(a) What is the working status of the pumps delivering water from the Heyshope Dam in the Usutu catchment to the Vaal River upstream of Grootdraai Dam, (b) what was the capacity transferred in each month in the (i) 2015 and (ii) 2016 calendar years, (c) how many of the pumps worked during the specified period and (d) what amount was spent on the pumps during the period?