[required]
Sponge city is a new generation of urban rainwater and flood management concept. It refers to that the city has good "elasticity" in adapting to environmental changes and dealing with natural disasters brought by rainwater. It can also be called "water elastic city". The international term is "low impact development rainwater system construction". Water absorption, storage, seepage and purification in case of rain, and "release" and use the stored water when necessary. Its core is to keep the hydrological characteristics unchanged before and after site development, including total runoff, peak flow, peak time, etc. From the perspective of hydrological cycle, in order to maintain the total amount of runoff unchanged, it is necessary to adopt infiltration, storage and other methods to realize that a certain amount of runoff will not be discharged after development; To maintain the peak flow unchanged, measures such as infiltration, storage and regulation should be taken to reduce the peak and delay the peak time.
Six character policy: seepage, stagnation, storage, purification, utilization and drainage
[service content]
1. prepare special design description for sponge city and submit it to the competent planning department
2. Clarify the overall planning, feasibility study, construction objectives, strategies and paths of sponge City, and prepare the detailed planning or implementation scheme of sponge city construction according to the characteristics of the project and local conditions;
3. Assist in the study of policies and management methods, and prepare the design and construction guidelines, local standards and standard atlas of sponge city; And other requirements of the competent government departments for sponge city;
4. Special planning of sponge City, including overall planning of sponge City, comprehensive drainage and waterlogging prevention planning, blue line planning, water supply planning, green system planning, comprehensive traffic planning, flood control planning, etc.
[contents and achievements of stage work]
Special planning stage
According to the overall planning of the project area and the overall situation of the project, study and analyze the special index requirements of sponge city of the project, and issue the special research paper on special planning of sponge city;
Program phase
According to the technical measures and implementation strategies to be adopted in the project scheme stage, explain the overall situation of the project and the design technical measures of each discipline, and issue the special design scheme of sponge city;
Construction drawing design and review stage
(1) Use SWMM to establish lid model, conduct special simulation analysis, and issue sponge city simulation analysis report;
(2) According to the characteristics of the project, prepare the detailed planning and implementation scheme of sponge city construction according to local conditions, guide the relevant disciplines of the design unit to implement the technical measures of sponge city in the construction drawings, and issue the rainwater pipe network map, catchment zoning map and facility layout map;
(3) Prepare the application materials according to the special design of sponge City, and issue the sponge city facility construction objective form and the sponge city design scheme self-assessment form;
(4) Submit the data to the drawing review unit for review, communicate with relevant units in time, and confirm the implementation of the review opinions. The modified contents meet the review requirements, and the review qualified opinions issued by the drawing review organization;
Declaration and review stage: collect, sort out and archive the sponge City materials required by the data review of the Planning Bureau, be responsible for the declaration and review, submit the sponge city design report, ensure that it passes the review and obtains the qualified reply documents, and the sponge office issues the qualified opinions on the special review of sponge city.
[main measures of sponge city]
Concave green space
The greening of the ground and basement roof of the project adopts the concave green space design, and its greening elevation is 0.1 ~ 0.2m lower than that of the road. Rainwater can be effectively accumulated during rainfall. The concave green space is provided with an overflow port, and the rainwater that cannot be accumulated enters the rainwater pipe network of the site through the overflow port.
Ecological tree pond
The soil covering elevation of arbor planting in the project can be reduced to make it have rainwater storage capacity. The planting soil surface shall be provided with permeable cover plate to avoid soil loss caused by rainwater scouring.
Rain garden
The structure of rainwater garden is simple, which can generally ensure that the rainwater exceeding its design capacity can be discharged in time; The rainwater garden can flow out the excess rainwater around. Generally, there is no need for a special overflow device. When the location is not easy to directly discharge the excess rainwater, a simple overflow device can be set.
Curb at opening
If kerbs are required to be set on both sides of the green belt, the opening design shall be interrupted to ensure that the rainwater on the road can flow into the green belt by gravity.
[policies and regulations]
1. Guidance on promoting the construction of sponge city (GBF [2015] No. 75) issued by the general office of the State Council
2. Measures for performance evaluation and assessment of sponge city construction (Trial) issued by the Ministry of housing and urban rural development
3. Notice on carrying out the pilot work of central financial support for sponge city construction
4. Notice on carrying out the pilot work of central finance supporting the construction of sponge city in 2016 (CBJ [2016] No. 25)
5. National building standard design system for sponge city construction
6. Technical guide for sponge city construction - Construction of rainwater system for low impact development
7. technical code for comprehensive utilization of rainwater for low impact development
8. Technical indicators for low impact design of construction projects
9. Implementation opinions on promoting the construction of sponge city issued by the general office of Guangdong Provincial People's Government (YFB [2016] No. 53)
10. Implementation plan for promoting the construction of sponge city in Shenzhen deep sea Mianban [2016] No. 3
11. Zhuhai sponge City special plan (2015-2020)
12. Guidance documents of local cities on sponge city planning and design standards, specifications and review guidelines
