Implementing the Prepaid Smart Meter System for Irrigated Groundwater Production in Northern China: Status and Problems

To reduce the gap between groundwater demand and supply caused by agricultural groundwater over-exploitation, the Prepaid Smart Meter System (PSMS) is being strongly implemented by the Chinese government in northern China. This study reports the analysis and results of PSMS field surveys in six typical provinces in northern China as well as domestic literature reviews. Based on the architecture and implementation policies of the system, the implementation differences between areas and the influencing factors were analyzed, particularly the acknowledgment of farmers, the installation proportion of tube wells, the social benefits. Great achievements have been gained in the implementation, and the management targets have been achieved, including accurately metering overall irrigation groundwater production, assisting in the total amount control and quota management, reducing groundwater exploitation, and improving water use efficiency. However, shortcomings remain in the implementation process, such as single initial investment channels, imperfect policy system construction, a lack of retrieving and analyzing data, and the unbalanced development between areas. Countermeasures and suggestions for these problems are discussed in this article.


Introduction
The arid and semi-arid areas of northern China are prosperous due to a large population and rapid economic growth; however, available water resources are insufficient for development and the deficit between water demand and supply is growing. Groundwater is important for China's water supply [1][2][3], especially in the northern China provinces. Groundwater supply accounts for more than half of the water resource supply in provinces such as Hebei, Henan, Beijing, Shanxi, and Inner Mongolia [4]. Due to the spatial-temporal distribution characteristics of precipitation, the irrigated agricultural areas primarily located in northern China experienced a rapid expansion after the 1970s. More than half of the cultivated areas are under an irrigation scheme and over 75% of the crop output is generated from irrigation in the Yellow River Basin, Haihe River Basin, and Huaihe River Basin [5]. Crops were increasingly harvested using this strategy [2,6], and groundwater consumption increased to meet the irrigation demands. Groundwater demand is also continually increasing due to urbanization, including the two large cities of Beijing and Tianjin and the construction of industries and mines. Groundwater resources are not abundant in the plain areas of northern China, which only contains 1/3 of the nation's groundwater resources [4]. Groundwater was significantly overexploited in northern implementation of the PSMS in China can provide good feedback and lessons learned for domestic management and for other countries; however, reviews or reports are seldom found. This research comprehensively introduced the large-scale implementation of the PSMS in China since the end of the 20th century. The PSMS implementation process and status in northern China was presented and analyzed based on field surveys and interviews in six selected provinces and on domestic literature reviews. The shortcomings of PSMS implementation and management in China are discussed at the end as well as the management countermeasures.

Study Area
The study area is located in northern China, which has 17 provinces and a total area of 4775 × 10 6 km 2 , of which the plain area is 1506 × 10 6 km 2 . Figure 1 shows the study area region, spanning from 32 • N to 53 • N and from semi-humid to arid and semi-arid climatic zones. The average precipitation decreases from 800 mm/a in the east coastal areas to less than 100 mm/a in the west inland areas. Thick quaternary aquifers with large volumes of groundwater resources deposited in the plain areas, such as the North China Plain (NCP), Shanxi Basin, Northeast Plain, the northwest oasis, etc., supply abundant water resources for cultivation. These plain areas have been major grain producing resources in China since ancient times through the cultivation of wheat and corn.
Water 2017, 9,379 3 of 18 comprehensively introduced the large-scale implementation of the PSMS in China since the end of the 20th century. The PSMS implementation process and status in northern China was presented and analyzed based on field surveys and interviews in six selected provinces and on domestic literature reviews. The shortcomings of PSMS implementation and management in China are discussed at the end as well as the management countermeasures.

