A widely used roadway runoff best management practice (BMP) used in Florida is an ex.filtration trench. Traditionally, exfiltration trenches are constructed without any filtration media. Therefore, the potential for groundwater contamination by the roadway runoff exists. Roadway runoff contains metals and nutrient pollutants. Nitrogen and Phosphorus are the most common nutrients causing impacts to receiving waters. To reduce the impact these pollutants will have on groundwater quality, Black and Gold™ media, which mainly consists of tire crumb, is evaluated. The Black and Gold™ media was found to be a good filtration media for removal of total nitrogen and nitrate + nitrite. It was found that all of the wells had experienced total nitrogen removal. These reductions ranged from 32% to 56%. The nitrate + nitrite reduction was experienced in the four wells. These reductions ranged from 4 7% to 88% in the three wells. The ortho-phosphorous and total phosphorus concentrations did not change significantly. Also, the metals concentrations did not change significantly.During the post sampling period, the turbidity of the groundwater increased. This was experienced in three of the four wells.

Urban development significantly increases water temperatures within watersheds, primarily from the construction of impervious surfaces for buildings and pavement. While thermally enriched runoff can be harmful to aquatic life, available research and guidance on predicting these effects is limited. The goal of this assessment is to provide guidance on how to achieve necessary temperature regimes that meet aquatic health criteria for sensitive species such as trout. To address this need, the Minnesota Urban Heat Export Tool (MINUHET) and U.S. Environmental Protection Agency's Storm Water Management Model (SWMM) models were utilized to simulate hourly streamflow, water temperature, and heat flux in an urban watershed in Blacksburg, VA for typical summer periods using continuous-based simulation. SWMM and MINUHET were combined in a unique, hybrid approach that emphasized each model's strengths, i.e., SWMM for runoff and streamflow, and MINUHET for water temperature. The watershed is 14.1 km², and is portion of Stroubles Creek located near downtown Blackburg, Virginia and the main campus of Virginia Tech. Streamflow, water temperature, and climate data were acquired from Virginia Tech StREAM Lab (Stream Research, Education, and Management) monitoring stations. SWMM and MINUHET were calibrated manually for the summers of 2016, and were validated for the summer of 2015. Model sensitivity analyses revealed that simulations were especially sensitive to imperviousness (SWMM predicted streamflow as outputs) and dew point temperature (MINUHET predicted water temperatures as outputs), both resulted in increased outputs of SWMM and MINUHET models, respectively. Model performance in simulating streamflow was evaluated using Nash-Sutcliffe Efficiency (NSE) and correlation (R²). NSE and R² values were 0.65 and 0.7 for the SWMM Model and 0.57 and 0.55 for the MINUHET model during the validation period, indicating that SWMM performed better than MINUHET in streamflow simulation. Streamflow temperatures were simulated using MINUHET with a NSE and R² statistical values of 0.58, and 0.83, respectively, demonstrating a satisfactory simulation of water temperature. Heat loads were simulated using the MINUHET and Hybrid models, demonstrating less Percent BIAS of the Hybrid approach in simulation of watershed total heat load than MINUHET alone. Furthermore, a number of practices were implemented to reduce thermal loading within a watershed. These included infiltration practices, methods for decreasing absorption of thermal energy primarily by reducing albedo, and increased vegetation canopies. An index titled Percentage of Time Temperature Exceeded 21°C Threshold (PTTET) for trout habitat was used to represent the effectiveness of thermal mitigation practices. Installing concrete pavement (thermal diffusivity: 15×10-7 m²/s, pavement thickness: 0.20 m, and heat capacity: 4.0×106 J/m³⋅°C) and Acrylic Coated Galvalume (ACG) roofs for all pavement and roofs, respectively, in the watershed reduced heat load by 45%, and the PTTET index declined 4.5%. Installing bioretention with 61 cm of media thickness, and soil-media infiltration rate of 25 mm/hr. for 53 selected parking lots in the watershed, resulted in 11.1% reduction in watershed heat load and 1.4% reduction in PTTET. Planting forest canopies for the entire pervious area of the watershed, sufficient to shade 90% of all lands, resulted in reduction in heat load by 24% and PTTET by 4.6%. / Master of