400 gpcd (and adjust for units)  =1100 people (approx. 275 houses)

Example 10-1 (Continued) 7  Compute the diameter of storm drain to serve the same population based on the following:  30 people/acre; C=0.4, 10-yr frequency w/ IDF curve on page 123, tc=20 min, vel=5 ft/sec  Area=37 acres  Intensity=4.2”  Q=62 cfs  Assuming full-flow; Area=12.4 square ft  Diameter=4 ft

Manholes 8  Usually circular with an inside diameter of 4 feet  Placed at all changes in sewer grade, pipe size, or alignments changes (horiz. & vertical)  Also placed at all intersections, at the end of each line, and at distances not greater than 400 ft ( 15”)

Other Decorative Manholes  ese-manhole-cover-art.html ese-manhole-cover-art.html

Surcharged Manholes   

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Service Connections 12  House service pipe is connected to the collecting sewer  Traps prevent backup of sewer gases into the building interior  Building vents prevent traps from being siphoned dry

Sewer Pipes and Jointing 13  Vitrified clay, PVC, or precast concrete may be used  DIP (ductile iron pipe) is used for force mains

Clay Pipe ( 14

PVC Pipe ( 15

Concrete Pipe ( ) 16

Ductile Iron Pipe ( 17

Load on Buried Pipe  Loading on pipe must be considered  Common types of bedding are shown on page

Pipe Joints 19

Joints product/sanitite.html product/sanitite.html 20

Sewer Testing 21  Monitor infiltration (before connections)  Only works if pipe is below water line  Monitor exfiltration  Used if pipe above water line  Air testing

Lift (Pump) Stations 22  Pumping stations used when gravity flow not feasible  Avoid if possible because a nonfunctional lift station means that sewage water can back up into houses/businesses  Pumps can be installed in the wet well or kept separate from the wet well

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