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Rainfall Runoff Modelling - Science topic
Explore the latest questions and answers in Rainfall Runoff Modelling, and find Rainfall Runoff Modelling experts.
Questions related to Rainfall Runoff Modelling
Dear all,
I am going to derive the precipitation data from NETCDF files of CMIP5 GCMs in order to forecast precipitation after doing Bias Correction with Quantile Mapping as a downscaling method. In the literature that some of the bests are attached, the nearest neighborhood and Inverse Distance Method are highly recommended.
The nearest neighbour give the average value of the grid to each point located in the grid as a simple method. According to the attached paper (drought-assessment-based-on-m...) the author claimed that the NN method is better than other methods such as IDM because:
"The major reason is that we intended to preserve the
original climate signal of the GCMs even though the large grid spacing.
Involving more GCM grid cell data on the interpolation procedure
(as in Inverse Distance Weighting–IDW) may result to significant
information dilution, or signal cancellation between two or more grid
cell data from GCM outputs."
But in my opinion maybe the IDM is a better choice because I think as the estimates of subgrid-scale values are generally not provided and the other attached paper (1-s2.0-S00221...) is a good instance for its efficiency.
I would appreciate if someone can answer this question with an evidence. Which interpolation method do you recommend for interpolation of GCM cmip5 outputs?
Thank you in advance.
Yours,
I have used the following parameters to simulate:
1. Loss method: SCS-CN, 2. Transform method: Clark UH, 3. Routing: Lag.
My simulated peak occurs 1 day after the observed peak.
It shows "Warning: Time of concentration increased to one time interval at subbasin X" which I'm assuming is the reason for the discrepancy.
What parameters can I adjust to shift the peak by 1 days and to esolve this error?
Thank you.
(Matlab, R, Python, ...??)
taking into account the current evolution of artificial intelligence
Can somebody provide a paper which states that the model validation efficiency tends to be lower than model calibration efficiency?
My study area is extremely large (multiple valleys) and precipitation is close to zero. Streams are often dry, but runoff almost solely comes from glacier melt and is heterogenous throughout the valleys. I have extracted stream boundaries for hundreds of basins using a machine learning algorithm and I can get channel geometry such as width/depth/cross sectional area (at any point along the stream), wetted perimeter etc. Is there any way I can get approximate velocity, discharge, etc at bankfull using stream geometry and a corresponding DEM? Maybe using slope and geometry?
any one know about how to prepare intensity duration frequency curve for estimation of peak flow for rainfall runoff modeling for ungauged watershed
I attended a training to learn Hydrological Modelling Using SWAT, which is a widely used model, back in 2018.
We discussed about the details regarding calibration and validation of a model and were told that 7:3 is like a golden ratio for calibration and validation. Basically, if you have 10 years of observed data, you calibrate the model for 7 years and validate the same for 3 years. As a beginner in hydrological modelling back then, I engrained this piece of information in my brain.
But as I keep reading through various research materials, I have realised that there is no obvious pattern or thumb rule for this. I recently read a paper which calibrated a model for 1 year worth of observed data while validating the same for 5 years.
So I'd like to know your approach when you work with a hydrological model and the factors which influence your decisions on how much to calibrate or validate.
After running a simulation in HEC-HMS, I'm getting the following warning:
Warning 42403: Time of concentration increased by one time interval (24h) in basin X.
This is causing my simulated hydrograph peak to occur 24 hours after the observed peak.
What can I do to resolve this issue?
Thank you.

I read a thesis which used the formula v = K(S^0.5) to determine the flow velocity in a channel. The value for conveyance K was adopted from Ward and Trimble (2004) and was mentioned to be equal to 5 for a river bed composed mainly of sand and gravel. Can anybody help me find the K value for a river bed which mostly consists of boulders with patches of vegetation?
Thank you.
I want to set up a minimum amount of outflow (1500 cumecs) through a junction or reach or basin so that if the inflow there is less than the value above, it results in zero outflow. Is it possible?
