تحسين كفاءة شبكة تصريف مياه الامطار باستخدام تصميم مرشح

Improving Efficiency of Storm Water Network Using a New Galley Design-Filter Bucket

Storm networks as urban infrastructure are important elements in the society. One of the most critical problems facing such networks is the clogging of pipes due to sediment inlet into the sewer systems, which can cause flooding during heavy rain. This study aims to improve the efficiency of storm network by using a new filter.

    This study presents an experimental model, in which a buildup model contained a network of pipes used to simulate the rain as well as the street surface with two sides, in the first side contains gully with filter, while the other side contains gully without filter. Several variables effects on the passing ratio from gully with filter to gully without filter were studied, such as rainfall intensity, length of filter, duration of intensity and slope of floor.

    A numerical model FLOW-3D was verified by using experimental work, and the purpose of numerical model to study a new variable not getting in the present experimental work like diameter of sediments. Five different intensities of rainfall were used 30, 37, 44, 51 and 58𝑚𝑚ℎ−1, each intensity is runoff on the floor with five slopes 1,1.5,2, 2.5 and 3. For a length of filter were also used 100,150,200,250 and 300mm, while the duration of rainfall intensities were 5, 10, 15, 20 and 25 minutes.

    Results indicated that the slope of the ground and the length of filter were the most influential factors affecting on passing ratio of gully with filter to gully without filter(𝑀𝑓/𝑀𝑔). The relationship between the efficiency of filter and passing ratio (𝑀𝑓/𝑀𝑔) was the inversely related. The passing ratio (𝑀𝑓/𝑀𝑔) was 35% for the minimum slope of the ground, and 11% for the maximum slope of ground. It was observed that the passing ratio decreases when the length of filter in filed is more than 400mm. The duration of intensity has a less important effect on the passing ratio than other variables. The results also showed that the passing ratio(𝑀𝑓/𝑀𝑔) was 34% at a low rain intensity of 30 𝑚𝑚ℎ−1and 12.5% at a high rain intensity of 58 𝑚𝑚ℎ−1, while it was 37% and 13% for minimum and maximum diameter of sediment, respectively.

     The results also concluded that the use of FLOW-3D to simulate these phenomena gave acceptable results, as the maximum error between numerical and laboratory model was less than 16%. The dimensional analysis prediction model provides effective methods to predict the behavior of passing the ratio of gully with filter to gully without filter. The numerical model helped in providing a statistical equation to calculate the passing ratio (𝑀𝑓/𝑀𝑔), where the using of SPSS model to estimate the passing ratio gives result that agree with (R2 = 0.88)