Runoff Reduction Effect Research Articles

An analysis of storage and runoff reduction characteristics using planter box in architectural LID system

Recently, research about Low-Impact Development (LID) techniques has been expanded due to problems with the effects of climate change and urbanization that have been increasing. LID technology is used to control flood damage environmentally to reduce runoff and is reduce runoff on city also restore into previous water circulation system from present developed city. However, studies about quantitative data of LID techniques are insufficient. Therefore in this study, the Curve Number (CN) was calculated with the Planter Box, which is storage type LID technology to conduct the water circulation (infiltration, runoff, overflow) analysis. Rainfall intensity scenario (60.4 mm/hr, 83.1 mm/hr, 97.4 mm/hr, 108.2 mm/hr) about water circulation analysis of Planter Box is selected on the basis of probable rainfall intensity table. According to the experimental results, the storage rate of rainwater in Building Planter Box and Street Planter Box was 43.5% to 52.9% and 33.4% to 39%, respectively. In addition, CN value is estimated to 83 at the Planter box and the runoff reduction effect by applying Horton's infiltration capacity curve showed on 51% to 98%.

The effects of three micro-catchment practices on erosion and runoff dynamics for a typical soil slope on the Loess Plateau of China

Three micro-catchment measures that are named fish-scale pits (FSPs), artificial digging (AD), and contour plowing (CP) for soil erosion prevention are widely used in the Loess Plateau. To clarify the effectiveness of these measures in intercepting runoff and reducing erosion and the mechanism of water flow movement, intermittent simulated rainfall events was carried out in the 15° slopes with FSPs, AD, CP, and control slope (CK). The results demonstrated the following. (1) For cumulative rainfall <83 mm, three measures effectively intercepted runoff and reduced sediment compared with the CK. The runoff and sediment reduction effect of three measures gradually disappeared when cumulative rainfall increased to 83, 99, and 108 mm, and the sediment generation of the three measures successively exceeded that of the CK and was more than two times higher. (2) Laminar or transition flow occurred for the CK, and the flow pattern changed from subcritical to supercritical at 101 mm of cumulative rainfall. For three measures, the flow patterns became turbulent within a short time but remained subcritical. (3) A correlation analysis showed that the soil detachment rate, hydraulic shear stress, and stream power in the micro-catchment measures can be described using linear functions, which reduced the rill erodibility and enhanced the soil’s resistance to concentrated flow erosion. This research has important guiding significance on the rational and effective implementation of micro-catchment practices to prevent severe soil erosion and increase water storage for crop production on the Loess Plateau of China.

Analyzing the Impact of Impervious Area Disconnection on Urban Runoff Control Using an Analytical Probabilistic Model

The rapid spreading of impervious areas has been a growing concern in urban stormwater management. Runoff originating from impervious areas directly connected to or disconnected from drainage systems contributes differently to the outflow at the downstream outlet. Extensive implementations of best management practices (BMPs) and low impact development (LID) practices necessitate more accurate quantifications of the runoff control effects of disconnecting impervious areas from drainage networks. An analytical probabilistic model was developed in this study that considers the differences between directly-connected and disconnected impervious areas. The novel feature of this model is that it can not only explicitly consider the effect of impervious area disconnection but also analytically calculate the runoff reduction effects contributed by impervious area disconnection. Model validity is demonstrated by comparing its outcomes with the results of a series of continuous simulations for cases with different types of soils and various land use parameters in Jackson, Mississippi and Billings, Montana, USA. Example applications of the proposed analytical model also demonstrate its usefulness in the planning and design of impervious area disconnections.

