In coastal urban regions, underground stormwater treatment units are suitable infrastructure options because they take less space where premium land is expensive. Even then, they should be accessible and ideally small enough to fit into existing stormwater networks. Since 2003, the City of Tampa and Florida’s Department of Transportation (FDOT) have installed 47 baffle boxes into the city’s stormwater pipe networks. Baffle boxes are underground stormwater treatment structures designed to capture sediments and floating debris. Since their deployment, many challenges regarding their practical sediment capturing performance was raised by the city. The objective of this research was to evaluate the effects of rainfall, land use, and maintenance on the sediment trapping efficiency of the baffle boxes and identify solutions to enhance their performance. This was addressed through site visits, sediment accumulation measurements and analysis of historical and field data. The results of these measurements and analysis were then compared to rainfall intensity, catchment characteristics, size and type of the units. During the preliminary site visits and sediment measurements it was observed that most of the units located in the south of Tampa were inundated by backflows from Tampa Bay. Survey information collected from inspection crew members also showed that resuspension of trapped sediments frequently occurs in these units. Concerning operation and maintenance (O&M), it was indicated that units mounted with screens are costly and difficult to clean-out. Additionally, it was found that 80% of the units have very small trap inlets and lack the baffle structures needed to slow down and settle sediments. Historical sediment measurements and O&M practices were analyzed to calculate the overall performance of the units. The analysis of the data determined the sediments captured, the resuspension rate, and yearly cost of maintenance for different types of baffle boxes. Rainfall intensity and land use and land cover (LULC) data for each catchment of the units was correlated to the performance of the units. The LULC data used impervious fraction and tree canopy area of the catchments to project sediment and leaf matter accumulation within the units. This research study found that total daily rainfall intensity is a good predictor of sediment accumulation. Cleanout crews can use this relationship to conduct their work efficiently and to promptly react to occurring rainfall events. Thus, the prediction of sediments accumulated from rainfall events and the coordination of clean-out trucks can optimize O&M practices. It was also determined that large-sized (24-40 in) units and those with three chambers (baffles) perform better at trapping sediments. Thus, installing baffles in units within the large-sized ones can enhance their performance. The study also found that baffle boxes mounted with screens can individually take up to eight hours to cleanup which makes them costly and difficult. This can be detrimental for municipalities to follow up on their O&M practices effectively. Therefore, to alleviate the clean out complexity and reduce maintenance expenditures complementary practices such as bag filters need to be explored and implemented for trials

Water security requires that sufficient quantities of water be available at critical times. This is particularly challenging for high-intensity urban and agricultural settings. In underdeveloped nations, streamflow is commonly the preferred water source, as it is readily available and delivered cost-free to users. Yet, the sources of these critical streamflows are often unknown. This issue is salient in the Northern Andes, where basic knowledge of controlling factors for the quantity, quality, and timing of runoff is lacking. High-elevation headwaters are the primary catchment areas in the Northern Andes, but the extent of water providing to municipalities in the Northern Andes is unknown. In this study, the contribution of water derived from the upper watershed to the streamflow in the Tulúa River which supplies water to 200,000 people in the city of Tulúa was quantified. The river runs 72 km through urban, agricultural, and industrial land use in the Central Cordillera of the Colombian Andes. We collected 32 and 34 water samples in August and November, respectively. The water samples were representative of high-elevation headwaters runoff, shallow groundwater discharge, and streamflow throughout the watershed. Samples were analyzed for dissolved constituents and stable isotopes. The dissolved constituents were used in mass-balance mixing models to identify the source of streamflow in the lower watershed of the Tulúa River, where it the river supports a large municipality. Results indicate that approximately 50% surface runoff largely originates as high-elevation headwater runoff, including high-elevation settings where páramos dominate the land cover. These findings underscore the need for source-water protection efforts in the upper watershed, including the páramos. This project serves as a model for other páramo derived watersheds, where source-water protection is a critical challenge.

環境資本中的水資源是自然生態必備要素，隨著經濟發展，水資源即漸成經濟財，早期重視農業的結果，如今與二、商及民生用水一起競用有限水資源，加上新的環境生態問題，均使水資源面臨短缺之危機；而台灣地處亞熱帶，雨量雖丰，但因其地形特殊（如南部地區），七八成地表逕流量迅速流入海中，因此河流枯水期長，流量小，如不經適當開發即面臨缺水的危機；水資源之管理有如多頭馬車，如中央有水利司、水資會、工業局、環保署，地方有水利局、水庫管理局等，導致每遇缺水時，即發生各單位協調困難，使問題無法有效解決。以上因素使未來水資源問題，不僅只為水源之開發，水源之維護與分配亦需獲得應有的重視，因此本文嘗試由效率面，就水源的管理及自來水供應予以探討，並提出較合理的方式以解決水資源問題。 　　對於民生用水方面，一般推估其用水量多是以每年人口成長數推算，本文則以實証方式找出除人口外之可能影響水的因素，以供未來決定國內民生用水需水量之參考。 　　本研究以水資源之功能分成水管理與自來水使用，水管理部份現行制度下己產生不少問題，本研究建議採水利區為一個管理單元，除可解決現今事權不統一主窘境外，尚可配合各河川水文特性，建立符合當地自然景觀之特色，於環境保育日漸興起之際，採集水區管理局經營實為當務之急。 　　自來水使用現今分成二個供水單位一台北自來水事業處及台灣省自來水公司，二者均為公用事業，過去政府從事各項水利建設，在眾多重大工程一起競用有限資金下，唯有採行之統一管理、分區經營才可解決，但此種經營方式形成水費需經民意機關監督，造成低水費政策，在原水成本不斷上升，己無法彌補公司之營運成本之際，本研究建議引入俱樂部財模型以配合水利區管理局分區成立民營水公司以解決目前難題。 　　實証部份，限於樣本不足，如能採月資料將更可使模型結果完滿，以本模型而言，所得仍為影響各縣市需水量最重要因素，且彈性皆小於一，足証水仍為民生必需品；其次為平均成本，只有四個縣市顯著：台中市及台南價格彈性小於一，表示必需品，高雄市及北縣基隆大於一，富有彈性，表示價格上升時，需求量減少很大；雨量部份計有臺北縣基隆市、高雄縣、澎湖、雲林四個區域顯著，且彈性為正表雨量上升，用量亦增加；溫度方面，只有台南顯著，一般而言應為正相關，有可能是溫度上升使水質差不願使用，此由歷年降雨量較其他縣市為少下，使水體無法有效溶解使水質變差可茲証明。需水量之估計不僅要考慮人口，尚應加上所得、價格、雨量、溫度甚或各用水設備（如馬桶個數）等，將可使實証結果更加完備。 　　本文主題一水屬環境資本之一支，它是否為再生系統，端視二種力量而定：一為水污染，嚴重的水污染將破壞水體，非但人類無法取用，水中生物及仰賴水而活之動植物亦無法悻免，如淡水河即是一例；二為新技術開發或原有技術改良以提高水的資本存量及生產力，如英國泰晤士河流域即是整治成功之最佳例証；如後者力量大於前者，水就是再生系統，反之其命運如礦產一般只有耗竭一途，而現今的水資源問題除應改供給導向之水資源政策為需求導向外，積極開發水源節水及循環用水、改進現行組織系統均為解決目前水資源難題之途。

Uncertainties were analyzed in three areas (remote sensing, dendroclimatology, and climate modeling) relevant to current water resources management. First, the research investigated the relationships between remotely sensed and in situ Snow Water Equivalent (SWE) datasets in three western U.S. basins. Agreement between SWE products was found to increase in lower elevation areas and later in the snowpack season. Principal Components Analysis (PCA) revealed two distinct snow regions among the datasets and Singular Value Decomposition (SVD) was used to link both data products with regional streamflow. Remotely sensed SWE was found to be sufficient to use in statistically based forecast models in which magnitude did not affect results. Second, the research investigated the dendroclimatic potential of a critical flood control and hydropower region in the southeastern U.S. (Tennessee Valley) using climate division precipitation and regional tree-ring chronology datasets. Tennessee Valley May–July precipitation was reconstructed from 1692 to 1980 (289 years) using a stepwise linear regression model (R2 = 0.56). Weibull analysis illustrated that the Tennessee Valley reconstruction model developed generally underestimated extreme precipitation and overestimated average precipitation. The longest May–July drought occurred over 10 consecutive years (1827–1836). Instrumental records indicated that the two most recent droughts (1985–1988 and 2006–2008) ranked second and third in severity in the past three centuries. Third, past, present, and future patterns and extremes in streamflow within the North Platte River Basin were investigated. A streamflow reconstruction dating back to 1383 using tree rings was created to provide a proxy for the long-term variability in the region. Projected streamflow datasets from the Community Climate System Model (CCSM) were gathered to acquire future insight of the hydroclimatic variability within the North Platte River Basin (NRPB). Drought analysis revealed that 2002–2008 was one of the driest periods in the past 600 years. Multiple CCSM projections suggest that in the future, drier (5th percentile) years will become wetter relative to 1970–1999 CCSM hindcasts. Future average (50th percentile) and wet (95th percentile) years may yield statistically higher streamflow compared to those seen in the historical (1383–1999) record, suggesting potential anthropogenic influence beyond the historic natural variability.

