Uploader Agreement. This means that the embankment rises one unit for each 2 units that it goes sideways, e.g., 10 cm up for every 20 cm out, or 50 cm vertical rise for each 100 cm horizontal displacement. given in Figures 5-9 and 5-10, as a function of particle size. Table 5-7 lists
Many grasses can be used for permanent vegetal channel
5 inches deep) on moderate slopes with a straight disk, or broadcast along with
permissible shear stress: 1.75 lbs/ft2 (84.0 Pa), S150BN straw erosion control blanket
Basic allowable
4-5 Silt Theories and Design OF Irrigation Canals Design of irrigation canals means determining of their various hydraulic dimensions, such as, bed width (B), fully supply depth (y), side slopes and shape of section and bed slope(S). time variability of vegetation cover conditions is accounted for in the
the increased flow resistance due to mature vegetation. also comes under this category. 1588, pp. Enge1m. The use of the depth–slope product — in computing the bed shear-stress — specifically refers to two assumptions that are widely applicable to natural river channels: that the angle of the channel from horizontal is small enough that it can be approximated as the slope by the small-angle formula, and that the channel is much wider than it is deep, and sidewall effects can be ignored. When newly placed, with no vegetation growth, the Mannings n roughness is
Using the Mannings equation and the VenTe Chow (1959)
index (CI) which describes the potential of the vegetal cover to
of Engineers Channel Stability Assessment Method Report: Engineering and Design
Figure 5-10. This
Typical side slopes for different canal materials are discussed in Section 4.2.3. F.S.L. Basic allowable
an increase in velocity of 0.5 ft/sec can be added to these
Smithii Rydb.). classification and plasticity index. (good uniform stands). direction. In addition to the grass species or base mixture of grasses used for
Raudkivi, A.
using turf reinforcement mats (TRM) must consider three phases: (1) the
This value is therefore: 1.38/73.14 = 0.018. matting) www.Gardnerturf.com, Conwed fibers (mulch and blankets) www.conwedfibers.com 1-800-366-1180, Soil Guard (bonded fiber matrix mulch) www.soilguard.com, Soil Moist (soil erosion polymer) www.soilmoist.com, Applied Polymer Systems
The cover
certain cultivated sorghums other than sudangrass, may also be useful for
Fortier, S. and
Design of canals in alluvial soils. aggressively as sorghums after mowing, they may leave a more desirable,
These parameters are illustrated in Figure 5-13 (North
In such a section the bed level of the canal lies at the G.L. Assume a 0.25 acre hillside, as shown below, having a slope
(1987) states that a reasonable tolerance limit to allow agricultural activity
Elevation of Canal Bed = 102 mElevation of Canal Bottom = 104 mThus Change in Elevation = 104 - 102 = 2 mThus Bottom S… 1. the sheet flow roughness coefficient for the slope surface, and. fall. be calculated (using the previously calculated maximum shear stress), The
About 1.0 to 1.5 tons/acre of
channel in a partially vegetated state, usually at 50% plant density, and (3)
The parameter describing the retardance
This calculation requires that a basic
The reason being that inside borrow pits get silted up during course of time, automatically. which describes the degree to which the vegetation cover prevents high
Noncohesive Soil . all very high, ranging from 10.1 to 12.9 ft/sec. obviously account for such considerations as maintenance practices or
taken from the SCS (1977) channel stability criteria: the desired parameters,
characteristics of the cover, which are in turn related to grass type. usually at 6 months, while Phase 3 is mature growth. The high ground on both the sides, D/S of fall is irrigated by taking outlets from U/S of the fall. On the other hand, if the section is too large for the discharge and the slope is flatter than required, siltingwill occur till true regime is obtained. staples. SCS (Soil
Channel Covers, Selecting Plant Materials for Establishing Permanent
Hence because of discharge withdrawn by outlets, and also continuous evaporation and seepage losses, the remaining discharge in the canal goes on decreasing as canal flows towards the tail. the lining rather than stress on the erodible boundary limits stability. S is bed slope expressed in metres/metre length, since (10,000) 1/2 is merged in the constant 0.556. = effective shear stress exerted on soil beneath mat on slope, to
The canal has to be designed to cary 10m 3 /sec on a bed slope of 1 in 5000. boundary stress. An example of a permanent channel design and the selection
Following points should be taken care of, while drawing longitudinal section of canal: 1. If a canal is designed with a section too small for a given discharge and its slope is kept steeper than required, scour will occur till final regime is obtained. fine- or coarse-grained, based on whether d75 is less than or greater than 0.05
the inside of the bend where the water velocity slows. 1987: Williams, D.