Can somebody please provide links to papers consisting of tables with maximum canopy storage values against corresponding landuses? Classification of landuse as used by ESRI is preferrable.
After running a simulationa and comparing the simulated discharge with Observed discharge the values of Nash Sutcliffe coefficient has been -40.473, and after optimizing the value comes out to be -8.216. Which steps can i take to have NSE to 0.65-0.80.
Which factors can i optimize.
Hello Everyone,
I am a hydrologist and want to model baseflow (i.e. surface-water groundwater interactions) via the development of a numerical groundwater model (GW model). One of the critical input parameters for the development of the GW model is the hydrogeology of the catchment in question.
Bore-well lithology datasets required for preparation of hydrogeology map or Fence Diagram is very limited (2 borewell logs only), Since, my study area lies in the headwater mountainous region. I am planning to do an electrical resistivity survey for mapping the hydro-geology of the basin in the catchment area of 102 Km2. I have a few questions, in planning Electrical survey in the basin-
1. What could be the optimum number of resistivity profiles required for appropriate representation of hydrogeology of the basin?
2. How to identify the most appropriate locations for Electrical resistivity profiling representative of the basin under consideration?
I request you all to give suggestions in this respect.
Thanking You.
Regards
Rajat
Hello everyone,
During calibration of a hydrological model using synthetic data, I was trying to add Gaussian noise to the simulated streamflow data. But many streamflow values are near to and equal to zero, if I add a Gaussian noise with certain standard deviation (lets' say 10%), it will make many data values negative. But streamflow data values as negative will be invalid.
Could anyone please suggest how should I proceed ? Also, cite studies which supports that method.
Hello all,
I have been trying to find out length of longest flow path, through GIS but it is always giving me the vlaue of 0.29 whereas my study area is 6896 km2. How to solve this problem.
Have a nice day everyone, I've created a watershed model via WEAP software for modeling water budget of a basin. Now, I'm planning to construct another model using another software/program for modeling the same area and compare different models' performances.
Lastly, I'd like to ask you about "Pysheds" model's weaknesses and strenghts, plus I'd be so glad if you could share with me tutorials through which I can figure out basics of "Pysheds"
Thanks in advance
I am looking for modelling tools that are capable of simulating the impacts of green infrastructure.
Hi all,
I was thinking about applying the downscaling statistical methods on GPM using the MODIS cloud level 2 . However, I am not sure about it from the prospective of its validity on arid or semi arid areas with low number of observations for instance.
Hi everyone
I am trying to run the CESM model, in order to evaluate teleconnection in a rising temperature levels, in low-mid atmosphere conditions and the rainfall patterns in the Andes of South America.
But, I am newbie in this, so I am having some troubles indeed, when I execute the ./create_newcase this command does not create a new folder into my directory, I was finding out what I did wrong but I am lost
Can anyone help with this one?
Thanks a lot!
HI everybody
I am trying to run the CESM-atm model, but I don't get where is the path for the data, I am attaching an image of what must be the structure of the path.
By the way, I am running this model in my personal lap, so I had to do the porting proccess before, so I don't think that would be really the problem here.
Could anyone explain me what I must do for downloading the data for the model?
Thanks a lot!

I have to implement Green Ampt Infiltration equation for daily time step with regional scale over different Land use/Land cover conditions. The Green Ampt parameters are estimated using soil properties, how the equation could be improved for different LULC conditions and what could be the effect of varying spatial and temporal resolution in model performance.
i wish to know how to decide whether we need to use MIKE Basin for a particular catchment or do we need to use MIKE Rainfall Runoff model NAM.
I want to work with HEC-HMS on rainfall-runoff simulation & when I wanted to build the catchment polygon layer, I faced the error that says:
"the system cannot find the file specified"
I searched a lot but I didn't find the way for my problem.
NOTE: The catchment grid layer has been built successfully, but when I checked it's file in the saving path, it had only 8 items, but the other layers had 9 items in their files.
It didn't have the log file, but the other layers had the log file. My system RAM isn't full.
What do you suggest for my problem?
I'm having a hard time using TopoIndex (which is the first step). It keeps on getting an error which says that the corrections did not converge (regardless of how many iterations). Any troubleshooting tips?
Is there any way to calibrate a rainfall-runoff model with Hec-Hms anything other than discharge? The thing is I don’t have continuous discharge data availability. But I have water level and cross-section data. Is there any way to calibrate through water level? It's important for the thesis project I'm working on.
For my future discharge forecast in the calibrated HEC HMS model, i need the precipitation data of the future.How can i get this data in the daily timescale?
Because I see that to estimate soil loss throught USLE, RUSLE models, some researchers use models that are not compatible with the study region?
My study area of rainfall-runoff modelling is in mountainous region and has snow cover. There is about 10 percent snowmelt contribution to the discharge of the river i am modelling. How can I include snowmelt parameters to enhance my study? any tutorials on snowmelt modleing in hec hms would be welcome..Thanks in advance
I am doing my project work in snowmelt runoff modelling. I have collected a Matlab code which I found very difficult to understand due to its complexity.
Hi all, i'm trying to implement the SM2RAIN algorithm in python for estimating precipitation in USA based on soil moisture observations, i started by gathering data on county level.
I used " NASA_USDA/HSL/soil_moisture" for the SM observations, basically the SURFACE SOIL MOISTURE (ranges from 0 to 25mm), the temporal resolution is 3 days (the lowest available one)
For the precipitation, i used "IDAHO_EPSCOR/GRIDMET" for daily observation, i resamplead the data to 3 day accumulated values.
I implement the algorithm using this code freely available on github " https://github.com/IRPIhydrology/sm2rain/blob/master/sm2rain/algorithm.py ".
I normalized the surface soil moisture values and got started with on county (320 observation)
I used the pearson's correlation R and RMSE as metrics for evaluating the output of the model.
The calibration process was processed on the whole dataset
PROBLEM:
The issue is that i'm getting a low R value (below 50%), and the simulated precipitation always has the same pattern as the soil moisture.
the simulated precipitation cannot catch the hight values of observed precipitation as you see in the attached file (orange color: observed precipitation/ blue color simulated precipitation [only 30 points in the graph]
Questions:
Did i choose the correct soil moisture variable ?
it is normal that simulated precipitation has the same pattern as the soil moisture ?
Any tips or suggestions are appreciated.
Thanks in advance.
I have downloaded the MSWEP sub-daily rainfall data (3-hourly data 0.1 degree resolution). I used MATLAB to convert it and obtained a table of dimensions 1800 x 3600 for a specific date. I am unable to understand how to interpret the resulting table. I am assuming the rows and columns represent latitude and longitude intervals. But I am not entirely sure of what the range is. I am a litle confused about how to interpret this. Any tips regarding this will be helpful!
Dear all,
I have prepared rainfall datasets for SWAT MODEL using 0.25 degree IMD long term gridded rainfall data,
but as I am using it in the model, it is rounding off the co-ordinates value.
eg:- for the latitude 19.75 and longitude 78.50, the name given to the file is PY1975X7850,
but in the textinout folder, the .pcp file for precipitation is rounding off the coordinates to 19.8 and 78.5.
If it is taking co-ordinate values to 1st decimal place only, then can't we use the 0.25 degree rainfall data in the input?
also it is not displaying the input data in the same format.
Kindly, refer to the attached video to understand the query.
Any valuable suggestions are highly appreciated.
Thanks.
What method would you recommend me to carry out a rainfall-runoff analysis with "limited" data (Monthly rainfall [series of 71 years], soil map, LULC map, DEM)? I wanted to use the SCS-CN method but I don't have daily precipitation data.
I am doing a small research to review the water related open source tools / software (e.g FREEWAT).
if you have used/developed/ heard of similar tools,please share it with me ?
Thanks in advance
I am new to HEC HMS. and i am thinking to perform rainfall runoff modelling of a basin near my area using HEC HMS. The data i have is rainfall time series data and flow data of my outlet point. I want to estimate the discharge and compare the discharge obtained from the model to that of the real observed data..how can i perform the modelling without using soil data as i dont have any soil data or soil classification data of my region (for SCS CN method)?