亚热带季风区城市典型绿化屋顶的径流削减效应

PDF HTML阅读 XML下载 导出引用 引用提醒 亚热带季风区城市典型绿化屋顶的径流削减效应 DOI: 10.5846/stxb201808281837 作者: 作者单位: 南京工业大学,南京工业大学,南京工业大学,南京工业大学,南京工业大学 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（41871189，51408303）；江苏省自然科学基金（BK20140941，BK20161547） Assessing the rainwater runoff reduction effects of typical green roofs in a humid subtropical city Author: Affiliation: Nanjing Tech University,Nanjing Tech University,Nanjing Tech University,Nanjing Tech University,Nanjing Tech University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:屋顶绿化能够削减暴雨径流，降低城市内涝发生频率，促进可持续雨洪管理。针对亚热带季风气候区典型绿化屋顶的全年径流削减效应，以南京为研究区，以简易型、花园型两类绿化屋顶为研究对象，基于1年现场观测数据及水量平衡方程，分析屋顶雨水的滞蓄、蒸发与径流量随季节变化规律及其关键影响因子，采用SCS-CN模型计算绿化屋面的径流曲线数（CN），并估算城市尺度大面积屋顶绿化的暴雨径流削减效果。结果显示，简易型、花园型绿化屋顶全年径流削减率分别为42%和60.7%；径流削减效应的四季排序为春季 > 冬季 > 秋季 > 夏季，平均径流削减率依次为78.6%、47.5%、33.2%、32.9%（简易型）及98%、84.3%、49.5%、48.1%（花园型）；土壤基质层对雨水截留起主导作用，分别占径流削减总量的52%和62%；雨量和雨强是影响径流削减效应的关键因子，与径流削减率均呈显著负相关关系（P < 0.01），初始土壤湿度与简易型绿化屋顶的径流削减率呈显著负相关（0.01 < P < 0.05），但与花园型的径流削减率无显著相关性；基于全年77次降雨事件的降雨量-径流量数据测算得到简易型和花园型绿化屋顶的CN值分别为92和88；若南京主城区所有建筑屋顶面积的60%实施两类绿化，则其全年径流量可分别削减2.8×107 m3和4.2×107 m3。以上研究结果可为城市雨洪管理和海绵城市建设提供科学依据。 Abstract:Roof greening provides a promising solution to urban flooding because of the commonly assumed effect on rainwater runoff reduction; however, few studies have investigated this effect in humid subtropical areas using long-term monitoring data. In this study, we evaluated two typical types of green roofs, extensive and intensive, in Nanjing City for their capacity to reduce runoff based on empirical hydrological equations calibrated with field measurement data collected over a whole year circle. We analyzed the variations in rainwater retention, evaporation, and runoff with respect to season and rainfall types. Based on paired rainfall-runoff data of 77 events over the year, the curve numbers (CN) of the two green roofs were calculated, and the annual runoff reduction of the city-scale roof greening was assessed. The results showed that annual runoff reduction rates of the extensive and intensive green roofs were 42% and 60.7%, respectively. The runoff reduction magnitude was highest in spring, followed by winter, autumn, and summer, with respective average reduction rates of 78.6%, 47.5%, 33.2%, and 32.9% for the extensive green roof and 98%, 84.3%, 49.5%, and 48.1% for the intensive roof. Soil played a dominant role in rainwater retention, accounting for 52% and 62% of the total runoff reduction for the extensive and intensive green roofs, respectively. Precipitation and rainfall intensity were key factors affecting runoff effects, both being negatively correlated with the runoff reduction rate (P < 0.01). Antecedent soil moisture was negatively correlated with the runoff reduction rate for the extensive green roof (0.01 < P < 0.05) but showed no significant correlation for the intensive green roof. The CNs of the extensive and intensive green roofs were assessed to be 92 and 88, respectively, compared with the value of 98 for conventional impervious roofs. A hypothetical 60% coverage of extensive and intensive greening on all building roofs in the main city of Nanjing might lead to an annual runoff reduction of 2.8×107 m3 and 4.2×107 m3, respectively. These results can provide a scientific basis for urban stormwater management and sponge city construction. 参考文献 相似文献 引证文献

Hydrological Response to Precipitation and Human Activities-A Case Study in the Zuli River Basin, China.

Precipitation and human activities are two essential forcing dynamics that influence hydrological processes. Previous research has paid more attention to either climate and streamflow or vegetation cover and streamflow, but rarely do studies focus on the impact of climate and human activities on streamflow and sediment. To investigate those impacts, the Zuli River Basin (ZRB), a typical tributary basin of the Yellow River in China, was chosen to identify the impact of precipitation and human activities on runoff and sediment discharge. A double mass curve (DMC) analysis and test methods, including accumulated variance analysis, sequential cluster, Lee-Heghnian, and moving t-test methods, were utilized to determine the abrupt change points based on data from 1956 to 2015. Correlation formulas and multiple regression methods were used to calculate the runoff and sediment discharge reduction effects of soil conservation measures and to estimate the contribution rate of precipitation and soil conservation measures to runoff and sediment discharge. Our results show that the runoff reduction effect of soil conservation measures (45%) is greater than the sediment discharge reduction effect (32%). Soil conservation measures were the main factor controlling the 74.5% and 75.0% decrease in runoff and sediment discharge, respectively. Additionally, the contribution rate of vegetation measures was higher than that of engineering measures. This study provides scientific strategies for water resource management and soil conservation planning at catchment scale to face future hydrological variability.