Study Area
The study area is located in northern China, which has 17 provinces and a total area of 4775 × 10 6 km 2 , of which the plain area is 1506 × 10 6 km 2 . Figure 1 shows the study area region, spanning from 32° N to 53° N and from semi-humid to arid and semi-arid climatic zones. The average precipitation decreases from 800 mm/a in the east coastal areas to less than 100 mm/a in the west inland areas. Thick quaternary aquifers with large volumes of groundwater resources deposited in the plain areas, such as the North China Plain (NCP), Shanxi Basin, Northeast Plain, the northwest oasis, etc., supply abundant water resources for cultivation. These plain areas have been major grain producing resources in China since ancient times through the cultivation of wheat and corn. Compared to the large water demand and potential demand, the amount of water resource supplies in the study area is insufficient. With 13% of the country's water resources available, the eastern part of the study areas fosters 44% of China's population and 65% of its cultivated land [43]. Especially in the relatively well-developed NCP, although it only has 6.65% of the water resources in China, this region accounts for Compared to the large water demand and potential demand, the amount of water resource supplies in the study area is insufficient. With 13% of the country's water resources available, the eastern part of the study areas fosters 44% of China's population and 65% of its cultivated land [43]. Especially in the relatively well-developed NCP, although it only has 6.65% of the water resources in China, this region accounts for approximately 12% of China's GDP and more than 10% of China's total grain production [44,45]. Figure 2 shows that agricultural water consumption in northern China increased from 1700 × 10 8 m 3 /a to 2100 × 10 8 m 3 /a and accounted for approximately 75% of the total water consumption from 2003 to 2014. The groundwater supply fluctuated from 880 × 10 8 m 3 /a to 1000 × 10 8 m 3 /a during 2003-2010. The proportion of the groundwater supply compared to the total groundwater resources in the area increased from below 35% to approximately 40% over the past 11 years. The proportion of the groundwater supply to the total water supply was maintained at approximately 36%. approximately 12% of China's GDP and more than 10% of China's total grain production [44,45]. Figure 2 shows that agricultural water consumption in northern China increased from 1700 × 10 8 m 3 /a to 2100 × 10 8 m 3 /a and accounted for approximately 75% of the total water consumption from 2003 to 2014. The groundwater supply fluctuated from 880 × 10 8 m 3 /a to 1000 × 10 8 m 3 /a during 2003-2010. The proportion of the groundwater supply compared to the total groundwater resources in the area increased from below 35% to approximately 40% over the past 11 years. The proportion of the groundwater supply to the total water supply was maintained at approximately 36%.  Figure 1 shows the six typical areas that were selected. The collected first-hand materials comprised interviews with the local water bureau at each level, water bureau report materials, field surveys and interviews with farmers in the typical areas, the results from projects in which the authors participated, etc. (Table 1.) In addition, approximately 100 domestic articles related to the PSMS were collected, 20 of which were selected due to their focus on agricultural PSMS implementation and management. The data and information in the articles were estimated with the materials acquired from the field surveys and interviews.  Figure 1 shows the six typical areas that were selected. The collected first-hand materials comprised interviews with the local water bureau at each level, water bureau report materials, field surveys and interviews with farmers in the typical areas, the results from projects in which the authors participated, etc. (Table 1.)

Materials and Methods
In addition, approximately 100 domestic articles related to the PSMS were collected, 20 of which were selected due to their focus on agricultural PSMS implementation and management. The data and information in the articles were estimated with the materials acquired from the field surveys and interviews. 2. Field surveys and investigations were conducted in 15 selected villages in the Taocheng-Shenzhou area in the form of a questionnaire and interview to understand the status of PSMS promotion.

Shandong
Zibo-Weifang groundwater depression cone 1. Interviews were held with the water resources bureau of Huantai County, Shouguang County, and Gaomi County within the depression cone to understand the status of PSMS implementation in 2014. A field survey was conducted in Huantai County with end user interviews.
2. Discussions were conducted with the water resources bureau for counties in the area to discuss issues related to the implementation of the system in October 2014.
3. Discussions were held with the water resources bureau of Shouguang County and Huantai County in the form of questionnaires in January 2015. Furthermore, a field survey was conducted for the terminal parts of the system and user interviews were held.

Gansu
Shiyang River Basin and Heihe River Basin 1. An investigation was conducted in the Shiyang River Basin in April 2014, including interviews with the provincial water resources bureau, basin management bureau, and local water resources bureau, as well as reports from the local water resources bureau and PSMS field surveys in the Quanshan irrigation district in the basin.
2. An investigation was conducted in the Heihe River Basin in September 2014, including interviews with the provincial water resources bureau, basin management bureau, and local water resources bureau, as well as reports from the local water resources bureau, PSMS field surveys in the Luotuocheng irrigation district and Yingke irrigation district and communications with farmers.
3. A field survey was conducted in four towns and villages of Minqin County downstream of the Shiyang River Basin to understand the PSMS operation in April 2015 and discussions and communications with farmers were also held.