Science / Development within urbanized regions increase impervious surfaces, which further cause significant storm events in watersheds. The increased impervious surfaces result in hotter stormwater particularly during hot summers, which has diverse effects on aquatic health of downstream receiving streams. The main objective of the current study is to evaluate the thermal impact of urbanization on aquatic health habitats in Stroubles Creek Watershed, Blacksburg, Virginia. To aim this goal and achieve the thermal evaluation of the highly urbanized Stroubles Creek Watershed, a U.S. Environmental Protection Agency’s Storm Water Management Model (SWMM) and a Minnesota Urban Heat Export Tool (MINUHET) models from scratch of the Stroubles Creek watershed, using Town of Blacksburg and Virginia Tech Physical Facility information were developed. This necessitated combining information from a wide variety of sources, including geologic maps, geodatabases, hydraulic models, computer-aided design (CAD) files, and scanned as-built information. In addition to the models, a hybrid model was developed that combines SWMM and MINHET outputs. The temperatures and heat loads at the downstream of the watershed were predicted using SWMM, MINUHET, and Hybrid models for two summer periods of 2016 and 2015, and the predicted temperature were compared to the criteria for survival of aquatic health such as trout. Furthermore, a number of thermal mitigation strategies such as bioretentions systems, concrete pavements (which has lighter color compared to asphalt pavements), and increased vegetation canopies were simulated within the MINUHET and SWMM models configurations to reduce simulated temperatures and heat loads at the watershed scale. The simulated temperatures and heat loads represented that concrete pavements results in better performance of thermal mitigation within watersheds than bioretention systems, and increased vegetation canopies.

Federal, state and local governments are increasingly focused on the effects of development on water quality and quantity. With waterbodies being especially sensitive to certain pollutants, such as sediment and nutrients, regulations have been put in place to control the amount of pollutant that gets discharged. Sediment is a cause for concern as it originates during both rural and urban activities, and often carries other pollutants (metals, nutrients, etc.) with it. Existing erosion models focus primarily on estimating erosion from agricultural watersheds. Methods are needed to predict areas with high erosive potential (EP) in urban watersheds. Highlighting highly erosive areas in urbanized watersheds allows for the prioritization of maintenance and installation of Stormwater Control Measures (SCMs), and monitoring of sediment by municipal planners and engineers. This study utilizes commonly available geospatial layers in conjunction with a computational procedure to compute relative EP risk throughout a target urban watershed. A case study of the developed methodology was performed on a watershed in Blacksburg, VA, to generate EP risk maps. Results of the study indicate areas of erosive potential within the target watershed and provide a methodology for creating erosion potential risk maps for use by municipal planners and engineers / Master of Science / Federal, state and local governments are increasingly focused on the effects of development on water quality and quantity. With waterbodies being especially sensitive to certain pollutants, such as sediment and nutrients, regulations have been put in place to control the amount of pollutant that gets discharged. Sediment is a cause for concern as it originates during both rural and urban activities, and often carries other pollutants (metals, nutrients, etc.) with it. Existing erosion models focus primarily on estimating erosion from agricultural watersheds. Methods are needed to predict areas with high erosive potential (EP) in urban watersheds. Highlighting highly erosive areas in urbanized watersheds allows for the prioritization of maintenance and installation of Stormwater Control Measures (SCMs), and monitoring of sediment by municipal planners and engineers. This study utilizes commonly available geospatial layers in conjunction with a computational procedure to compute relative EP risk throughout a target urban watershed. A case study of the developed methodology was performed on a watershed in Blacksburg, VA, to generate EP risk maps. Results of the study indicate areas of erosive potential within the target watershed and provide a methodology for creating erosion potential risk maps for use by municipal planners and engineers.