Hi. I need an open source QGIS friendly software to model runoff in a big basin in Africa (17.000 km2). I know how to do it in Hec-Hms but it seams a bit amateur, because the choice of CN depends on user criterion. I would prefer to use a software that use DEM to calculate runoff. In the other hand, and as far as I know, Hec-GeoHMS works only with ArcGIS. Am I right?
Can someone tell me the pros and cons of IHACRES, TOPMODEL and EPA BASINS/HSPF ?
Rainfall Runoff modelling by using Qgis Watershed
Here is the FAO Dependable Rain Method to computes MONTHLY effective rainfall
Pe = 0.8 P - 25 if P > 75 mm/month
Pe = 0.6 P - 10 if P < 75 mm/month
Where Pe is the monthly effective rainfall and P is the monthly rainfall
If I want to use the same formula to compute DAILY rather than Monthly Rainfall, can I do that?
DailyPe = 0.8 DailyP - 25 if daily P >2.5mm/day (or 75 mm/30 days)
DailyPe = 0.6 DailyP - 10 if daily P < 2.5mm/day (or 75mm/30 days)
Where DailyPe is the daily effective rainfall and DailyP is the daily rainfall.
This error apears only in subasins with a value superior than 19, 682 in the initial abstraction in the method SCS Number Curve.

See ⬇️, the upper bar has darker colours for larger errors, does it help the assessment of the agreement of obs (green) vs sim (red)?
Ex using different 🛰️ 🌧️ products, including #SM2RAIN https://www.earth-syst-sci-data.net/11/1583/2019/


I have eight rainfall events with length of 476 days. i want to predict the peak discharge and peak time.
Hi all,
I want to run a runoff simulation in a catchment and almost finished my model in python but, my concern is how to measure the impacts of an increase in 20% of the rainfall in the catchment. Should I increase the original rainfall dataset by 20%? or should I code the increasing part independently?
Thank you very much for your help.
Hello everyone!!
i'm predicting the future rainfall using SDSM Software.
while calibrating (Period 1970 to 2000) the model for, conditional monthly frequency, SDSM is giving an error says " An error has occurred- please check all the selections. overflow has occurred ".
checked for the Predictand length it looks perfect for 366 days a year setting.
Predictors are Canadian Based NCEP-NCAR (1961 to 2005) of the box (27x , 41y) seems correct, all the variables appears while calibrating.
not able to Debug please do help.
check the Attachment for the error message.
Hi,
I have a question for all the soil scientists and geo-hydrologists around.
We want to model the runoff behaviour of a couple of watersheds where some soil and water conservation measures will be implemented (something like small trenches to retain runoff).
Our model is something simple and we are building it for an area with little data available (thus the need to stay simple). We want to roughly estimate how much additional water (runoff and direct rainfall) can be captured by the soil and water conservation structures. The model is a simple water balance for which we need infiltration values (measured with mini disk infiltrometer), which in turns is influenced by soil texture.
We have collected quite a number of samples at surface (0 to 20 cm) and subsurface (20-50 cm) for this. Here is my question for you:
When on a budget constrain, which depth would you prioritize to characterize texture - surface or sub-surface?
Our gut feeling is to prioritize the surface samples, but i would love the opinion of some scientists with hands on experience (possibly with some references to prove the point).
Any thought on this would be much appreciated!
Thanks a lot everyone,
Francesco
It can be lumped to a catchment level (with average rainfall and % of land cover types e.g. forest, agriculture, urban) or raster cell based. I agree that, there are many other factors such as topography, soil type, evaporation/evapotranspiration, distance to reach as well as daily/event rainfall distribution that influences the river discharge. But at the moment, the purpose is to compare the net change in river discharge (or runoff) in relation to change in rainfall and/or land use land cover only without needing to specify other information.
I tried the Soil curve number method using land cover and hydrologic soil group, but found it not suitable for monthly or annual data as the response for various amount of rainfall differ a lot and it is aimed for event level runoff estimation.
