Rain on Grid (hecras 6.1) model has huge Precip. Excess in mm and fails

[Mike Andreadis]

Hello,
I am working on my thesis which is a modeling run of rain data collected by three stations of which, i monitor a stream which collects all the rain from a basin and I check if it will overvlow, how much etc.
i have spatial data of the island, such as DEM (terain), which i edit it to have the bathymetry of the stream, the Geometry which i created (contains river (bank lines and flow path), Cross section , Storage Area, 2D Flow Area (Perimeters, Break lines), Boundary Condition Lines (1 which is outflow outside of the boarder of the 2D flow area). I have the correct projection (confirmed with map layer).
So i go to Edit unsteady flow data and at B.C tab, my river i hasn’t an option for B.C so i let it be, at the storage/2D flow Area i chose Flow Hydrograph which i enter 0 flow at all the time of the simulation, and the EG slope at a given number (0,01788).
At Initial Condition tab , some cross stations are enabled to enter initial flow which i use 0.
At Met. Data tab, i enable Precipitation, and i edit 3 station with x,y, and the mm/h data, which are INST/Val, the time of sim is from a specific day and 0:00:00 to 5 days later, 23:00:00 hour.
So then i go Run Unsteady Flow analysis,
tick Geometry Processor, Unsteady Flow Sim, Post Processor, enter the dates and times, and select for Computational interval and Hydroraph Interval : 30 mins, Mapping and Detailed Output Interval : 1 hour. Other settings are default.
When i run the bellow mesage comes at output file.
HEC-RAS – River Analysis System

Project File: c:\———————-.prj

Project Name: —————

Plan Name: Plan 05

Short ID: 4

Starting Time: 21Nov2015 0100

Ending Time: 26Nov2015 2300

################################################
# #
# #
# 1D and 2D Unsteady Flow Module #
# #
# #
# HEC-RAS 6.1 September #
# #
# 09JAN22 at 11:50:09 #
# #
################################################

*** Volume Accounting for 1D Flow Area in 1000 m^3 ***

US Inflow DS Outflow Lat Hydro SA Hydro Groundwater Diversions Precip Excess Precip Excess
(m^3) (mm)
********* ********** ********* ******** *********** ********** ************* *************
477.9 485496864.

Start 1D Reach Final 1D Reach Starting SA’s Final SA’s
************** ************** ************* **********
0.001569 1375.

*** Volume Accounting for 2D Flow Area in 1000 m^3 ***

2D Area Starting Vol Ending Vol Cum Inflow Cum Outflow Error Percent Error Precip Excess Precip Excess
(incl. precip) (m^3) (mm)
******* ************ ********** ********** *********** ***** ************* ************* *************

Watershed_Ag_Har 13.81 11.64 2.163 18.58 11.64 11832413.

*** Total Volume Accounting (for the entire model) in 1000 m^3 ***

Total Boundary Flux of Water In 489.5
Total Boundary Flux of Water Out 0.000000

Starting Volume 0.001569
Ending Volume 1389.

Precipitation Excess (m^3) 489.5
Precipitation Excess (mm) 248702401.

Error Percent Error
***** *************
899.2 183.7
If anyone has any syggestion please reply. If more info or files needed reply!
Thanks in advance,
Mike.

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