al. temporary mid- to late-summer covers. USDA Agricultural
25, Soil Conservation Service, Washington, DC. Asphaltic Slope Protection in Heavy Shade. For such a section payment has to be made only for one operation. As shown in Fig. Outside borrow pits should be located at least 5 m away from the toe of the bank, in case of small canals, and 10 m in case of large canals. and void ratio, e) are readily available for cohesive soils in standard soils
1. potential and boundary protection. F.S.L. procedure. Army Corps of Engineers (COE). The bend coefficient can be estimated by (Croke 2001): Rc
values when the depth of water is greater than 3 ft. a decrease in velocity of 0.5 ft/sec should subtracted then
2. In practice true regime conditions do not develop because of variations in discharge and sediment rates. codes. 54. This
Chronic national seed
The basic shear stress formulas can be modified to account
Installation of reinforced liner along thalweg of channel,
greatly help in the design of the most appropriate channel cross section and
The value of permissible tractive for sinuous canal may be reduced by 10% for slightly sinuous once by 25% for moderately sinuous ones and by 40% for very sinuous ones. construction sites. Join now. Lacey postulated that the required slope and channel dimensions are dependent on the characteristics of the boundary material which he quantified in terms of the silt factor (f) defined as. This factor is commonly used in the following equation to
Join now. When the falls are provided then FSL downstream of the fall may be carried below NSL for a short length. Figure 5-9. The canal section is considered to be most economical when cutting at a particular section equals the filling. See Fig. Assume the bed slope (S) value or find by substituting the values of silt factor and canal discharge in the following formula : Drawbacks of Lacey’s Silt Theory Lacey did not explain the properties that govern the alluvial channel. the sod-forming grasses near the top of the table have higher Cf
U.S.
Desirable wildlife food plants may be included
It is a method of disposal of surplus excavated soil from very deep reaches of the canal. Ideally, the point of
The peak discharge was calculated to be 29 ft3/sec. seed-propagated variety with greater winter hardiness than Arizona Common,
matting material. Figure 5-12. accumulation between rocks. be applied to slope stability evaluations. slope, the soil loss would be about 6.3 inches, while it would be about 1.2
Alignment of the main canal is fixed on the main ridge of the area proposed to be irrigated, so that irrigation is possible on both the sides of the canal. At 2 km point – Let there be 0.02 cumec sized six outlets between 2 km and 3 km points and losses are 0.08 cumec. width flow rate (q) for the slope in question. and not be allowed to go to seed. Table 5-6.. Unvegetated NAG
programs. 19.3 (b). 3. The bed material has a median size of 2.5 mm and its specific gravity is 2.65. The fall or drop structure should be such that F.S.L. The design aspects of irrigation canals can be divided into two parts:-a. 1987). When
bend (same units as R), R =
The basic shear stress equation can be modified to predict
But how to compute the discharge at a particular reach is an important aspect of canal design. soil grain roughness and allowable stress, are determined from basic soil
= bend curvature (radius of the bend). ), pearl millet [Pennisetum americanurn (L.) Leeke], and
(ii) Width of land to be acquired clear of banks when canal cutting is more than balancing depth. Values of Rugosity Coefficient (N) for unlined canals as per IS: 7112 —1973 is as follows: Agriculture, Irrigation, Canals, Design, How to, Design Canals. It is widely used in river engineering, stream restoration, sedimentology, and fluvial geomorphology.It is the product of the water depth and the mean bed slope, along with the acceleration due to gravity and density of the fluid. Close-up of rock reinforced channel, showing sediment
Therefore: = (62.4 lb/ft2)(0.02 ft)(0.15) = 0.18 lb/ft2. The vegetation cover factor, Cf, is
the immediate vicinity of the soil boundary. following calculation indicates the effective shear stress underneath the mat: te
Control Design, Appendix 5A: Commercial Sources for Channel Liners and
19.3 (a). agency. A long, wide channel has a slope of 1:1000, a Manning’s J of 0.015 m–1/3 s and a discharge of 3 m3 s–1 per metre width. North American Green
grow well on a variety of soils. 1. In this section, the bed level of the canal lies substantially above the G.L. The chapter presents how to determine design discharge for irrigation canals and power canals. If somewhere, general slope of the ground is smaller than designed slope, the slope of the channel is changed to general slope of ground and section of the canal is accordingly modified. Journal of Hydraulic Research: Vol. erosion rate on the slope (0.25 inches, or less). The
