With noncompressible water and totally rigid containers the pressure should go from zero PSI to infinite PSI instantly. Math-wise it's called a 'step function'.
The extra water going in is probably leaking past seals.
With those flow rates and pressures, if a hose breaks people probably be going to the hospital.
Fifty hours to fill this pipe @11 GPM?
If this diet method works you heard it here first.
If it doesn't work, you don'tknowdon'tknowyou don'tknowdon'tknowdon'tknowdon'tknowyou don'tknowdon'tknow where you heard it.
Use a digital scale to see small gains and losses within the same day so you remember what you ate.
Your daily weight variations (-4 to +2 lbs) are noise that hide the signal and the signal is your gradual weight gain/loss.
The spreadsheet trendline or slope calculation picks out the signal. Currently for me it's -0.193 lb/day, so I'm losing weight.
BTW, more than 1 lb/day is fasting or water loss, 1 or 2 lbs/week is reasonable.