Thermal pollution of waterbodies occurring from heated stormwater runoff in urban catchments is a growing concern among municipalities in the United States. The U.S. Environmental Protection Agency (EPA) maintains regulatory criteria for temperature of waters of the U.S. as many species of aquatic life depend on an environment that maintains water temperatures below a certain threshold. Thermal pollution from urban stormwater runoff threatens the livelihoods of cold-water fish species, like trout, among other species of wildlife. In order to reduce thermal pollution loading to its streams, a municipality or regulatory authority must first identify the sources of thermal pollution in its waterbodies. This study predicts areas within an urban watershed in the Town of Blacksburg, VA that may be sources of thermal pollution in stormwater runoff by investigating indicators of thermal pollution potential (TPP) through and analysis of land cover types and runoff flow patterns in a geographic information system (GIS) environment. Results of the study provide a theoretical foundation for TPP risk mapping with recommendations for authorities interested in pursuing TPP risk mapping as a tool to guide and focus efforts toward reduction of thermal pollution and land planning. / Master of Science / Thermal pollution of waterbodies occurring from heated stormwater runoff in urban catchments is a growing concern among municipalities in the United States. The U.S. Environmental Protection Agency (EPA) maintains regulatory criteria for temperature of waters of the U.S. as many species of aquatic life depend on an environment that maintains water temperatures below a certain threshold. Thermal pollution from urban stormwater runoff threatens the livelihoods of cold-water fish species, like trout, among other species of wildlife. In order to reduce thermal pollution loading to its streams, a municipality or regulatory authority must first identify the sources of thermal pollution in its waterbodies. This study predicts areas within an urban watershed in the Town of Blacksburg, VA that may be sources of thermal pollution in stormwater runoff by investigating indicators of thermal pollution potential (TPP) through and analysis of land cover types and runoff flow patterns in a geographic information system (GIS) environment. Results of the study provide a theoretical foundation for TPP risk mapping with recommendations for authorities interested in pursuing TPP risk mapping as a tool to guide and focus efforts toward reduction of thermal pollution and land planning.

To address accuracy concerns of the National Land Cover Dataset (NLCD), this case study compares impervious surface from the NLCD to a Detailed Land Cover Dataset (DLCD) for the Town of Blacksburg, Virginia over two time periods (2005/2006 and 2011) at spatial aggregation scales (fine to coarse) and scopes (site-specific to area-extent). When comparing the total impervious surface area, the NLCD overestimated the DLCD by appreciable amounts (12-27%) for the entire town and across all specified land use zones for both time periods examined. A binary pixel-wise accuracy assessment of impervious surface revealed that the NLCD performed well for all scopes except for the single family land use zone (user accuracy <40%). The spatial aggregation of pixels to 90-m led to improved agreement between the two datasets. Using the DLCD as a reference, an empirical normalization equation was successfully applied to the NLCD to further reduce overestimation and data skewness. / Master of Science / To address accuracy concerns of the National Land Cover Dataset (NLCD), this case study compares impervious surface conditions from the NLCD to a Detailed Land Cover Dataset (DLCD) for the Town of Blacksburg, Virginia over two time periods (2005/06 and 2011) at various spatial scales and scopes. When comparing the total impervious surface area, the NLCD overestimated the DLCD by appreciable amounts for the entire town and across all specified land use zones for both time periods examined. A comparison at the pixel level revealed the NLCD performed well for all scopes except for the single family residential land use zone. Although there was improved agreement between the datasets at coarser resolutions, data skewness was still apparent. By using the DLCD as a ground truth reference, a mathematical correction equation was applied to the NLCD to better align it with the DLCD. Reflected through this assessment, inaccuracies within the NLCD need to be further studied to assist local and regional governments to more correctly depict land cover conditions for applications such as land use planning and stormwater management.