Xinjiang
Fukang County 1. An investigation was held in Fukang County in March 2014. PSMS discussions were held with the county level water resources bureau who initially provided a report on their system. 2. A field survey was held in the town of Ziniquanzi for the operation of terminal facilities and the management center.

PSMS Status in Northern China
The Chinese government committed to having all the irrigation wells controlled and measured in typical areas since the end of the 20th century. The PSMS was selected as the management tool to bring the distributed agricultural groundwater production into a unified control system. A further goal was to achieve total water amount control and quota management for agricultural groundwater consumption. During the more than 10-year development process, it was constantly developed and improved for not only the software and hardware structure of the PSMS but also for the supporting policies. A significant measurable achievement was also attained.

System Architecture
As a management system, the partners in the PSMS consist of many stakeholders, such as large masses of distributed end water users, first-line managers, government bureaus, etc. Figure 3 shows that a typical PSMS is composed of five basic parts that reflect the process of top-down quota setting and bottom-up data summarizing.
Water 2017, 9, x FOR PEER REVIEW 6 of 18

PSMS Status in Northern China
The Chinese government committed to having all the irrigation wells controlled and measured in typical areas since the end of the 20th century. The PSMS was selected as the management tool to bring the distributed agricultural groundwater production into a unified control system. A further goal was to achieve total water amount control and quota management for agricultural groundwater consumption. During the more than 10-year development process, it was constantly developed and improved for not only the software and hardware structure of the PSMS but also for the supporting policies. A significant measurable achievement was also attained.

System Architecture
As a management system, the partners in the PSMS consist of many stakeholders, such as large masses of distributed end water users, first-line managers, government bureaus, etc. Figure 3 shows that a typical PSMS is composed of five basic parts that reflect the process of top-down quota setting and bottom-up data summarizing.


Information management center: A management center is located in one irrigation district in the western area and in one eastern area county. The center comprises servers, databases, customized software, and displays that can illustrate data processing results combined with Geographic Information System. This section can provide and display a summary of information to help local governments make decisions.  Village management platform: Commonly, a management platform is established for a village or a Water Users Association (WUA). The primary function of the platform is to support the village committee or the WUA to sell water and electricity, charge fees, and to preliminarily track the consumption data. In Gansu Province, because the quota is divided among the end users directly by the water bureau, users can inquire about their quota on the village platform. • Information management center: A management center is located in one irrigation district in the western area and in one eastern area county. The center comprises servers, databases, customized software, and displays that can illustrate data processing results combined with Geographic Information System. This section can provide and display a summary of information to help local governments make decisions. • Village management platform: Commonly, a management platform is established for a village or a Water Users Association (WUA). The primary function of the platform is to support the village committee or the WUA to sell water and electricity, charge fees, and to preliminarily track the consumption data. In Gansu Province, because the quota is divided among the end users directly by the water bureau, users can inquire about their quota on the village platform. The platform can also help the WUA understand and manage the quota usage and make adjustments. Additionally, this level is the primary supplier of terminal parts maintenance.
• Intelligent cards, water/electric meter, and intelligent controller: These three sections are regarded as the intelligent terminal client (ITC) that works closely with end users. A meter and a controller are installed on one well. End users who extract from one well use their own intelligent card. After farmers paid their water or electricity quota, their purchasing information would be stored on the card. Farmers can use their quota by swiping the card on the controller. Quota consumption will be recorded accurately by the meter and uploaded by the controller at the same time. Constrained by the ITC, farmers cannot produce water from the well if the prepaid water/electricity has been depleted.

