To respond to climate change and ensure the effect of existing flood control facilities, the central authority-in-charge may make a public announcement of implementation scope of the specific river basins or catchment areas of regional drainage for runoff allocation depending on the flooding potential, the degree of urban development and major constructions. The authority-in-charge shall draw up a runoff allocation plan within the given deadline and report to the central authority-in-charge for approval and public announcement before implementation.
If the specific river basins or catchment areas of regional drainage referred to in the preceding paragraph are adjacent, the authority-in-charge may integrate them into one runoff allocation plan. If the specific river basins or catchment areas of regional drainage are under the jurisdictions of different authorities-in-charge, the authority-in-charge of the runoff allocation plan shall be designated by the central authority-in-charge.
The authority-in-charge of each level shall establish a runoff allocation review committee to formulate and review the runoff allocation plan referred to in Paragraph 1.
Regulations governing the public announcement of the specific river basins or catchment areas of regional drainage, the deadline, principles, formulation, review, and approval and public announcement of the runoff allocation plan and the organization of the runoff allocation review committee as well as other related matters shall be stipulated by the central authority-in-charge.

The runoff allocation plan shall specific the following particulars:
1.Scope of the plan.
2.Overview of the plan.
3.Objectives of the plan.
4.Runoff allocation measures and the executive agency.
5.Budget and schedule.
6.Other related matters.
Runoff allocation measures referred to in Subparagraph 4 of the preceding paragraph refer to construction or controls required to achieve the objectives of the runoff allocation plan.

To formulate the runoff allocation plan, the authority-in-charge shall invite the authorities-in-charge of farmland drainage, soil and water conservation, forests, sewers, urban planning, land administration or related business, the municipal or city (county) governments, scholars, experts or organizations to seek advice through holding seminars or in other appropriate ways as a reference.
The runoff allocation plan covering indigenous people’s land or tribes and surrounding public land within a certain range shall be governed by Article 21 of the Indigenous Peoples Basic Law.
After formulating the runoff allocation plan, the central authority-in-charge shall exhibit it in public for 30 days and organize a public hearing; the date and location of the public exhibition and public hearing shall be published in the government gazette or newspapers, online or in other appropriate ways. Individuals or organizations may give opinions in writing to the central authority-in-charge with their names and addresses specified during the public exhibition; when reporting the runoff allocation plan to the central authority-in-charge for review, the authority-in-charge shall state their responses to the aforementioned opinions for reference.

When developing the relevant industry, the executive agency shall apply the runoff allocation measures based on the runoff allocation plan prior to the land reserved for watercourses, drainage or public facilities or public land.
When the land referred to in the preceding paragraph is unavailable, private land may be expropriated in accordance with the Land Expropriation Act.

If one of the following circumstances occurs after the runoff allocation plan is implemented, the authority-in-charge may review and modify it as required:
1.Significant changes in hydrological conditions or topography or damage to public facilities due to natural disasters or other major events.
2.A major public facility or utility plan developed by the government.
3.The formulation or modification of the national spatial plan, regional plan or urban plan.
The procedures for modifying the runoff allocation plan referred to in the preceding paragraph shall be governed by the procedures prescribed in Articles 83-2 and 83-4.

When runoff increases due to the land development and utilization at a certain scale or above, the obligator shall apply to the central authority-in-charge of relevant industry with the outflow control plan presented; then, the central authority-in-charge of relevant industry will forward the application to the municipal or city (county) authority-in-charge which the land is under the jurisdiction of for approval.
The obligator referred to in the preceding paragraph refers to the developer, operator, user or owner of the land.
If the land development and utilization referred to in Paragraph 1 is under the jurisdiction of a central agency, the outflow control plan shall be approved by the central authority-in-charge.
Before the outflow control plan is approved, an authority-in-charge of relevant industry shall not issue the permit to develop and use the land referred to in Paragraph 1 without permission.
After the outflow control plan is approved, the obligator shall construct, use, manage and maintain the land based on the approved plan; after completion, the obligator shall check regularly and keep records of the checks and submit the records to the municipal or city (county) authority-in-charge for review; the municipal or city (county) authority-in-charge may supervise and audit the construction, use, management and maintenance of the outflow control facilities.
In case of a certain degree of differences between the actual construction, use, management and maintenance of outflow control facilities and the approved outflow control plan due to any changes in land development and utilization or natural factors, the obligator shall apply for the change in the outflow control plan according to the procedures prescribed in Paragraph 1.
The outflow control plan shall include the following particulars:
1. Overview of land development and utilization.
2. Survey of the base status.
3. A peak discharge reduction scheme.
4. A construction plan and a use, management and maintenance plan.
5. Other related documents.
If the particulars referred to in the preceding paragraph have been implemented according to the outflow control proposal approved in accordance with Article 83-8 without any changes, they may be exempt from review.
Regulations governing a certain scale of land development and utilization, the submission, review, approval, records of checks and supervision and audit of the outflow control plan and a certain degree of differences between the outflow control facilities and the approved plan as well as the changes in the outflow control plan and other related matters shall be stipulated by the central authority-in-charge.