Thanks a lot for the help
Dinesh
Rainfall Runoff Modeling Using HEC-HMS
I have a Annual Rainfall time series data (1987-2017). I am determining the trend in the data using MK test. However I found that if there is a serial correlation we should go for MMK test.
Therefore I calculated correlation coefficient at different lags for the original data (upto10 lags) and found that the correlation coefficient are within the tolerance band (within upper limit and lower limit at 5 % significance level) except at lag 4 it is above Upper limit.
Does this mean the series is autocorrelated?
What is the criteria for going for MMK test?
Do we really need to perform student t test corresponding to lag 1 correlation coefficient? Is this test justifiable?
This makes me confused because at lag 1 there is no auto correlation (it is within tolerance band) however at lag 4 there is auto correlation.
So there is mismatch. Student t test would entail no autocorrelation whereas the correlation coefficient at lag 4 entails there is auto correlation.
Your help would be appreciated
I have a question about your work (Fuzzy Logic).
In forecasting something using FIS toolbox (in matlab) how to use previous output (T-1) as one of inputs?
I am trying to calibrate a hydrologic model for a large watershed in central Mexico(Lerma). I found several stream gages in the watershed, but hourly streamflow data from the gages is not consistently available till 2018. Also, I haven't been able to find any historical rainfall data. To collaborate my model, I need both rainfall & runoff data.
Can someone suggest any source to download rainfall and runoff data for the central Mexico-Conauga?
I would truly appreciate any help.
What data do we need?
I got 35 years of daily data of rainfall and river discharge.
I am working on this project for my final year research project in civil engineering.
The soil erosion rate level is different across the region, what is the acceptable erosion risk level for construction activity ? Any reference or comparison between country or region ?
Hi, I am working on road improve project in Africa Region. Of course we are going to project main road and its infrastructure system. We are developing main drainage and support drainage systems. Because of project site morphologic and climate conditions, runoff harvesting is main issue for our project. We will use roadside drains, outfall chanel, ponds in our project. I'm wonder what you think about following topics:
- How do you think we should calculate ponds-outfall channel shapes, lengths, diameters ?
- How do you think we should solve complex interaction between culvert or pipe structure under road and roadside drains (ponds-outfall channel) ?
Thanks.
The best design consideration in design sediment basin.
Hi everyone,
Can anyone guide me how to use SCE-UA to get the optimized value of parameters, especially parameters from rainfall runoff model. I found one SCE-UA script written in matlab language, however, I can't find any part of the script is related to parameter of model.
Is there any model available to predict surface runoff temperature?!
As part of my research, I am modelling runoff discharge on a rural watershed. I would like to activate Land Use Update with SWAT. I am using ArcGIS 10.3.1 with ArcSWAT, along with SWATCUP 5.1.6 for automatic calibration. I used SWAT LUU tool (see https://saraswat-swat.rcac.purdue.edu/swatluu) to prepare inputs lup.dat and relevant files for 3 differents land use scenerios (2004, 2009 and 2017). My simulation goes from 2004 to 2017, with one year warm up (2004).
I noticed that when I run SWAT-CUP, it seems to find lup.dat, since deleting any of the associated *.dat files containing HRU fractions (HRU_FR) values returns an error. However, during the auto-calibration process, *.hru files are constantly edited, but their HRU_FR (first line) does not change. As such, it seems that land use update does not work.
Are there any recommended guidelines or anything I have missed ?
In case any information is needed upon this, I would be glad to provided them.
Thanks in advance.
Roland.
Over the years, there have been numerous techniques developed to analyse baseflow recession as well as derive a recession constant, K (Hall, 1968, Vogel & Kroll, 1996; Kienzle, 2006; Dijk, 2010; Beck et al., 2013).
How you do select the range (start and end points) on the recession limb to derive the recession constant / do recession analysis?
Why did you use that rule? How is it advantageous over the others?
Is there any way to compute effective rainfall in Australia ? Like the the SCS-CN method for the US. It has to be specific to Australia, preferably from observation/experimentation in the field (empirical equation). I am looking for something different from the Dependable Rain (FAO) or the USDA soil conservation service.
I'm searching for some softwares (or methods) that can help me to model the fate of pharmaceuticals (or pesticides/chemicals) from runoff in agricultural soil.
I tried to use RZWQM and PRZM but without satisfying results; other ideas?
Does anyone has a simple empirical formula to compute Daily effective Rainfall for any location in Thailand?
Thanks
hello everyone!!!
we are doing rainfall runoff mdelling Using SWAT.
we have two gauging sites where levels are measured.
one locations is weir and another one is controll crossestion.
both the locations are very close to sea. levels measured at both the sites are affected by the sea level variations.
i would like to correct these levels before using it for callibration and validation (we have stage disgharge relationship to convert levels into discharge) .
Note: we dont have the sea levels data.
Hello everyone!!
I would like to know , How to convert hourly stream flow discharge to daily discharge ?
Please help
Dear All Prof, lecturer, and researcher. I am Ali Rahmat, Master student of Gifu University. I am in confuse condition, I get home work from my supervisor to separate direct runoff and baseflow but I only have total runoff (water discharge). I try to approach used electric conductivity and water temperature data but still can not prediction when direct runoff stop.
Did any equation to prediction direct runoff and baseflow? or another technic to separate?
Thank you very much
I'm currently trying to study the flash flood risks in an ungauged area. Is there a recommended way to calculate the daily accumulated rainfall data in a certain location using satellites like TRMM ?
Hello! I am working on the project" Rainfall Runoff Modelling on Mahi lower sub basin".I want to calculate runoff but i got only Daily Rainfall data & other meteorological data of various rainguage stations.so from this data how can i calculate the runoff? can anyone help me please.
i am doing research in runoff and sediment yield for kabul river basin in Afghanistan by SWAT model but i am new in using SWAT can you help me how to solve the problem of the attach ?


Hello Everyone !!
i'm just wondering what would be the difference between event based rainfall runoff modelling and continuous rainfall runoff modeling.
as far as i know both these type of modelling may affect to the Model calibration but how they exactly differs from each other i don't know. please help me in understanding.
Hi! I have a question about how to calculate rainfall depth from rainfall intensity. I got the data from tipping bucket rain gauge which produce an excel file contain time series, rainfall intensity and rainfall. The rainfall here is constantly 0.1 mm, so I can not use this data as rainfall depth. I want to plot the rainfall graph (in mm) so that I really need this data. Is it as simple as dividing the rainfall intensity by the duration? Mostly the duration produced is every 5 minutes, but some not. Because if I just divide the rainfall intensity with the duration, it may produce the average value.
I attach the excel file I got from the rain gauge. ULL00317_2 here contains rainfall intensity and ULL00317_1 contains rainfall which constantly 0.1 mm.
I have been trying to find the literature but I found nothing. Mostly the literature have the data which have already processed as rainfall and rainfall intensity. I hope somebody can help. Thank you.
Dear Expert
I have tried to simulate the hourly rainfall runoff events, peaks are matching but after peak the discharge at which it has to recede is not as expected as seen in the attached file.
Can you please advice me the tuning parameters for that in HEC HMS.
when am looking the elevation value in the SRTM and ALOS over the river both are giving the different values. Among the two which cane be used and why.?? I f anyone can suggest me some research regarding comparison of these two DEM over rivers.
Hi all,
I have a watershed in a coastal plain with a total contributing area of 1000 mi2. I have 60 yr of daily discharge data (from a stream gage) covering the upstream 700 mi2 of the basin. I also have long term precipitation data. I need to know the discharge at the mouth of the basin for the entire period of record (~60 yr, not just a single event). Therefore, I need to find a method that evaluates and includes the contribution of the downstream 300 mi2 ungagged portion of the catchment. Any suggestions? Thank you.
kindly guide me can we use SIMHYD to simulate runoff if we have monthly flow, rainfall, and PET data?