Partition-coordinated control of soil and water loss for chestnut forests in the Yanshan Mountain Region, China

Soil erosion from chestnut forests is one of the most important factors causing land degradation in the Yanshan Mountain Region. A 2-year field study was done to compare the effects on erosion of a control plot (CP), a repaired and maintained horizontal ditch built with an engineering baffle every 6 m (MP 1), and a repaired and maintained horizontal ditch built with an engineering baffle every 8 m (MP 2). The results showed that the slope runoff of chestnut forests was influenced by rainfall characteristic factors. No single rainfall characteristic factor showed dominance for hill slope runoff. The runoff reduction effect of the partition-coordinated erosion control measures (MP 1 and MP 2) was substantial for chestnut forests under high rainfall intensity conditions. However, the runoff reduction efficiency was higher under the conditions of heavy rainfall and low average rainfall intensity than for storms with higher intensity and lower total rainfall. The reduction effect of the partition-coordinated erosion control measures on the runoff and sediment yield of chestnut forest slopes was MP 2 > MP 1 > CP. The runoff reduction rate and erosion reduction rate of MP 2 reached 61.70% and 97.41%, respectively, and that for MP 1 was 54.15% and 85.31%, respectively. Therefore, after a comprehensive comparison, MP 2 was determined to be more effective for soil erosion control for a sloping chestnut forest.

Modeling the Runoff Reduction Effect of Low Impact Development Installations in an Industrial Area, South Korea

Low-impact development (LID) methods are an important approach to storm-water mitigation. Modeling the effects of these installations using rainfall-runoff simulations can provide useful data for future design and implementation. In this study, we used the Storm Water Management Model to assess seven types of LID installations (vegetated areas, garden pots, tree filter boxes, permeable pavement, infiltration ditches, rain barrels, and infiltration blocks) at a South Korean industrial site. Using both short- and long-term simulation periods and distinct sub-basins within the study site, we were able to assess LID performance at the combined watershed, as well as at one LID facility. All LID types showed reasonable performance for storm-water runoff reduction, though rain barrels were the least effective. The effect of rainfall runoff reduction on LID facilities is changed according to rainfall depth (annual precipitation, monthly rainfall), the ratio of drainage area and facility capacity. We concluded that SWMM-LID modeling can effectively support the management of LID installations by providing additional design and planning data to better mitigate the effects of storm-water runoff.

Investigating the Influence of Various Stormwater Runoff Control Facilities on Runoff Control Efficiency in a Small Catchment Area

Urbanization causes an increase in the flood discharge because of the infiltration capacity. Furthermore, extreme precipitation events have been an increasing concern for many regions worldwide. This study aimed to investigate the influence of different outflow control facilities on runoff reduction in a small watershed. We focused on the soil-improvement technology and rainwater tanks as outflow control facilities and conducted a runoff calculation using a rainfall event of a magnitude that is likely to occur once in a hundred years. The calculation showed that the soil-improvement technology reduced runoff during long-term continuous rainfall, whereas in a concentrated short-term rainfall event, a significant difference in the runoff reduction effect between rainfall tanks of various volumes was observed. Since effective countermeasures for runoff reduction differ depending on the rainfall distribution pattern, we suggested both facilities for storing initial rainfall and initiating countermeasures for penetration improvement over the long term.

