Xiangyang Marathon Portable Toilets

The planning of portable toilets for the Xiangyang Marathon should be systematically designed by integrating track characteristics, runner needs, and environmental requirements, covering key aspects such as configuration priorities, quantity calculation, type selection, and logistics scheduling.

1. Leasing Configuration Priorities
The primary need for marathon runners during the race is urination, necessitating dynamic adjustments to toilet distribution based on hydration and urination cycles. Drinking stations are set up every 2.5 kilometers along the track, with runners typically reaching peak urination 30 to 60 minutes after drinking. Intensive hydration in the first half of the race leads to concentrated urination demands in the latter half (between the 15- and 30-kilometer marks). In this section, runners slow down and spend more time, reducing the turnover rate of individual toilets and requiring increased toilet density. Other sections can be arranged at regular intervals to avoid resource waste.

2. Leasing Quantity Calculation
The International Association of Athletics Federations recommends one toilet per 300 people, but due to the high mobility of marathon runners, calculations should be made by track segment. Assuming 20,000 participants, runners pass through each kilometer of the track in approximately 5 to 10 minutes, with no more than 5% of the total number (i.e., 1,000 people) staying simultaneously during peak times. Based on each toilet serving 12 to 15 people per hour, 3 to 4 toilets are needed per kilometer, totaling approximately 130 to 170 toilets for the 42-kilometer track. Additionally, as peak urination demand occurs 2 to 4 hours after the start, a 20% reserve of toilets should be allocated for emergencies.

3. Selection of Portable Toilet Types

• Flush Toilets: These have a large capacity and long cleaning intervals, making them suitable for start/finish areas, but they require supporting water supply trucks and sewage collection equipment.
• Waterless Packing Toilets: These use biodegradable bags to seal waste, requiring no external water source, and are suitable for the middle sections of the track. Each unit can serve 50 to 60 users continuously but requires dedicated personnel to replace the bags.
• Chemical Flush Toilets: These use storage tanks for circulating flushing, with each tank accommodating about 200 users. However, chemical agents may contaminate the soil, necessitating compliant waste liquid treatment (e.g., sedimentation and dilution before discharge).

4. Logistics Scheduling in Leasing Services
Toilet installation and securing must be completed by dawn on race day, with groups of toilets (containing 2 to 3 units each) placed every 500 meters along the track to prevent runner congestion. An additional 20% of the total toilets should be allocated to start/finish areas to handle peak usage before and after the race. Transport vehicles should enter in batches according to track closure times, prioritizing toilet setup in the latter half of the track before completing the front half and start/finish areas. All toilets must be removed within 4 hours after the race, with heavily contaminated units transported separately to treatment stations. The leasing company must provide proof of harmless waste treatment to ensure environmental compliance.