Table 7-6.Minimum Slope for Sewer Pipe

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size  of  pipe  to  select.  One  example  is  table  7-7; it  shows  storm  drain  sizes.  Remember  that  this table is to be used only as a guide when estimating for  storm  drainage,  as  different  areas  have different  intensities  of  rainstorms. Another   method   for   sizing   building   storm drains is to provide 1 square inch of pipe cross- sectional  area  for  each  100  square  feet  of  roof area. This method is easy to remember: 1 square inch  for  100  square  feet.  (However,  it  is  not  as accurate as using table 7-7.) Using this method, you can prepare a table similar to table 7-8. Show the diameter in the first column; then the radius (which is one-half the diameter); then the square of the radius; then the cross-sectional area, which is pi (3.14) times the radius squared. Since each square  inch  may  take  100  square  feet  of  roof, move the decimal of the square inches over two places to the left (which is multiplying by 100) to get  the  area  of  the  roof  that  may  be  drained  to the pipe. As you can see by comparing table 7-7 with table 7-8, the second method is much more conservative. Sizing Site Storm Sewers While  rules  of  thumb  such  as  those  just described are used to size building storm drains, different  procedures  are  used  to  size  the  storm sewers  that  carry  the  runoff  from  the  building  site and   surrounding   land   areas.   The   design   and sizing of storm drains are provided by engineers. It  is  not  necessary  that  the  UT  understand  the factors  that  contribute  to  the  design.  Therefore, the   information   is   not   included   here. WATER  SUPPLY  SYSTEMS After the pipe runs and fittings are located on a  print  or  drawing,  the  size,  quantity,  and joining  requirements  of  the  pipe  must  be  deter- mined.  When  a  plumbing  print  is  available  for  the job,  it  will  contain  this  information.  If  there  is no blueprint, you must determine these require- ments  yourself.  The  quantity  of  pipe  required  and the number and types of fittings you intend to use Table  7-8.—Fixture  Demand Table 7-7.—Size of Horizontal Building Storm Drains and Building Storm Sewers 7-10

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