Research on the effect of rainfall flood regulation and control of wetland park based on SWMM model—a case study of wetland park in Yuanjia village, Qishan county, Shaanxi province

Taking the wetland park of Yuan Village in Qishan County of Shaanxi Province as the research object, this paper makes a reasonable generalization of the study area, and establishes two models of low impact development (LID) and traditional development in the park. Meantime, rainwater in the surrounding built up area is introduced to into the park for digestion. SWMM model is used to simulate the variation of the total runoff, peak flow and peak time of two development models in Wetland Park under one-hour rainfall at different recurrence periods.The runoff control effect in each single LID facility in the one-hour rainfall once during five years in the built-up area is simulated. The simulation results show that the SWMM model can not only quantify the runoff reduction effect of different LID facilities, but also provide theoretical basis and data support for the urban rainfall flood problem. LID facilities have effects on runoff reduction and peak delay. However, the combined LID facility has obvious advantages for the peak time delay and peak flow control. A single LID facility is more efficient in a single runoff volume control. The order of runoff reduction by various LID facilities is as follows: Rain garden>combined LID facility> vegetative swale> bio-retention cell > permeable pavement. The order of peak time delay effect by the LID facilities is as follows: combined LID facility> Rain garden> vegetative swale> bio-retention cell > permeable pavement. The order of peak flow reduction efficiency by various LID facilities is: combined LID facility> Rain garden> bio-retention cell > vegetative swale> permeable pavement.

Assessing the hydrological behaviour of large-scale potential green roofs retrofitting scenarios in Beijing

Although the study of hydrological performance of green roofs is of great significance to urban water security and sustainable development, large-scale roofs greening within a city range has not received sufficient attention. In this study, a typical urban area of 675 km2 within the fifth ring road of Beijing was chosen as a case study. The potential green roofs were defined before being identified from high resolution images. Under three retrofitting scenarios (100%, 50% and 20%) of extensive green roofs, the hydrological behaviour of potential green roofs was investigated at catchment units by employing the Soil Conservation Service Curve Number model. The behaviour was evaluated finally through two aspects of the runoff reduction effect and the flooding mitigation effect. According to this study, a 19.6% of the potential green roofs within the study area indicates a strong potential for the future greening. In the city scale, the average runoff reduction rates decrease from 9.38% to 6.13% with the increasing return period of rainfall events. Catchments in the core of northern city play key roles in reducing runoff, by more than 10% with the 100% implementation scenario. This study also showed that flooding in 13 of the 20 underpasses would have been avoided in the 7.21 Rainstorm if only 20% of the potential green roofs had been implemented. This study demonstrated a potentially positive hydrological behaviour contributed by roof greening in the future Beijing at a city scale, and effective runoff reduction can be achieved if only with a 50% greening of the potential green roofs. However, urban planners should take notice of the predicament that the deposit of high potential green roofs do not match spatially well to the severe flooding sites.

Pollutant reduction effectiveness of low-impact development drainage system in a campus

Building a rainwater system based on the idea of low-impact development (LID) is an important aspect of the current “sponge city” construction in China. The “sponge city” concept emphasizes that the runoff can permeate the soil or be stored temporarily, and rainwater could be used again when it is needed. Beijing is one of the earliest cities to study rainwater harvesting and LID techniques in China. Through long-term monitoring of rainfall, runoff flow, and water quality of a campus demonstration project in Beijing, the runoff quantity and pollutant concentration variations have been analyzed. Furthermore, the runoff reduction effects of single LID measure, such as green roof, filtration chamber, and permeable pavement, have been investigated. Additionally, the overall reduction effectiveness of the LID system on the average annual rainfall runoff and pollution load has been discussed. Preliminary studies suggest that runoff pollutant concentration is positively correlated with the rainfall interval time, and the longer rainfall interval time leads to higher runoff pollutant concentrations. The very good outflow quality of the rainwater harvesting system could satisfy the reclaimed water quality standard for scenic entertainment use. The non-point-source pollution reduction effects of the LID system are obvious because the pollutants could be removed by filtration on the one hand and the pollution load could be reduced because of the significantly reduced outflow on the other hand.

Vegetative Filter Strip (Vfs) Applications for Runoff and Pollution Management in the Saemangeum Area of Korea

AbstractThis study was conducted to develop a vegetative filter strip (VFS) technique to manage agricultural non‐point source (NPS) pollution in the region in Korea. The experimental plots were constructed with two different sizes and slopes in the uplands within the Saemangeum Basin. The soil type of the study area was classified as loam with NRCS hydrologic soil type B, and showed typical upland soil characteristics. The rainfall–runoff relationships and NPS pollution reduction effects of the VFS were assessed, and the total cost of VFS application was estimated. It was noted that runoff reduction effects ranged from 14.1 to 69.3%, and NPS pollution reduction effects were 9.8–94.2% in suspended solid (SS), 24.0–73.3% in total nitrogen (T‐N) and 47.6–80.9% in total phosphorus (T–P) from the VFS plots. The variations of VFS effects were caused by various factors including size and slope of the source area, cover ratio and width of VFS, as well as rainfall characteristics. The total VFS application cost was estimated to be approximately US$3390 ha−1 yr.−1, considering the costs for construction and maintenance of the VFS system and the loss of benefit caused by giving up crop cultivation in the area needed for VFS construction. Copyright © 2016 John Wiley &amp; Sons, Ltd.

