the trench with or without use of the threaded rod 121 visible in fig5 is a right rebar clip 138 comprised of a right cylindrical hole 134 and a right slot 132 in use rebar is inserted into the hole and secured by drawing the slot against the chair body using fasteners not shown in fig5 the channel chair is installed by driving the threaded rod into the ground below the planned trench drain route and rotating the threaded rod to anchor the arrowhead in the ground the foot is pressed against the ground using the adjusting nut alternatively the channel chair may be supported by two rebars attached to the ends of the channel chair by rebar clips the mount is attached to appliance rails on each side of the channel via the ears one channel chair is used for each channel fig6 is a cross section of the embodiment sloping channel 100 and grate 111 with an attached upright elongated anchor of fig5 taken at arrows 6 6 the channel elements of fig6 are the same as in fig2 visible in fig4 is the channel chair 120 with threaded rod 121 foot 128 foot adjusting nut 129 arrowhead 122 and mount adjusting nut 130 and left side rear ear 125 with left side rear ear notch 127 attached to mount 123 along with right.