|
NOTE: THIS IS A REPRODUCTION OF TABLE I, APPENDIX A,
<br />"DESIGN CHARTS FOR OPEN CHANNEL FLOW' (EDS #3)
<br />Marmiag's
<br />Closed conduits:
<br />a r.ww
<br />A. Concrete pipe----------- --- -- --- ----- ---- ------- --------
<br />0.011 -0.013
<br />B. Corrugated -metal Pipe m pt
<br />2. Trowel flnlsh-----------------------------------------
<br />1. 435 by 34 h1 corrugation iveted pipe):'
<br />IL. Plain or fully coated- - ----------------------------
<br />0. ON
<br />b. Paved invert (range values are for 25 and 50 percent
<br />4. Float flnisb, some gravel on bottom____________ ___ ___
<br />of circumference paved):
<br />S. Gunite, good section ---------------------------------
<br />..(1) Flow full depth --------------------------------
<br />0.0:1 -0.018
<br />(2) Flow 0.8 depth ---------------------- - --------
<br />0.0:1-0.016
<br />(3) Flow 0.6 depth________
<br />0.014.0.013
<br />0.03
<br />2. 6 by tin- corrugation (field bolted) ----- ---------- --
<br />C. VltrfSad clay pipe------- ------ ------ ---- ------- -- -- ----
<br />0.012-0.014
<br />D. Cast -iron pipe, uncoated ----------------------- - - - - -- --
<br />0.013
<br />E. Steel pipe -----------------------------------------------
<br />0.0(9-0.011
<br />F. Brick-------------------- ---- -- ----------------------- --
<br />0.014-0.017
<br />G. Monolithic concrete:
<br />1. Wood forms, rough -----------------------------------
<br />0.015-0.017
<br />2. Wood fortes, smooth - - ------------------------------
<br />0.012 -0.014
<br />3. Steel forms -------------------------------------------
<br />0 -012 -0.013
<br />H. Cemented rubble masonry walls:
<br />3. Dry rubble ( riprap) -- ------------- -------------- -----
<br />1. Concrete floor and top ---------------------- -- - -----
<br />0.017 -0.027
<br />2. Natural floor---------- ----------- ------ --- -----------
<br />0.010-0.023
<br />I. Laminated treated wood -- ----------- ----- --- --- -- ------
<br />0.015 -0.011
<br />J. Vitrified clay liner plates . -- ----------------------------
<br />0.014
<br />II. Open channels, lined s (straight alinement):
<br />A. Concrete, with surfaces w indicated:
<br />A. tb of flow np to 0.7 foot: n range =
<br />1, ermudagrass, Kentucky bluegrass, baffelograss:
<br />Moweedd to 2 inches --- --------- --- --- - - ---- 0.07 -0.043
<br />1. Formed, no finish----- -------------------------- -----
<br />0.0134.017
<br />2. Trowel flnlsh-----------------------------------------
<br />0.012 -0.014
<br />3. Float finish ------------------------------------------
<br />0.0134.013
<br />4. Float flnisb, some gravel on bottom____________ ___ ___
<br />0.015-0.017
<br />S. Gunite, good section ---------------------------------
<br />0.018 -0.019
<br />6. Ounite, wavy s ecti on_ __ ________ ___ _______ ___ ________
<br />0.0113-0.022
<br />B. Concrete, bottom float finished, sides as indicated:
<br />0.OZI -0.025
<br />1. Dressed stone in mortar ---------------------------- --
<br />0.015 -0.017
<br />2. Random stone In mortar --------------------------- --
<br />0.017 -0.020
<br />3. Cement rubble masonry -----------------------------
<br />0.02)-0.025
<br />4. Cement rubble masonry, plastered_____________ ______
<br />0.0115 -0.020
<br />5. Dry rubble ( r1Pmp) ----------------------------------
<br />0 OW -0 . 031)
<br />C. Gravel bottom, sides as indicated:
<br />0.02£ -0.033
<br />1. Formed concrete______ ____ ___________________________
<br />0- 01'1 -0.040
<br />2. Random stone In mort ar------------ -----------------
<br />0.027?-0.023
<br />3. Dry rubble ( riprap) -- ------------- -------------- -----
<br />0- 021-0.033
<br />D. Brick------------------ ------ ----------------------- --
<br />0.01.1-0.017
<br />E. Aspbalt:
<br />0.013
<br />1 . Smootb---------------------------------------------_
<br />2. Rough -----------------------------------------------
<br />0.016
<br />F. Wood, planed dean ------------------------------------