Simulation of infiltration facilities using the SEEP/W model and quantification of flood runoff reduction effect by the decrease in CN.

In this study, four infiltration facilities (permeable pavement, infiltration gutter, infiltration trench, and infiltration well) have been investigated and compared with their flood runoff reduction effect. The SEEP/W model was used to estimate the infiltration amount of each facility, and the flood runoff reduction effect was quantified by the decrease in curve number (CN). As a result of this study, we found that: (1) the infiltration could be successfully simulated by the SEEP/W model, whose result could also be quantified effectively by the decrease in CN; (2) among the four infiltration facilities considered in this study, the infiltration well and infiltration trench were found to be most efficient and economical; (3) finally, the intervention effect of the nearby infiltration facility was found not so significant. In an extreme case where the infiltration wells were located at 1 m interval, the intervention effect was found to be just 1%.

저류형 옥상녹화의 우수유출저감에 대한 연구

저류형 옥상녹화의 우수유출저감에 대한 연구

Runoff Control Potential for Design Types of Low Impact Development in Small Developing Area Using XPSWMM

The increase in impervious area caused by development project has resulted in prone to water management with climate change, which can affect the water cycle, including the ecosystem. It has been pointed out as a major cause of water pollution according to nonpoint source runoff increases, as well as the cause of disasters such as floods and inundated with heavy rains. In particular, the increase in the impervious surface induces a rapid release of rainfall and brings an increase in the surface discharge by reducing the permeability of the area of the existing tree. LID techniques have been widely applied in order to recover water environment conditions prior to the development reducing the impervious area. The study on the optimum type, the number and placement of LID facilities suitable for area characteristics is being carried out, but the research for the actual design which is about the effect of runoff reduction from the combination of LID facility makes the difficulty of LID effect prediction. Consequently, this study analyzes runoff characteristics for the units and combination of LID facilities through real LID design practices, and identified the effect of runoff reduction and climate change responsiveness the for the combination of retention-Infiltration facilities as the rainfall scenario. The result was confirmed that a combination facilities has about 10% or more of the peak runoff reduction than the single one, observed more outstanding effect of runoff reduction in combination facilities higher the storage capacity of among combination facilities, particularly when the proportion of retention-Infiltration is 1:2 (1,000m3-500m2), it was possible to obtain up to 26% or more of the peak runoff reduced. When LID techniques are applied to areas similar to the present study, runoff reduction can be predictable based on the results from this research, above all the method and guidelines for optimum capacity selection of combination facilities of retention-Infiltration to achieve the targets of runoff reduction, which is used as a reference for LID design of future projects suitable for the condition and characteristics of target area.