Channel Linings (Temple, Slope Stability Applied to Construction Site
1' in 5000'. Canals have very steep bed slope, because the direction of steepest slope of ground is at right angles to contour. The safety factor using these values is about 2.2
The roughness is caused due to the ripples formed on the bed of the canal. compound/composite channels, Proceedings
provide the needed protection before the vegetation is established, (2) the
But it is not always possible to run the canal at the desired bed slope throughout the alignment due to the fluctuating nature of the country slope. Depth of inside borrow pits should not exceed 1 m. Usual dimensions of canal cross-section elements have been given here. such as supplied by North American Green (http://www.nagreen.com/),
The ratio of channel width (B) to its depth (D) has no significance in Kennedy’s Silt Theory. minimal cultural treatment, short-lived but quick germinating species, and
McGraw-Hill. (CI) is often more realistic than selecting a single value. stress for noncohesive soils (Temple, et
They
for flow depths: 1 Phase 2 is 50% stand maturity,
3. 1' in 5000'. steepest slope is 15%. supplied by North American Green (from www.nagreen.com). 6, No. soil losses would decrease substantially with time, as the plants on the slope
Based on these calculations, the P300 liner will be suitable. depth (in feet), q is
0.020 and the allowable shear stress is 0.15 lb/ft2 (from Table
(24 month life; 424 g/m, Max. Conservation Factors (C) for Different Erosion Control Mats, for Different
rugosity coefficient of Kutter is 0.0225, CVR = 1 North America
shortages of some warm-season grasses, especially seed of native species, have
Coir rolls/logs and soil adhesives for slope stabilization
Materials. According to Croke (2000), construction site channel design
Croke (2001) points out that this
The hydraulic conditions are summarized in Table 2, including the initial discharge at both gates at and the initial water level of the canal at . South. Agricultural Handbook 667. dactylon var dactylon (L.) Pers. is filled in a standard table known as schedule of area statistics and channel dimensions. The basic shear stress
If the slope length was shorter, the lower
7. stability compared to only using velocity. After
Terms of Service 7. Canals should not be too much in filling. (10 month life; 352 g/m2 mass per unit area), Max. Rise in water level is marginal with substantial increase in discharge above full capacity of the canal. The width of land, required to accommodate the canal cross-section and its connected elements, is known as land width for the canal. Report a Violation 11. . Materials and Research, Approved Erosion Control Products for Slope Protection, Approved Erosion Control Products for Flexible Channel
permissible shear stress: 2.35 lbs/ft, P300 polypropylene fiber erosion
The smallest (and steepest side sloped) channel resulted in the
conjunction with good construction planning, to minimize the amount of land
Because of silting of inside edge and top, the terms become impervious, and as such, loss of water by seepage is reduced. (minimum CI and Cf) is assumed to determine channel width
9. In such a case general ground slope should be adopted and section of the channel should be accordingly amended. of the parent channel. Chow, Ven Te. to 8.0 lb/ft2. channels. The temporary covers should be close-drilled stands
F.C. Obviously, it is important to select materials that will meet local,
Velocity/Allowable Shear Stress Method, Species Selection for Grass-Lined Channels, Selecting Plant Materials for Establishing
simple spreadsheet with multiple cross section and liner options, as shown in
For a
But on the slope of the banks there is one more disturbing force i.e. while the roughness coefficients are standard Mannings roughness values. and no protective armoring from erosion control mats, the initial channel
H.B.K. 7. Slopes Protected by Erosion Control Netting and Vegetation, Installation of Erosion Control Matting (SCS photo), Stockpile of Erosion Control Mats at Construction Site, Netting over Mulch allowing Grass to Grow, Various Slope Protection Treatments and Tree Conservation. While marking bed level it should be ensured, that it will involve either too much cutting nor filling and secondly the full supply level of the canal will remain above the ground level so that irrigation is possible on both the sides, along the alignment. When two or more grasses with widely differing growth characteristics are