<br />G. Concrete -line3 excavated rock:
<br />0.01:1 -0.013
<br />1. Good section -----------------------------------------
<br />0.017 -0.020
<br />2. Irregular section------- --- ------- ------ ------ --- - - ----
<br />0.OZ:- 0.0277
<br />M. Open channels, excavated' (straight alinement,' natural
<br />lining):
<br />A. tb of flow np to 0.7 foot: n range =
<br />1, ermudagrass, Kentucky bluegrass, baffelograss:
<br />Moweedd to 2 inches --- --------- --- --- - - ---- 0.07 -0.043
<br />A. Earth. uniform section:
<br />0.09 -0.05
<br />1. Clean, recently completed ___ ___ ____ ___ _______________
<br />0.01(:-0.018
<br />2. -Clean, after weathering ------------------------------
<br />0.018 -0.020
<br />3. With abort gram, few weeds---------- ------------ -- --
<br />0.02: -0.027
<br />4. In gravelly soil, uniform section, clean- ---------------
<br />0.OZ! -0.025
<br />B. Earth, fairly uniform section:
<br />1. No vegetation--------- ------------------- ----- -------
<br />0.OZI -0.025
<br />2 Orem, some weeds---- -------------------------------
<br />0.02.-0.030
<br />3. Dense weeds or aquatic plants in deal) channels__ ------
<br />0.0300.036
<br />4. Sides clean, gravel bottom - -- -- -------------- ------- --
<br />0.02! -0.030
<br />5. Sides clean, cobble bottom ---------------------------
<br />0.030 -0.040
<br />C. Dragline excavated or dredged:
<br />0.17 -0.09
<br />1. No vegetation-------- ---- ------ ---- --------- ------- --
<br />0.02£ -0.033
<br />2. Light brush on banks --------------------------------
<br />0.035 -0.050
<br />D. Rock:
<br />0.018
<br />1. Based on design s action__ ____ ______ ____________ ______
<br />0.036
<br />2. Based on actual mean section:
<br />0.018
<br />0.015
<br />a. Smooth and uniform----- ---------------- -------
<br />0 -035 -0.040
<br />b. Jaed and irregular -------------------------------
<br />gg
<br />0.040 -0.045
<br />E. Channels not maintained, weeds and brush uncut:
<br />0.016
<br />1. Dense weeds, high as flow depth___________ __ ________
<br />0.06 -0.12
<br />2. Clean bottom, brush on sides __ ______________________
<br />0.05.0.08
<br />3. Clean bottom brush on sides, highest stage of flow___
<br />0.070.11
<br />4. Dense brush, Ngb step------ ------------ ------ - - - - --
<br />0.10 -0.14
<br />IV. Highway channels and swales with saiaf hovel vegetation #I
<br />values abosva are tar velocitiess of 2 and 6 Lp.a): M , 1
<br />A. tb of flow np to 0.7 foot: n range =
<br />1, ermudagrass, Kentucky bluegrass, baffelograss:
<br />Moweedd to 2 inches --- --------- --- --- - - ---- 0.07 -0.043
<br />t - -------
<br />b. Length 4-0 inches-- ----------- ------ -------- -- ----
<br />0.09 -0.05
<br />2. Good stand, any grew:
<br />a. Length about 12 inches ---------------------- --- - --
<br />0.78 -0.09
<br />b. Length about 24 inches -- ------------ --------- -----
<br />0.30-0.15
<br />3. Fair stand, any grass:
<br />a. Length about 12 Inches -------------- ---------- ----
<br />0.14-0 .08
<br />b. Length about 24 inches - ------------- --- ---- --- ---
<br />0.25 -0.13
<br />B. Depth of flow 0.7 -1.5 feet:
<br />bluegrass, buffalogtass:
<br />1. Bermudagrass, Kentucky
<br />2 inches
<br />0.05-0.036
<br />a. Moweedd to --------------------------------
<br />b. Length 4 to 6 inches - --- ------ ------- --- --- -- - -- - --
<br />0.08-0.04
<br />2. Good stand, any grass:
<br />IL Length about 12 inches __________________ ____ ______
<br />0.12-0.07
<br />b. Length abort 24 Inches ----------------------------
<br />0.2D -0.10
<br />3. Fair stand, any grass:
<br />s. Lengtb about 12 inches -- ----------------- ---------
<br />0.10-0.08
<br />b. Length about 24 inches ----------------------------
<br />0.17 -0.09
<br />V. Street and exprewway Ntteri:
<br />A. Concrete gutter, troweled finish---- ------- --------------
<br />0.012
<br />B. Asphalt pavement:
<br />0.013
<br />1. Smooth texture-------------------------------- - - - ---
