Stormwater Reduction Research Articles

Vicissitudes and prospects of green roof research: a two-decade systematic bibliometric review

Urban green roofs have emerged as an innovative nature-based solution for enhancing urban sustainability and resilience. Based on the Web of Science Core Collection database, the scholarly papers on green roofs published in the past two decades were analyzed quantitatively and visualized using bibliometric techniques. The study scope covered research countries, institutions, main journals, crucial authors, highly cited documents, hot topics, and research frontiers. The 3210 publications mined from the bibliographic database on green roofs have increased progressively in the study period, with a significantly faster pace in recent years. The research subjects changed gradually over time, extending into more disciplines and becoming decidedly multidisciplinary. The notable bibliometric features registered a pronounced spatial concentration of research outputs in a small number of countries, regions, research institutions, journals, and researchers, mainly associated with developed metropolises. The number of publications and citation impacts identified the world’s top ten researchers and journals. Well-defined clusters depicted by knowledge graphs indicated a diverse range in the number and strength of inter-node connections for countries, institutions, researchers, and research topics defined by keywords. The research scope focuses on quantifying benefits and costs and optimizing designs to maximize biodiversity, hydrologic, thermal, and energy benefits as urban sustainability and climate-adaptation solutions. Emerging research should enhance biodiversity through optimal plant selection, integrate green roofs with renewable energy systems for sustainability, apply computational tools to enhance designs, evaluate low-cost and locally relevant design options for developing cities, and quantify co-benefits like stormwater reduction and energy savings. Multidisciplinary efforts leveraging simulations, ecosystem services valuation, and participatory community partnerships can advance context-appropriate green roof innovation and evidence-based policymaking to expand adoption in cities worldwide. Quantifying and communicating co-benefits are critical measures to drive wider implementation.

Evaluating the stormwater reduction of a green roof under different rainfall events and antecedent water contents with a modified hydrological model

This study simplifies the recession process, includes the hourly evapotranspiration, and modifies the surface layer of the green-roof hydrological model based on the Green-Ampt (G-A) method and Curve Number (CN) method. The existing G-A and CN methods are usually applied for event-total runoff. The results show that the proposed model improves the predicting accuracy of the outflow, and the model performs well for rainfall events with different intensities, duration, and hyetograph. the CN method performs as prominent as the G-A method but is more efficient. Based on observation, the retained volume and peak reduction are close to 50 % on average with a 1-to-2-hour peak delay. The results of the three-year simulation show that the retained volume and peak reduction reach 50 % for 75 % of the events when the antecedent water content is 30 %. Almost all rainfall is retained for events with rainfall amounts smaller than 20 mm when the antecedent water content is smaller than 30 %. On the other hand, 50 % (60 %) rainfall (peak) is retained (reduced) for events larger than 20 mm when the antecedent water content is smaller than 20 %. With the model verified using various rainfall events, the study generalizes an equation to estimate the rainwater retained by green roofs. Moreover, the stormwater-detention performance of a green roof in general is concluded quantitatively under different antecedent water content to assist the decision-making of irrigation concerning the goal of stormwater detention.

Retraction notice to “Evaluating the stormwater reduction of a green roof under different rainfall events and antecedent water contents with a modified hydrological model” [Resour., Environ. Sustain. 13 (2023) 100125

Retraction notice to “Evaluating the stormwater reduction of a green roof under different rainfall events and antecedent water contents with a modified hydrological model” [Resour., Environ. Sustain. 13 (2023) 100125

RETRACTED: Evaluating the stormwater reduction of a green roof under different rainfall events and antecedent water contents with a modified hydrological model

RETRACTED: Evaluating the stormwater reduction of a green roof under different rainfall events and antecedent water contents with a modified hydrological model

Understanding the relationship between Urban Heat Island and Urban Vegetation by reviewing three decades of satellite images for the Chennai Metropolitan Area

