# Civil Engineering - Water Resources Engineering - Discussion

### Discussion :: Water Resources Engineering - Section 3 (Q.No.22)

22.

The respective storm totals at three surrounding stations A, B and C are 110, 90 and 70 mm. If the normal annual precipitation amounts at stations X, A, B and C are respectively 1000, 1100, 1200 and 1250 mm, the estimated storm precipitation at X is

 [A]. 75 mm [B]. 77 mm [C]. 79 mm [D]. 81 mm.

Explanation:

No answer description available for this question.

 Vinay said: (Jan 14, 2016) Precipitation at X = Nx/m [P1/N1+P2/N2+....+Pm/Nm]. M = Number of stations minus 1. Hence, Px = 1000/(4-1) [110/1100+90/1200+70/18] = 77.

 Ghost said: (Nov 15, 2017) Precipitation at X = Nx/m [P1/N1+P2/N2+....+Pm/Nm]. M = Number of stations. - 1(4-1=3). Px = 1000/(4-1) [110/1100+90/1200+70/1250] = 77.

 Akshay said: (Jun 6, 2018) There are 2 methods. 1)Arithmetic. 2)Normal Ratio. 1)Arithmetic: Take 10% of the missing storm means for x. (1000*(10/100))=100, Add 1000+100=1100, now subtract 10% from 1000, 1000-100=900, The normal annual rainfall for B & C are beyond values 900 and 1100. So second method should be used, 2)Normal ratio method: x=1/3{ [1000*(110/1100)]+[1000*(90/1200)]+[1000*(70/1250)]}, x=77mm.