Their conservation tactics include the protection of private lands, the creation of conservationminded public policies, and the funding of conservation projects around. A common approach to assessing hydrologic alteration involves a comparison of. The iha r package does not currently implement the efc component of the software. In no event will tnc be liable for indirect, special, incidental, or. The indicators of hydrologic alteration iha software program was originally developed by the nature conservancy in the 1990s to quickly process daily hydrologic records to enable. Example of ha factors nature conservancy 2009 36 figure 8. This course provides the training for the nature conservancy s indicators of hydrological alteration iha software. Indicators of hydrologic alteration iha is a software program that allows water resource managers, hydrologists, ecologists, researchers and policy makers to assess how rivers, lakes and groundwater basins have been affected by human activities over time. This estimate is based upon 6 the nature conservancy program manager salary reports provided by employees or estimated based upon statistical methods.
Development of representative indicators of hydrologic. Army corps of engineers, baltimore district corps collaborated to determine ecosystem flow needs for the susquehanna river and its tributaries. Indicators of hydrologic alteration iha is a software program, developed by the nature conservancy, that provides useful information for those trying to understand the hydrologic impacts of human activities or trying to develop environmental flow recommendations for water managers. Our vision is a world where the diversity of life thrives, and people act to conserve nature for its own sake and its ability to fulfill our needs and enrich our lives. A global, sciencebased organization, the nature conservancy works in more than 70 countries to protect ecologically important lands and waters for nature and people. Indicators of hydrological alterations ihas were computed by using the iha software the nature conservancy, 2009. The indicators of hydrologic alteration iha software program was originally developed by the nature conservancy in the 1990s to quickly process daily.
The software uses the median as a measure of central tendency for the iha parameters parametric statistics. The nature conservancy is now the custodian of this statistical tool, which is very useful for assessing the degree to which human activities have changed flow regimes usepa, 2002. Indicators of hydrologic alteration iha hydrologic engineering center hec. Donations submitted through donation forms on this site are tax deductible to the extent allowed by law and are processed in u. Brian, etal, 199697 have identified four basic for this analysis and they are. This course provides the training for the nature conservancys indicators of hydrological alteration iha software. The nature conservancy has unveiled a slick new interactive map highlighting states with high windenergy potential and images and information.
The nature conservancy joins forces with governments, nonprofit organizations, local stakeholders, indigenous communities, corporate partners, and international organizations to find solutions to conservation challenges. Application of the indicators of hydrologic alteration software in. This plot of annual 7day low flows illustrates a declining trend that has been largely attributed to ground water overdraft in the san pedro valley in arizona. Project home search the entire project projects people documents advanced search. Its water program is backed by 400 staff working across more than 500 freshwater conservation projects. Flow regime alteration due to anthropogenic and climatic. Army corps of engineers, baltimore district corps collaborated to determine ecosystem flow needs for. Based on this understanding, observed and simulated flows are then analyzed with the help of the indicators of hydrologic alteration iha software of the nature conservancy 2009.
Indicators of hydrologic alteration national conservation. Indicators of hydrologic alteration iha is a software program that provides useful. The nature conservancys indicators of hydrologic alteration iha and us geological surveys usgss hydrologic assessment tool hat for use in the texas instream flow program tifp and to evaluate the flow regime in six priority subbasins. Indicators of hydrologic alteration iha conservation gateway. Iha is used to assess how rivers, lakes and underground basins have been affected by human activities over time or to evaluate future water management scenarios. The nature conservancy program manager salaries glassdoor. This thesis applies the indicators of hydrologic alteration iha software and the tceq water availability modeling wam system allied with hydrologic engineering center data storage system hecdss to analyze and quantify flow conditions at gaging stations. The purpose of this project was to assess the applicability of hydrologic analysis tools such as the nature conservancys indicators of hydrologic alteration iha and us geological surveys usgss hydrologic assessment tool hat for use in the texas instream flow program tifp and to evaluate the flow regime in six priority subbasins. With the exception of bankfull flows, the statistics were computed using the nature conservancys indicator of hydrologic alteration iha software. The nature conservancy is teaming up with microsoft to bring machine learning and other tech innovations to the environmental groups online mapping tools. The first, ihaefc, implements the method used in the iha software program. Application of the indicators of hydrologic alteration. This program was developed by scientists at the nature conservancy to.
