Downspout Spacing by j7rBzHO0

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									                                        PA- Roof Runoff Management
                                       AWM System Component Design
                                                 Chapter 10



       **note

                   County: Dauphin
           Landowner Name: Farmer John

          Project Description: Ag-Waste, Barn Roof Runoff Control

                Designed By: G. Cerrelli                                       Checked By:
                       Date: 04/07/06                                                Date:

                       Notes:


                                    Precipitation/Peak Runoff Data

Design Storm Frequency (yr) = 10                        (10 or 25-yr, based on practices being protected)

          5-min Rainfall (in) = 0.5                     (0.5 for 10-yr and 0.6 for 25-yr in PA)




       W x L Roof Dimensions from Peak to Drip Edge
                Roof L (ft) = 110
               Roof W (ft) = 40                                             Total Roof Peak Q (cfs) = 0.61
                 Area (ft2) = 4400                                       Peak Q per ft L of roof (cfs) = 0.005556


                                        Gutter Sizing Analysis

          Select Gutter Style : A                       Box Ogee (Galv.)

                                               Gutter Size Options: Choose from 5, 6, or 7 (inch)

                    Select Gutter Size
                             (pick one of above sizes in inches):         5

                    Specify Gutter Slope (fall in inches per foot)
                     CHOOSE FROM A=1/16, B=1/8, or C=1/4 :                A       1/16 in/ft

         Gutter Fall per Downspout Spacing (see below), inches: 2.44

                                Maximum Gutter Capacity (cfs) = 0.22

                   Comment: Peak runoff exceeds gutter capacity. Will require downspouts at multiple
                            locations or select steeper S or select larger gutter size.




                                                  page1 of 23
                                            PA- Roof Runoff Management
                                           AWM System Component Design
                                                     Chapter 10



                        County: Dauphin
                Landowner Name: Farmer John

               Project Description: Ag-Waste, Barn Roof Runoff Control

                     Designed By: G. Cerrelli
                            Date: 04/07/06

                                     Downspout Spacing/Sizing Analysis

          Max Allowable Spacing Between Downspout Locations (ft) = 39

                  Select Spacing Between Downspout Locations (ft)= 39

                      Number of Downspout(s) Locations Required = 3

                              Discharge per Downspout Location (cfs)= 0.22

                                                   Downspouts to Choose From (for 5-inch gutter)
               Material                 Type                 Capacity Each (cfs)       ID No.
                 Galv.    3" Plain Round                              0.15               A1
                 Galv.    3" Corrugated Round                         0.13               A2
                 Galv.    3" Octagonal                                0.13               A3
                 Galv.    3" Corrugated Square                        0.17               A4
                 Galv.    2x3" Plain Rectangular                      0.13               A5
                 Galv.    3x4" Plain Rectangular                      0.26               A6
                 Galv.
                 Galv.
                 Galv.
                 Galv.




                          Select ID No. (from above)
                              A6

                               Downspout Type                                        Capacity Each (cfs)
                 Galv. 3x4" Plain Rectangular                                             0.26

              No. of Downspouts per location                 No. of Downspouts at last location
                           1                                                1

             Materials List for Design Area:
     Gutter: 110 ft of 5-in Box Ogee (Galv.)
Downspouts: 3 @ 3x4" Plain Rectangular(Galv.)




                                                       page2 of 23
 PA- Roof Runoff Management
AWM System Component Design
          Chapter 10




        page3 of 23
                            PA- Roof Runoff Management
                           AWM System Component Design
                                     Chapter 10




Instructions- Input data only in LIGHT
BLUE colored cells. Yellow cells
highlight important design info.




     W


                   L




 A
                                            B            C




                             Gutter Styles/Sizes
                          Available to Choose From




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 PA- Roof Runoff Management
AWM System Component Design
          Chapter 10




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AWM System Component Design
          Chapter 10




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 PA- Roof Runoff Management
AWM System Component Design
          Chapter 10




             Selected K       K for A
             3.045            3.045

                              K for B
                              1.891

                              K for C
                              Must specify size as 6 (inch)




        page7 of 23
 PA- Roof Runoff Management
AWM System Component Design
          Chapter 10




                                Downspouts to Choose From (for 5" gutter)
                       ID No.      Type               Capacity Each (cfs)
                         A1     3" Plain Round          0.15
                         A2     3" Corrugated Round     0.13
                         A3     3" Octagonal            0.13
                         A4     3" Corrugated Square    0.17
                         A5     2x3" Plain Rectangular 0.13
                         A6     3x4" Plain Rectangular 0.26