The McMillan sand filtration plant in Washington, D.C. is a significant industrial landscape that provided safe clean water to much of the capital during 1905-1985. At the outset, the McMillan Commission chose to make the plant and adjacent McMillan reservoir part of the park system it was mapping for Washington. Frederick Law Olmsted Jr. was appointed to landscape the tract, a task completed in 1920. Closed to the public since WWII, the site was abandoned when its operation ended. This thesis looks at its future by exploring the thickness of landscape and the site's discovered geometry. Peeling back its uniformly level 25-acre surface broken only twice by rows of concrete towers, its horizontal layers, vertical elements and strong grids are revealed, offering clues for new design strategies. Examples of how landscape geometries have been considered and works of landscape built elsewhere are reviewed. Recalling water's historically central role in the site, the latter's potential for demonstrating responsible stormwater management and other sustainable practices is emphasized. Local stakeholder interests and proven ingredients of successful urban parks are noted. A design process is outlined that exploits the earlier exploratory findings to reconcile the transition between old and new, deciding what to remove and what to add. Details are provided on the resulting new "memorial park" that both celebrates its history and responds to contemporary interests and needs of the 21st century urban landscape. / Master of Landscape Architecture

Stormwater ponds design to mitigate the negative impacts of runoff from impervious surfaces in urban areas have become common landscape features as they are required by state and local environmental regulations. While some have hypothesized that stormwater ponds may provide habitat for wildlife, few studies have systematically investigated turtle use of stormwater ponds. To investigate stormwater pond use by turtles in western Virginia, I used records of permitted stormwater management structures in the Town of Christiansburg and City of Blacksburg, Virginia, and a stratified random sample design based on hydrology to select 60 (of 324 above ground structures) for sampling of turtle assemblages. I used a combination of visual and trapping surveys to characterize turtle assemblages. I also surveyed design and management variables to identify those conditions that promote use of stormwater ponds by turtles. Visual encounter surveys involving eight or more visits conducted in June and July when air temperatures were between 20oC and 27oC produced high cumulative rates of detection and high detection probabilities during individual surveys, respectively. I found eight taxa utilizing stormwater ponds including two relatively abundant native taxa, the snapping turtle (Chelydra serpentina) and the eastern painted turtle (Chrysemys picta picta), and one non-native taxa, the red-eared slider (Trychemys scripta elegans). The occurrence of turtles was associated with larger ponds with permanent or near permanent hydrology and limited emergent vegetation cover that were located on streams and surrounded by patches of trees and turfgrass cover. These conditions are characteristics of the habitats selected by the native species found in this study, but also indicative of conditions humans may choose when releasing unwanted pet turtles. Therefore, the occurrence of native and non-native taxa may be associated with park-like conditions, but for different reasons, warranting future assessment and monitoring of turtle populations and potential genetic introgression between native and non-native taxa. / Master of Science / Stormwater ponds design to mitigate the negative impacts of runoff from polluted surfaces have become common landscape features in urban areas. While there is evidence that stormwater ponds provide habitat for fish, birds, amphibians, insects, and macroinvertebrates, not many studies have addressed their use by reptiles, particularly turtles. In this study, I investigated turtle use of stormwater ponds in Christiansburg and Blacksburg, Virginia. I conducted visual and trapping surveys of turtles and estimates of habitat conditions during the spring and summer of 2022 and 2023. I found that stormwater retention ponds were providing habitat for eight taxa of turtles, three of which appeared to be successfully nesting near ponds. Two taxa occurred at 18 or more ponds and are widespread in the eastern United States. Three taxa were not native to my study area in western Virginia and appear to have been introduced to stormwater ponds by humans, probably via release of unwanted pets. Turtle taxa were most abundant at larger ponds, with open water areas, located on streams, and surrounded by patches of trees and turfgrass. These are the conditions preferred by the native species found in my study; they may also be the conditions perceived by humans to be good places to release unwanted pets. Therefore, stormwater ponds may be providing habitat for native species, but also creating communities of native and non-native taxa that could have ramifications for the genetic integrity of native taxa.