Urbanization has led to one of the most important climatic issues i.e., the Urban Heat Island (UHI) phenomenon. In Chennai Metropolitan Area (CMA), the overall distribution of the green cover has gradually succumbed to urbanization whereas the temperatures have soared by 1.3 deg C in the past six decades. Urban vegetation provides shade and protects the buildings from direct solar exposure, thus reduces the UHI. Further, it also sequester large quantities of carbon, reduce storm water runoff and function as noise filters and pollutant traps. In comparison with the international UHI studies, the studies concerning Indian UHI are limited. Hence, the aim of the current research work is to understand the seasonal relationship between Land Surface Temperature (LST) and the Normalised Difference Vegetation Index (NDVI) of CMA using LANDSAT 4, 5, 7 and 8 images captured during the years 1988, 1991, 1996, 2000, 2008, 2013 and 2016. The results are discussed under three parts namely, Part-A, Part-B, and Part-C. Part-A results infer that the CMA is covered predominantly by minimum LST values (9 deg C to 25 deg C) and maximum LST values (25 deg C to 50 deg C) during Monsoon and Summer/Post-Monsoon seasons, respectively. The mean LST of the CMA is between 18 deg C to 31 deg C throughout the year. In Part B analysis results, the study establishes a moderate seasonal correlation between LST and the NDVI values (r-values between -0.2648 and 0.3604). According to Part C results, ‘High Vegetation’ (NDVI values 0.5 to 1) has a significant role in maintaining the average LST during all four seasons. Further, it also has the potential to reduce the LST values during the summer season in CMA. However, due to a moderate correlation, the urban vegetation may reduce the LST value only as an outcome of reducing the rest of the UHI contributors.

Numerical solution of the Richards equation in unsaturated soil using the meshless Petrov–Galerkin method

Nowadays, infiltration tactics are widely used to manage storm water in urban areas. These techniques are used and recognized around the world due to their benefits, such as reducing the negative consequences of urbanization, reducing storm water flow in sewage systems and recharging groundwater. Richards equation is one of the most well-known equations for simulating water infiltration in soil in the unsaturated area. In the present study, a one-dimensional approach to the numerical solution of Richards equation is presented using meshless Petrov–Galerkin method and Kirchhoff transformation. The results of this modeling have been compared with analytical solution, laboratory data, and finite difference and meshless numerical methods. Given that the proposed model can provide an accurate representation of water level changes in unsaturated soil compared to analytical solution, laboratory data, finite difference method and MQ-RBF with the root mean square error equal to 0.09, 1.02, 0.7 and 0.1, it can be claimed that the model can model the flow of water infiltration in unsaturated soil.

Community Scale Assessment of the Effectiveness of Designed Discharge Routes from Building Roofs for Stormwater Reduction

Urban flooding is increasing due to climate change and the expansion of impervious land surfaces. Green roofs have recently been identified as effective solutions for mitigating urban stormwater. However, discharge routes that involve receiving catchments of stormwater runoff from roofs to mitigate high flows have been limited. Thus, a hydrological model was constructed to investigate the effects of changing discharge routes on stormwater flow. Three hypothetical scenarios were assessed using various combinations of discharge routes and roof types. The reduction effects on outflow and overflow were identified and evaluated across six return periods of designed rainstorms in the Tai Hung Tulip House community in Beijing. The results showed that green roofs, together with the discharge routes connecting to pervious catchments, were effective in reducing peak flow (13.9–17.3%), outflow volume (16.3–27.3%), drainage overflow frequency, and flood duration. Although mitigation can be improved by considering discharge routes, it is limited compared to that achieved by the effects of green roofs. However, integrating green roofs and discharge routes can improve community resilience to rainstorms with longer return periods. These results provide useful information for effective design of future stormwater mitigation and management strategies in small-scale urban areas.

