RESOURCE:

The resource appropriated from A Tramo in Diaz Ordaz is water for irrigation. This resource consists of a sluice along a main canal.

SCREENER:

Case: A Tramo in Diaz Ordaz, Mexico

The information regarding the following common-pool resource system was taken from empirical evidence from a field setting. Data on the system was extracted from a chapter in a book. Currently, there are additional documents to cite which may provide further information about this common-pool resource.

These documents describe one resource in detail. The primary resource is the A Tramo in Diaz Ordaz, situated in Diaz Ordaz of Mexico. More generally, it is located in Central America & Caribbean. The system's sector is that of water. Relatively good information has been collected about the stakes of participants who appropriate from A Tramo in Diaz Ordaz. The condition of this resource is well understood. Complete information is available regarding the strategies used by key groups interacting with the system. There is thorough documentation of the operational rules for this resource. This is the result of a high level of confidence that the authors who recorded the features of A Tramo in Diaz Ordaz have a complete knowledge of its particulars. Furthermore, the authors have provided sufficient data to formulate a structured coding process.

There are 25-50 total appropriator teams appropriating from the resource . Appropriator teams for the resource are always formally organized.

The irrigation system in Diaz Ordaz (Oaxaca, Mexico) is divided into numerous subunits called tramos. Downing describes features of a typical tramo and how the users alternate between riparian and prior appropriation rights for water. He hypothesizes that water scarcity during the moisture-sensitive period of the main crops "forces some kind of rigid social organization to allocate water."

CITATION(S):

Downing, T. E. (1974) "Irrigation and Moisture-Sensitive Periods: A Zapotec Case." In IRRIGATION'S IMPACT ON SOCIETY, edited by T. E. Downing and McGuire Gibson, 113-122. Tucson: University of Arizona Press. [GN 443 .I718]*

RESOURCE INFO:

The resource appropriated from A Tramo in Diaz Ordaz is water for irrigation. It is produced physically and is a renewable moving (fugitive) unit. This resource consists of a sluice along a main canal.

The boundary of this resource has natural/constructed and institutional arrangements which do not limit entry. The boundaries of this resource are smaller than the location, and exist in one country, and are not divided among multiple general purpose local jurisdictions at a single level. The boundaries of this resource are independent of a development project designed by non-residents.

There are not distinct and stable micro-environmental or ecological zones within this resource (educated guess).

There are strategic points within the resource where the main flow of the water for irrigation can be controlled (inferred). There is not considerable variation over space in the availability of water for irrigation within the resource (educated guess). There is considerable, but unpredictable variation in the flow of water for irrigation within a single year (highly confident). There is considerable, but unpredictable variation in the flow of water for irrigation from year to year (highly confident).

The topography of the resource or the land immediately around the resource is moderately sloping (educated guess).

The boundaries of the production resource are totally seperated from the boundaries of the appropriation resource (highly confident). The boundaries of the production resource are not equivalent to the boundaries of the location, but lie within the boundaries of the location (educated guess). The boundaries of the distribution resource are not identical to the boundaries of the appropriation resource, but appropriation is within the boundaries of distribution (inferred). The boundaries of the production resource are not equivalent to the boundaries of the distribution resource. The production resource is a facility connected to the distribution resource (highly confident).

The headworks (production resource) are not operated by the same agency(s) (or the same group(s) of people) as the appropriation resource (highly confident). A regular agency(s) of a local government (e.g. Los Angeles County Flood Control District) operates the headworks for this system (highly confident). The irrigators being served by this production organization participate in the selection of the officials of the production agency through special direct elections by irrigators (educated guess). The distribution system is not operated by the same agency(s) (or the same group(s) of people) as the appropriation resource (highly confident). A regular agency(s) of a local government (e.g. Los Angeles County Flood Control District) operate(s) the distribution system (highly confident). The irrigators being served by this production organization participate in the selection of the officials of the distribution agency through special direct elections by irrigators (educated guess). The distribution system is solely operated by the same agency(s) (or the same group(s) of people) as the headworks of the system (inferred).

LOCATION:

The appropriation resources are situated in the town of Diaz Ordaz, also known as Santo Domingo del Valle. The boundaries of the location are defined by a town. The appropriation resource present in this location consists of canals that deliver water for irrigation.