               Downspouts to Choose From (for 6" gutter)
                       ID No.      Type              Capacity Each (cfs)
                         A7     3" Plain Round         0.16
                         A8     4" Plain Round         0.29
                         A9     3" Corrugated Round    0.14
                        A10     4" Corrugated Round    0.25
                        A11     3" Octagonal           0.14
                        A12     4" Octagonal           0.26
                        A13     3" Corrugated Square   0.18
                        A14     4" Corrugated Square   0.27

                        A15     3x4" Plain Rectangular   0.27
                        A16     4x5" Plain Rectangular   0.46


                                Downspouts to Choose From (for 7" gutter)
                       ID No.      Type             Capacity Each (cfs)
                        A17     4" Plain Round        0.32
                        A18     5" Plain Round         0.5
                        A19     4" Corrugated Round   0.28
                        A20     5" Corrugated Round   0.45



        page8 of 23
 PA- Roof Runoff Management
AWM System Component Design
          Chapter 10



                        A21   4" Octagonal             0.28
                        A22   5" Octagonal             0.45
                        A23   4" Corrugated Square      0.3
                        A24   5" Corrugated Square     0.48
                        A25   4x5" Plain Rectangular   0.51
                        A26   5x6" Plain Rectangular   0.74




        page9 of 23
                        PA- Roof Runoff Management
                       AWM System Component Design
                                 Chapter 10




Gutter Slope (in/ft)
 1/16




                               page10 of 23
                              PA- Roof Runoff Management
                             AWM System Component Design
                                       Chapter 10




hoose From (for 5" gutter)
 Capacity Each (cfs)




 Capacity Each (cfs)




hoose From (for 7" gutter)
 Capacity Each (cfs)




                                     page11 of 23
        **note

                    County: Dauphin
            Landowner Name: Farmer John

           Project Description: Ag-Waste, Barn Roof Runoff Control

                  Designed By: G. Cerrelli                                      Checked By:
                         Date: 04/07/06                                               Date:

                         Notes:


                                   Precipitation/Peak Runoff Data

Design Storm Frequency (yr) = 25                         (10 or 25-yr, based on practices being protected)

           5-min Rainfall (in) = 0.6                     (0.5 for 10-yr and 0.6 for 25-yr in PA)




        W x L Roof Dimensions from Peak to Drip Edge
                 Roof L (ft) = 110
                Roof W (ft) = 40                                             Total Roof Peak Q (cfs) = 0.73
                  Area (ft2) = 4400                                       Peak Q per ft L of roof (cfs) = 0.00666667


                          Gutter Sizing Analysis

Select Gutter Style: A            Box Ogee (Galv.)

                                   Gutter Size Options: Choose from 5, 6, or 7 (inch)
                                                                                          Standard Gutter Fall
        Select Gutter Size                                                            in/ft       ft/ft        %
                  (pick one of above sizes in inches):        6                       1/16     0.005208     0.52%
                                                                                       1/8     0.010417     1.04%
      Specify Maximum Allowable Gutter Fall (inches):         6                        1/4     0.020833     2.08%

           Select Spacing Between Downspouts (ft) =          55      therefore Qdesign (cfs)= 0.37

                    Resulting Gutter Slope (inches/ft): 11/100
                                                    or 0.91%

                     Maximum Gutter Capacity (cfs) = 0.45

        Comment: **** GUTTER SIZE AND DOWNSPOUT SPACING GOOD ****
             County: Dauphin
     Landowner Name: Farmer John

    Project Description: Ag-Waste, Barn Roof Runoff Control

          Designed By: G. Cerrelli
                 Date: 04/07/06

                                     Downspout Spacing/Sizing Analysis

                Selected Spacing Between Downspout Locations (ft)= 55

                      Number of Downspout(s) Locations Required = 2

                              Discharge per Downspout Location (cfs)= 0.37

                                                Downspouts to Choose From (for 6-inch gutter)
               Material                 Type               Capacity Each (cfs)       ID No.
                 Galv.    3" Plain Round                            0.16               A7
                 Galv.    4" Plain Round                            0.29               A8
                 Galv.    3" Corrugated Round                       0.14               A9
                 Galv.    4" Corrugated Round                       0.25              A10
                 Galv.    3" Octagonal                              0.14              A11
                 Galv.    4" Octagonal                              0.26              A12
                 Galv.    3" Corrugated Square                      0.18              A13
                 Galv.    4" Corrugated Square                      0.27              A14
                 Galv.    3x4" Plain Rectangular                    0.27              A15
                 Galv.    4x5" Plain Rectangular                    0.46              A16




