การเปรียบเทียบอัตราการซึมน้ำเฉลี่ยต่อต้นทุนการก่อสร้างของสวนซับน้ำฝน

Abstract

In order to reduce the amount of runoff, there are several ways to reduce the environmental Natural and human-induced factors can cause flood disasters in urban areas. Utilizing natural processes such as retention, detention, and infiltration into the groundwater is the least disruptive. It does not destroy the natural ecosystem in line with the principles of WSUD or LID. Developing rain gardens can increase water absorption capacity. This research aims to compare the average infiltration rate per construction cost of rain gardens using a Double Ring Infiltrometer in the engineering faculty area of Chiang Mai University. The study tested four different ratios of soil to sand in the Filter Media Layer. The coarse sand, with an average price of 468 baht per cubic meter, was used as the cost material for construction. The average infiltration rate per construction cost for the four ratios are as follows: the 1:1 ratio is 6.98 millimeters per hour per 100 baht, 1:2 ratio is 7.26 millimeters per hour per 100 baht, 1:3 ratio is 7.66 millimeters per hour per 100 baht, and 1:4 ratio is 7.93 millimeters per hour per 100 baht. It can be observed that as the average infiltration rate increases, the construction cost of rain gardens also increases. However, when determining the soil-to-sand ratio in the Filter Media Layer, consideration should also be given to the choice of plant cover to create a relaxing and recreational space or community park in the area.