The system is located within more than one country. Within this country, the system's location is not divided among several general purpose local jurisdictions at the same level. A permanent population lives year round in this location (highly confident). There is frequent contact and communication between people in this location and officials in a nearby administrative center (ambiguous). This location is also characterized by an economy that is stable and tied to other economic networks during the entire time period (educated guess).

The latitude of this location is Oaxaca: 17.05'N, and its longitude is Oaxaca: 96.41'W. The elevation of this location is 1524 meters (highly confident). The highest elevation is 0. The lowest elevation of this location is 0. The region's average annual rainfall is 673 milimeters (highly confident). The region's average annual evapotranspiration is 672 milimeters. The distribution of rainfall and evapotranspiration per month is as follows:

January precipitation: 2, evapotraspiration: 19

February precipitation: 4, evapotraspiration: 20

March precipitation: 14, evapotraspiration: 32

April precipitation: 33, evapotraspiration: 45

May precipitation: 81, evapotraspiration: 86

June precipitation: 149, evapotraspiration: 94

July precipitation: 98, evapotraspiration: 92

August precipitation: 106, evapotraspiration: 89

September precipitation: 126, evapotraspiration: 79

October precipitation: 48, evapotraspiration: 60

November precipitation: 6, evapotraspiration: 31

December precipitation: 5, evapotraspiration: 25

RESOURCE:

The resource appropriated from A Tramo in Diaz Ordaz is water for irrigation. This resource consists of a sluice along a main canal.

OPERATIONAL LEVEL:

TYPE OF SITUATION

The processes described in the related documents are primarily related to appropriation, distribution, and production. The formal owner(s) of the resource discussed in this study is a local government. The set of individuals who have rights to withdraw from this resource is well-defined. As of the beginning of this period, the owners are exercising (or attempting to exercise de jure) and effective in gaining closed access to this resource. Since the beginning of this period, the appropriators are exercising (or attempting to exercise de jure) effective closed access to this resource.

EVENTS MARKING THE BEGINNING ACTION SITUATION

It is estimated that the operational level coded on this form ended in -1. The estimated duration of the patterns that are described in this form is 26 to 50 years. Throughout the duration there were no changes made in operational, collective, or consititutional rules. There was a planned change in resource size and structure. There was no new technology introduced to the system over the duration of the patterns coded on this form. There was no substantial external change in the value of the units appropriated. The quantity of units available did not change due to a change in appropriation patterns of other appropriators' withdrawals from the same production or distribution resource. There were no new groups starting to withdraw units from the appropriation resource. There was no recorded change to one or more variables internal to the operational level. The author does not begin the description of this case at this point in history.

CONDITIONS AT THE BEGINNING AND END OF PERIOD COVERED BY THIS FORM*

For biological resources at the beginning of this period, the balance between the quantity of units withdrawn and the number of units available was not included in the case information. For biological resources at the end of this period, the balance between the quantity of units withdrawn and the number of units available was apparently balanced (educated guess). For physical resources at the beginning of this period, the balance between the quantity of units withdrawn and the quantity of units needed, given the usual patterns of use for these units was not included in the case information. For physical resources at the end of the period the balance between the quantity of units withdrawn and the quantity of units needed, given the usual patterns of use for these units, was apparently balanced (educated guess).

The following includes the available statistics on the use of this resource at the beginning of the time period, followed by the end of the time period:

Square meters of fields irrigated at the beginning of the period: 20000 (educated guess)

Square meters of fields irrigated at the end of the period: 20000 (educated guess)

*In fisheries and other biological systems, this is the maximum sustainable number of units. In irrigation, this refers to the optimal water requirements of the crops in the established fields served by this system.

At the beginning of the period, the units were predominantly used to produce other units.

At the end of the period, the units were predominantly used to produce other units.