Concrete-lined channel, with reinforced matting along
With a seeded channel
F.S.L. The canal has rigid banks and an erodible bed; it is laid on a slope of 0.0005. This formula obviously cannot be used for a V-shaped
Channel Design for Soil and Water Conservation. June 2000. At 4 km point – Let from 4 km to 5 km point there be five outlets, each of 0.06 cumec. F.S.L. Table 5-7. control blanket (permanent use; 456 g/m, Phase 2 is 50% stand maturity,
shear stress due to channel bend (North American Green). Dimensions of a canal section with circular bed may be obtained from the equations given below. S = bed slope . In case of very small channel i.e. for these slope conditions is needed. The area under the command of each distributory or minor, is further subdivided into small areas surrounded by small drainages and each area is known as clink. (ii) For discharge of 15 cumecs and above depths for various discharges should be as follows: The channel sections for an irrigation canal may be of following four types: This canal does not require any bank as F.S.L. Where winters are mild, channels can be established quickly with
19.2 (a). 1987), Cover Factor (Cf)
0.037 should be adequate for this example. Its main purpose is not to allow the seepage line expose on the outer slope of the bank. (c) In a region of the channel the bed is raised by a height of ], Kentucky
However, if the channel
Construction. directly from SCS (1977) permissible velocity design criteria. to prevent erosion on site, instead of relying on sediment removal from the
When the effective stress approach is
1987): te
Consider a particle of weight w resting on the slope … 3.21 or; more conveniently, use equation mentioned above. mature plant establishment in the channel, the maximum allowable shear stress increases
in regard width of the land: (i) Width of land to be acquired clear of banks when canal is in less than balancing depth of cutting. Refer to 'Side Slopes' above for the format. SCS-TP-61, rev. The tolerable soil loss for permanent slope protection is given as 0.03
that the slopes have been designed by geotechnical engineers to prevent
Question: Q2) Design Warped Transitions Between A Lined Canal (caring 6m3/sec, Depth Of Flow 1.5 M, Bed Slope 17.7 Cm/km, Side Slope 1.5:1, N = 0.015 And Bed Width 2.4m) And A Rectangular Bridge Crossing 1 Om Long. stress will increase the erosion potential, while sedimentation may occur along
Shear stress considers the weight of the
(58/3 = 73.14) for the shape
conditions are then used to compute the required depth (capacity). However, there are
The depth–slope product is used to calculate the shear stress at the bed of an open channel containing fluid that is undergoing steady, uniform flow. It is provided to prevent waves or fluctuations in water surface from overtopping the banks. ), and Western wheatgrass (Agropyron
In fact, any erosion mat with a Mannings roughness larger than
S75 straw erosion control blanket (12
6. The permissible tractive force is a function of average particle size (D50) of canal bed in case of canals in sandy soils and void ratio in case of canal in clayey soils and sediment concentration. areas of the United States. is transmitted to the erodible boundary through the plant root system, and (3)
Such an approach will normally result in satisfactory operation for
between 20 and 50 ft (6 to 15 m). As per recommendation of Central Water and Power Commission (C.W.P.C.) Properties of Grass
There is not perfect definition for salt grade and salt charge. this equation because this will result in the maximum shear stress developed,
Conservation Service). 1954. Actually the whole of the area where irrigation is proposed is surveyed, and contour plans prepared. bluegrass (Poa ratensis L.), reed
Thus, a canal fall or drop is an irrigation structure constructed across a canal to lower down its bed level to maintain the designed slope when there is a change of ground level to maintain the designed slope when there is change of ground level. computational procedure through the use of different cover conditions to
Table 5-5. Vol. How Slope Instability Can Lead to a Canal Failure ..... 24 3.3. It will grow on many soil types, but at times it may demand extra
The vertical distance between F.S.L. Practically, for a given canal bed material and according to the internal angle of repose, the canal side slope, m, is decided. With a velocity of 10.4 ft/sec and a shear stress of 1.8
negligible. Accounting for bends in channel design. Erosion
Privacy Policy 9. The canal must be able to resist pore pressure; thus, the lining thickness must be sufficient for this task. = 29 ft3/sec/2.78 ft2 = 10.4 ft/sec. covers, uniformity of density is primarily dependent on the growth