Implementing Policies
Water metering was clearly stipulated in the Water Law [46] issued in 2002 and in the China Water Conservation Technology Policy Outline [47] issued in 2005. It was established again in the No. 460 decree of the State Council [48] in 2006 that water metering shall be implemented and water users shall bear legal responsibilities for installing water metering facilities. The issuing of this decree had strengthened the water metering management. In 2011, the "most strict water resources management policy" proposed by the Central Document No. 1 put forward higher requirements for water metering and statistics management. It states that clear management tasks at all levels should be defined and that water resources metering and accounting networks overlaying all industries should be established. With most of the water production under control, basic data can be provided for the assessment of the Most Strict Water Resources Management System.
According to current policies, the exploitation well owners should cover the purchasing and installation costs of the ITC as well as the verification, maintenance, and renewal fees. However, the users will be subsidized by the local government according to local policies. The government subsidized nearly all the costs of the new facilities, especially in the primary stage of the implementation process. The system operation follows the process of applying-verifying-approving-charging if users want to purchase water or electricity. For verification, managers in the village committee/WUA and in the irrigation district will strictly verify and approve farmers' applications according to the divided quota in areas where quota management has been implemented over a long duration. However, verification is much simpler in areas where quota management is not fully implemented. The government will penalize the users if they destroy or refuse to use the system in the form of fines, administrative penalties, and criminal penalties.
A specific operation policy system had been set up in Xinjiang Province from the provincial to county levels regarded as the joint management of water and electricity. The water bureau has the executive capacity to command the electric bureau to cut off the power supply to wells under the conditions where users refuse to install the ITC, destroy or remove the ITC privately, or convert the ITC to pump over the quota. The electric bureau can turn the electricity back on only when the mentioned violations were reclaimed and the water bureau supplies the permission notice. If a short-term breakdown occurred on the meter or controller, the assistant metering method will start by converting the actual electricity consumption to groundwater consumption.
The highlight of the PSMS in the Shiyang River Basin, Gansu Province is the outstanding operation mechanism, which can be summarized as "Total amount control, quota management, distributing quota to end users, water market and trade, and water coupon circulation". Water management agencies divided a detailed quota for each industry and each crop depending on their water demand. Single farmer's water rights and the quota for one irrigation round were clearly formulated based on the land area, crop type, jurisdiction, etc., and were recorded by his own Water Rights License, Water Users' Knowledge Card, and Ledger. More detailed rules were stipulated by the local government for each aspect of water resource management, such as water right trade, water consultation, using water coupons, maintenance of the ITC, and legal responsibility. For example, there is a detailed clause on how to protect the ITC in the cold winter regarding the procedure, responsibility, supervision, and punishment.

PSMS Implementation Process in Six Provinces
The literature review and field survey showed that the PSMS implementation time and progress varied in different locations (Figure 4). The first report of a PSMS to be utilized occurred in 1997 at the village level in Laiwu City, Shandong Province [49,50]. It is reported that the system was introduced into the Daxing district of Beijing at the end of 2000 and into Leting County, Hebei Province in 2001 [51,52]. The system was introduced as a pilot in Jinzhong County, Shanxi Province in 2001 [53]. However, the system remains at the pilot level in these provinces currently. The field survey showed that the implemented systems are using electricity meters and farmers swipe cards with prepaid electricity fees but not water fees in the Hebei and Shandong Provinces. Approximately 1000 wells of the total 1.1 × 10 4 wells had a PSMS installed with electricity meters in Huantai County located in the groundwater depression cone of Zibo-Weifang in Shandong Province. Through the system, managers in WUA can record an accurate electricity consumption for each user. The ITCs implemented in the Shouguang and Gaomi counties, Shandong Province also contain electricity meters only. Hebei Province incurred high costs to implement PSMSs in the past [54,55]. We conducted a field investigation in 15 villages of the Taocheng District and in Shenzhou County, Hengshui City, Hebei Province, where both groundwater and surface water irrigation is conducted. We determined that ITCs with electricity meters were used in only two villages. In Beijing, PSMSs have been implemented in all the districts since 2007, and meters in the ITC were upgraded from mechanical to acoustic [56,57]. However, both the direct groundwater production metering and conversion from electricity consumed to water pumped are in use, the latter of which has to be converted to water consumption using equations [58].