                          Select ID No. (from above)
                             A16

                               Downspout Type                                      Capacity Each (cfs)
                 Galv. 4x5" Plain Rectangular                                           0.46

              No. of Downspouts per location               No. of Downspouts at last location
                           1                                              1

            Materials List for Design Area:
    Gutter: 110 ft of 6-in Box Ogee (Galv.)
Downspouts: 2 @ 4x5" Plain Rectangular(Galv.)
        Instructions- Input data only in LIGHT BLUE
        colored cells. Yellow cells highlight
        important design info.




    W


                 L




A                                              B
                                                             C




                                     Gutter Styles/Sizes
                                  Available to Choose From
Selected K   K for A
4.708        4.708

             K for B
             4.699

             K for C
             2.229
                 Downspouts to Choose From (for 5" gutter)
        ID No.      Type               Capacity Each (cfs)
          A1     3" Plain Round          0.15
          A2     3" Corrugated Round     0.13
          A3     3" Octagonal            0.13
          A4     3" Corrugated Square    0.17
          A5     2x3" Plain Rectangular 0.13
          A6     3x4" Plain Rectangular 0.26




Downspouts to Choose From (for 6" gutter)
        ID No.      Type              Capacity Each (cfs)
          A7     3" Plain Round         0.16
          A8     4" Plain Round         0.29
          A9     3" Corrugated Round    0.14
         A10     4" Corrugated Round    0.25
         A11     3" Octagonal           0.14
         A12     4" Octagonal           0.26
         A13     3" Corrugated Square   0.18
         A14     4" Corrugated Square   0.27

         A15     3x4" Plain Rectangular   0.27
         A16     4x5" Plain Rectangular   0.46


                 Downspouts to Choose From (for 7" gutter)
        ID No.      Type              Capacity Each (cfs)
         A17     4" Plain Round         0.32
         A18     5" Plain Round          0.5
         A19     4" Corrugated Round    0.28
         A20     5" Corrugated Round    0.45
         A21     4" Octagonal           0.28
         A22     5" Octagonal           0.45
         A23     4" Corrugated Square    0.3
         A24     5" Corrugated Square   0.48
A25   4x5" Plain Rectangular   0.51
A26   5x6" Plain Rectangular   0.74
Choose From (for 5" gutter)
   Capacity Each (cfs)




   Capacity Each (cfs)




Choose From (for 7" gutter)
   Capacity Each (cfs)
                                                                                                                                                                                                                                                                                                                                                                                                                                                             Actuals Used
                                                                                                                                                                                                                                                                                                                                                                                         Conveyance Value Check
                                                                                                                                                                                                                                                                                                                                                                                                         2
            Gutter Size (in) = 5                                      S (in/ft)      S (ft/ft)    Q (cfs)        K             Downspout Size: 3" Plain Round 4" Plain Round 3" Corrugated Round 4" Corrugated Round 3" Octagonal     4" Octagonal      3" Corrugated Square 4" Corrugated Square 2x3" Plain Rectangular   3x4" Plain Rectangular   Gutter Width(in)   Gutter Depth (in) Est Flow Area(ft ) Est Flow WP(ft)   Est R (ft)   n-value   Est K      avg K
                      Type = Box Ogee (galv)                            1/16         0.005         0.22        3.048   avg K                    capacity (cfs) capacity (cfs)    capacity (cfs)      capacity (cfs)  capacity (cfs)   capacity (cfs)        capacity (cfs)       capacity (cfs)        capacity (cfs)           capacity (cfs)             5                 4.75              0.111             1.075         0.103        0.012    3.008      3.045
                                                                        1/8          0.010         0.31        3.037   3.045                         0.15           n/a              0.13                 n/a            0.13             n/a                   0.17                  n/a                  0.13                     0.26
                                                                        1/4          0.021         0.44        3.048                                  A1                              A2                                  A3                                     A4                                         A5                       A6