I want to use this model but I have rainfall and runoff data in Excel sheet. Kindly guide me while performing analysis in SIMHYD model which software/technique can be used to convert Excel sheet to the required data format?
Which method do you recommend for estimating monthly and annual runoff data when you have monthly and annual inflows in million gallons, monthly and annual precipitation and temperature data as available data
Is there any open source software for simulating or calculating runoff using Monthly Rainfall, PET and Soil information of an area?
I need to calculate runoff rates of paddy lands
I'm working on a rainfall-runoff analysis of 7 years of observed 30 minute precipitation and streamflow time series data. I have delineated individual storms appropriately using time series algorithms in Excel, however, estimating the center of mass of precipitation and the base time of stream flow response for each storm is complicated.
I wanted to check with the community before I manually calculate those variables from around 700 events x 5 monitoring sites (~3,500 events) one-by-one.
Anyone know of a time series filter algorithm, or software to filter out those hydrograph analysis variables for thousands of storms at once?
I have sound estimates of interstorm duration, rainfall duration, rainfall total, time of rise, time of peak flow, flow at time of rise, and peak flow for each storm if that helps.
1. Small events ( may be rainfall or runoff) usually remains high in number during any rainy season on any natural catchment. We Hydrologists often ignore (except giving AMC consideration) them and remains concentrated/inclined towards peak based approach. Are we need to change our stereotypical approach?
2. I am in great hope that my friends here may suggest me the availability/source of published event based data of rainfall runoff events on multiple catchments/locations, which I am looking for.
The estimation of runoff coefficient essentially requires segregation of measured stream flow into direct runoff and base flow parts. However, many techniques such as graphical and empirical (using digital filters) have been suggested by some researchers. Which technique/s is/are more robust/efficient in estimation of base flow from measured stream flow time series, especially for perennial streams in tropical climate?
Hello everyone,
i am trying to incorporate the reservoirs in the watershed for runoff simulation using ArcSWAT, i have updated the reservoir volume and surface area ranges in the SWAT2012.mdb file database, but when i am trying to update the SWAT input database an error message is coming The microsoft jet database cannot find the input table or query 'resrng' , make sure it exists and spelled correctly, screenshot is attached herewith, i have tried with some solutions provided online, but not able to resolve the same
when i am running model without updating the database different error is coming. It is also attached here (second attachement).
Can anyone know how to resolve this error.
Thanks to all.
Regards
Rajat


Dear Experts
Because of not availability of continuous time series and few rainfall events I would prefer to model the discrete rainfall runoff behavior for semi arid region with different land cover with more the 10 events.
Can you suggest me any good model for doing it.
Is there any valid relationship between these two CGs, and does it reflect any physics in contrast to rainfall runoff conversion process over a natural catchment (either channel phase or overland phase or combined). May be possible some researchers have attempted it in variety of sets of conditions. I am eager to get enriched on this aspect by asking or putting this question before august group here.
I would like to know the stormwater detention capacity for an old growth forest. That is, I am predicting the runoff from a region by aggregating the canopy diffraction, infiltration, evaporation, and natural storage in the rootlet depressions. I already know the values of the other elements.
Estimation of USLE R erosivity index...without having ( I max 30 min)
Thanks
Vegetation is 1st security guard on earth surface to welcome as well as suitably treat the "miss rain drop" having good round shining shape and full of energy & speed traveling freely and approaching earth surface carrying big force with her. Upon striking this guard kills her most of the harmful attributes like velocity, enenrgy, quantum, size, delaying traveling & increasing traveling path etc.
This is the first and foremost initiation of so called hydrology or hydrologic cycle. If vegetation is optimum (even the tiny grass do wonderful job) half of the risk of soil erosion, peak flows is curtailed.
We are dearth of such studies where these important phenomenon are to be studied in real ground conditions. We all like and want to do so and we all understand its importance too.
Only thing preventing us to do so is ....in my opinion a simplistic suitable portable set of system, equipment, or other means where we can take it in field and apply desired kind of artificial rains ( to be produced in close matching with prevailing natural rains) and generating data bank from enormous kind of vegetation and their mix for variety of combinations.