PSMS Implementation Process in Six Provinces
The literature review and field survey showed that the PSMS implementation time and progress varied in different locations (Figure 4). The first report of a PSMS to be utilized occurred in 1997 at the village level in Laiwu City, Shandong Province [49,50]. It is reported that the system was introduced into the Daxing district of Beijing at the end of 2000 and into Leting County, Hebei Province in 2001 [51,52]. The system was introduced as a pilot in Jinzhong County, Shanxi Province in 2001 [53]. However, the system remains at the pilot level in these provinces currently. The field survey showed that the implemented systems are using electricity meters and farmers swipe cards with prepaid electricity fees but not water fees in the Hebei and Shandong Provinces. Approximately 1000 wells of the total 1.1 × 10 4 wells had a PSMS installed with electricity meters in Huantai County located in the groundwater depression cone of Zibo-Weifang in Shandong Province. Through the system, managers in WUA can record an accurate electricity consumption for each user. The ITCs implemented in the Shouguang and Gaomi counties, Shandong Province also contain electricity meters only. Hebei Province incurred high costs to implement PSMSs in the past [54,55]. We conducted a field investigation in 15 villages of the Taocheng District and in Shenzhou County, Hengshui City, Hebei Province, where both groundwater and surface water irrigation is conducted. We determined that ITCs with electricity meters were used in only two villages. In Beijing, PSMSs have been implemented in all the districts since 2007, and meters in the ITC were upgraded from mechanical to acoustic [56,57]. However, both the direct groundwater production metering and conversion from electricity consumed to water pumped are in use, the latter of which has to be converted to water consumption using equations [58]. A PSMS in the inland river basins of northwest China was introduced later than in the eastern areas but developed quickly. The Jinyang irrigation district of Wuwei City located in the upstream Shiyang River Basin is a good example. With 10 ITCs installed as a pilot in 2007, 1129 ITC sets had been immediately placed into operation covering all the wells in this district until 2008 [59]. This was A PSMS in the inland river basins of northwest China was introduced later than in the eastern areas but developed quickly. The Jinyang irrigation district of Wuwei City located in the upstream Shiyang River Basin is a good example. With 10 ITCs installed as a pilot in 2007, 1129 ITC sets had been immediately placed into operation covering all the wells in this district until 2008 [59]. This was a small portion of the basin. With the concept of "one tube well requires one permit and one meter", basin administrative agencies and local governments had begun PSMS implementation in the jurisdiction since the end of 2007. A total of 13,644 ITC sets and ten management centers were implemented during the following four years, which covered nearly 100% of the tube wells in the basin irrigation system [60,61]. A PSMS was introduced to Fukang County, Changji Prefecture, Xinjiang Province in 2009. We obtained information from interviews that the subsidy from the county finance had increased to RMB 4.25 million (approximately USD 625,000) for ITC installations at the village level, which equates to more than RMB 1 million (approximately USD 147,000) per year. All the groundwater production had been successfully metered for the 1200 wells. An ITC was planned to cover all the tube wells in four years from 2011 to 2015 in the Changji Prefecture [62].
With the goal of evaluating the implementation of the PSMS in different areas and determining the primary affecting factors, seven indexes within two main categories were selected ( Table 2). The principle of the Analytic Hierarchy Process (AHP) was utilized to estimate the weight of each index with the implementation status (A) as a target level, the two main categories as a condition layer (B) and the seven indexes as a factor layer (C). Judgment matrices were constructed for each layer element corresponding to the upper layer based on the estimation of the survey group. The consistency ratio had a reasonable range, and the weight of each index was determined. The top four index rankings were C5, C1, C6, and C4. Finally, the grading scale and value (M) were discussed and identified for the seven indexes.
Six typical areas were scored by the survey group for their grading value (M) of each index. The comprehensive estimation results for the six areas (R) can be determined according to Equation (1). A higher score indicates a better implementation level with a perfect score of five (Table 3).
In the early stage of development, the eastern areas that implemented the PSMS relied on their economical, technical, and information advantage. The implementation goal was to strengthen the management of groundwater pumping to save water [63][64][65]. The system operation is biased on the open market regulation model that uses economic leverage, such as water price, to stimulate farmer's awareness to reduce water consumption. In the second stage of development, especially after the total amount control and quota management were implemented by the Chinese government due to the severe water shortage crisis, the western areas implemented a PSMS rapidly with strict government enforcement. The model is based on the government implementing the PSMS as a management and control tool to strengthen the regulation of groundwater resources exploitation based on the concepts of total amount control and quota management [59,66]. Meanwhile, the market regulation model in the eastern provinces seemed to be lagging in development. The groundwater level decline was significantly inhibited and production decreased significantly The groundwater level decline decreased and production was not significantly increased The groundwater level continued to decline with increasing production