漓江滨岸草带对径流泥沙的拦截效果

PDF HTML阅读 XML下载 导出引用 引用提醒 漓江滨岸草带对径流泥沙的拦截效果 DOI: 10.5846/stxb201409101783 作者: 作者单位: 北京林业大学,北京林业大学,北京林业大学,北京林业大学 作者简介: 通讯作者: 中图分类号: X171.1 基金项目: 国家“十二五”科技支撑计划项目（2012BAC16B03） Preliminary study of runoff reduction and sediment removal by grass strips in riparian zone, Li River Author: Affiliation: Beijing Forestry University,Beijing Forestry University,Beijing Forestry University,Beijing Forestry University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:位于污染源和受纳水体之间的滨岸带对径流泥沙的过滤作用已经得到广泛认可，滨岸植被的存在能降低径流流速，增加土壤入渗，延缓产流时间，促使径流中的悬浮物质得到沉积。而关于漓江滨岸草带过滤作用的相关定量研究和应用尚未见报道。为探索影响草带过滤效果的影响因素，在广西漓江滨岸带内按不同植被条件、不同带宽布设6个试验小区，通过小区放水试验测定滨岸草带对径流泥沙的拦截效果。结果表明：草带能有效拦截径流悬浮物，对径流、泥沙的拦截率分别达到66%和68%，当草带宽度增加到10m时拦截率均达90%。带宽是影响径流泥沙拦截的主导因素。植被条件是影响拦截效果的又一重要因素，而初始含水量和入流泥沙浓度对拦截效果的影响较小。同一草带对泥沙的拦截效果优于径流的拦截效果，且二者之间存在密切的线性关系。 Abstract:The impact of vegetation on pollutant removal from runoff in a riparian zone has been widely recognized. Vegetation on the riparian zone is believed to decrease water turbulence, increase water infiltration, prolong the runoff producing time and enhance the sediment deposition through it. However, to the best of our knowledge, no study has been conducted so far to assess the performance of grass strips grew in riparian zone of the Li River. In this study, six experimental plots with varying plantation modes and vegetation lengths were constructed in the riparian zone of Li river, Guangxi Zhuang Autonomous Region, which were used to determine the effect of runoff reduction and sediment removal by typical vegetation. The results of our study showed that grass strips could effectively intercept runoff and sediment. The average runoff and sediment trapping efficiency (TE) of all six plotted filters were 66% and 68%, respectively. The trapping efficiency reached 90% when the filter length was increased to 10 m. The results indicated that the length of the filter was the most crucial factor affecting sediment deposition. Vegetation type was another important factor, and was found to be more decisive than the initial water content and inflow sediment concentration. The sediment TE was higher than the runoff TE, and appeared a positively linear relationship with the runoff TE in one and the same vegetated filters. 参考文献 相似文献 引证文献

Analysing Green Roof Effects in an Urban Environment: A Case of Bangbae-dong, Seoul

Green roofs have been considered as an alternative to providing green spaces in urban areas. Recently, many researchers have suggested that green roofs could contribute to urban flood mitigation by reducing the amount of stormwater runoff. However, the stormwater runoff reduction effect has not yet been fully understood. In this study, two analyses have been performed to investigate the stormwater runoff reduction effect and economic feasibility of green roofs. First, as simulated using PCSWMM, the stormwater runoff effect of green roofs was identified and then the rooftop attributes were considered to acquire results that are more precise. As a result, two of three scenarios demonstrated an average 20% reduction of runoff, which is comparatively smaller than the results of preceding studies. Second, benefit-cost analysis was performed to evaluate the economic feasibility of green roofs. Two of the three scenarios had a benefit-cost ratio narrowly above 1.0 over a period of 20 years. Our results seem to suggest that a green roof has benefits that surpass costs; yet it is insufficient to say that it is an economically sound approach. Overall, green roof does have some stormwater runoff reduction effects and economic effects, but these were not as significant as has been previously described.

LID 적용면적별 우수유출 저감효과 분석

LID 적용면적별 우수유출 저감효과 분석

Investigation on the Purification Efficiency of Rainwater by Green Land

Rainwater utilization system using green technology, not only can reduce the pressure of rainstorm on the city drainage system, and replenish groundwater resources, but also control urban non-point source pollution. At present, rainwater indirect utilization is widely used. This research explored the Kunming urban green space system typical for each pollutant runoff reduction effect, purifying regularity and removal mechanism in order to provide a theoretical basis for its application.

Evaluation of Flood Runoff Reduction Effect of LID (Low Impact Development) based on the Decrease in CN: Case Studies from Gimcheon Pyeonghwa District, Korea

LID are spread on a small scale throughout target area, therefore, evaluation of their overall effect on flood reduction is not straightforward. As one solution dealing with this problem, Yoo et al. (2012) proposed a methodology for quantifying the flood runoff reduction effect of storage facilities by curve number (CN). Introduction of various infiltration or storage facilities causes the decrease in CN, which can be calculated using the runoff. The result derived was summarized in a graph showing the decrease in CN as an effect of the runoff reduction. That is, the runoff reduction effect of infiltration or storage facilities was able to be easily estimated using the derived graph. In this study, LID effects of Gimcheon Pyeonghwa district in Korea was quantified using this method. Additionally, the reduction amount of the runoff volume using the method suggested by Yoo et al. (2012) was compared with that estimated by using SWMM 5.0. As a result of this, the effect of LID facilities was shown similarly in both cases using the methodology used in this study and simulated using SWMM 5.0. This result verified that the methodology was valid even though it is straightforward and simple.