Hello Karki,
Greetings from Samoa.

(a)    How long did it take to de-water the biodigester pit prior to construction?.
(b)    What was the volume of water that was removed?.
(c)    How did you disposed of the water?.
(d)    In relation to the water table, apart from de-watering were there
        any other special consideration during construction of  the biodigester?
(e)    What is the effect of the water table on other subsystems, in
        particular the drying or compost pit.
(f)    The soak pit in your flow chart seems redundant as an IBS unit?.
(g)    What is the life span of  compost materials in the compost pit.
(h)    What is the cost of construction of all the systems? and expected return to capital?

Have a nice day.

 Asifo O. Ajuyah (Ph.D.)
 Senior Lecturer Pig and Poultry Production
 The University of the South Pacific
 School of Agriculture, Alafua Campus, Samoa