If the land development and utilization referred to Paragraph 1 of the preceding article involves the application for the change in non-urban-land-use zoning in accordance with the Regional Plan Act or the application for the change in the urban-land-use zoning or the land reserved for public facilities, the obligator shall, in addition to acting in accordance with the regulations of the preceding article, apply to the authority-in-charge of relevant industry in advance with the outflow control proposal presented to ensure sufficient space of land development and utilization for outflow control facilities; then, the authority-in-charge of relevant industry will forward the application to the municipal or city (county) authority-in-charge which the land is under the jurisdiction of for approval.
If the land development and utilization referred to in the preceding paragraph is under the jurisdiction of a central agency, the outflow control plan shall be approved by the central authority-in-charge.
Before the outflow control proposal is approved, the authority-in-charge of land change shall not change the land zoning or use referred to in Paragraph 1 without permission.
The outflow control proposal shall include the following particulars:
1. Overview of land development and utilization.
2. Survey of the base status.
3. A peak discharge reduction scheme.
4. Other related documents.
Regulations governing the submission, review and approval of the outflow control proposal and other related matters shall be stipulated by the central authority-in-charge.

The peak discharge reduction scheme referred to in the preceding two articles shall be able to reduce the peak discharge increasing due to the land development and utilization, making the peak discharge after the land development under the inspection standards lower than that before the land development.
The Check Criteria referred to in the preceding paragraph and the calculation method for peak flow shall be announced by the central authority-in-charge.

When the land development and utilization is determined by the municipal or city (county) authority-in-charge which the land is under the jurisdiction of to meet one of the following conditions, the obligator shall be exempt from acting in accordance with the regulations prescribed in Articles 83-7 and 83-8:
1.Where the entire scope is included in a soil and water conservation plan or the parts not included in the soil and water conservation plan do not reach a certain scale referred to in Paragraph 1 of Article 83-7;
2.Flood control facilities, water reservation or tidal wave control construction developed by an authority-in-charge of relevant industry; or
3.Public construction developed in response to disasters or major events.
If the land development and utilization is under the jurisdiction of a central agency prescribed in Articles 83-7 and 83-8, the determination referred to in the preceding paragraph shall be made by the central authority-in-charge.
Regulations governing the determination of the obligator’s exemption from acting in accordance with the regulations prescribed in Articles 83-7 and 83-8, as prescribed in Paragraph 1, shall be stipulated by the central authority-in-charge.

When an authority-in-charge reviews the outflow control plan or outflow control proposal and its change in accordance with the regulations prescribed in Articles 83-7 and 83-8, a review fee shall be charged according to the standards stipulated by the central authority-in-charge.

An authority-in-charge or a municipal or city (county) authority-in-charge may commission a professional institution or organization, such as hydraulic professional engineers, soil and water conservation professional engineers or civil professional engineers, to review the outflow control plan or outflow control proposal or supervise and audit the outflow control facilities, respectively.
The outflow control plan or outflow control proposal shall be conducted certification by the professional engineers, such as hydraulic professional engineers, soil and water conservation professional engineers or civil professional engineers.

New or rebuilt buildings shall be equipped with permeable, water retaining or flood detention facilities. The scope and capacity of the aforementioned facilities shall be stipulated by the central authority-in-charge of buildings in accordance with the building laws and regulations.