Influence of Rainfall and Tree Traits on Stem Flow Production of Selected Urban Tropical Trees

Stem flow is small but important fraction of intercepted precipitation channeled through a tree canopy to the base of the trunk. Given increased impervious covers in cities, quantification of stem flow is necessary for a holistic understanding of hydrology in urban ecosystems. The values of urban treesare increasingly being recognized over the decades and authorities have invested in urban green infrastructure including urban forestry. However, knowledge related to rainfall redistribution by urban trees and reduce storm water are yet to be discovered for topical tree species. Therefore, this study aimed study the effect of canopy traits on stem flow percent and funneling ratios for isolated urban trees in a tropical wet climate. The stem flow of 21 individual trees (7 species with 3 replicates) located in University of Sri Jayewardenepura, Sri Lanka were measured from August 2019 to November 2019 by installing SF collars at diameter at breast height (dbh). The stem flow was measured for 20 individual storm events started with dry canopy condition. Gross precipitation was recorded using an automated weather station located in an open area in University premises. All trees produced stemflow for storm events larger than 4 mm. Felicium decipiens generated the highest stem flow and Pterocarpus marsupium Roxburgh generated the lowest among studied species. While F. decipiens showing negative correlation between rainfall and stem flow others showed positive correlation. In all species, crown volume, dbh and bark thickness showed negative relationship with stem flow. However, individual-tree stem flow percent and funneling ratio values were variable, even for similar rain depths, suggesting that meteorological factors play a role. Our findings highlight the need of careful species selection for urban forestry and importance of infiltration capacity at the base of urban trees when integrating storm water management with vegetation and soils in cities.
 Keywords: Stem flow percent, Funneling ratio, Urban hydrology, Urban forestry, Storm water management

Urban Green Spaces For Promoting Healthy Living And Wellbeing: Prospects For Housing

Urban Green spaces in cities protect the environment by reducing urban heat stress, reducing global warming potential gases, and reducing storm water runoff. The high rate of urbanisation, which has resulted in encroachment, use change, and other factors that have a negative impact on healthy living and wellbeing. The main objectives of this research are to study and select different typology for the study of urban green spaces and also analyse the major link between the urban green spaces which are impacting the healthy living of housing typology. We used peer-reviewed approaches, which included searching the Web of Science, Scopus Index, and PubMed databases for literature research, and then reviewing peer-reviewed publications. The findings imply that urban green spaces are important for city dwellers. Because it ties greater and more regular usage of green space to healthy living, good quality green space, and well-being, the study has social consequences.

Innovative Techniques and Methods used for an Improvement in Energy Saving in HM World City Bangalore

The design of buildings Using advanced designs and construction techniques that reduces heating, cooling, lighting, energy consumption with energy saving devices. The behavior adjustments that have the highest potential for utility energy savings. It can save carbon emission and changing climatic conditions. Day lighting - Natural light is one of the factors within a building as much as possible. Introduction of skylight with passive solar design. Orientation of the building is to be designed to achieve impact from south side ultraviolet rays. Natural air flow- Doors, windows, ventilators are the components of a building which reduces the air conditioning and heating equipments. Landscape – Planting trees and vegetation or installing sun filters on the openings to reduce radiant heat. Vegetative roofing systems can keep water out of a building, reduce storm water run-off, reduce stress on urban sewer systems and decrease run-off related pollution in waterways Waste management, Energy management, Environmental Management, Water management these systems are helps to enhance energy saving techniques. STP - Sewage treatment plant to be provided to convert recycled water to soft landscaped area. Even this water can be converted after softening plant into use of flushing tanks in WC Replacing florescent lamp to LED bulbs to produce same light and can have longer times and plentiful lighting. Dry and wet waste is segregated at source. In dry waste recyclable and non recyclable are also separated at source. Rain water harvest management is made compulsory by local and legal authorities. The paper thus deals with the various energy saving concepts which can be incorporated at the time of planning, designing, landscaping. Construction and execution stage to have energy efficiency in buildings

Analyzing the impact of hydrological storage and connected impervious area on the performance of distributed kerbside infiltration systems in an urban catchment

The popularity of subsurface distributed storage-based kerbside stormwater infiltration systems is increasing because they can be integrated within the strict spatial constraints of existing infrastructure. Distributed systems operate based on the concept of spreading a limited amount of storage throughout the catchment area to achieve runoff management objectives. Storage can also limit the performance of urban stormwater systems. This study investigated the role of storage capacity, especially the volumetric capacity and the emptying time, in the performance of kerbside leaky well systems in a residential catchment area with a native clay soil environment. A detailed, process-based deterministic hydrological model was used to analyze hydrologic storage via a continuous simulation approach. The model was calibrated against catchment outflows measured with stormwater infiltration devices. Individual kerbside infiltration systems were also calibrated to monitor the behavior of on-site kerbside infiltration systems. By using approach of continuous simulations during designed scenarios, this study considered the prestorm storage availability in the hydrological analysis. The results demonstrated that hydrologic storage greatly influences the performance of kerbside leaky well systems during higher-intensity storms. In addition, the results show that distributing a stormwater storage volume equal to thirty-five 1-kL rainwater tanks across the catchment area as a kerbside infiltration system could notably reduce the runoff flow rates and volumes. The results further highlight that the addition of more homes within the connected area could diminish the stormwater reduction benefits achieved through the installation of a distributed kerbside infiltration system.

A novel spatial optimization approach for the cost-effectiveness improvement of LID practices based on SWMM-FTC

Due to the increasingly frequent occurrence of urban waterlogging, the spatial optimization of low impact development (LID) practices has been commonly used to detain and reduce storm water runoff in the most cost-effective way. In this study, the flow transmission chain (FTC) was proposed to replace the routing portion of the Storm Water Management Model (SWMM) and was combined with the runoff component of the SWMM to simulate LID practices (SWMM-FTC). In the SWMM-FTC, the third Evolution Step of Generalized Differential Evolution (GDE3) was employed to optimize the LID layout design. The results showed that the relative error between the modified SWMM-FTC and the calibrated SWMM was less than 0.25% under various LID scenarios, and the computational efficiency of the SWMM-FTC was improved by 19.3 times. Moreover, the GDE3 outperformed the commonly used non-dominated sorting genetic algorithm (NSGA-II), the strength Pareto evolutionary algorithm (SPEA2), and the multi-objective shuffled frog leaping algorithm (MOSFLA) due to its ability to find the most cost-effective solution. The LID layout obtained from the SWMM-FTC with the GDE3 saved $210–1067 to achieve a 1% reduction in storm water runoff. This result demonstrates that the SWMM-FTC with the GDE3 can achieve higher environmental benefits than comparable models, providing better guidance for managers and stakeholders.

AN ANALYSIS ON THE EFFICIENCY OF GREEN ROOF IN MANAGING URBAN STORMWATER RUNOFF

Modernization has created new impervious urban landscape contributed to major catastrophe. Urban drainage system incapable to convey the excess rainwater resulting in flash flood due to heavy rainfall. The combination of green roof on building have tremendously proved to control stormwater efficiently. This study is conducted to review the efficiency of intensive and extensive green roof in reducing urban storm water runoff. This study identifies characteristic of green roof that contributes to lessening urban storm water runoff. Data was collected based on rigorous literature reviews and analyzed using meta-analysis. Overall, findings revealed intensive green roof performed better in reducing storm water runoff compared to extensive green roof. Green roof performance increases as the depth of substrate increased. Origanum and Sedum plants are both highly effective for intensive and extensive green roofs. The performance of green roof reduces as degree of roof slope increased.

Rain garden infiltration rate modeling using gradient boosting machine and deep learning techniques.

Rain garden is effective in reducing storm water runoff, whose efficiency depends upon several parameters such as soil type, vegetation and meteorological factors. Evaluation of rain gardens has been done by various researchers. However, knowledge for sound design of rain gardens is still very limited, particularly the accurate modeling of infiltration rate and how much it differs from infiltration of natural ground surface. The present study uses experimentally observed infiltration rate of rain gardens with different types of vegetation (grass, candytuft, marigold and daisy with different plant densities) and flow conditions. After that, modeling has been done by the popular infiltration model i.e. Philip's model (which is valid for natural ground surface) and soft computing tools viz. Gradient Boosting Machine (GBM) and Deep Learning (DL). Results suggest a promising performance (in terms of CC, RMSE, MAE, MSE and NSE) by GBM and DL in comparison to the relation proposed by Philip's model (1957). Most of the values predicted by both GBM and DL are within scatter limits of ±5%, whereas the values by Philips model are within the range of ±25% error lines and even outside. GBM performs better than DL as the values of the correlation coefficients and Nash-Sutcliffe model efficiency (NSE) coefficient are the highest and the root mean square error is the lowest. The results of the study will be useful in selection of plant type and its density in the rain garden of the urban area.