PSMS Effect Evaluation and Outlook
The primary advantage of the PSMS as a management tool is reducing groundwater production by changing the habits of water users. This study estimated the implementation advantage of PSMS. We took the effect of Qingxu County, Shanxi Province as an example.
The PSMS of Qingxu County was imported in 2007 with an ITC installed on all the 1473 tube wells in the county jurisdiction. The total cost of the system was RMB 30 million (approximately USD 4.4 million), not only for the PSMS but also for sixty solar powered observation wells. The water bureau determines each farmer's quota by the total amount index. The quota varies from area to area and depends on the land owned, the number of families, and the livestock owned. The swipe card transactions are transmitted through the internet to the Digital Water Resource Information Centre in the water bureau. This center meticulously records the number of units consumed by each farmer based on the swipe card transactions. In this procedure, the bottom-up summarization of data shows the accurate metering of agricultural groundwater consumption, and the top-down quota division achieves the direct management and control of end water users.
The effects are remarkable. The volume of groundwater consumed in Qingxu County decreased steadily from 0.59 × 10 8 m 3 in 2004 to 0.35 × 10 8 m 3 five years later-a decrease of 30% in a time when the demand for industrial and agricultural water was increasing [67]. The groundwater level improved from a continual decline to increasing at a rate of 1.6 to 4.8 m/year. The regulated PSMS encouraged the efficiency of water use and benefits and promoted the sustainable utilization of water resources. The increasing conflict between the supply and demand of water resources has been alleviated. The declining groundwater environment has recovered.
According to current plans [68], the PSMS will continue to be implemented in northern China. The Ministry of Water Resources plans to install 70,600 ITC sets in groundwater over-exploitation areas, 37,670 of which are for Hebei Province and 16,240 for Shandong Province. The comprehensive treatment of groundwater over-exploitation started in 2014 to increase the installation speed and utilization of the PSMS. It was clearly stipulated in the pilot program of 2014 that ITC should be placed into operation in all the water saving and production limiting program areas in the pilot counties. It was determined that all groundwater fees should be charged based on actual agricultural groundwater pumping volume. The volume should be metered by ITC in the scope of the program areas in the pilot counties and converted from the metered electricity consumption beyond the scope of the program areas. In the western areas where the PSMS had been widely used, the system had covered nearly all the groundwater irrigation districts. Using the Luotuocheng irrigation district in the Heihe River Basin of Gansu Province as an example, groundwater production from approximately 4000 tube wells is the primary water source in the 120 km 2 area. According to the field survey conducted in September of 2014, approximately 1000 ITC sets had been installed on the wells. By May of 2015, all the wells in this district had been metered and controlled by the PSMS. In Gaomi County, Shandong Province, a cultivated field with an area of approximately 14 km 2 has been controlled via the PSMS. The PSMS outlook is promising due to the enthusiasm of the local government at different levels in China. Correspondingly, more than 500 suppliers started businesses in the flourishing market [69].

Initial Investments
It is very difficult and costly to meter all the water used by farmers of a large-scale irrigation system. Major examples for metering at the level of the individual users can be found in modern piped systems in richer countries [70]. Even in modern countries, the installation of water meters to measure the volume of water consumed requires considerable initial investments [71]. The current PSMS implementation in northern China requires a significant investment. China had invested this capital, but a large problem is that the investment is from a single channel of the government.
The Chinese government implemented a Rural Tax Reformation in 2000. An important influence of this reform was that rural water conservancy projects were less invested by the village committee and individual farmers but more so by financial investments from the central, provincial, and municipal government [72]. Direct investments from the government for water conservancy construction reached RMB 23.86 billion in 2010, which accounted for 88.13% of the total annual investment [73]. This caused PSMS investments to be rarely sourced from business channels. In the field survey, we obtained information that PSMS pilots were sustained by central and provincial financial project funds. Even though there are policies that end users should provide the cost of the PSMS, the local government must subsidize most of the ITC installation cost in the implementation stage in the western areas. The single initial investment channel increased the government's financial burden and extended the implementation period. From the perspective of water users, even if there are executive order requirements, they may not have enough enthusiasm for the investment and utilization of PSMS.
The field survey shows that new investment models regarded as Build-Operate-Transfer (BOT) and Public-Private-Partnership (PPP) had been created as trials in the Luotuocheng Irrigation District and Taocheng County. Using Taocheng County as an example, the contract price of one ITC is approximately RMB 4000-5000 per unit. The planned investment is composed of RMB 2000 from the central financial fund and the remainder from local governmental finance. For the 1600 tube wells in the county jurisdiction, the county government must fund approximately RMB 3-4 million (USD441,176) to construct the entire PSMS. In line with the BOT model, this capital will be funded by the instrument supplier and will be recovered by water fees during the operation period. Long-term planning for the system includes transmitting groundwater production data to the provincial water resources department, which requires further investment for the construction of mass transport networks. Additional investment models such as PPP are being discussed. It is beneficial to explore the BOT model under the current conditions. However, we learned that business companies do not have enough enthusiasm to join the model because of the long cost recovery time due to the currently low water fee prices.

