embankment soil since the support means is constructed in the same manner as in the first embodiment detailed description thereof will be omitted herein the accommodating section 260 is defined by forming an eighth stitched portion 118 through folding the other end of the reinforcing geotextile mat 200 and stitching the folded end to the reinforcing geotextile mat 200 while it is preferred that the accommodating section 260 be embedded in the embankment soil in a state in which a drainpipe 290 having a predetermined length is accommodated in the accommodating section 260 the accommodating section 260 can be embedded in the embankment soil without using the drainpipe 290 the drainpipe 290 not only serves to fixedly hold the reinforcing geotextile mat 200 in the embankment soil but also is formed with a plurality of through holes 291 to drain water contained in the embankment soil to the outside the above described reinforcing geotextile mat 200 is manufactured as shown in fig4 a through 4c first as shown in fig4 a on one end of the reinforcing geotextile mat 200 a first opening 201 a second opening 202 and a third opening 203 are defined by cutting portions of the reinforcing geotextile mat 200 to have a predetermined interval and a predetermined length and from the other end of the.