Section 303(d) of the Clean Water Act (CWA) requires states to assess and list all streams that do not meet water quality criteria for their designated use classes. In Tennessee, the Tennessee Department of Environment and Conservation (TDEC) uses macroinvertebrate surveys to assess the condition of streams designated for “fish and aquatic life” and the progress of targeted waterbodies toward meeting established standards for sediment. As of yet, no substrate metric has been established to monitor water quality or to document progress toward water quality improvement with respect to fish and aquatic life in Tennessee. A substrate metric that could be efficiently measured and would represent the needs of aquatic species would be valuable for monitoring streams with known sediment impairment to detect water quality improvement. The objectives of this study were to (1) investigate the relationships between riffle substrates and benthic macroinvertebrate data, provided by TDEC; (2) assess the potential use of substrate metrics as a monitoring tool for benthic habitat status; and (3) examine variation in riffle substrates over time in the Ridge and Valley Ecoregion of Tennessee. Bed and interstitial sediment were characterized at sites corresponding with TDEC macroinvertebrate sampling stations. Bed sediment characteristics were significantly correlated with benthic macroinvertebrate data; however, interstitial fines yielded no significant correlations with benthic macroinvertebrate data. Substrate metrics did not differ significantly between varying levels of impairment; however, they did differ significantly when all impaired sites were combined into a single impairment group. The lack of significant differences between varying classes of reach impairment suggests that substrate metrics may not be able to distinguish impairment at the level necessary for monitoring impairment. However, substrate metrics may be of potential use in monitoring sites where impairment is less ambiguous. To investigate change in riffle substrate over time, three sites were monitored over the course of a year. Preliminary observations showed little change in riffle substrate during the study period, suggesting that seasonal restrictions on substrate surveys are unneccessary.

Cypress Creek is an urbanizing watershed in the Gulf Coast region of Texas that contributes the largest inflow of urban runoff containing suspended solids to Lake Houston, the primary source of drinking water for the City of Houston. Historical water quality data was statistically analyzed to characterize the watershed and its pollutant sources. It was determined that the current sampling program provides limited information on the complex behaviors of pollutant sources in both dry weather and rainfall events. In order to further investigate the dynamics of pollutant export from Cypress Creek to Lake Houston, fully distributed hydrologic and water quality models were developed and employed to simulate high frequency small storms. A fully distributed hydrologic model, Vflo(TM) , was used to model streamflow during small storm events in Cypress Creek. Accurately modeling small rainfall events, which have traditionally been difficult to model, is necessary for investigation and design of watershed management since small storms occur more frequently. An assessment of the model for multiple storms shows that using radar rainfall input produces results well matched to the observed streamflow for both volume and peak streamflow. Building on the accuracy and utility of distributed hydrologic modeling, a water quality model was developed to simulate buildup, washoff, and advective transport of a conservative pollutant. Coupled with the physically based Vflo(TM) hydrologic model, the pollutant transport model was used to simulate the washoff and transport of total suspended solids for multiple small storm events in Cypress Creek Watershed. The output of this distributed buildup and washoff model was compared to storm water quality sampling in order to assess the performance of the model and to further temporally and spatially characterize the storm events. This effort was the first step towards developing a fully distributed water quality model that can be widely applied to a wide variety of watersheds. It provides the framework for future incorporation of more sophisticated pollutant dynamics and spatially explicit evaluation of best management practices and land use dynamics. This provides an important tool and decision aid for watershed and resource management and thus efficient protection of the sources waters.