Performance of pervious concrete under shear and bearing strengths

Pervious concrete is one of the materials with potential applications in the construction industry because it can help reduce environmental problems caused by conventional concrete, improve storm water management, and provide a low-impact development alternative. Pervious concrete has numerous advantages, including assisting with water filtering and lowering pollutants. The ability to reduce storm water runoff is the most important feature that attracts the attention of pervious concrete. The objective of the present investigation is to evaluate the properties of pervious concrete and compare them with normal concrete. On the other hand, the requirement for aggregate to produce concrete is high, while natural resources are reduced. An attempt was made to use Black Marble Stone Waste Aggregate in concrete by replacing natural aggregate at a ratio of 0, 50, and 100%.To obtain the behavior of pervious concrete, compressive, shear and bearing strength are evaluated. A total of 54 specimens were casted and tested in this experimental work to study the behavior of concrete. To assess the shear and bearing strengths, a regression model was developed.

Effect of various combinations of aperture diameter and pattern on concrete paver block

In the heavy Rainfall areas water – logging on roads is the main cause for the early damage of roads, which requires frequent maintenance. In the permeable concrete block pavement (PCBP), through joints water is percolated with that reducing storm water runoff, urban heat island effects, and increasing groundwater recharge. To increase the rate of infiltration in PCBPs, concrete paver block (CPB) with an aperture was developed. To study the effect of aperture, an experimental program was conducted on CPBs with different combinations of aperture diameter and pattern, by keeping aperture area as constant. These blocks were tested for compressive strength, split tensile strength and water absorption. In CPBs, for different combinations of aperture diameter and pattern, there was no significant change in compressive strength and water absorption values. Split tensile strength of CPBs was impacted adversely with increase in the number of apertures, to improve this property appropriate aperture pattern should be adopted.

АРХІТЕКТУРНО-МІСТОБУДІВНІ ТА СОЦІАЛЬНО-ЕКОНОМІЧНІ ПЕРЕДУМОВИ ФОРМУВАННЯ ЗЕЛЕНОЇ ІНФРАСТРУКТУРИ

In the article the relevance of this research is due to overcoming the complex of social, environmental and economic problems in urban planning related to environmental improvement, improvement, greening of cities and settlements. Being one of the main elements of urban planning, "green spaces" form a favorable ecological environment. They also help to combat the effect of "thermal islands" by participating in the process of evaporation of moisture; reduce storm water runoff; improve air quality by absorbing atmospheric pollution. Improvement of cities is one of the priority tasks of forming a comfortable urban environment. It includes: improvement of the ecological situation in cities (related to the improvement of the landscaping system, which means scientifically grounded spatial arrangement of all components of urban landscaping according to urban areas) soil, climatic and other factors in order to achieve optimal ecological, sanitary and sanitary and sanitary effects. In the foreign practice of urban planning use the concept of "green infrastructure" ("Green infrastructure") or blue-green infrastructure ("Blue - green infrastructure"), which focuses on the environmental importance of the territory. Which considers the whole spectrum of landscape changes and serves as a basis for the formation and development of a favorable state in cities. The main reason for the interest in green infrastructure in the world is the desire to make the city a more conducive place to live, as well as to climate change. Reducing the negative impact on the environment is the key to the socio-economic development of the country. The purpose of this work is to develop recommendations for the design of green infrastructure. Analysis of existing experience in designing and implementing green infrastructure in an urbanized environment, identifying trends in the further development of their architectural and urban planning structure. The object of the study is the green infrastructure of major cities in the world, including its architectural and urban planning and spatial solutions in the city structure. The article presents typical landscaping schemes and their classification, as well as methods of using green spaces to improve the environmental, social and aesthetic status of cities.

Co-designed Land-use Scenarios and their Implications for Storm Runoff and Streamflow in New England.

