Analysis Performance Evaluation of Measuring Building (BM1) and

Cipoletti (BM3) Buildings in the Mambal Irrigation Network

of the Ayung River Irrigation Area

I Made Budiadi, Made Mudhina, Ketut Wiwin Andayani, Igag Suryanegara and I Wayan Wiraga

Department of Civil Engineering Bali Sate Polytechnic, South Kuta, Bali, Indonesia

Keywords: Mambal Irrigation Area, Measuring Building, Cipoletti, Performance Evaluation.

Abstract: The discharge canal in the Mambal irrigation area is a very important structure because it distributes water

proportionally to the paddy fields. The results of field observations show that the current formula is no

longer suitable for the canal characteristics due to changes in the physical shape of the building. Therefore,

it is necessary to evaluate the performance of the Cipoletti measuring channel and measuring channel to

obtain the actual flow coefficient. This research was conducted by testing the flow formula compared to

factual discharge measurements to obtain the actual flow coefficient. Instantaneous discharge measurements

are carried out with various variations of discharge in order to obtain a discharge coefficient that is truly in

accordance with the characteristics of the measuring building. The results showed that for BM 1 the new

formula was obtained Q = 1.430 Bh

3/2

. In BM 3 a new formula is obtained as follows Q = 1.78 b h

3/2

1 INTRODUCTION

The development carried out by the Government in

increasing food self-sufficiency is to improve

irrigation network services by revamping buildings

and canals that are in the same area. Until now, the

biggest water loss for irrigation water distribution is

the loss of water in secondary and tertiary canals,

which ranges from 20-30% of the water distributed

(Nugroho 2014), (Perdana and Wiguna 2019).

Improvement of buildings and canals from semi-

technical irrigation to technical irrigation has a very

positive effect in reducing water loss along the way.

Irrigation in Bali departs from the traditional Subak

irrigation agricultural system combined with a

modern irrigation system that is more technical in

nature to give a touch in the building management

system. This combination provides a more technical

farming system than previous farming

(Prastyadewia, Susilowati, and Iskandara 2020),

(Asmiwyati et al. 2015), (Budiasa et al. 2015)

Associated with the distribution of water to the

plots of irrigated rice fields have been arranged

through existing buildings along the network.

Buildings on irrigation networks in primary and

secondary canals were built by the government

through relevant agencies while buildings on tertiary

and quarter canals were built by farmers. Buildings

located in the primary and secondary canals consist

of several buildings such as share buildings, for

tapping, crossing dives, mud bags, measuring

buildings and other buildings. (Ahmed 2020),

(Akkuzu, nal, and Karataş 2007). The measuring

building is one of the important buildings in the

irrigation network because it has a function related

to the accuracy of the amount of water distributed to

the rice fields. This measuring building provides the

amount of water as needed by setting the water level

in the measuring building.

The building measuring the width threshold and

Cipoleeti in the Tukad Ayung irrigation area at the

Mambal weir drainage condition has undergone

many changes in shape as a result of the condition of

the building undergoing several changes such as

cracked walls, rusted sills and the presence of

sediment upstream and downstream of the building.

measuring. As a result of this condition, it is felt that

there is a mismatch of water distributed to farmers'

fields. This situation has a direct effect on the

decline in optimal growth of rice plants which can

reduce grain production at the farmer level.

Condition. From the preliminary research conducted,

352

Budiadi, I., Mudhina, M., Andayani, K., Suryanegara, I. and Wiraga, I.

Analysis Performance Evaluation of Measuring Building (BM1) and Cipoletti (BM3) Buildings in the Mambal irrigation Network of the Ayung River Irrigation Area.

DOI: 10.5220/0011801800003575

In Proceedings of the 5th International Conference on Applied Science and Technology on Engineering Science (iCAST-ES 2022), pages 352-357

ISBN: 978-989-758-619-4; ISSN: 2975-8246

it shows that the flow formula in the measuring

building used today has been used since the building

was built and has never been adjusted until now. In

order to obtain the actual flow coefficient from the

current condition of the measuring structure, it is

very necessary to carry out an analysis of the flow in

the existing measuring structure. The results of this

study can be an important reference related to the

actual flow coefficient so that the distribution of

water by measuring structures is the same as that

required by farmers for irrigating their fields. Thus,

the results of this study can also be used as a guide

for the operation and maintenance system of

irrigation areas in the Mambal irrigation area. The

problem in this research is what is the flow

coefficient applied to the existing measuring

building and what is the actual flow coefficient

based on the test results? The purpose of this study

is to determine the currently applied coefficient and

compare it with the actual flow coefficient of the

measurement results

2 METHOD

Calibration is one of the steps to determine the

stability of a measuring object to get the actual

measurement results. (Shock, Barnum, and Seddigh

1998), (Collectives n.d.), (Santos et al. 2021). The

research was designed for six months by conducting

research activities both in the field and analytically

involving a research team of lecturers and students.