Syfte: I dagens läge byggs nya dagvattendammar för att magasinera dagvatten som överbelastar dagvattenledningssystemen och de befintliga dagvattendammarna förblir utan översyn. Eftersom klimatförändringar bidrar till att femårsregn kommer i en högre frekvens ökar flödet av dagvatten och orsakar att allt fler dagvattendammar kommer att bli underdimensionerade. För att bevara samhällsfunktioner utreds en generell arbetsprocess hur kommuner kan undersöka och bevara befintliga dagvattendammar. Metod: Metoderna som används är intervju, fallstudie och litteraturstudie. Intervju bidrar till att lösningar och förslag av undersökningsmetoder och åtgärdsförslag samlas in. Fallstudien utfördes på tre olika dagvattendammar och undersöker vilka undersökningsmetoder som kan användas. Att samla empiri i ett praktiskt fall bör bidra till att utredningens trovärdighet förstärks. De metoderna som användes i fallstudien är beräkningar, sedimentprovtagning och dokumentanalys från underlag av befintliga dagvattendammar. Med hjälp av litteraturstudie analyseras utredningens empiri med andra källor för att kontrollera empirins tillförlitlighet. Resultat: Ett flertal undersökningsmetoder och åtgärdsförslag analyserades. Tre undersökningsmetoder som passade en generell arbetsprocess var: flödesproportionell provtagning, sedimentprovtagning och dagvattenberäkningar med dagvattenmodellen Stormtac. Åtgärdsförslag som passade var: byggnation av en vall runt dammen för att utöka magasineringen, plantering av växter som tar upp näringsämnen och tungmetaller bundna i dagvattnet, utnyttja dagvattendammens form där dagvattendammens hydrauliska effektivitet utnyttjas maximalt samt anlägga fördamm med en makadamvall med vattenlevande växter. Konsekvenser: Flödesproportionell provtagning var tillförlitlig undersökningsmetod enligt intervju och litteraturstudie. Sedimentprovtagning av sediment i botten av inoch utlopp går att nyttjas i en generell arbetsprocess, men vissa föroreningshalter kan vara missvisande beroende på hur detaljerat sedimentprovtagningen görs. Dagvattenmodellen Stormtac och dess beräkningar kan nyttjas i en generell arbetsprocess eftersom Svenskt Vatten P110 (2016) bekräftar modellens beräkningar. Åtgärdsförslagen testades inte i verkliga fall, men effekten bekräftades i intervjun och litteraturstudien. Ett förslag på generell arbetsprocess kunde sammanställas. Stickprovstagning passar sämre in i en generell arbetsprocess. Begränsningar: Fallstudien har begränsats genom att utreda två metoder, varav den ena är dagvattenmodellen Stormtac och den andra är sedimentprovtagning. Utvalda föroreningar som tungmetaller, olja, kväve och fosfor analyseras. Studien avgränsas från att analysera hur recipienter påverkas av de befintliga dagvattendammar som studerats. / Purpose: At present are new stormwater ponds constructed to store stormwater which overloads stormwater pipe systems while existing stormwater ponds remains without overhaul. Since climate changes contributes to five-year rain in a higher frequency, which increases the flow of stormwater and causing more stormwater ponds to be undersized. In order to preserve social functions, are a general work process investigated of how municipalities can investigate and preserve their existing stormwater ponds. Method: The methods that are used are interviews, case study and literature study. The interviews contribute to solutions and proposals of investigation methods and proposals for action. The case study were performed in three stormwater ponds and examines the investigation methods that can be used. Collecting empirical data in a practical case, should increase the investigation’s credibility. The methods used in the case study are calculations, sediment sampling and document analysis of the basis of existing stormwater. Using literature study are the empirical data of the investigation analyzed with other sources to check the reliability of the empirical data. Findings: Several methods of investigations and action proposals were analyzed. Three investigation methods which fit a general work process were: flow proportional sampling, sediment sampling and stormwater calculations through the stormwater model Stormtac. The proposals for action which suited a general work process were: construction of a trench around the pond to expand the storage area, planting plants that take up nutrients and heavy metals tied up in stormwater, exploit the stormwater ponds shape where the hydraulic efficiency are exploited flat out by placing the inlet and outlet on opposite ends, and building trenches with a gravel embankment with aquatic plants. Implications: Flow proportional sampling were a reliable investigation method according to interview and literature study. Sediment sampling of sediment in bottom of in- and outlet can be used in a general work process, but certain contamination levels can be misleading depending on how detailed sediment samplings are done. Stormwater model Stormtac and its calculations can be used in a general workprocess because publication Svenskt Vatten P110 (2016) are confirming the models calculations. The proposals for action were not tested in real cases, but the effect was confirmed in the interview and literature study. Limitations: The case study was limited by investigating two methods, one of which is stormwater model Stormtac and sediment sampling. Selected contaminants such as heavy metals, oil, nitrogen and phosphorus are analysed. The study is delimitated by analyzing how recipients are affected by the studied existing stormwater ponds.