Policy System
Groundwater production metering is a legal policy. One problem is that existing provisions are oriented toward the legal principles and lack specific norms and regulations. Without a policy basis, local governments have different choices in the implementation of a PSMS, forming their own methods or sidestepping significant conflicts, which causes the system operation to face a series of problems while overlooking the effects.
It is stipulated by law that the ITC should be installed and owned by the end users. This article indicates that it is illegal to punish the user if they destroy their own instruments. We do not have penalty articles for users destroying metering and monitoring facilities [74]. These shortcomings caused local governments, including Gansu and Xinjiang, to subsidize ITC installation but not pay for it directly. To encourage ITC implementation, the users who refuse to use or destroy the instrument must be penalized, even though the property belongs to the users. Due to the absence of legislation, executive punishment is the only choice but varies from province to province since the local government has much freedom in the actual operations. For example, the water bureau in Xinjiang Province used to penalize the ITC destroyer through administrative detention associated with the police, but the water bureau in Gansu Province typically cut off the power supply to the offenders.
Another shortcoming is the lack of regulations on upgrading and maintaining the ITC. Not only the initial investment but also the cost of maintenance and upgrade/renewal of the ITC in the PSMS is significant because of the large quantities. Interview data showed that the annual cost of maintenance and upgrades will be approximately RMB 1-2 million (approximately USD294,117) if all the 11,000 ITCs were equipped in Huantai County, Shandong Province. This sum was calculated based on a depreciation period of five years. Although water users are regulated to ensure appropriate facility operations, detailed rules are lacking responsibilities, procedures, and investments. Due to this problem, we found that local governments always sidestep this aspect in their management process. Local policy is non-specific when referring to the responsibility and investment of the system upgrade/renewal. Therefore, the flawed supporting policy system is a hidden danger for the long-term stable operation of the system.
China is a country with vast territory and numerous jurisdictions that make it difficult for a common policy to be suitable for every area. The central government should strengthen the interpretation of certain legal ideas and norms so that the local government could implement a suitable framework rather than disregarding it when exploring the policy system themselves. In addition, the top-level system construction should also be strengthened to avoid conflicts between different institutions, such as the conflict of the subsidy policy for farmers and collecting groundwater resource fees from farmers.

Retreating of Monitoring Data
The water end-use features are significantly different between irrigation and residential/industrial daily consumption. There is an uninterrupted and relatively flat demand curve for the latter [41,75,76]. However, irrigation water demand is seasonal and the demand curve is interrupted. The time scale of residential/industrial consumption is small, and demand can change at an interval of half an hour in one day. For irrigation, an integral cycle is one year in northern China. Thus, if we want to perform quantitative research on issues of PSMS operation and other derivative problems, such as assessing the effect of China's groundwater demand management policy, it is impossible unless we collect accurate PSMS production data for many years.
We conclude that data analysis research can seldom be found because of the difficulty of data collection. There are practical reasons for this situation. First, the PSMS has been operating widely for only a few years causing reliable data to be scarce. Second, much production data is dispersed in the township water station and even in the village committee due to the bottom-up version of the system. Finally, some local governments are concerned that the calculated actual exploitation would exceed the reported production amount and the total amount control index; thus, they oppose data collection by researchers.
There is no doubt that deep quantitative research will be performed with the construction and improvement of the system. A good example is Hebei Province. Groundwater production data across the entire province will be concentrated in the provincial water resources department. This will help facilitate data analysis. From the government's perspective, the confidence of the local government and public implementation will be developed by encouraging research and data analysis. Using cost-benefit analysis as an example, the results can help the government understand the benefit to the local economy, environment, and resources by implementing the PSMS and not view the system as only an administrative task.