            Gutter Size (in) = 6                                      S (in/ft)      S (ft/ft)    Q (cfs)        K
                      Type = Box Ogee (galv)                            1/16         0.005         0.34        4.711   avg K   Downspout Size: 3" Plain Round 4" Plain Round 3" Corrugated Round 4" Corrugated Round 3" Octagonal     4" Octagonal      3" Corrugated Square 4" Corrugated Square 3x4" Plain Rectangular   4x5" Plain Rectangular                                                                                                               avg K
                                                                        1/8          0.010         0.48        4.703   4.708                    capacity (cfs) capacity (cfs)    capacity (cfs)      capacity (cfs)  capacity (cfs)   capacity (cfs)        capacity (cfs)       capacity (cfs)        capacity (cfs)           capacity (cfs)             6                 5.25             0.148              1.222         0.121       0.012     4.505      4.708
                                                                        1/4          0.021         0.68        4.711                                 0.16           0.29             0.14                0.25            0.14             0.26                  0.18                 0.27                  0.27                     0.46
                                                                                                                                                      A7             A8               A9                 A10             A11              A12                    A13                  A14                   A15                      A16

            Gutter Size (in) = 7                                      S (in/ft)      S (ft/ft)    Q (cfs)        K
                      Type = Box Ogee (galv)                            1/16         0.005         0.59        8.175   avg K   Downspout Size: 4" Plain Round 5" Plain Round 4" Corrugated Round 5" Corrugated Round 4" Octagonal     5" Octagonal      4" Corrugated Square 5" Corrugated Square 4x5" Plain Rectangular   5x6" Plain Rectangular                                                                                                               avg K
                                                                        1/8          0.010         0.83        8.132   8.138                    capacity (cfs) capacity (cfs)    capacity (cfs)      capacity (cfs)  capacity (cfs)   capacity (cfs)        capacity (cfs)       capacity (cfs)        capacity (cfs)           capacity (cfs)             7                 6.5              0.219              1.515         0.144       0.012     7.451      8.138
                                                                        1/4          0.021         1.17        8.106                                 0.32           0.5              0.28                0.45            0.28             0.45                   0.3                 0.48                  0.51                     0.74
                                                                                                                                                     A17            A18              A19                 A20             A21              A22                    A23                  A24                   A25                      A26

            Gutter Size (in) = 5                                      S (in/ft)      S (ft/ft)    Q (cfs)        K
                      Type = Box Ogee (alum)                            1/16         0.005         0.14        1.940   avg K   Downspout Size: 3" Plain Round 4" Plain Round 3" Corrugated Round 4" Corrugated Round 3" Octagonal     4" Octagonal      3" Corrugated Square 4" Corrugated Square 2x3" Plain Rectangular   3x4" Plain Rectangular                                                                                                               avg K
                                                                        1/8          0.010         0.19        1.862   1.891                    capacity (cfs) capacity (cfs)    capacity (cfs)      capacity (cfs)  capacity (cfs)   capacity (cfs)        capacity (cfs)       capacity (cfs)        capacity (cfs)           capacity (cfs)             5                 3.5              0.083              0.833         0.100       0.012     2.223      1.891
                                                                        1/4          0.021         0.27        1.871                                 0.13           n/a              0.11                 n/a            0.13             n/a                   0.14                  n/a                  0.11                     0.22
                                                                                                                                                      B1                              B2                                  B3                                     B4                                         B5                       B6

            Gutter Size (in) = 6                                      S (in/ft)      S (ft/ft)    Q (cfs)        K                                                                                                                                                                                                                                                                                                                                              avg K
                      Type = Box Ogee (alum)                            1/16         0.005         0.34        4.711   avg K   Downspout Size: 3" Plain Round 4" Plain Round 3" Corrugated Round 4" Corrugated Round 3" Octagonal     4" Octagonal      3" Corrugated Square 4" Corrugated Square 2x3" Plain Rectangular   3x4" Plain Rectangular          6                 4.75             0.142              1.125         0.126       0.012     4.404      4.699
                                                                        1/8          0.010         0.47        4.605   4.699                    capacity (cfs) capacity (cfs)    capacity (cfs)      capacity (cfs)  capacity (cfs)   capacity (cfs)        capacity (cfs)       capacity (cfs)        capacity (cfs)           capacity (cfs)
                                                                        1/4          0.021         0.69        4.780                                 0.15           0.28             0.13                0.24            0.13             0.23                  0.17                 0.26                  0.13                     0.26
                                                                                                                                                      B7             B8               B9                 B10             B11              B12                    B13                  B14                   B15                      B16