The impervious surfaces of built landscapes create stormwater runoff that causes water quantity and quality problems downstream, upsetting natural hydrology and harming aquatic ecosystems. Green stormwater infrastructure (GSI) includes practices that reduce the amount of stormwater runoff and the pollutants it carries utilizing plants, soils, and other materials to capture, store, reuse, infiltrate, evapotranspire, and filter stormwater. GSI helps to restore developed landscapes, mimicking natural hydrologic processes and providing important water treatment functions as well as beneficial green spaces in urban areas. However, there are many challenges associated with the implementation and maintenance of GSI in our communities and cultures. This research explores the human side of implementing GSI, investigating current maintenance capacities in rural and urban settings, and exploring multifunctional benefits of GSI to provide both biophysical and cultural ecosystem services (CES). Research goals include characterizing the current state of GSI implementation and maintenance in municipalities in the State of Vermont (USA) and eliciting lessons that can inform GSI design practices and policies. Multifunctional GSI design objectives that provide and enhance CES are described, revealing opportunities to instill values and a sense of stewardship for the health wellbeing of people and ecosystems. The first chapter provides relevant topical background to set the stage for the latter two chapters. The second chapter analyzes results from a survey of municipal officials in Vermont that occurred as part of NSF-EPSCoR-funded Basin Resilience to Extreme Events project research on stormwater management. The survey included questions about GSI and maintenance practices in place and perceptions of visual appeal and ability to maintain bioretention systems shown in landscape visualizations. Results show that visual appeal and perceived maintainability of vegetated bioretention practices do not appear to be significant barriers to adoption and operation, but stormwater policy and funding are shown to be both significant barriers and solutions to implementing and maintaining GSI in Vermont municipalities. Additionally, urban and rural towns provide very different contexts for implementing and maintaining GSI in Vermont and characteristics of development patterns and maintenance capacity should be considered in policy, regulations, outreach, and education. The third chapter offers a literature review, guided by a CES framework, of design elements that can be included in GSI to create multifunctional urban green spaces. CES categories of aesthetic, recreation, education, sense of place, social capital, and stewardship benefits framed a set of design elements, principles, practices, and documented benefits to guide multifunctional design of GSI. Findings include the importance of participatory processes to elicit diverse landscape values, visible water pathways, biodiversity, spaces for creative use, accessibility, interaction with water, interpretive signage, and artful and biophilic design features to enhance feelings of preference, pleasure, relaxation, learning, connection, and inclusion. The health and wellbeing of water and people must be integrated into the design of GSI for cities to be ecologically functional and culturally meaningful to their populations.