<br />0.018
<br />2. Rough texture-------- ------- ---- ------------- - ------
<br />C. Concrete gutter with asphalt pavement:
<br />I. smooth-------------- -- ---- ---- ------------------ ---
<br />0.018
<br />0.015
<br />2. Rough----------------- ------------- -------------- ---
<br />D. Concrete pavement:
<br />0.014
<br />1. Float flubb----------- ------ -- --- -------- -- ----------
<br />2. Broom finish------ -- -- ---- -- ---------------------
<br />0.016
<br />E. For gutters with small slope, where sediment may accu-
<br />mulate, increase above values of a by----- -- --- -------
<br />0
<br />VL Natural stream channels:'
<br />A. Minor streams s (surface width at flood stage less than 100
<br />ft.):
<br />1. Fairly regular section:
<br />a. Some grass and weeds, little or no brash -----------
<br />0 .0304-035
<br />b. Dense growth of weeds, depth of flow materially
<br />ggrfeater than weed height ----- --- ---- ----- --- -- -- --
<br />Cme brush banks---------
<br />0.035 -0.05
<br />0.035 -0.05
<br />C. weeds, light on ----- - --
<br />d. Some weeds, heavy brush on banks----- ------- ---
<br />0.05-0.07
<br />e. Some weeds, dense willows on banks__ __________ _
<br />0.08-0.08
<br />L For trees within channel, with branches submerged
<br />at high stage, increase all above values by -------
<br />0. Of -0.09
<br />2 Irregular sections, with pools, slight channel meander;
<br />increase values given In Is-e about -----------------
<br />0.01 -0.Of
<br />3. Mountain streams, no vegetation in channel, banks
<br />trees and brush along banks sub-
<br />usually steep
<br />merged at higli stage:
<br />a. Bottom of gravel, cobbles, and few boulders_______
<br />0.04-0.05®
<br />b. Bottom of cobbles, with large boulders____________
<br />0.05 -0.07
<br />B. Flood plains (adjacent to natural streams):
<br />-1. Pasture, no brush:
<br />a. Short gram--------- ----- ---- ---- ----- ----------- --
<br />0.030 -0.035
<br />b. High gram-------- --------- -- ---------------- - ----
<br />0.035 -0.05
<br />2. Cultivated areas:
<br />0.03-0.04
<br />s. No crop----------- --- --- --------- ----- ------- -----
<br />b. Mature row crops - ---------------- ------- --- - ----
<br />0.035 -0.045
<br />c. Mature field crops--- ------- --- ------------- -- -- --
<br />0.04-0.05
<br />3. Heavy weeds, scattered brush----------- ----- --------
<br />0.05 -0.07
<br />4. Light brush and trees: rs
<br />0.05-0.06
<br />s. Winter - ------------------------------------------
<br />- b.. Summer----------- ---- ---------- ----------- - - ----
<br />0.06-0.06
<br />S. Medium to dense brush: is
<br />a. Winter------------- -------------------- -----------
<br />0.07-0.11
<br />b. Summer ----- ---- ------ ------- ----------- ----
<br />6. Dense willows, summer, not bent over by current____
<br />0.10-0.16
<br />• 0.15 -0.20
<br />7. Cleared land with tree stumps, 100 -150 per acre:
<br />a. No sprouts-------- ------ -------------- ----- ------
<br />0.04-0.05
<br />b. With heavy growth of sprouts --------- -------- --
<br />0.08 -0.08
<br />8. Heavy stand of timber, a few down trees, little under-
<br />growth.
<br />a. Flood depth below branches-- ------- ------ ---- - --
<br />0.10-0.12
<br />b. Flood depth roaches branches_____ _____ _ _ ____ __
<br />0.12 -0.16
<br />C. Major streams (surface width at flood stage more than
<br />100 ft.): Roughness coefficient is usually less than for
<br />minor streams of similar description on account of less
<br />effective resistance offered by irregular banks or vege-
<br />tation on banks. Values of n may be somewhat re-
<br />duced. Follow recommendation in publication cited r
<br />if possible. The value of a for larger streams of most
<br />regular section, with no boulders or brush, may be in the
<br />range oL--------------- --------- ----- --------------- --
<br />0.026 -0.033
<br />TYPICAL MANNING BASE "m" VALUES
<br />TABLE 7 -1 ai"
<br />F -4 DEC 1994
<br />
|