Field research was carried out by coordinating with

several parties including the Bali Provincial Public

Works Service and irrigation observers based in

Lukluk Kapal. Coordination is carried out to

determine the timing of the implementation of the

instantaneous discharge measurement so that it does

not interfere with irrigation operations that are

already running. While the analysis is carried out by

analyzing the instantaneous discharge juxtaposed

with the flow formula in a measuring building. Field

surveys to determine the condition of the measuring

building include: the location of the measuring

building. difficulty level of measurement, temporary

method of measurement, physical condition of

measuring building, current flow formula and

problem of measuring accuracy of building

Measurement of instantaneous discharge is

carried out in several ways depending on the needs

and field conditions, for example with a current

meter, buoys and others (Setiawan and Purwanto

2018), (Indonesian National Standard 2015).

Instantaneous discharge measurement requirements

are carried out with the following requirements: in a

straight location, not affected by trees or roots,

evenly distributed and it is estimated that there is no

circular velocity distribution, there are no other

factors that can cause a sudden rise in water level,

the measurement depth should be 3 times to 5 times

the diameter of the propeller. Measurement

personnel requirements: have experience in taking

measurements at least in the same job and have

received instructions on how to measure before and

have a healthy body condition (Busscher 2009)

(Jaiswal et al. 2012) (Kroc and Zumbo 2018), (Liu

and Henze 2005)

Examination of the current meter includes that

the battery used is new, the panel is visible when the

measurement is taken, when taking the

measurement, it is expected to wear a life jacket,

there is a handle that can be used in an emergency

and a measurement form is available

Figure 1: Current Meter.

Calibration is an activity to test the current ar

flow formula by comparing the factual discharge

with the theoretical discharge. The series of

activities include determining the measurement

point, measuring the cross-sectional width,

determining the depth of the water, measuring the

instantaneous discharge, analyzing the instantaneous

discharge and calibration.

The steps of calibration activities start from

building inventory, instantaneous flow

measurement, discharge analysis and calibration.

Instantaneous discharge measurements are carried

out at least 10 times to obtain valid measurement

data. Complete calibration steps as shown in Figure

Analysis Performance Evaluation of Measuring Building (BM1) and Cipoletti (BM3) Buildings in the Mambal irrigation Network of the

Ayung River Irrigation Area

353

Figure 2: Research flow chart.

The Measurement Building DI Mambal is located in

two locations, namely in Kapal BM1 Village. and

BM3. In general, the condition of the building is

very well maintained and can operate well. The

problem, in general, is the presence of sediment in

the channel which affects the flow. This

sedimentation is caused by the remnants of the

building downstream which enter the channel

causing disturbances upstream. A complete picture

of the condition of the building can be seen in the

image below.

Building Measure BM1

This measuring building is in the form of a wide

threshold with a masonry construction with a plunge

downstream as shown in Figure 3 below:

Figure 3: Measuring building BM1.

Building Measure BM3, This measuring building is

a cipoletti measuring building whose threshold is a

sharp threshold made of steel. More details can be

seen in Figure 4 below.

Figure 4: Measuring Building BM3.

2.1 Inventory

Inventory is carried out to determine the current

condition of the building and the planned

measurement activities to be carried out. This

inventory records the location of the building, the

condition of the building, the current flow formula,

as well as the current debit measurement technique

plan that will be carried out.

2.2 Instantaneous Discharge

Measurement

Instantaneous discharge measurements are carried

out to determine the actual discharge conditions by

iCAST-ES 2022 - International Conference on Applied Science and Technology on Engineering Science

354

measuring repeatedly for at least 10 trials. The

instantaneous dbit measurement is carried out in the

measuring building using the measurement form that

has been provided with a calibrated current meter.

