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===== Design Parameters =====
Determining an accurate design flow, or how much wastewater is generated at the facility, is a good starting point when designing a wastewater system. City engineers are estimating that the average flow from the Jaro market is 12 cubic meters per day. This is a good initial estimate and provides a baseline for further investigation and refinement for developing the design flow value. To determine an accurate design flow, engineers will verify water consumption figures from the water district. Because a wastewater system must be designed to accommodate peak flows, some estimates for converting the monthly water meter data to peak daily flow will be required. For example, if water meter data for a peak month is used, the value is divided by the number of days in the month and the result multiplied by a peaking factor. A peaking factor of 1.5 or 1.7 (the appropriate peaking factor is determined through local knowledge) will estimate peak flows from average flow data. This will also help to build in some margin of safety to ensure that the system will not be undersized. Engineers are working now to determine the proper peak flow number and identify the wastewater system design flow from which the detailed engineering designs will be based.
===== Proposed Wastewater System Components =====
Engineers are recommending that the wastewater system include the following components:
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===== Secondary Treatment - Constructed Wetlands =====
The constructed wetlands, otherwise known as a planted gravel filter, will treat the wastewater to a point where it may be safely discharged in compliance with environmental standards. Wastewater from the ABR tank will flow through the inlet structure of the constructed wetlands where it will be evenly distributed through the gravel media. As this is a subsurface flow wetlands, all of the wastewater will be maintained below a layer of gravel and mulch.
There are several good examples of constructed wetlands systems for public markets. The photo provided here is from the BORDA-developed system at the Dumaguete Public Market. Constructed wetlands not only help treat wastewater, but they add aesthetic values as well. They may also be used to develop microenterprise projects through the sale of cut flowers or hydroponically growing saplings for the reforestation industry.
===== Cost Estimate =====
City engineers are developing a detailed cost estimate for the Jaro market wastewater project. Initial estimates are provided below:
