17 May 2022 admin Hydrology, Hydropower One comment

Snyder’s Unit Hydrograph

To Plot snyder’s unit hydrograph we need value of basin lag (tpr), time base(tb) , width of hydrograph at 50% discharge(W50) , width of hydrograph at 75% discharge(W75) The peak time is distance from centroid of effective rainfall to peak of the discharge. where, tp = Peaking time in standard condition tpr = Basin lag in general condition C1=0.75 Ct=Watershed factor where, qp is peak discharge per unit catchment area Cp=Watershed factor C2=2.75 C3=5.56 The width of hydrograph at 50% […]

16 May 2022 admin Construction, Construction Material, Quantity Estimate Leave a comment

Dry weight of sand mortar

Mortar is heterogeneous mixture of cement sand and water. Water reacts chemically with cement ingredients resulting in hydration of cement and fills the voids between cement and sand. As water is added to dry cement sand mixture the volume reduced. For quantity estimate of cement sand mortar the wet mortar’s volume should be increased to account for Water required for hydration. Water required filling of voids. Dry weight of mortar = Wet weight of mortar * 1.33

16 May 2022 admin Hydropower Leave a comment