            Gutter Size (in) = 6                                      S (in/ft)      S (ft/ft)    Q (cfs)        K                                                                                                                                                                                                                                                                                                                                              avg K
                      Type = Semi Circle                                1/16         0.005         0.16        2.217   avg K   Downspout Size: 3" Plain Round 4" Plain Round 3" Corrugated Round 4" Corrugated Round 3" Octagonal     4" Octagonal      3" Corrugated Square 4" Corrugated Square 3x4" Plain Rectangular   4x5" Plain Rectangular          6                  3               0.079              0.702         0.112       0.012     2.256      2.229
                                                                        1/8          0.010         0.23        2.254   2.229                    capacity (cfs) capacity (cfs)    capacity (cfs)      capacity (cfs)  capacity (cfs)   capacity (cfs)        capacity (cfs)       capacity (cfs)        capacity (cfs)           capacity (cfs)
                                                                        1/4          0.021         0.32        2.217                                 0.12           0.21              0.1                0.18            0.11             0.19                  0.13                 0.19                   0.2                     0.33
                                                                                                                                                      C1             C2               C3                  C4              C5               C6                    C7                   C8                    C9                       C10



                Downspout Orifice Flow Check
 Shape       L-opening (in)   W- opening (in) Depth- gutter (in)   Orifice Q (cfs)                                                                  10-yr                                                                                 25-yr
                                                                                                                                                                         2                                        2                                                2                                                2
 Round            n/a                3               4.75               0.15                                                                    5-min Rain (in)      cfs/ft      Target Q (cfs)      Roof Area (ft )                  5-min Rain (in)          cfs/ft            Target Q (cfs)        Roof Area (ft )
 Square            3                 3               4.75               0.17                                                                         0.5          0.000138889        0.22                1584                              0.6              0.000166667              0.22                  1320
Rectangle          2                 3               4.75               0.13                                                                                                         0.31                2232                                                                        0.31                  1860
Rectangle          3                 4               4.75               0.25                                                                                                         0.44                3168                                                                        0.44                  2640
 Round            n/a                3               5.25               0.16                                                                                                         0.34                2448                                                                        0.34                  2040
 Round            n/a                4               5.25               0.28                                                                                                         0.48                3456                                                                        0.48                  2880
 Square            3                 3               5.25               0.18                                                                                                         0.68                4896                                                                        0.68                  4080
 Square            4                 4               5.25               0.29              Box Ogee Galvanized                                                                        0.59                4248                                                                        0.59                  3540
Rectangle          3                 4               5.25               0.27                                                                                                         0.83                5976                                                                        0.83                  4980
Rectangle          4                 5               5.25               0.44                                                                                                         1.17                8424                                                                        1.17                  7020
 Round            n/a                4                6.5               0.31                                                                                                         0.14                1008                                                                        0.14                   840
 Round            n/a                5                6.5               0.48                                                                                                         0.19                1368                                                                        0.19                  1140
 Square            4                 4                6.5               0.33                                                                                                         0.27                1944                                                                        0.27                  1620
 Square            5                 5                6.5               0.46                                                                                                         0.34                2448                                                                        0.34                  2040
Rectangle          4                 5                6.5               0.49                                                                                                         0.47                3384                                                                        0.47                  2820
Rectangle          5                 6                6.5               0.74                                                                                                         0.69                4968                                                                        0.69                  4140
 Round            n/a                3                3.5               0.13                                                                                                         0.16                1152                                                                        0.16                   960
 Square            3                 3                3.5               0.15                                                                                                         0.23                1656                                                                        0.23                  1380
Rectangle          2                 3                3.5               0.11                                                                                                         0.32                2304                                                                        0.32                  1920
Rectangle          3                 4                3.5               0.22
 Round            n/a                3               4.75               0.15               Box Ogee Aluminum
 Round            n/a                4               4.75               0.26
 Square            3                 3               4.75               0.17
 Square            4                 4               4.75               0.28
Rectangle          2                 3               4.75               0.13
Rectangle          3                 4               4.75               0.25
 Round            n/a                3                 3                0.12
 Round            n/a                4                 3                0.21
 Square            3                 3                 3                0.14                     Semi Circle
 Square            4                 4                 3                0.22
Rectangle          3                 4                 3                0.20
Rectangle          4                 5                 3                0.33

								
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