Iha has been facilitated by software developed and distributed by the nature conservancy tnc, the nature conservancy, 2009. Citeseerx assessment of hydrologic alteration software. Classification of reaches in the missouri and lower. We used this analysis to evaluate any trend in streamflow at each gage across the most recent 20 year period of record 199420. This package implements the nature conservancys indicators. Download iha software english download iha software spanish because software is inherently complex and may not be completely free of errors, it is your responsibility to verify your work and make backup copies, and tnc will not be responsible for your failure to do so. Texas water explorer methodology the nature conservancy. Iha parameters were calculated using the indicators of hydrologic alteration software version 7, the nature conservancy 2007. Assessment of hydrologic alteration software final report. The project outcome is a set of recommended flows to. The nature conservancy has developed a statistical method and software, called the indicators of hydrologic alteration iha, for assessing the degree to which human activities have changed flow regimes. The indicators of hydrologic alteration iha software program was ori ginally developed by the nature conservancy in the 1990s to quickly process daily. For instance, the iha software can calculate the timing and maximum flow of each years largest flood or.
The indicators of hydrologic alteration iha, a software program developed by the nature conservancy, provides useful information for those trying to understand the ecological implications of a particular flow pattern or water management scenario. The iha method is based upon the concept that hydrologic regimes can be characterized by five ecologicallyrelevant attributes. Longterm and twoperiod analysis of hydrologic conditions. The nature conservancy international hydropower association. The nature conservancy conservancy, the susquehanna river basin commission srbc, and the u. The nature conservancys web page at describes the software and has illustrations of its use. It should be noted that the flood statistics in table 2 were not computed using annual peak flow data since the iha software only used dailymean streamflow data. This package implements the nature conservancy s indicators of hydrologic alteration software in r. Responding to recent congressional and media criticism, the nature conservancy has decided to terminate several of its more controversial practices, including lending money to its executives and selling land to trustees, the washington post reports following a series of expos s in the post and questions raised subsequently by two u.
The folder also contains files for another iha tutorial included with the software that will not be used in this tutorial. The nature conservancy also has developed software for estimating statistical indicators describing flow, and the indicators of hydrologic alteration iha software application and supporting information can be downloaded from the nature conservancy. Show full abstract software program was originally developed by the nature conservancy in the 1990s to quickly process daily hydrologic records. The iha software is also available for download from the nature conservancy website.
The indicators of hydrologic alteration iha software program was originally developed by the nature conservancy in the 1990s to quickly process daily hydrologic records to enable characterization of natural water conditions and facilitate evaluations of human. The nature conservancys indicators of hydrologic alteration iha software was used to analyze the entire record of hydrologic. Lower sabine, middle trinity, middle and lower brazos, lower guadalupe, and lower san antonio. Appendix b reports on tests to verify the correct calculation of selected iha statistics obtained through the tnc iha software. The nature conservancy has developed an approach, led. Input data were daily streamflow in natural conditions from 1990 to 2009. To keep pace with the scale of todays challenges, the conservancy employs a diverse set of pragmatic. The observed iha variables were not scored directly, due to the influence of drainage area and weather conditions during the period of record. The group 4 iha parameters measure the frequency and duration of high and low pulses. The indicators of hydrologic alteration iha software program was originally developed by the nature conservancy in the 1990s to quickly. The base data, daily discharge in cfs, was downloaded from usgs and ibwc for each.
Pre and postimpact periods are compared in this approach to evaluate the. The iha parameters, listed in table 1, are the subject of this study see iha users manual the nature conservancy, 2006 for definition of the parameters. This package implements the nature conservancys indicators of hydrologic alteration software in r. The tutorial you are doing now has been tailored for analysis of a california relevant river system. Nearly 2,000 water resource managers, hydrologists, ecologists, researchers and policy makers from around the. Pdf application of indicators of hydrologic alterations in the.
A common approach to assessing hydrologic alteration involves a comparison of flow regimes between. This program was developed by scientists at the nature conservancy to facilitate hydrologic analysis in an ecologicallymeaningful manner. The software program assesses 67 ecologicallyrelevant statistics derived from daily hydrologic data. Estimate ecosystem flow requirements determine influence of main activities identify areas of. The nature conservancys indicators of hydrologic alteration iha software was used to analyze the entire record of hydrologic data as ecologically relevant parameters and to categorize the flows. Computer programs allow scientists, engineers and stakeholders to evaluate potential water management scenarios. Its integrity questioned, nature conservancy drops. Description usage arguments details value authors references examples. The 33 iha parameters were calculated for each gage and each calendar year.