Regnvatten, smältvatten och spolvatten som rinner av från hårdgjorda ytor kallas dagvatten. Dagvatten är ofta förorenat av tungmetaller eller svårnedbrytbara organiska ämnen, som kan göra stor skada om vattnet inte renas innan det når recipienten. I dagsläget finns det inga nationellt fastslagna riktvärden för föroreningshalter i dagvatten. Dagvattengruppen på Vattenfall AB Värme Uppsala har tillsammans med miljökontoret i Uppsala tagit fram riktvärden för föroreningshalter från kvarteret Brännugnen, som området som studerats i detta examensarbete kallas. Vattenfall har idag problem med att klara dessa riktvärden för bland annat metaller i en del av kvarterets dagvattenbrunnar. För att reducera utsläppet av föroreningar till dagvattennätet från kvarteret Brännugnen har därför denna dagvattenutredning genomförts. Genom platsundersökningar och provtagning på dagvattnet i sex punkter har källor till föroreningar identifierats. Förslag på åtgärder har tagits fram genom litteraturstudier, platsundersökningar och samtal och diskussioner med erfaren personal. Studien har också resulterat i förslag på en förbättrad provtagningsstrategi som ger en mer korrekt bild av utsläppta mängder föroreningar per år. Målsättningen var att den nya provtagningsstrategin skulle vara mer kostnadseffektiv vilket uppnåddes. I dagvattenstudien undersöktes också om rening sker i det underjordiska magasin som dagvattnet från halva kvarteret Brännugnen leds till. Resultatet visade att ingen rening sker i magasinet, då uppehållstiden är för kort för att partiklar ska hinna sedimentera. Förutom vatten från regn- och snösmältning kommer även kondensat och processvatten till dagvattennätet från kvarteret Brännugnen. Ett av målen i utredningen var att undersöka hur mycket kondensatet bidrar till den utsläppta mängden metaller. Provtagning av kondensat och dagvatten visade tillsammans med flödesberäkningar att kondensatet har en stor påverkan på hur stor mängd förorening som släpps ut per år. Riktvärden studerades också i denna dagvattenutredning, slutsatsen är att de riktvärden som Vattenfall förhåller sig till i dag är låga. Både schablonhalterna för värmeverk och vägdagvatten samt analysresultat av dagvatten från vägen utanför området överskrider Vattenfalls riktvärden för dagvatten. Slutligen skulle dagvattenstudien resultera i förslag på framtida åtgärder för rening av dagvattnet från kvarteret Brännugnen i form av tekniska lösningar. Avsättningsmagasin under mark och filteranläggning är två lösningar som är lämpliga för rening av dagvattnet med hänsyn till föroreningar och flöden. Kostnaden beror mycket på vilket flöde som blir dimensionerande. / Stormwater is rain and snow melt that runs off from hard surfaces. Stormwater is often polluted with heavy metals and organic pollutants, which can cause great damage if the water is not treated before it reaches the recipient. There are no national guidelines for threshold values of pollutants in stormwater. The stormwater group at Vattenfall AB Heat Uppsala and the environmental department at Uppsala municipality have together established threshold values for pollutants in the stormwater from the area Brännugnen, which is the name of the investigated area. Vattenfall has difficulties to keep the concentration of pollutants in the stormwater below the threshold values. To reduce the content of contaminants in the stormwater from the area Brännugnen this study was therefore carried out. Through site investigations and sampling of stormwater in six measuring points, sources of the contaminants were identified. Through literature studies, site investigations and discussions with experienced personnel, propositions of actions to avoid contamination of the stormwater have been developed. The stormwater study has also led to suggestion of an improved sampling strategy which better represents the amount of contaminants in the stormwater and is more cost-effective. The study included an investigation with the purpose to find out if the magazine that the stormwater from half of the area runs to have the capacity to reduce the contaminants. The results showed no reduction of contaminants. The reason is that the residence time is too short for the particles to have time to settle. In the study the contribution from condensate to the total amount of emitted metals in the stormwater was investigated. The condensate passes a treatment plant for purification before being discharged to the stormwater pipes. The result shows that the condensate has a large impact on the amount of emitted metals per year. Threshold values and standard values for stormwater was also studied, the conclusion is that the threshold values for the stormwater from the area Brännugnen are low. Both standard values for stormwater from thermal power stations and roads are higher than the threshold values. The results from the analyses of stormwater from the road outside the area Brännugnen also show higher concentrations of metals than the threshold values. Finally the stormwater study resulted in suggestions of technical solutions for future treatment of the stormwater from the area Brännugnen. An underground sedimentation magazine and a filter system are two treatment processes that can be used for removal of pollutants in the stormwater from the area Brännugnen.