Study Of Stormwater Management Measure Planning In Campus Base On SUSTAIN Model

With sharply decline area of forests, fields and wetland lakes caused by continuous urbanization,which can reduced storm-water runoff. Previous drainage system has been unable to meet the requirements of the current urban storm-water runoff’which result in frequent water-logging in city during rainy season. In addition to beautify environment under such circumstance, urban green space need to solve the problem of urban storm-water runoff. As an important part of urban green space, campus green space also facing campus water-logging problems in spite of difference between campus and urban in terms of user,function meet and use frequency. It is very important to scientific and effective planning of storm-water management measures in campus green space This study summarized some relevant theories about the storm-water management in domestic and foreign, such as measures and design method combining with the landscape architecture field. Using the SUATAIN model, which was developed by USEPA, combined with examples to carry out the planning of storm flood management measures,then give stormwater management planning advice.First,summarize the theory of storm-water management and engineering cases to analyze the experience which can reference to our national storm-water planning measure.At the same time, the study analyze existing problem of storm-water management at present research condition. Furthermore,drawing the landscape layout and design combined with storm-water management measure according to characteristics of campus green space.Second, xiaan campus of Fujian Agriculture and Forestry University was choosed as research base. After investigation and analysis of present situation and problems, we put forward a way to solve the problem of storm-water management measures with the aid of a powerful SUSTAIN model carrying on ArcGIS analysis module in xiaan campus.Furthermore,the study analyzed the suitability of layout, select the appropriate area which suit for construction of storm-water management measures.Third,on the basis of analysis and investigation at location, we finally determined the BMP in study area planning scheme, LID planning scheme and LID-BMP joint strategic planning scheme. Simulate model using every three hours of daily rainfall in 2015 as input data.The results showed a substantial increase after simulation compared to un-development scene which increased by 85-160% of the annual runoff. After performing the storm-water management measures at north subset watershed, the total annual runoff, peak runoff of Suspended Solids, the total annual average load load, Suspended Solids concentration was cut 55.5%,34.4%,58.6% and 4.7%, respectively.After performing the storm-water management measures at west watershed and the eastern subset watershed,the total amount of runoff, peak runoff of Suspended Solids, the total annual average load, Suspended Solids load concentration was cut 7.6% to 47.9%,13.7% to 56.1%,40.3% and 65.3%,40.3% to 59.5% and 7.9% to 68.5%,8.5% to 62.2%,40% to 76%.11.4% to 56.5%,respectively.Among those.the LID-BMP combined strategy scenario effects on the various control indicators are better than single BMP planning scheme or single LID measures planning scheme.Fourth,West watershed and east subset watershed was enventually optimize the cost of cost-effective of project investment at final optimization selection which cost 9.62 and 8.82 million yuan respectively.East subset watershed, the statistic of the 2015 annual rainfall data a total of 181 effective rainfall, including eight rainfall more than 30 mm, total rainfall of 489 mm, accounted for 26.3% of annual rainfall, annual total runoff control in 95%, reduction of the total annual flow rate at 73.7%, this study selected the most cost-benefit plan of annual runoff reduction rate at about 74%, conform to the design of fuzhou area rainfall is 30 to 40 mm, control 85% of the total annual runoff requirements. West watershed, the statistic of the 2015 annual rainfall data a total of 181 effective rainfall, of which 22 rainfall of more than 20 mm, the total rainfall of 837 mm, accounted for 45.1% of annual rainfall, annual total runoff control in 87.8%, reduction of the total annual flow rate at 64.9%; There are 27 rain for more than 15 mm, total rainfall of 943 mm, accounted for 50.8% of annual rainfall, annual total runoff control in 85.0%, reduction of the total annual flow rate at 49.1%. This study selected the most cost-benefit plan of annual runoff reduction rate at about 55%, it can control the design of the rainfall between 15 to 20 mm, total annual runoff control between 85.0 and 87.8%.Total annual runoff control can reach the standard of 85%, because of the difference between the control year design rainfall for 15 to 20 mm than sponge guide of urban construction requirements of 30 to 40 mm.