No. NAG P300 permanent mat, for example, The
The difference in F.S.L. Bed slope as obtained by Lacey’s theory if equals general slope of the ground it will be an ideal situation. stress are constant, while for a coarse-grained soil, these parameters are a
A grass mixture should include species adapted to the full range of soil
2.4 lb/ft2 for the cross sections examined. Using RUSLE: The base
2) Soil retention blankets, or mats, made of various
the mat must be: 0.25/1.45 = 0.17, smaller. See Fig. area. (iii) Various crops that will grow after the commissioning of the proposed canal. Banks should be properly compacted while making. At zero km point i.e. enhance germination and establishment. TABLE-3: Longitudinal slope Slope of the channels in 10 m / km S0 = 0.01 Western Ghats Gentle slope Moderate slope 10 to 20 m / S0 = 0.01 to Permissible Velocities: Minimum and Maximum It may be noted that canals carrying water with higher velocities may scour the bed and the sides of the channel leading to the collapse of the canal. (24 month life; 424 g/m2 mass per unit area), Max. equation: Where q is the unit width flow = 1.2 ft3/sec/104
All the information regarding discharge, canal section, slope, area under irrigation, losses at each point etc. When consistent units are used, the relation is
Section whose bed level is slightly above the G.L. They increase the width of the bank, and thus, seepage line is not likely to be exposed. regardless of the type, can cause seedling disease problems. Relationship. maximum flow depth in the cross section (ft), Cf
(a) For major canals – As per actual drawing + 5 m. (b) For minors and distributaries – As per actual requirements +1.5 m. It is also known as back berm. Contents:Lacey’s Silt Theory of Canals1. will have perennial (or long-term) flows, grass will not be successful and
ASCE, Vol. parameter is expressed in terms of a flow resistance coefficient (ns),
Charlottesville, 22-26 May 1989, pp
represent the weakest area in a reach rather than an average for the cover. Flatter Clay Soils: Contech Straw/Coconut Fiber Mat w/Kraft Net. will not exceed twice the depth of water. To overcome this situation, the canal has to be provided with falls (Fig.6.1) which require a masonary or concrete work. shown here are permanent liners and therefore have different values for
The overall head loss is to be 0.1m, between V/S and D/S canal reaches.. A … Ice cover influence on transverse bed slopes in a curved alluvial channel. Regime Type Fitted Equations for Design of Unlined Canals in Alluvial Soils: The regime type fitted equations evolved on the basis of data collected from various states in India are given in Table 19.4. Enough flow to carry particles in suspension or in bed load along an unobstructed path beyond the point where the soil particle has been removed from its resting place An unfiltered exit through which soil particles can be removed by seepage . Essays, Research Papers and Articles on Agriculture in India, Longitudinal Section of Canals (With Diagram) | Irrigation | Agriculture, Inundation Canals: Characteristics & Maintenance | Irrigation | Agriculture, List of Important Agricultural Development Programmes | India. inches for the protected slope. Irrigation canals are constructed with some permissible bed slopes so that there is no silting or scouring in the canal bed. In this way, the whole of the area to be irrigated is divided into several parts and each part is commanded by a branch, distributory or minor depending upon the extent of the area. Length (m) Bottom width (m) Height (m) Bed slope: Side slope: 1000 : 3.97: 2.5: 0.0005: 0: Table 1 . the maximum shear stress expected on a slope: Information in Chapter 4 can be used to calculate the unit
(2 Marks) Q2Find flow speed and depth of water above a hump in the Figure Q3. determination of two vegetation parameters. lies below the G.L. and C125 if the slope lengths are up to 50 ft). involved, the representative stem length is determined as the root mean square
TR-25. (vi) Losses due to seepage and evaporation. Included on these tables are conservation factor, C, values used in RUSLE for
of canal lies just at G.L. The soil classification information (plasticity index, Iw,
Vol. the upslope diversion channel U2 that captures upslope runoff from 14.6 acres
Procedure:-1. Cf
If designed slope of the channel is greater than general slope of the ground, the channel would go deep in cutting after running for a short distance running. = 0.055, and C=0.19), Soil
Additional permissible shear stress
For practical application in computing soil grain
simultaneous equations relating channel geometry and flow conditions to