As of the beginning of the period, the quality of the units being withdrawn from the resource was not included in the study. As of the end of the period, the quality of the units being withdrawn from the resource was passable (educated guess). At the beginning of the period of the study, there was no information provided regarding whether or not there are problems of pollution in this or other resources, due to the way units are being appropriated. At the end of the period of the study, there were no problems of pollution in this or other resources due to the way units are being appropriated (inferred). As of the beginning of the period, the extent of technical externalities resulting from the appropriation activities of participants from this resource was not indicated. As of the end of the period, the extent of technical externalities resulting from the appropriation activities of participants from this resource was relatively low (educated guess). At the beginning of this study, the interference between the appropriation technology for this resource and the appropriation processes for other resources in this location was not recorded in the case information. At the end of this study, the interference between the appropriation technology for this resource and the appropriation processes for other resources in this location was moderate (educated guess). At the beginning of this study the appropriation resource was being maintained at a level that was not recorded in the case information. At the end of this study the appropriation resource was moderately well maintained, and in good working order (educated guess). At the beginning of this period the appropriators shared levels of trust that are not indicated in the case study. At the end of the period the appropriators shared moderate to high levels of mutual trust (e.g. oral promises given high credence) (ambiguous). ## Unknown markup: Start ##By the end of this period no change had occurred in the property rights regime related to the appropriation resource (inferred).

INFORMATION LEVELS

There is no information in the study to indicate the availability of maps or charts of the appropration resource for use by the appropriators. Maps and/or charts of the production and distribution resources are not documented as being available, or unavailable in this case study. The appropriators of this resource can be seen by each other while withdrawing units from the resource (educated guess). No appropriators are in radio communication with each other while appropriating from the resource (educated guess). There are actions being taken, by appropriators or officials, to generate information about the condition of the resource (inferred). There are sometimes records of the withdrawals from this resource kept in a systematic way (educated guess). There was no information in the study about whether or not there are records of the physical factors which directly affected the resource kept in a systematic way. There was no information in the study about whether or not there are records of the appropriators' contributions to monitoring of the resource kept in a systematic way. There are usually records of the appropriators' contribution to the maintenance of the resource kept in a systematic way (educated guess). There is no information in the study to indicate whether or not records are kept in a language accessible to most of the appropriators. The keepers of these records are officials at some level (ambiguous). The case study did not indicate whether or not these records are available for inspection by appropriators. There are arenas being used for the exchange of information about conditions of the resource (inferred). Appropriators get together to discuss mutual problems of the resource weekly (educated guess). The appropriators have an intimate knowledge of the characteristics of this resource (inferred).

POTENTIAL ACTIONS AND LEVELS OF CONTROL

There are no specialized staff or workers to undertake maintenance (inferred). The quality or quantity of the units available to the appropriators are not documented as having experienced any effect of past appropriators. There are not problems of pollution resulting from activities of others who are not appropriators of this resource or inhabitants of this location (e.g. acid rain, sewage disposal) (educated guess). The study does not indicate whether or not there was an insurance mechanism available to the appropriators related to variability of income from the resource.

PATTERNS OF INTERACTION

Differences between subgroups relating to gender identification does not affect communication (educated guess). Differences between subgroups relating to ethnic identification does not exist (inferred). Differences between subgroups relating to clan identification does not affect communication (educated guess). Differences between subgroups relating to racial identification does not exist (inferred). Differences between subgroups relating to caste identification does not affect communication (educated guess). Differences between subgroups relating to religious identification does not affect communication (educated guess). Differences between subgroups relating to languages spoken does not exist (inferred). Differences between subgroups relating to general cultural views of the resource system and its use does not exist (inferred). Differences between subgroups relating to any problems that affect communication does not affect communication (educated guess).

The general manner in which appropriators related to one another during this study is a relatively neutral, quid-pro-quo manner -- each exchange was evaluated for what it might bring (ambiguous). If someone violates the rules-in-use related to the appropriation process from this resource, it is likely that an official monitor or guard would move to impose sanctions (educated guess). There is a considerable range of sanctions imposed depending on rule infractions and in regard to social, physical, and official sanctions (inferred).

POSITIONS AND PARTICIPANTS

At the end of the period studied the position of non-appropriator (individuals prevented from using the resource) did not exist. At the beginning of the period there was a general estimate of some undocumented number appropriators. There was a general estimate of 25-50 appropriators at the end of the period (inferred). The "official" position of monitor (apart from the willingness of all appropriators to monitor) does exist, and appropriators (not necessarily all) rotated into this position (inferred).

The general estimate for the number of official monitors on duty at one time during peak hours was 1-5 (inferred). None of the monitors were full-time (highly confident).

