Developing The Stormwater Master Plan

These tasks go hand and hand with the City Public Works Drainage Division which administrates permits, and is responsible for the implementation and the execution of stormwater best management practices through the use of various resources such as personnel, and medium and heavy equipment. Public Works maintains more than 350 miles of storm sewer drainage system within the City and approximately 150 miles of drainage ditches and thousands of storm water inlets. Public Works crews work continually throughout the year removing trash and debris, mowing drainage ditches, vacuuming stormwater inlets, as well as other tasks to maintain a healthy drainage infrastructure. Unfortunately, the City is faced with the challenges of sustaining its extensive MS4 program and existing drainage infrastructure due to the lack of additional financial resources. Certain sections of the City’s drainage system are more than 50 years old and deteriorating. As the City continues to grow and expand, the need for repairs, retrofitting and maintaining the City’s existing infrastructure is as equally important as creating new capital projects.

Most parts of the city are only about 14 feet above water level. Only areas lying closer to the foothills and on Karewahs (plateau-like terraces) towards north beyond Naseem Bagh and towards Chadura on south have high contours. Poor loam is found in low lying areas near swamps on the west, which restricts the vertical construction. The Flood Hazard Assessment Map of the city is given in Figure

Next, it is necessary to identify the land that is possibly flooded and this can be calculated as:

The primary goals and objectives of the City’s Stormwater Utility are to proactively maintain the existing stormwater infrastructure and identify the City’s future stormwater system needs and improvements that protect its natural resources, enhances the City’s aesthetics, ensures public safety and improves the quality of life for all who live in and visit our city. This can only be accomplished through partnerships with all city departments, regulatory agencies, developers and the public.

The watershed model is used to develop projections of peak stream flows and water surface (flood)

17. "Trinity River Basin Master Plan," Trinity River Authority of Texas, 2010, http://www.trinityra.org/downloads/Master Plan Justified REV.pdf,

These nearby areas also implement a National Pollutant Discharge Elimination System, and NDPES. To control and systematically fight off hazards, there is an intial phase of obtaining an NDPES permit. This permit works hand in hand with a Stormwater Pollution Prevention Plan, an SWPPP. The SWPPP describes the new project site that is being proposed usage. Essentially it details the means in which will help keep the area safe as well as its maintenance for potential incoming

Beginning in the late 1990’s the city realized the importance of stormwater management and initiated the necessary steps to identify and minimalize the adverse effects of inadequate drainage infrastructure. Although the city had adopted stormwater regulations for new development, older developments and roadways in the city were not regulated prior to 1984 and many of those drainage systems

In 2013, the District promulgated Stormwater Management Regulations as required by a permit issued by EPA for the Municipal Separate Storm Sewer System (MS4). The District has elected to apply these regulations to both the separate and combined sewer system. Notwithstanding that fact, the District and DC Water have agreed in the draft MOU how the regulations will be applied to the GI Controls. The draft MOU provides for DC Water to pay all permit fees and the scope of the stormwater regulations that apply to the GI facilities is substantially reduced compared to a typical development project. This is because the purpose of the GI facilities is to control stormwater and they are not being constructed

The mean for 100-year flood at ungauged river sites within the Apalachicola-ChattahoocheeFlint (ACF) River Basin is 8855.824, this value is importance in that it tells us the average of our data. The standard deviation is 5709.88 which gives us the summary the amount by which every value within a dataset varies from the mean. The max value of the data is 33300. As shown in the appendix figure 1 Illustrated Boxplot of the annual peak streamflow of with mean of 8856, the median of 6440, first quartile of 5260, third quartile of 10950, min of 2350 and max of 33300.The correlation coefficient between Peak and zp is 0.8895443 and the correlation coefficient between lnPeak and zp is 0.9829135.Figure 2 illustrated Histogram Plot of Annual Peak

The purpose of this report is to geologically evaluate the potential hazards for flooding in Hazard City. This report will include a detailed historic and extrapolated Stream Gauge Data Worksheet, as well as a graph of the Discharge Frequency Curve expected on Clearwater River. The report will provide Hazard city with my scientific analysis, conclusions, and provide recommendations concerning potential flood damages.

Prior to 1890, Seattle relied on an assortment of sewers and cesspools that, at best, drained into surrounding lakes and salt water. Faced with recurring threats of waterborne diseases including typhoid and cholera, Seattle's first centralized combined sewage system was planned in 1891. This plan sought to remove as much city sewage as possible into the salt water of Elliott Bay and the Puget Sound with more limited drainage into the fresh water of Lake Washington.

The primary goal of flood hazard mapping is to act as an information system to raise our understanding and awareness of coastal risk. Flood hazard mapping is essential for accurately designing and planning for flood-prone areas. It provides easily understood and easy to read maps which includes of identification of areas prone to flood. Most of the time, these flood hazard maps are associated with rapidly- accessible charts. With all of these, it can greatly help lessen casualties and pose for good response efforts when flooding occurs. Flood hazard maps are designed to increase awareness of the likelihood of flooding among public, local authorities and other organisations. People who live in areas that are prone to flood are also encouraged

The water level (observed) and water level (simulated) water levels and the variation over time were graphed below in figure 5.

Water purification and a wastewater treatment plants would be necessary in order to provide the citizens and visitors with clean healthy water. To prevent flooding, this city was built on flood plains.