To slow climate change, humans should take immediate and widespread action. One way to slow climate change is by switching to switch to renewable power plants such as solar fields. Recently, pioneering companies have built solar fields on water bodies. This study found that such a pairing of water and solar could increase production efficiency by 8-10% through panel cooling, save millions of liters of water from evaporation, and produce energy with under-utilized space.

The groundwater in agricultural karst areas is susceptible to contamination from organic soil amendments and pesticides. During major storm events during 2011, dye traces were initiated using sulphorhodamine-B, fluorescein and eosine in a groundwater recharge area where manure was applied to the ground. Fecal coliform samples were collected from significant storm events from January-September 2011. Water samples and geochemical data were collected every four hours before, during, and between the storm events from a waterfall in Crumps cave flowing from the known recharge area to track the transport and residence time of the epikarst water and organic soil amendments during variable flow conditions. Two dataloggers at the same waterfall were set up to collect 10-minute data, which included pH, specific conductivity, temperature, and discharge. Total rainfall amount and other surface meteorological data were collected from a rain station located above the cave. Cave water samples were collected for the analysis of anions, cations, bacterial count, and the presence of dye. The dye traces show variability in the characteristics of epikarstic response and flowpaths. The changes in geochemistry indicate simultaneous storage and transport of meteoric water through epikarst pathways into the cave, with rapid transport of bacteria occurring through the conduits that bypass storage. Fecal coliform counts were elevated all through the study period indicating survivability in soils through the seasons. The results indicate that significant precipitation events affect the storage properties and rapidly impact the various pathways and timing of contaminant transport through the epikarst zone, eventually allowing these contaminants to be transported unfiltered in to the groundwater supply. This study shows that current best management practices in karst lands need to be revisited to incorporate areas that do not have surface runoff but where contaminants are transported by seepage into local aquifer.

Several authors have challenged Integrated Water Resource Management (IWRM) as inoperable and technocratic for the issues surrounding water resources known as contemporary water resource politics. As a result, new methods and analytical frameworks have been suggested for IWRM that have been qualified as interdisciplinary water research. Interdisciplinary water research is proposed to be context-based and focused on politics and management. Thus, principles underlying IWRM, such as public participation are gaining more attention because those principles enable sustainable water resource decisions to achieve socio-economic and ecological equity. This exploratory case study examines public participation in IWRM by looking at two villages in Lao Peoples Democratic Republic (Lao PDR). Participatory activities used to incorporate villages into water resource decisions are evaluated at different levels of government up to an international river basin organization known as the Mekong River Commission (MRC). The study uses a critical Third World political ecology perspective to elucidate water resource politics surrounding low levels of participation found among IWRM institutions in Lao PDR. Findings also reveal public participation in water resource decisions is politically complex. The participation of villages in water resource development decisions was related to issues surrounding national policies such as poverty alleviation, land allocations, resettlement, and swidden agriculture. Meanwhile, other types of participation were found in which villages could maintain control over their water interests. The study concludes more research is required surrounding water resource politics to better identify more effective and genuine participation of people whose livelihoods are dependent on water resources.

Several authors have challenged Integrated Water Resource Management (IWRM) as inoperable and technocratic for the issues surrounding water resources known as contemporary water resource politics. As a result, new methods and analytical frameworks have been suggested for IWRM that have been qualified as interdisciplinary water research. Interdisciplinary water research is proposed to be context-based and focused on politics and management. Thus, principles underlying IWRM, such as public participation are gaining more attention because those principles enable sustainable water resource decisions to achieve socio-economic and ecological equity. This exploratory case study examines public participation in IWRM by looking at two villages in Lao Peoples Democratic Republic (Lao PDR). Participatory activities used to incorporate villages into water resource decisions are evaluated at different levels of government up to an international river basin organization known as the Mekong River Commission (MRC). The study uses a critical Third World political ecology perspective to elucidate water resource politics surrounding low levels of participation found among IWRM institutions in Lao PDR. Findings also reveal public participation in water resource decisions is politically complex. The participation of villages in water resource development decisions was related to issues surrounding national policies such as poverty alleviation, land allocations, resettlement, and swidden agriculture. Meanwhile, other types of participation were found in which villages could maintain control over their water interests. The study concludes more research is required surrounding water resource politics to better identify more effective and genuine participation of people whose livelihoods are dependent on water resources.