NUMBER AND RELATIONSHIPS AMONG SUBGROUPS

There will be 1 subgroup form(s) completed in relation to this operational level form. The ID number(s) of the subgroup(s) coded are as follows: 5.1 - 0 - 0 - 0

EVALUATION OF RESULTS

There are no appropriators who were consistently disadvantaged in this period (educated guess). The relatively worst off appropriators have not been cut out of their benefits from this resource or substantially harmed (educated guess). By the end of the period studied the distance between those who were the least advantaged and those who were the most advantaged could be characterized as remaining relatively constant over time (educated guess).

AUTHOR'S EVALUATION AND CAUSAL ASSUMPTIONS

In this coding form the author focuses on the readers' concept of results and the evaluation of results.

The author evaluates the results based on crop yields and whether there was sufficient water during the moisture sensivitive periods of the crop. The author evaluates the efficiency of this system based on crop yields..

SUBGROUP:

Participants:

This appropriation group are irrigators in the tramo. The criteria for who is a member is well defined (inferred). . This group ended with a estimated membership of 25-50..

The following statements characterize the composition of this subgroup's population with respect to variables that may affect the capacity to communicate effectively:

The difference in composition with regard to gender identification does not affect communication (educated guess). Ethnic or cultural identification causes no difference in composition (inferred). The difference in composition with regard to clan identification does not affect communication (educated guess). Racial identification causes no difference in composition (inferred). The difference in composition of the group with regard to caste does not affect communication (educated guess). The difference in composition with regard to religious identification does not affect communication (educated guess). There is no difference in composition with regard to languages spoken (inferred).

.

Legal Rights:

Members of this subgroup have de jure rights of access (inferred). The right to withdraw is held by this subgroup de jure (inferred). Rights to participate in management of this resource is held de jure (inferred). Exclusion from use of the entire resource is exercised de jure (inferred). The separable right of transfer to the flow of units from this resource is held de jure by this subgroup (inferred). The separable rights to exercise transfer to shares of this appropriation resource, or closely related production and/or distribution resources are neither held de jure nor de facto (educated guess). Transferring shares of major appropriation equipment which are necessary to engage in appropriation is not exercised either je jure nor de facto## Unknown column: EQUIPSHAR ##.

Stakes and Resources:

The length of time this subgroup has regularly appropriated from this resource is 26 through 50 years (educated guess). Around 91%-100% of members reside in or adjacent to this resource (educated guess). Most people in this subgroup are very dependent (i.e. most of the family income) on this resource (inferred). Around 51%-75% of this subgroup work a substantial amount of time in activities not associated with appropriation from this resource (educated guess). The proportion of this subgroup that currently appropriates similar units from other resources is less than 10% (inferred). Given the economy of the location, the average annual family income (including all non-monetary forms of income) is considered average (educated guess). The variance of the average annual family income across families is low (ambiguous). Over time the variance in average annual family income is low (ambiguous). No real alternatives for the supply unit are available (educated guess).

Potential Actions and Levels of Control:

A noticeable impact on the balance of the quantity of units withdrawn and the number of units available in this resource would occur in a drastic reduction of this subgroup's appropriation activities (ambiguous). Keeping in mind the physically available levels of withdrawal that are possible from this resource, the following shows the extent to which rules concerning different aspects of withdrawal constrain appropriation: technological rules cause unknown contraints, time limits which limit the range of choice moderately constrain (educated guess), quantity limits which limit the range of choice moderately constrain (educated guess), and marginal units or units obtained by increasing levels of appropriation have a high value immediate return (inferred).

Technology:

The appropriative power of the technology used threatens the balance between units withdrawn and units available even if no new users are added (inferred).