and Design: Channel Stability Assessment for Flood Control Projects. immature vegetation allows immediate protection of the sensitive soil boundary
close to the bed. Fluvial
These required parameters for noncohesive soils are
5-2). CWPC has given following bank widths depending upon the discharge –. (v) Intensities of irrigation during Rabi and Kharif crops. Mannings roughness coefficient for liner in the channel bend. “Determine the maximum depth of a wide canal for which scour of the bed material can just be prevented. We may use the graph in Fig. linings. of a grass-lined channel is usually negligibly small. R =
Sedimentation
different plant growth stages. Maximum estimated cover
Prentice Hall. Therefore, the unit width peak flow = Q/W = 2.2 ft3/sec/200
Whatever the approach used to
beneath the liner mat must be less than the permissible shear stress for the
Summer 2001. Obviously, the liner matting significantly reduces the shear stress
To overcome this head loss, F.S.L. establishment and maintenance of grass-lined channels is provided in Temple,
and top of the lowest bank of the channel is known as free board. The second is the vegetation cover factor (Cf)
of the canal D/S of fall remains below G.L. Outlets fixed on the canal at regular intervals draw discharge from the canal and supply it to the fields for irrigation. The calculated shear stress being exerted on the soil
Edition. Ask your question. Log in. and testing procedures. ft = 0.012 ft2/sec. Bermudagrass is not shade tolerant and
concepts are similar to what occurs at construction sites, and these are
Outside borrow pits are not preferred as they may become mosquito breeding centres during rains. ft = 0.011ft2/sec and the flow depth is: This depth corresponds to a flow depth of about 0.4 inches. For side slopes of the canal, avg shear stress =0.75×γw ×RS (1.5/0.067), so the slope should be adequately protected when an adequate mat
Control Design, Slope Stability Applied to Construction Site Erosion
Each of these differences requires special consideration in the design process. The Manning equation invokes the determination of flow velocity based on the slope of channel bed, surface roughness of the channel, cross-sectional area of flow, and wetted perimeter of flow. See Fig. When r = 3.6 m or less, side slopes may be taken 1: 1 . will require an additional channel depth needing protection at outside bends. For effective stress design, soil grain roughness is defined
Copyright 10. permissible shear stress: 2.25 lbs/ft, C125BN coconut fiber erosion control
densities contained later in Table 5-5 may be used as a guide in estimating
1977. 1987). computations and the upper bound should be used in determining channel
channel, where the bottom width is zero. A/P, and P = 5 + 2(3.16)(0.44) = 7.78 ft.; R = A/P = 2.78 ft2/7.78
If design slope of the canal is less than general slope of ground, canal falls will have to be provided, at suitable intervals. Whenever the available natural ground slope is steeper than the designed bed slope of the channel, the difference is adjusted by constructing vertical 'falls' or 'drops' in the canal bed at suitable intervals, as shown in Fig. ... Kennedy assumes that the eddies are produced on the bed of canal only but Lacey proposed that eddies are produced along complete wetted perimeter. fiaarsa1300 30.01.2018 Math Secondary School +13 pts. recommend multiplying the stem densities given by 1/3, 2/3, 1, 4/3, and 5/3,
substantially greater than the allowable shear stress for the soil. J., and Tan, S. K. Erosion of cohesive soils, Journal of Hydraulic Research, Vol 22, No. Dowla is an earthen bond 50 cm high and 50 cm wise at the top. function of particle size. See the previously
Size of the outlet depends upon the command areas available in a chak for irrigation. Commercial wood
Hydraulic
Types of canal fall The reference stem
R = The hydraulic mean depth of an existing stable canal, and. Later chapters will describe sediment control measures, and their design, for
compatible with the grasses and noncompetitive. permissible shear stress: 1.85 lbs/ft2 (88.0 Pa), SC150 straw erosion control blanket
slope is greater than the permissible bed slope of canal. highest shear stress of 4.99 lb/ft2, less than the acceptable 5.5
(1994). Every reach of the canal is described by four basic design variables; bed slope, bed width, upstream bed level, and upstream berm level. The discharge required at a particular point on the canal depends upon the area to be irrigated lying D/S of that point and also upon the seepage and evaporation losses occurring in the canal itself, lying D/S of that point. For slopes, however, tolerable soil loss
Roughened slope after compaction by Sheeps foot

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