Landscape and climate changes have the potential to create or exacerbate problems with stormwater management, high flows, and flooding. In New England, four plausible land-use scenarios were co-developed with stakeholders to give insight to the effects on ecosystem services of different trajectories of socio-economic connectedness and natural resource innovation. With respect to water, the service of greatest interest to New England stakeholders is the reduction of stormwater and flooding. To assess the effects of these land-use scenarios, we applied the Soil and Water Assessment Tool to two watersheds under two climates. Differences in land use had minimal effects on the water balance but did affect high flows and the contribution of storm runoff to streamflow. For most scenarios, the effect on high flows was small. For one scenario-envisioned to have global socio-economic connectedness and low levels of natural resource innovation-growth in impervious areas increased the annual maximum daily flow by 10%, similar to the 5-15% increase attributable to climate change. Under modest population growth, land-use decisions have little effect on storm runoff and high flows; however, for the two scenarios characterized by global socio-economic connectedness, differences in choices regarding land use and impervious area have a large impact on the potential for flooding. Results also indicate a potential interaction between climate and land use with a shift to more high flows resulting from heavy rains than from snowmelt. These results can help inform land use and development, especially when combined with assessments of effects on other ecosystem services.

A spatial life cycle cost assessment of stormwater management systems

Although widely implemented, the research and understanding of the economic impacts and benefits of green infrastructure (GI) systems remain limited. Currently, few studies have investigated the economics of GI systems from a spatial perspective and typically opportunity costs related to land and property tax were ignored. This study aims at bridging these gaps by investigating both the equivalent annual costs (EAC) and cost effectiveness of seven GI systems and compare them against local wastewater treatment facilities in five different US cities. To do this, we utilized capital and maintenance cost data obtained from GI systems that are currently installed at the University of New Hampshire. The costing data were then extrapolated across five different cities considering reported local material, land, tax, and labor rates. A system dynamics model was utilized to calculate the total stormwater reduction as well as the amounts of nitrogen and phosphorous removed by each GI system over its life cycle under a certain city setting. Based upon these outcomes, the cost effectiveness (CE) in terms of stormwater reduction, nitrogen treatment, and phosphorous treatment of the GI systems was calculated. Land and tax costs were found to be a significant component of the EAC for GI systems with larger footprints in cities with higher property values, accounting for up to 78% in some cities. The rankings of the GI systems differ significantly when different types of cost effectiveness are under consideration. The tree filter performs the best when the CE is calculated based on stormwater reductions, while the subsurface gravel wetland performs the best considering nitrogen treatment, and either the subsurface gravel wetland or the sand filter performs the best considering phosphorous treatment. Our study suggests recommendations of GI systems need to be made based on local needs and issues to achieve the most cost-effective solution.

Optimizing Green Infrastructure Implementation with a Land Parcel-Based Credit Trading Approach on Different Spatial Scales

Implementing green infrastructure (GI) to reach certain stormwater reduction goal may be a challenging task for some land parcels (LP) in urban areas due to their unfavorable landuse conditions. In this paper, we proposed a capacity/credit trading (CT) method that allows city LPs with favorable landuse conditions to build more GIs than required and trade their extra capacity as monetary credit to LPs with building difficulties; this will allow the whole city area to achieve general stormwater mitigation goal in a more cost effective way. We investigated the effects of CT on cost reduction and (re)distribution of GIs among LPs over different trading scales, and an optimization model was constructed on the basis of different zoning of CT. The model was applied to determine GI distributions among individual LPs in order to minimize the overall cost. With a case study, we demonstrated that, without CT, requiring individual LPs to meet the mitigation goal on their own can be costly, and the cost grows with implementation pressure from storm runoff reduction; engaging CT for GI implementation reduced the cost significantly even at a small trading scale. Our analysis showed that, cost increment for GI implementation can be cut in half by performing CT at a spatial scale of 500–600 m that includes 5–6 LPs; when the CT trading zone is expanded to 1200 m that include 17 LPs, the cost increment can be cut by 3/4. The benefit of CT is obtained by re-distributing GIs among different LPs; but the spatial scale of CT needs to be limited to preserve the virtue of onsite treatment of stormwater with GIs. The proposed approach can be used to take advantage of the city landuse diversities to lower the overall cost of GI implementation for stormwater management.