Unbalanced Development
Shandong Province introduced the PSMS very early over the entire country. The ITCs currently operating are generally using electric meters that cannot directly measure groundwater withdrawal. Hebei Province was the first province to execute local groundwater production metering. Currently, however, the amount and portion of ITC installations is far less than provinces in arid and semi-arid areas. Taocheng District was one of the pilot areas for the provincial water-saving agricultural demonstration project in 2005 [77], but the county water bureau stated that no PSMS was in use in 2014. Beijing City started to install groundwater meters in 2000. After many upgrades, advanced PSMS systems are in the demonstration phase in limited areas.
Compared to provinces in arid and semi-arid areas in northwest China, provinces in the NCP fall behind in PSMS implementation, especially in the utilization of water production meters. The reasons can be summarized in three parts. First, the PSMS in the NCP was implemented earlier but restricted by early technology limitations. System upgrades require a time frame selection and additional investments. The provinces in northwestern areas have advantages as late stage implementers, which simplified the exploration process. Furthermore, NCP groundwater resource fees are not currently charged according to the national policy, and the groundwater production permit has yet to be strictly implemented for agricultural wells. Thus, water rights and water quota cannot be distributed to end users, which causes the PSMS to be less useful as a groundwater consumption controller. In the northwestern provinces, groundwater resource fees are generally collected according to strict policies. Thus, there is a demand for accurate measurement and consumption control. Additionally, the most important reason is the water scarcity pressure. Aquifers under the NCP still have large water storage even though the groundwater level had significantly declined. The urgency for strict management of groundwater resources is not intensive. However, in northwest China, the natural water shortage problem is aggravated by groundwater over-exploitation. Therefore, additional efforts were made during the implementation of management tools for the total amount control and quota management, with a shorter turnaround time duty circle to achieve management effects.

Countermeasures
PSMS implementation is currently in the beginning stage in China and is lacking references. According to the concept of the strictest water resources management, countermeasures and suggestions are provided to solve the current shortcomings as follows: 1.
The irrigation strategy should be changed from single family operations to intensified agriculture. Intensified agriculture has advantages to improve management efficiency. The operators of intensified agriculture are guaranteed to cooperate with the government to conduct management policies that can expand the investment channels of the PSMS. Including the PSMS in the cost accounting management system can ensure system maintenance. It has been proven that the utilization of PSMS has better results for water savings and optimizing planting structures in the form of intensified agriculture.

2.
The nation should improve policy system construction at different levels. The PSMS policy should be strengthened at the central level for a general design and at the county level for an individual design. The eastern areas should build groundwater policy reward systems by using the western experiences as a reference. Groundwater saving irrigation techniques and stakeholder participation irrigation strategies should be constructed in the eastern areas to promote water resource savings. 3.
Monitoring data for groundwater consumption collected from end users should be summarized at the provincial level at a minimum. The data transmission and summarization model of the Chinese National Groundwater Monitoring Project can be used as an example. Data disclosure and analysis should also be encouraged.

1.
There are serious water resource shortage problems in northern China. The government focused much attention on solving groundwater over-exploitation by implementing policies with direct demand management tools and economic leverage. Many resources and funds were invested in the implementation of Prepaid Smart Meter Systems for agricultural use, which charge primarily for water consumption. The Chinese government has achieved outstanding results for metering all the agricultural groundwater production in large irrigation areas. The procedure solved many difficulties and is at the head of developing countries. The goal of the implementation was to accelerate water savings and charge groundwater fees in the early stage to accurately control and manage the subsequent quota.

2.
Typical areas in six provinces were selected in the northern China study area. First-hand materials were collected via methods of field surveys and interviews and second-hand materials were collected from domestic article reviews. The implementation process and status of the PSMS in northern China was introduced and described. We determined that the implementation speed and stage varies throughout the typical areas. Based on the qualitative analysis of the developing stage, the AHP method was utilized to perform comprehensive estimations for six typical areas of implementation. for the Zibo-Weifang depression cone in Shandong Province. According to the weight of the indexes, the results showed that differences in the acknowledgment of farmers, the installation proportion of tube wells, the social benefit, and investments from the government are the major factors that influence the implementation effect.

3.
Although the PSMS has produced some substantial gains in conserving groundwater, its implementation in northern China contains shortcomings, such as an imperfect policy system, hardware reliability, etc. Additional progress should be included in the legislation and institutional construction to achieve management targets. A cost-benefit analysis and effect should be evaluated to support the administrative governance of local agencies, especially for quantitative data analysis.