Question

3. Compute a weekly evaporation rate (in mm/week) from the surface water reservoir applying the following recorded data: average inflow into water reservoir = 32.5 m3/s, average outflow from reservoir = 40.2 m3/s, average rainfall during the week = 73.6 mm, surface water reservoir area = 15.8 km², estimated total water infiltration or seepage out during the week from this reservoir = 0.25 million m”, reservoir storage at the beginning of week = 9180 ha-m (hectare-meter), reservoir storage at the end of the week = 8630 ha-m.

Answer 1

PAGE NO.: Average inflow into water reservoir + 32.5 m/ average outflow from reservoir = 40.2 m/s average rainfall during the week 5) 73:6 mm swiface water reservor area = 15.8 km² estimated total water infiltration or seepage out during the week from this reservor = 0,25 Mm3 reseruor storage at the begg beginning of week gido hac.m. reservoir storage at the end of weetc ) 8630 hacim. reservoir storage is based on water bage budget. equation. the mass inflow - mass out flow. i) change in To Storage Storage of reservoir at the end is decreasing. hence. - change in storage of 8630 - 9180 - - 550 hacimi Total mass inflow & Rainfall + average inflow 2 (73:6X16*X 15:8 X106x164) + 32.5XFX24X3600 x 16) +(916:288 +1968-6) nacim = 2081-888 hacım Total mass outflow - seepage & outflow & Evaporation 2 (0.25 X10 X10) + (90.2 x7x24x360u xio") + Evaporation - 2456.296 hacim + Evaporation

DATE: PAGE NO.: from water budget Total mass inflow - equation Total mass outflow) = Change in storage (2086. 888) - (2456 2016 + Evaporation) -5 -550 Evaporation - 175.592 hacom Evaporation rate (in mm/week) & 175.592 x 10 x103 - 15.8 x 186 > 111-134 mm. week Summary : Evaporation rate of reservolr - 111: 134 mm week