Strategies Adopted:

At the end of the period the rate of unit withdrawals was constant (educated guess). In irrigation, appropriation resources (at the beginning of the period) produce mostly grains other than paddy rice, and also legumes. In irrigation, the appropriation resources (at the end of the period) produce mainly grains other than paddy rice, and also legumes. During this time period members have invested resources, such as their own labor, in maintaining or improving the structure of the appropriation resource (highly confident). Investment into constructing or improving production or distribution works for maintaining or improving their resource has been made by members (highly confident). Resources have been expended (including time) to avoid actions that would harm the structure of the appropriation resource (ambiguous). The maintenance or improvement work is either dependent or contingent on the quantity of units appropriated (highly confident). Members do not have access to an alternative source of supply (inferred). At least one member has assumed entrepreneurial activity in trying to achieve coordinated strategies in relationship to both withdrawal and investment (highly confident). In characterizing the usual behavior of the members of this subgroup with respect to local operation level rules-in-use (other than in extreme shortage), it can be said that almost all of the members follow the rules set in place (inferred). The level of infraction of members who are not rule followers is generally small (inferred).

Subgroup Results:

This subgroup appropriates 91%-100% of its total appropriated units at the end of this period (highly confident). By the end of this time period the appropriates from this resource have remained approximately constant (educated guess). The absolute quantity of appropriation units obtained by this group has remained constant (educated guess).

RESOURCE:

The resource appropriated from A Tramo in Diaz Ordaz is water for irrigation. This resource consists of a sluice along a main canal.

OPERATIONAL RULES:

Concerning national collective choice relating to the resource, there is a national level of government, but it does not exercise jurisdiction in relation to the type of resource appropriated by this subgroup. Concerning regional collective choice, there is a regional level of government, but it does not exercise jurisdiction in relation to the type of resource appropriated by this subgroup.

With regard to local collective choice, a level of government or organization of appropriators exists at the location and the author provides relatively full information about operational level rules as devised by collective choice mechanisms which have been coded below.

Boundary Rules

The following rules define the requirements that must be met before individuals are eligible to harvest or withdraw units from the appropriation resource.

The national and regional level(s) of government or organization had no jurisdiction over the resource.

A rule exists requiring ownership or leasing of land in the location of the resource. This rule is enforced at the local and rules-in-use level(s).

Entry rights may be transmitted to anyone designated by the original owner.

Within one generation of potential resource appropriators, entry rights can be given, leased, rented, sold or transferred to others.

When transfer on a temporary or permanent basis is allowed, the person who makes the transfer determines to whom such rights can be transferred.

Authority and Scope Rules

The default conditions for both authority and scope rules do not apply.

The following paragraphs include information on rules of 1 cycle(s).

Authority Rules:

The national and regional level(s) of government or organization had no jurisdiction over the resource.

The authority and scope rules do not apply to whether or not certain subgroups received substantially unequal privileges, because there is only one subgroup.

Scope Rules:

The national and regional level(s) of government or organization had no jurisdiction over the resource.

There is a rule requiring a periodically assessed appropriation tax, based on the amount of land held. This rule is enforced at the local and rules-in-use level(s), and is part of the most restrictive, regularly adopted/used set of rules.

There is a rule requiring regular maintanence labor input based on the amount of land held. This rule is enforced at the local and rules-in-use level(s), and is part of the most restrictive, regularly adopted/used set of rules.

There is a rule requiring emergency repair labor based on the amount of land held. This rule is enforced at the local and rules-in-use level(s), and is part of the most restrictive, regularly adopted/used set of rules.

Information Rules

Payoff Rules

The default condition, that all appropriators can retain whatever they can physically keep hold of and no external rewards, taxes, or sanctions are imposed is not imposed in this case. The authors have the following confidence level for the results of this section: confident. Incarceration is imposed for over one week, as penalty on appropriators for breaking rules related to the appropriation of this resource. Appropriators may not lose their entry or appropriation rights for breaking rules related to the appropriation of the resource. Appropriators cannot obtain external aid to develop their appropriation technologies. Appropriators cannot obtain external aid to develop technologies for using the resource units. Appropriators are not party to price support contracts or guaranteed purchase agreements for the selling of resource units or commodities produced by resource units.

The following percentages indicate the percentages assigned to individual positions. If more than one percentage is listed per position, the individual percentages refer to the different arrangements existing within the operational rules.

Aggregation Rules

The default condition, that no rules specify contraints or requirements on the process to be used in deciding which actions will be taken, and that appropriators can have as much independence in deciding upon actions as they are physically able to exert, is imposed in this case.

Overall Questions About Rules Configuration

The general framework of the rules-in-use has governed the activities of this subgroup for 26 to 50 years.