People have tried many innovative ways to attack this vital research problem, but most of the efforts remained in piece meal kind or just for the sake of some narrow or local targets with limited applicability in bigger or larger domain.
We need to think seriously on it..under the present modern age where ''sensor'' can sense any thing...how to attack on this simple but vital research problem of hydrology in a simple but accurate manner...I like to invite expert views and supportive stuff if my friends can offer..
thanks
For ungauged catchments simulation of runoff hydrographs is a big challenge. Often the only available input parameter in such situation remains daily rainfall values i.e. 24 hour rainfall depth in mm. Applying vital hydrological concept of ' UNIT HYDROGRAPH ' for runoff simulation at finer time scale for such situation, is a focus of this question.
Hello
I am working with monthly rainfall data. I want to see the dry age by using this monthly data. I want to compute dry spell and wet spell to interpret the monthly rainfall values obtained from my model. Kindly suggest me some ideas
Regards
Can I it without using a rainfall runoff model?
Which software want to use?
Please help me.
Thanks
how exactly is the procedure to calculate the surface runoff volume from scs curve method for the catchment area for about 4 hectares? Is daily rainfall data sufficient to estimate the runoff volume.
Since decades we are working on this aspect with plethora of models, modelers and projects at global scale. Still unit hydrograph, SCS CN and other synthetic means are appearing good enough or atleast base tools/methods. Reason is lack of real field data & commitment at micro scale. Every researcher prefer to work on a table placed in AC room and conducting experimental or other efforts in numerical form with end target of a publication in high impact journal. This weakness of micro level real data and real exposures to ground conditions, and a fear of loosing time & diluted research publication , keep away most researcher away from this challenging difficult task. This is the probable reason in my way of thinking , why even the best rainfall-runoff models are giving equally bad answers/simulations what we get from simpler model, but here it is at higher costs. Researchers are shifting their attention towards high tech water balance water budgeting kind of phenomenon excluding runoff overland component and getting more concentrated on remotely estimated other hydro logical constituents like transpiration evapotranspiration moisture that too via setelite remote or sensors. Some time calling rainfall runoff modeling as ' gone era of hydrological research' I personally feel disappointed with such kind of views. As on day, I am confident enough that even we are not in a position to accurately define or parametrise the loss function in a rainfall runoff modeling and choose its value in very arbitrary manner, what to say about runoff prediction capabilities. Jumping towards a comfort zone just to be concentrated on publication and leaving aside understanding real ground schenerios is what I consider very much worrying situation what I guess/realize.
I have just one station in the outlet and have monthly rainfall too.
I am estimating groundwater balance and need an uncertainty associated with NRCS-CN method, a general value.
I need to know about this model and the way it calculates rainfall-runoff
I have calculated surface runoff volume over the catchment (2000 Km2) under antecedent moisture condition –III (AMC-III). In this procedure I have used appropriate prerequisite input data by SCS-CN model such as Soil type, 7-day daily point rainfall extrapolated using Thiessen polygon and land use/cover in GIS environment. I have calculated total volume daily basis and 7-days cumulative over the catchment. I have also observed daily discharge recorded at catchment outlet, now please tell me how modeled volume can be relate with the observed daily discharge or other way to validate it.
I'm looking for the cheapest way that we can make durable throughfall collectors and stemflow spiral collars for a rainfall interception and partitioning study that will last for around 7 months. Specific kinds of materials and where they can be found will be really useful. The plot where we will conduct our study will likely include (but not exclusively) the following tree species:
(Gmelina arborea Roxb.),
Auriculiformis (Acacia auriculiformis A. Cunn. Ex. Berth.),
Mangium (A. mangium Willd.),
Mahogany (Swietenia macrophylla King), Narra (Pterocarpus indicus Willd.),
Ipil-ipil (Laucaena leucocephala De Wit)
I am undertaking a research on "Rainfall runoff modelling using Hec-HMS"