Valuing the water supply: ecosystem-based potable water supply management for the Legedadie-Dire catchments, Central Ethiopia  

作　　者：Yilikal Anteneh Gete Zeleke Ephrem Gebremariam 

机构地区：[1]Water and Land Resource Center(WLRC),Addis Ababa University,3880 Addis Ababa,Ethiopia [2]Chair of Environmental Planning and Landscape Design,Addis Ababa University,Addis Ababa,Ethiopia

出　　处：《Ecological Processes》2019年第1期104-127,共24页生态过程（英文）

摘　　要：Background:There is a substantial interest in the values that consumers place on drinking water quality and supply.Financial resources are crucial to improving the urban potable water supply in developing countries that are characterized by low-cost recovery rates and a high and rapidly growing demand for more reliable services.This study examined households’willingness to pay(WTP)for the improvement of water services by identifying their water choice decisions and the mode of water supply that they prefer the water supply authority to use among several alternative water supply options.Stated-preference data were collected from 322 randomly selected households in Addis Ababa,who were presented with three sets of choices(three alternative bundle choices,including the reference scenario).The data were analyzed using the mixed logit WTP space model.Three approaches to modeling the distribution of WTP(fixed,uncorrelated,and correlated)using mixed logit WTP space models were compared.Results:Three-quarters of the households agreed to contribute money toward ecosystem-based water supply management(EBWSM)intervention programs on a monthly basis.The average contribution that the respondents were willing to pay was 150.5 Ethiopian Birr(ETB)as a one-off lump sum to kick off the EBWSM activities.Most of the respondents chose a bundle of water supply options that provides risk-free and high-quality water with no months of shortages than moderate water quality that is safe to drink and palatable with 1 month shortages annually.This implies that households would need to be supplied with risk-free,high-quality water without interruption at an appropriate flow pressure.The model with correlations fitted the data well with the highest simulated log-likelihoods at convergence and gave the best estimate of the households’WTP for water improvement.Nearly 46%of the sampled households were willing to pay more than 33 ETB per month,and 49%of the households were willing to pay between 21 ETB and 33 ETB per month for the monthly wate

关 键 词：Ecosystem service Water supply Mixed logit WTP-space model Catchment management Legedadie reservoir 

分 类 号：O17[理学—数学]