Measurements were carried out with different

variations in water height so as to produce varying

discharges (Xu et al. 2021).

2.3 Analysis

The analysis was carried out after knowing the

actual discharge data from the measurement results.

This analysis was conducted to obtain the value of

the flow coefficient (Cd and CV). After obtaining

the Cd and CV values, a regression analysis was

carried out to determine the actual magnitude of the

coefficient.

3 RESULTS

Calibration shows that each water level has different

Cv and Cd values. The higher the water, the higher

the discharge as well as the values of Cv and Cd

which show varying values. More details can be

seen in Table 1 below:

Table 1: Calculation of the value of C (Cd,Cv) in BM 1.

buildings.

Exp. Discharge h

3/2

1,705Bh

3/2

(m3/dt) (m)

1 0.04 0.01 0.09 0.43

2 0.28 0.06 0.39 0.72

3 0.43 0.08 0.52 0.82

4 0.49 0.09 0.59 0.84

5 0,89 0.16 1.07 0.84

6 1.24 0.21 1.45 0.86

7 1.48 0.25 1.71 0.87

8 1.87 0.34 2.33 0.80

Figure 5: Relationship between Cv and Cd in BM 1.

Table 2: Comparison between H with Q and Cd, Cv.

Experiment H average Q Cd,Cv

1 0.06 0.04 0.43

2 0.15 0.28 0.72

3 0.18 0.43 0.82

4 0.2 0.49 0.84

5 0.29 0.90 0.84

6 0.36 1.24 0.86

7 0.40 1.48 0.87

8 0.49 1.87 0.80

9 0.48 1.94 0.85

10 0.49 1.96 0.83

Figure 6: Relationship Between H, Q and Cd,Cv in BM 1.

Analysis Performance Evaluation of Measuring Building (BM1) and Cipoletti (BM3) Buildings in the Mambal irrigation Network of the

Ayung River Irrigation Area

355

Table 3: Calculation of the value of C (Cd,Cv) in BM 3.

buildings.

Exp. Discharge h3

2.95 Bh

3/2

/dt) (m)

1 0.34 0.033 0.587 0.58

2 0.73 0.062 1.094 0.67

3 1.12 0.096 1.697 0.66

4 1.56 0.131 2.327 0.67

5 1.38 0.147 2.603 0.53

6 1.73 0.175 3.109 0.56

7 2.51 0.202 3.583 0.71

8 1.76 0.189 3.351 0.52

9 1.78 0.187 3.321 0.53

10 2.36 0.181 3.215 0.73

Figure 7: Relationship Between H, Q and Cd,Cv in BM 3.

Figure 8: Relationship between Q and 2,95 BH3/2 in BM 3.

4 CONCLUSION

Based on the results of the discussion that has been

carried out, several conclusions can be drawn as

follows:

1. The formula for the drainage system in the

building measuring BM1 A and BM 3 is

currently Q = 1.71 B h1,5

2. Based on the results of observations made, it

shows that the formula of the research results

shows the formula for the drainage system as

follows:

a. In buildings measuring BM 1

From the analysis results, the magnitude of Cd x

Cv = 0.839 is obtained so that the calibration of

the old formula Q = 1.71 B h0.5 becomes the

new formula as follows: Q = 1.705 Cd Cv B h

3/2

so that it becomes: Q = 1.705 0.839 B h

3/2

or Q =

1,430 B h

3/2

b. On Buildings Measure BM 3

By entering the value of 2g 0.5, then Q = 2.95

Cd b h

3/2

based on the results of the analysis

obtained a cd value of 0.604 so that the new

formula is obtained as follows Q = 1.78 b h

3/2

Suggestion What can be suggested is when the

instantaneous discharge measurement is carried out

carefully so as to produce calibration results that are

truly in accordance with field conditions.

ACKNOWLEDGMENT

On this occasion, the authors would like to thank all

those who have helped in this research, especially

the Department of Civil Engineering at the Bali

State Polytechnic and friends from the Hydraulics

Laboratory of the Civil Engineering Department

who have provided assistance in thinking and

measuring activities in the field.

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Analysis Performance Evaluation of Measuring Building (BM1) and Cipoletti (BM3) Buildings in the Mambal irrigation Network of the

Ayung River Irrigation Area

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