---
title: How to compute irregular pond stage storage  relationship according to MSMA?
description: "Authority may request/inquire detailed breakdown on how MiTS software gets the ‘provided pond storage volume’. Calculation on the storage volume is based on the**double-end area. ** ***“The storage volume for natural ponds in irregular terrain is usually developed for detention pond…"
url: "https://mes100.com/docs/how-to-compute-irregular-pond-stage-storage-relationship-according-to-msma/"
updated: "2022-11-02"
category: Exposition / MSMA
tags:
  - Pond
---

# How to compute irregular pond stage storage  relationship according to MSMA?

Authority may request/inquire detailed breakdown on how MiTS software gets the ‘provided pond storage volume’. Calculation on the storage volume is based on the**double-end area. **

***“The storage volume for natural ponds in irregular terrain is usually developed for detention pond using a topographic map and the double-end area***.”(MSMA 2nd Edition, 7.5.2)

The double-end area formula is expressed as:

![](https://i0.wp.com/mes100.com/wp-content/uploads/2020/03/image1-5.png?resize=206%2C26&ssl=1)

Where, 

V(1,2) = Storage volume between elevation 1 and 2 (m3);

A1 = Surface area at elevation 1 (m2);

A2 = Surface area at elevation 2 (m2); and 

h = Change in elevation between points 1 and 2 (m).

![](https://i0.wp.com/mes100.com/wp-content/uploads/2020/03/image2-6.png?resize=330%2C182&ssl=1)

Let's check with textual report from MiTS;

![](https://i0.wp.com/mes100.com/wp-content/uploads/2020/03/image3-6.png?resize=942%2C457&ssl=1)

Therefore, 

V at 1.5m storage  = [(2540.16 + 2560.36) / 2] * (0.15-0.10) = **127.51 m****3**

Hence, this can be used as guidance on how the calculation is made in MiTS software. 

### *Related*

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I’m the [Benevolent Dictator for Life](https://en.wikipedia.org/wiki/Benevolent_dictator_for_life) for MiTS Software cum Editor of this website. Read more [here](/about-ngu-soon-hui/).

You can also contact me at soonhui@mes100.com